From 31 August to 1 September 2025,the 25th Meeting of the Council of Heads of State of the Shanghai Cooperation Organization(the“Tianjin Summit”)and the“Shanghai Cooperation Organization Plus”Meeting were success...From 31 August to 1 September 2025,the 25th Meeting of the Council of Heads of State of the Shanghai Cooperation Organization(the“Tianjin Summit”)and the“Shanghai Cooperation Organization Plus”Meeting were successfully held in Tianjin,China.This was the fifth SCO summit hosted by China and the largest summit since the organization’s founding 24 years ago.The Summit produced fruitful outcomes that injected powerful momentum into the SCO’s future development and signaled that the SCO has entered a new stage of high-quality development.展开更多
[Objectives]To assess the carbon sink capacity in seawater suspension cage aquaculture of shellfish in Tianjin from 2015 to 2022.[Methods]The carbon sink capacity of different shellfish species was evaluated using bot...[Objectives]To assess the carbon sink capacity in seawater suspension cage aquaculture of shellfish in Tianjin from 2015 to 2022.[Methods]The carbon sink capacity of different shellfish species was evaluated using both physical and value assessment methods.[Results]The shellfish cultivated in seawater suspension cages in Tianjin exhibited a significant capacity for carbon sinks.The amounts of carbon removed by suspension cage aquaculture of Rapana venosa,Crassostrea gigas,Scapharca subcrenata,Scapharca broughtonii and Argopectens irradias were 448.297,403.398,89.463,40.657,and 106.719 t,respectively.Furthermore,the total volume of shellfish cultivated in seawater exhibited a consistent upward trend over time,correlating with an annual increase in the amount of carbon removed.Among the shellfish cultivated in seawater suspension cages,the order of carbon sink capacity was as follows:C.gigas>R.venosa>A.irradias>S.subcrenata and S.broughtonii.In terms of the carbon sink capacity of soft tissues,the ranking was as follows:A.irradias>R.venosa>C.gigas>S.subcrenata and S.broughtonii.The structural and yield factors associated with seawater suspension cage aquaculture of shellfish significantly influenced the enhancement of the total carbon sink of cultivated shellfish.Notably,structural factors had a greater impact on the increase in the carbon sink of cultivated shellfish compared to total yield factors.[Conclusions]The findings will serve as a reference for enhancing the carbon sink potential of fisheries and achieving sustainable development in seawater aquaculture in Tianjin.展开更多
This study examines the role of village regulations within China’s Litigation Source Governance(LSG)framework,specifically analyzing Tianjin Municipality’s 2023 Model Village Regulations.Employing legal analysis and...This study examines the role of village regulations within China’s Litigation Source Governance(LSG)framework,specifically analyzing Tianjin Municipality’s 2023 Model Village Regulations.Employing legal analysis and Natural Language Processing(NLP)techniques,the research evaluates the effectiveness,enforceability,and thematic orientation of these regulations in grassroots dispute resolution.Findings reveal a pronounced reliance on moral governance provisions,limited judicial recognition,and significant implementation challenges due to the predominance of non-binding(soft)clauses.The study recommends enhancing judicial recognition through formal confirmation mechanisms,increasing legally binding clauses,and integrating village-level governance more closely with formal judicial processes.This approach not only strengthens local governance but also provides valuable insights for nationwide replication,supporting broader goals of rural stability and governance modernization.展开更多
On May 21st,the launch ceremony of the 2025 Textile and Clothing"Optimization of Supply and Upgrade"event was held in Gaoyang,Hebei Province.The theme of the event is to promote the coordinated development a...On May 21st,the launch ceremony of the 2025 Textile and Clothing"Optimization of Supply and Upgrade"event was held in Gaoyang,Hebei Province.The theme of the event is to promote the coordinated development and supply-demand docking of the textile and clothing industry in the Beijing–Tianjin–Hebei Region.Representatives from the textile and clothing industries gathered in Gaoyang to discuss the coordinated development of regional industries.The Ministry of Industry and Information Technology,Industry Associations,and leaders of the three local governments jointly announced the official launch of the national industrial upgrading action.展开更多
