Aims:Reed(Phragmites australis)is a plant species with a seasonal reproductive cycle;it has a very high biomass in U Minh Thuong National Park,in Vietnam.This study aims to evaluate fresh and dry biomass of the reed a...Aims:Reed(Phragmites australis)is a plant species with a seasonal reproductive cycle;it has a very high biomass in U Minh Thuong National Park,in Vietnam.This study aims to evaluate fresh and dry biomass of the reed and the production of biochar from the plants.The biochar is then used as a bio-organic fertilizer for watermelon cultivation in agriculture.Methods:To achieve these objectives the following experiments were conducted(1)investtigating the fresh and dry biomass of reeds producing biochar using local methods;(2)adsorption with pig urine and chemical fertilizers(nitrogen,phosphorus and potash)to examine the uptake of chemical components into the water environment;(3)mixing biochar with inorganic mineral fertilizers and peat to creat inorganic fertilizer–biochar formulas,followed by an analysis of the chemical compositions of the mixtures;(4)using various biochar-based fertilizers to grow watermelon with local varieties.Results:The results show that reeds produce very high for biomass biochar fertilizer production.Reed biochar can adsorb components of pig urine,such as ammonium,nitrate,nitrogen and phosphorus along with inorganic substances such as nitrogen,phosphorus and potash.Therefore this study proposes the use of this biochar for watermelon cultivation and environment treatment in polluted regions.Conclusions:Biomass and biochar of reed are very high.The biochar can adsorb nitrogen,phosphorus and potash fertilizers.Additionally,biochar can be mixed with peat and inorganic mineral fertilizers for to watermelon cultivation in Mekong Delta.Implications of the research:Forest fires in U Minh Thuong National Park,caused by reed vegetation,occur annually and result in damage to property and human livelihoods.This research not only exploits renewable raw materials but also helps control the risk of forest fires.Originality/Valeu:This study aims to provide methods for controlling forest fires by producing biochar of from reed(Phragmites australis)U Minh Thuong National Park Vietnam.This species thrives and produces a large biomass during the rainy season,supllying dry material that contributes to the intensity of forest fires in the dry season in Vietnam.展开更多
Research conducted in U Minh Thuong National Park to assess carbon storage from fires and water on forest growth and regeneration.In 2003 after forest fire,measures were implemented to promote forest regeneration,affo...Research conducted in U Minh Thuong National Park to assess carbon storage from fires and water on forest growth and regeneration.In 2003 after forest fire,measures were implemented to promote forest regeneration,afforestation,and rainwater storage,aim to prevent future forest fires.Investigating established in 2023 on the thicknesses of(20–40 cm),(40–60 cm),(60–80 cm)of the 500 m2 per plot,with 5 replications,measuring growth and analyzing peat chemistry.Contents include:Assessing changes in peat and carbon reserves Melaleuca forests before and after forest fires;analysis of peat and water chemical properties during seasonal floods,assessing Melaleuca growth,and the relationship between soil chemistry and growth due to higher water levels 20 years after forest fire.The results show a large volume of peat and carbon reserves,accumulated over thousands of years,destroyed by forest fires;lost in large quantities due to frequent flooding,leading to organic matter decomposition.Melaleuca grows slowly and death ratio increases after 20 years.Study also determined soil and water chemistry by seasonal flood;relationship between peat chemical indicators and Melaleuca growth on peat thickness.Results assessed the total peat volume and carbon stocks accumulated over thousands of years of Melaleuca Forest history,the effects of forest fires and water management on growth and chemical relationships,particularly after above-normal water levels were observed for 20 years.Results are research changes in peat.展开更多