In order to clarify the mitochondrial bar code sequence and taxonomic information of common goby fish in Tianjin coastal marine areas,seven species of goby fish were collected from Tianjin coastal marine areas,identif...In order to clarify the mitochondrial bar code sequence and taxonomic information of common goby fish in Tianjin coastal marine areas,seven species of goby fish were collected from Tianjin coastal marine areas,identified by morphology,and DNA was extracted for amplification and sequencing of mitochondrial COI gene fragments.Phylogenetic analysis and molecular identification software MEGA were used to analyze the sequence characteristics and molecular classification of COI gene fragments of 12 common goby species in Tianjin coastal marine areas.Seven COI gene fragments of Goby were amplified and sequenced,the average GC content was lower than AT content,the base had a bias in the codon position distribution,and the highest GC content was the second base,which was similar to the COI gene base of many fishes.The codon base variation rate was 19.4%,and the ratio of transitions to transversions was 1.3.Phylogenetic distance analysis and phylogenetic tree analysis clarified the phylotaxonomic and evolutionary relationships of 12 major goby species in Tianjin coastal marine areas.Genetic distance indicates that Amblychaeturichthys hexanema and Synechogobius ommaturus are the same species.The high codon variation rate of codon encoding gene in Goby may be related to its good environmental adaptability.展开更多
Coastal wetlands are crucial for the‘blue carbon sink’,significantly contributing to regulating climate change.This study util-ized 160 soil samples,35 remote sensing features,and 5 geo-climatic data to accurately e...Coastal wetlands are crucial for the‘blue carbon sink’,significantly contributing to regulating climate change.This study util-ized 160 soil samples,35 remote sensing features,and 5 geo-climatic data to accurately estimate the soil organic carbon stocks(SOCS)in the coastal wetlands of Tianjin and Hebei,China.To reduce data redundancy,simplify model complexity,and improve model inter-pretability,Pearson correlation analysis(PsCA),Boruta,and recursive feature elimination(RFE)were employed to optimize features.Combined with the optimized features,the soil organic carbon density(SOCD)prediction model was constructed by using multivariate adaptive regression splines(MARS),extreme gradient boosting(XGBoost),and random forest(RF)algorithms and applied to predict the spatial distribution of SOCD and estimate the SOCS of different wetland types in 2020.The results show that:1)different feature combinations have a significant influence on the model performance.Better prediction performance was attained by building a model using RFE-based feature combinations.RF has the best prediction accuracy(R^(2)=0.587,RMSE=0.798 kg/m^(2),MAE=0.660 kg/m^(2)).2)Optical features are more important than radar and geo-climatic features in the MARS,XGBoost,and RF algorithms.3)The size of SOCS is related to SOCD and the area of each wetland type,aquaculture pond has the highest SOCS,followed by marsh,salt pan,mud-flat,and sand shore.展开更多
The monthly variation,temporal-spatial distribution,transportation characteristics of vapour field at middle and lower atmosphere and their effects on drought in Beijing,Tianjin and Hebei districts were studied,which ...The monthly variation,temporal-spatial distribution,transportation characteristics of vapour field at middle and lower atmosphere and their effects on drought in Beijing,Tianjin and Hebei districts were studied,which have a guiding significance on predicting climate and arranging agricultural production in the district.展开更多
[Objective] The aim was to research macrobenthos community structure and its relations with environmental factors in three reservoirs. [Method] Benthic diversity and water quality of Yuqiao Reservoir, Beidagang Reserv...[Objective] The aim was to research macrobenthos community structure and its relations with environmental factors in three reservoirs. [Method] Benthic diversity and water quality of Yuqiao Reservoir, Beidagang Reservoir and Er- wangzhuang Reservoir were investigated in May, July and September 2011, respec- tively. []Result] Of all the 14 sampling sites, 22 species of macroinvertebrates were collected, totally, which included 6 species of aquatic insects, 7 species of Mollusca, 2 species of Crustacean, 7 species of Oligochaeta. The species of macroinverte- brates during May, July and September in Yuqiao reservoir were 11, 8 and 10, respectively. The dominant species were Chironomus sinicus, and Monopylephorus limosus. The average density and biomass of the macrobenthos were 132.43 ind./m2 and 50.09 g/m2. Yuqiao reservoir was mostly at status of premediate polluted, according to the Margalef index, Shannon index and Pielou index. The species of during May, July and September in Beidagang reservoir were 5 5 and 5, respectively. The dominant species were Chironomus sinicus, Penaeus vannamei. The average density and biomass of the macrobenthos were 218 ind./m2 and 2.70 g/m2. Beidagang reservoir was mostly at status of heavy polluted, accord- ing to the Margalef index, Shannon-wiener index, Pielou index. The species of during May, July and September in Erwangzhuang reservoir were 3, 5 and 5, respectively. The dominant species were Monopylephorus limosus, Chi- ronomus sinicus. The average density and biomass of the macrobenthos were 104 ind/m2 and 0.20 g/m2. Erwangzhuang reservoir was mostly at status of intermediate polluted, according to the Margalef index, Shannon index, Pielou index. The density of zoobenthos in Yuqiao Reservoir was positively significantly correlated with TP （P〉 0.05）, negatively correlated with NH4＋-N （P〉0.05）, positively correlated with COD （P〈 0.01）, not significantly correlated with other environment factors （P〉0.05）. There was no significant correlation between biomass of zoobenthos and environment factors. The density of zoobenthos in Beidagang Reservoir with NH4＋-N was positively signif- icantly correlated （P〈0.05）, not significantly correlated with other aquatic environment factors （P〉0.05）. There was no significant correlation between biomass of zoobenthos and environment factors. The density of zoobenthos in Erwangzhuang Reser- voir with NO3-N was positively significantly correlated （P〈0.05）, not significant cor- related with other aquatic environment factors （F〉0.05）. The biomass of zoobenthos in Erwangzhuang Reservoir with NH4＋-N was positively significantly correlated （P〈 0.05）, not significant correlated with other aquatic environment factors （P〉0.05）. [Conclusion] It is indicated that this three reservoirs were all eutrophied and polluted, and the eurephication extent change of water in three reservoirs is as follows： Beidagang reservoir〉Erwangzhuang reservoir〉Yuqiao reservoir.展开更多
Based on IKONOS satellite image in August of 2008,and by using GIS technique and spatial pattern analysis software FRAGSTATS,the paper analyzed landscape pattern of urban green space in Tianjin City from the aspects o...Based on IKONOS satellite image in August of 2008,and by using GIS technique and spatial pattern analysis software FRAGSTATS,the paper analyzed landscape pattern of urban green space in Tianjin City from the aspects of patch composition and level of category and landscape.The result showed that there were manymin-sized patches in Tianjin City while large patches occupied a large proportion of the total area of green space.Green spaces were unbalanced in distribution and unreasonable in structure.It suggested adjusting the structure of urban green space,reducing the degree of landscape fragmentation,strengthening the construction of large and mid-sized green patches,so as to improve ecological function of green space.展开更多
Taking the downtown area of Tianjin City and Beichen District,Xiqing District,Jinnan District and Dongli District in its neighborhood as the study area,TM remote sensing images(with a resolution ratio of 30 m)of 1993 ...Taking the downtown area of Tianjin City and Beichen District,Xiqing District,Jinnan District and Dongli District in its neighborhood as the study area,TM remote sensing images(with a resolution ratio of 30 m)of 1993 and 2001 were utilized to analyze landscape structures and evolution characteristics of the study area by calculating its landscape pattern indexes with the help of ArcGIS9.3.The results showed that:A.Ratios of landscape components changed greatly,area ratio of each landscape component varied in different degrees.Area of farmland decreased from 32.7% to 29.2%;area of green spaces decreased from 27.4% to 20.4%;water area decreased from 26.1% to 23.7%;construction land area increased from 13.8% to 26.8%,and replaced the dominant status of farmland.B.There were 99 366 landscape patches in the study area by 2001,which was almost twice as much as 52 832 landscape patches in 1993.C.Urbanization and increasing human interventions led to the increase of landscape diversity indexes,and the aggravated fragmentation.Through analyzing dynamic changes of urban landscape structures in Tianjin City,evolution trend of the structural characteristics of urban spaces and its factors can be better understood,city pattern and land use properly planned,benign development of economy,society and eco-environment realized.展开更多
[Objective] The aim was to discuss the spatial pattern changes of land use in Tianjin new coastal area based on fractal dimensions.[Method] By dint of remote and geographic information system technology to obtain the ...[Objective] The aim was to discuss the spatial pattern changes of land use in Tianjin new coastal area based on fractal dimensions.[Method] By dint of remote and geographic information system technology to obtain the data of urban land use in new coastal area from 1993 to 2008,the boundary dimension,radius dimension and information dimension of each land use type were calculated based on fractal dimension.In addition,the revealed land use spatial dimension changes characteristics were analyzed.