Purpose: We aimed to reveal the association between cognitive social capital and sexual awareness among high school students in Ho Chi Minh City, Vietnam, where adolescent premarital sex is considered to be wide-sprea...Purpose: We aimed to reveal the association between cognitive social capital and sexual awareness among high school students in Ho Chi Minh City, Vietnam, where adolescent premarital sex is considered to be wide-spreading as consequence of socioeconomic changes, in comparison to our previous study in Hanoi, 2012. Methods: We conducted a questionnaire-based survey and a cross sectional study in late 2014, with 2051 eleventh graders at three high schools in Ho Chi Minh City. Complete data was received from 1935 respondents (94.3%). We assessed basic attributes, sexual knowledge, sexual awareness, sexual experience of peers, cognitive social capital such as a sense of community belonging, and Rosenberg Self-Esteem score. After the independent t-test and multiple logistic regression analyses on sexual awareness were performed assigning trivalent Rosenberg Self-Esteem score, sexual knowledge, and sexual experience of peers as independent variables (model 1), followed by analysis adjusted for cognitive social capital (model 2). This study was approved by Japanese Red Cross Akita College of Nursing (No. 24-003). Results: Of 1935 respondents, 99.9% were 16 or 17 years old and mostly from nuclear families (71.1%). Of all participants, 45.8% in males and 49.4% in females correctly answered on sexual knowledge, 47.6% of males and 28.3% of females accepted premarital sex, 60.0% of male and 65.0% of females knew peers with sexual intercourse experience, and 78.1% of males and 79.1% of females agreed with a sense of community belonging. When multiple logistic regression analyses performed, in model 1, sexual awareness was significantly associated with Rosenberg Self-Esteem score in female. In model 2, above association disappeared but significant association was found between sexual awareness and cognitive social capital in both sexes OR (95% CI), male 1.39 (1.05 - 1.84), female 1.99 (1.49 - 2.65). Discussion: The conservative traditional culture in both Hanoi and Ho Chi Minh City seems to be similar to the concept of cognitive social capital and it is considered to have influenced sexual awareness of high school students in Hanoi and Ho Chi Minh City, Vietnam. Conclusion: Cognitive social capital is significantly associated with sexual awareness among high school students in urban areas of Vietnam.展开更多
The Xining and the Minhe Basins bordering on each other around Ledu innorthwestern China cover a wide area from the west of Lanzhou in Gansuprovince to the east of Xining in Qinghai province.In these inland basins,Mes...The Xining and the Minhe Basins bordering on each other around Ledu innorthwestern China cover a wide area from the west of Lanzhou in Gansuprovince to the east of Xining in Qinghai province.In these inland basins,Meso-Cenozoic terrestrial deposits about 6000-7000 meters in thicknessand rich in mineral resources,such as coal,oi1 as well as salts,had beenaccumunated,which yield abundant organic remains comprising microfossils,such as nonmarine ostracods,charophytes,spores and pollen and macrofos-si1s including bivalves.gastropods,esthierians,fishes,reptiles and plants.展开更多
HIV/AIDS is still an important public health issue in Vietnam and other developing countries. In Vietnam, Community-based organizations (CBOs) were officially considered as the key partners to approach vulnerable grou...HIV/AIDS is still an important public health issue in Vietnam and other developing countries. In Vietnam, Community-based organizations (CBOs) were officially considered as the key partners to approach vulnerable groups at high risks of HIV infection since 2010. Funds for HIV/AIDS prevention and control are facing difficulties due to rapid reduction by international organizations, while domestic funding has not yet met the demand, especially funding for prevention and communication activities. Our study aimed to assess the fundraising capacity of several CBOs in Ho Chi Minh City, Vietnam and analyze the challenges that they are facing now and in future in their work of HIV/AIDS management for community. The 03 typical and representative CBOs (G3VN, Smile and Strong Ladies) were chosen in our cross-sectional descriptive study. The electronic questionnaire was about fundraising reports over 3 years (2017-2019), organization structure (staff, mission, strategies) and the advantages and disadvantages in fundraising. Funds received over the year increased in total, but unstable in each projects. To have more funds, CBOs must invest time and money to have professional staff in fundraising and writing proposals. To meet requirement and survive, some CBO shifted to social enterprises and faced many difficulties in laws when being treated like profit companies. In Vietnam context, the key challenges which affect the role of funding are including: 1) Legal status;2) Small scale;3) Capacity of fundraising (finding calls, writing competence proposals);4) Fewer funds on HIV/AIDS. In future, we should pay attention in scaling up and building fundraising capacity for CBOs in order to help them in applying for international funds in community projects or even in HIV/AIDS research for CBOs, social enterprises in the context of funds for nation-level phased out of Vietnam.展开更多