[Result] The spatial distribution of each land use type in new costal area had distinct fractal characteristics.And,the amount and changes of three types of dimension values effectively revealed the changes of complicatedness,centeredness and evenness of spatial pattern of land use in the study area.The boundary dimension of unused land and salty earth increased incessantly,which suggested its increasing complicatedness.The boundary of the port and wharf and shoal land was getting simpler.The radius dimension of the cultivated land was larger than 2,which suggested that its area spread from center to the surroundings;the one in salty land and waters distributed evenly within different radius space to the center of the city;the one in other land use types reduced gradually from center to the surroundings.The information dimension value in the woodland and orchard land,unused land and shoal land was small,and was in obvious concentrated distribution;the spatial distribution of cultivated and salty land concentrated in the outside area;the construction area in the port and wharf spread gradually on the basis of original state;the spatial distribution of waters and residents and mines were even.[Conclusion] Applying fractal dimensions to the study of spatial pattern changes of urban land use can make up for some disadvantages in classical urban spatial pattern quantitative research,which has favorable practical value.展开更多
Through the survey of plant landscapes on eight representative squares in Tianjin City,the paper had pointed out that plant landscapes on Tianjin squares were improper in terms of plants richness,cultivation layer and...Through the survey of plant landscapes on eight representative squares in Tianjin City,the paper had pointed out that plant landscapes on Tianjin squares were improper in terms of plants richness,cultivation layer and color change.It had suggested selecting regional characteristic tree species,applying salt-tolerant plants,emphasizing the diversity of plants species,highlighting the application of towering arbors,stressing the use of color-leaved plants,and creating abundant plant communities,so as to provide citizens with a more practical and ornamental square landscape environment through improving plant landscapes on squares in Tianjin City.展开更多
Based on tidal data statistical analysis for 20 years of Tanggu Marine Environmental Monitoring Station from 1991 to 2010, we concluded that an average of nearly 10 days of 100 cm above water increase took place at Ti...Based on tidal data statistical analysis for 20 years of Tanggu Marine Environmental Monitoring Station from 1991 to 2010, we concluded that an average of nearly 10 days of 100 cm above water increase took place at Tianjin coast every year. The maximum high tide and average tide of Tianjin coast occurred in summer and autumn, and the maximum water increase also occurred in summer and autumn. Days with water increase more than 100 cm mostly occurred in spring, autumn and winter. Then we summarized the causes of coastal storm surge disaster in Tianjin based on astronomical tide factors, meteorological factors, sea level rise, land subsidence, and geographic factors, et al. Finally, we proposed storm surge disaster prevention measures.展开更多
文摘From 31 August to 1 September 2025,the 25th Meeting of the Council of Heads of State of the Shanghai Cooperation Organization(the“Tianjin Summit”)and the“Shanghai Cooperation Organization Plus”Meeting were successfully held in Tianjin,China.This was the fifth SCO summit hosted by China and the largest summit since the organization’s founding 24 years ago.The Summit produced fruitful outcomes that injected powerful momentum into the SCO’s future development and signaled that the SCO has entered a new stage of high-quality development.
基金Supported by Science and Technology Commissioner Project of Tianjin Science and Technology Bureau(22ZYCGSN00630).
文摘[Objectives]To assess the carbon sink capacity in seawater suspension cage aquaculture of shellfish in Tianjin from 2015 to 2022.[Methods]The carbon sink capacity of different shellfish species was evaluated using both physical and value assessment methods.[Results]The shellfish cultivated in seawater suspension cages in Tianjin exhibited a significant capacity for carbon sinks.The amounts of carbon removed by suspension cage aquaculture of Rapana venosa,Crassostrea gigas,Scapharca subcrenata,Scapharca broughtonii and Argopectens irradias were 448.297,403.398,89.463,40.657,and 106.719 t,respectively.Furthermore,the total volume of shellfish cultivated in seawater exhibited a consistent upward trend over time,correlating with an annual increase in the amount of carbon removed.Among the shellfish cultivated in seawater suspension cages,the order of carbon sink capacity was as follows:C.gigas>R.venosa>A.irradias>S.subcrenata and S.broughtonii.In terms of the carbon sink capacity of soft tissues,the ranking was as follows:A.irradias>R.venosa>C.gigas>S.subcrenata and S.broughtonii.The structural and yield factors associated with seawater suspension cage aquaculture of shellfish significantly influenced the enhancement of the total carbon sink of cultivated shellfish.Notably,structural factors had a greater impact on the increase in the carbon sink of cultivated shellfish compared to total yield factors.[Conclusions]The findings will serve as a reference for enhancing the carbon sink potential of fisheries and achieving sustainable development in seawater aquaculture in Tianjin.
基金Tianjin Education Commission Research Program,Humanities and Social Sciences,(Project No.:2022SK064)Innovation Training Program at Tianjin Normal University in 2024,“Research on the Function of Rural Norms in Source Governance of Disputes from the Perspective of Rural Revitalization”(Project No.:202410065027)。
文摘This study examines the role of village regulations within China’s Litigation Source Governance(LSG)framework,specifically analyzing Tianjin Municipality’s 2023 Model Village Regulations.Employing legal analysis and Natural Language Processing(NLP)techniques,the research evaluates the effectiveness,enforceability,and thematic orientation of these regulations in grassroots dispute resolution.Findings reveal a pronounced reliance on moral governance provisions,limited judicial recognition,and significant implementation challenges due to the predominance of non-binding(soft)clauses.The study recommends enhancing judicial recognition through formal confirmation mechanisms,increasing legally binding clauses,and integrating village-level governance more closely with formal judicial processes.This approach not only strengthens local governance but also provides valuable insights for nationwide replication,supporting broader goals of rural stability and governance modernization.
文摘On May 21st,the launch ceremony of the 2025 Textile and Clothing"Optimization of Supply and Upgrade"event was held in Gaoyang,Hebei Province.The theme of the event is to promote the coordinated development and supply-demand docking of the textile and clothing industry in the Beijing–Tianjin–Hebei Region.Representatives from the textile and clothing industries gathered in Gaoyang to discuss the coordinated development of regional industries.The Ministry of Industry and Information Technology,Industry Associations,and leaders of the three local governments jointly announced the official launch of the national industrial upgrading action.
基金supported by the National Key R&D Plan(2019YFD0902102 and 2019YFE01223000)Innovation Team Project of Marine Aquaculture Modern Agricultural Industry System in Tianjin City(ITTMRS2021005).
文摘In order to clarify the mitochondrial bar code sequence and taxonomic information of common goby fish in Tianjin coastal marine areas,seven species of goby fish were collected from Tianjin coastal marine areas,identified by morphology,and DNA was extracted for amplification and sequencing of mitochondrial COI gene fragments.Phylogenetic analysis and molecular identification software MEGA were used to analyze the sequence characteristics and molecular classification of COI gene fragments of 12 common goby species in Tianjin coastal marine areas.Seven COI gene fragments of Goby were amplified and sequenced,the average GC content was lower than AT content,the base had a bias in the codon position distribution,and the highest GC content was the second base,which was similar to the COI gene base of many fishes.The codon base variation rate was 19.4%,and the ratio of transitions to transversions was 1.3.Phylogenetic distance analysis and phylogenetic tree analysis clarified the phylotaxonomic and evolutionary relationships of 12 major goby species in Tianjin coastal marine areas.Genetic distance indicates that Amblychaeturichthys hexanema and Synechogobius ommaturus are the same species.The high codon variation rate of codon encoding gene in Goby may be related to its good environmental adaptability.
基金Under the auspices of National Natural Science Foundation of China(No.42101393,41901375,52274166)Hebei Natural Science Foundation(No.D2022209005,D2023209008)Central Guided Local Science and Technology Development Fund Project of Hebei Province(No.236Z3305G,246Z4201G)Key Research and Development Program of Science and Technology Plan of Tangshan,China(No.22150221J)。
文摘Coastal wetlands are crucial for the‘blue carbon sink’,significantly contributing to regulating climate change.This study util-ized 160 soil samples,35 remote sensing features,and 5 geo-climatic data to accurately estimate the soil organic carbon stocks(SOCS)in the coastal wetlands of Tianjin and Hebei,China.To reduce data redundancy,simplify model complexity,and improve model inter-pretability,Pearson correlation analysis(PsCA),Boruta,and recursive feature elimination(RFE)were employed to optimize features.Combined with the optimized features,the soil organic carbon density(SOCD)prediction model was constructed by using multivariate adaptive regression splines(MARS),extreme gradient boosting(XGBoost),and random forest(RF)algorithms and applied to predict the spatial distribution of SOCD and estimate the SOCS of different wetland types in 2020.The results show that:1)different feature combinations have a significant influence on the model performance.Better prediction performance was attained by building a model using RFE-based feature combinations.RF has the best prediction accuracy(R^(2)=0.587,RMSE=0.798 kg/m^(2),MAE=0.660 kg/m^(2)).2)Optical features are more important than radar and geo-climatic features in the MARS,XGBoost,and RF algorithms.3)The size of SOCS is related to SOCD and the area of each wetland type,aquaculture pond has the highest SOCS,followed by marsh,salt pan,mud-flat,and sand shore.
基金Supported by National Natural Sciences Foundations of China(40875032 and 40875002)Talents Culture Foundations of Beijing City (20051D0200802)~~
文摘The monthly variation,temporal-spatial distribution,transportation characteristics of vapour field at middle and lower atmosphere and their effects on drought in Beijing,Tianjin and Hebei districts were studied,which have a guiding significance on predicting climate and arranging agricultural production in the district.
基金Supported by Tianjin Aquatic Species Diveristy Surveying,Monitoring and Evaluation Proejct~~
文摘[Objective] The aim was to research macrobenthos community structure and its relations with environmental factors in three reservoirs. [Method] Benthic diversity and water quality of Yuqiao Reservoir, Beidagang Reservoir and Er- wangzhuang Reservoir were investigated in May, July and September 2011, respec- tively. []Result] Of all the 14 sampling sites, 22 species of macroinvertebrates were collected, totally, which included 6 species of aquatic insects, 7 species of Mollusca, 2 species of Crustacean, 7 species of Oligochaeta. The species of macroinverte- brates during May, July and September in Yuqiao reservoir were 11, 8 and 10, respectively. The dominant species were Chironomus sinicus, and Monopylephorus limosus. The average density and biomass of the macrobenthos were 132.43 ind./m2 and 50.09 g/m2. Yuqiao reservoir was mostly at status of premediate polluted, according to the Margalef index, Shannon index and Pielou index. The species of during May, July and September in Beidagang reservoir were 5 5 and 5, respectively. The dominant species were Chironomus sinicus, Penaeus vannamei. The average density and biomass of the macrobenthos were 218 ind./m2 and 2.70 g/m2. Beidagang reservoir was mostly at status of heavy polluted, accord- ing to the Margalef index, Shannon-wiener index, Pielou index. The species of during May, July and September in Erwangzhuang reservoir were 3, 5 and 5, respectively. The dominant species were Monopylephorus limosus, Chi- ronomus sinicus. The average density and biomass of the macrobenthos were 104 ind/m2 and 0.20 g/m2. Erwangzhuang reservoir was mostly at status of intermediate polluted, according to the Margalef index, Shannon index, Pielou index. The density of zoobenthos in Yuqiao Reservoir was positively significantly correlated with TP （P〉 0.05）, negatively correlated with NH4＋-N （P〉0.05）, positively correlated with COD （P〈 0.01）, not significantly correlated with other environment factors （P〉0.05）. There was no significant correlation between biomass of zoobenthos and environment factors. The density of zoobenthos in Beidagang Reservoir with NH4＋-N was positively signif- icantly correlated （P〈0.05）, not significantly correlated with other aquatic environment factors （P〉0.05）. There was no significant correlation between biomass of zoobenthos and environment factors. The density of zoobenthos in Erwangzhuang Reser- voir with NO3-N was positively significantly correlated （P〈0.05）, not significant cor- related with other aquatic environment factors （F〉0.05）. The biomass of zoobenthos in Erwangzhuang Reservoir with NH4＋-N was positively significantly correlated （P〈 0.05）, not significant correlated with other aquatic environment factors （P〉0.05）. [Conclusion] It is indicated that this three reservoirs were all eutrophied and polluted, and the eurephication extent change of water in three reservoirs is as follows： Beidagang reservoir〉Erwangzhuang reservoir〉Yuqiao reservoir.
基金Supported by Natural Science Foundation of China (41001022)Funds for Talents' Introduction of Tianjin Normal University (5RL077,5RL076)~~
文摘Based on IKONOS satellite image in August of 2008,and by using GIS technique and spatial pattern analysis software FRAGSTATS,the paper analyzed landscape pattern of urban green space in Tianjin City from the aspects of patch composition and level of category and landscape.The result showed that there were manymin-sized patches in Tianjin City while large patches occupied a large proportion of the total area of green space.Green spaces were unbalanced in distribution and unreasonable in structure.It suggested adjusting the structure of urban green space,reducing the degree of landscape fragmentation,strengthening the construction of large and mid-sized green patches,so as to improve ecological function of green space.
基金Supported by The National Natural Science Fund(41001022)Talent Introduction Fund of Tianjin Normal University(5RL076,5RL077)~~
文摘Taking the downtown area of Tianjin City and Beichen District,Xiqing District,Jinnan District and Dongli District in its neighborhood as the study area,TM remote sensing images(with a resolution ratio of 30 m)of 1993 and 2001 were utilized to analyze landscape structures and evolution characteristics of the study area by calculating its landscape pattern indexes with the help of ArcGIS9.3.The results showed that:A.Ratios of landscape components changed greatly,area ratio of each landscape component varied in different degrees.Area of farmland decreased from 32.7% to 29.2%;area of green spaces decreased from 27.4% to 20.4%;water area decreased from 26.1% to 23.7%;construction land area increased from 13.8% to 26.8%,and replaced the dominant status of farmland.B.There were 99 366 landscape patches in the study area by 2001,which was almost twice as much as 52 832 landscape patches in 1993.C.Urbanization and increasing human interventions led to the increase of landscape diversity indexes,and the aggravated fragmentation.Through analyzing dynamic changes of urban landscape structures in Tianjin City,evolution trend of the structural characteristics of urban spaces and its factors can be better understood,city pattern and land use properly planned,benign development of economy,society and eco-environment realized.
基金Supported by National Natural Science Fund Program(40705038)~~
文摘[Objective] The aim was to discuss the spatial pattern changes of land use in Tianjin new coastal area based on fractal dimensions.[Method] By dint of remote and geographic information system technology to obtain the data of urban land use in new coastal area from 1993 to 2008,the boundary dimension,radius dimension and information dimension of each land use type were calculated based on fractal dimension.In addition,the revealed land use spatial dimension changes characteristics were analyzed.[Result] The spatial distribution of each land use type in new costal area had distinct fractal characteristics.And,the amount and changes of three types of dimension values effectively revealed the changes of complicatedness,centeredness and evenness of spatial pattern of land use in the study area.The boundary dimension of unused land and salty earth increased incessantly,which suggested its increasing complicatedness.The boundary of the port and wharf and shoal land was getting simpler.The radius dimension of the cultivated land was larger than 2,which suggested that its area spread from center to the surroundings;the one in salty land and waters distributed evenly within different radius space to the center of the city;the one in other land use types reduced gradually from center to the surroundings.The information dimension value in the woodland and orchard land,unused land and shoal land was small,and was in obvious concentrated distribution;the spatial distribution of cultivated and salty land concentrated in the outside area;the construction area in the port and wharf spread gradually on the basis of original state;the spatial distribution of waters and residents and mines were even.[Conclusion] Applying fractal dimensions to the study of spatial pattern changes of urban land use can make up for some disadvantages in classical urban spatial pattern quantitative research,which has favorable practical value.
基金Supported by Foundation of Tianjin Art Science Planning (C08054)~~
文摘Through the survey of plant landscapes on eight representative squares in Tianjin City,the paper had pointed out that plant landscapes on Tianjin squares were improper in terms of plants richness,cultivation layer and color change.It had suggested selecting regional characteristic tree species,applying salt-tolerant plants,emphasizing the diversity of plants species,highlighting the application of towering arbors,stressing the use of color-leaved plants,and creating abundant plant communities,so as to provide citizens with a more practical and ornamental square landscape environment through improving plant landscapes on squares in Tianjin City.
文摘Based on tidal data statistical analysis for 20 years of Tanggu Marine Environmental Monitoring Station from 1991 to 2010, we concluded that an average of nearly 10 days of 100 cm above water increase took place at Tianjin coast every year. The maximum high tide and average tide of Tianjin coast occurred in summer and autumn, and the maximum water increase also occurred in summer and autumn. Days with water increase more than 100 cm mostly occurred in spring, autumn and winter. Then we summarized the causes of coastal storm surge disaster in Tianjin based on astronomical tide factors, meteorological factors, sea level rise, land subsidence, and geographic factors, et al. Finally, we proposed storm surge disaster prevention measures.