Vietnam＇s economy is developing more and more rapidly, people＇s income are increasing, and the living condition is better. Today, consumer are increasingly aware of the quality of products, especially fresh food, bu...Vietnam＇s economy is developing more and more rapidly, people＇s income are increasing, and the living condition is better. Today, consumer are increasingly aware of the quality of products, especially fresh food, but they have a little opportunity to choose the products which satisfy the needs, because they are limited to the product information and product origin. Fresh vegetables are one of the essential foods in the family living. The selection of fresh vegetables is not only to serve the basic needs as eating and drinking, but also to include the need for safety. Currently, consumer demand for fresh vegetable are great, especially when the living standards are becoming higher and people pay more attention to their health, especially for the consumer of Ho Chi Minh City. How fresh is vegetable market in Ho Chi Minh City today like.＇？ What is consumers＇ awareness of fresh vegetable？ What factors impact the fresh vegetable buying behavior of consumers？ Why does the development of fresh vegetable market in Ho Chi Minh City currently face many difficulties？ This study surveys the research, analyzes the factors affecting the economic area formation of fresh vegetable plantation at suburb of rio Chi Minh City.展开更多
Sustainable urban development is becoming the top concern of the nations in making and implementing the development policy systems.Sustainable urban development is a harmonious,effective development process with three...Sustainable urban development is becoming the top concern of the nations in making and implementing the development policy systems.Sustainable urban development is a harmonious,effective development process with three pillars:economic development,social inclusion,and environmental management effectively.Vietnam is a rapidly urbanizing country.This process makes Vietnam’s cities face many major problems and challenges,especially sustainable economic development.Ho Chi Minh City is Vietnam’s largest city.It is the dynamic city with the fastest socio-economic development rate of Vietnam.The development of Ho Chi Minh City plays an important role in the overall development of the whole country.However,in the assessments of the authorities and experts,Ho Chi Minh City is growing slowly and facing many big problems.Based on the analysis of the City’s potentials and advantages as well as the difficulties and challenges of the new development context,this paper recommends groups of solutions for sustainable economic development in Ho Chi Minh City in the next decades.展开更多
Fluvial sedimentation of alluvial facies prevailed during the Late Jurassic in the Minhe Basin. On the basis of the study of sedimentary facies of the Upper Jurassic series, this paper focuses on the river types using...Fluvial sedimentation of alluvial facies prevailed during the Late Jurassic in the Minhe Basin. On the basis of the study of sedimentary facies of the Upper Jurassic series, this paper focuses on the river types using the \!Architecture Element" analysis method proposed by Miall, and calculated all the quantitative parameters to reflect the characteristics of the stream channel geometry and hydrodynamic conditions of paleo\|rivers with the equations of Ethrideg, Schumm et al. Finally, we discussed the characteristics of environmental evolution of paleo\|rivers on the quantitative basis. Our conclusion indicates that the evolution of paleo\|rivers during the Late Jurassic, from early to late, shows such a tendency as alluvial fan river→braid river→alluvial fan river→mid\|sinuosity river→high\| sinuosity river.展开更多
In this study,the spatiotemporal variability of trends in extreme precipitation events in Ho Chi Minh City during the period 1980–2017 was analyzed based on several core extreme precipitation indices(Rx1 day,Rx5 day,...In this study,the spatiotemporal variability of trends in extreme precipitation events in Ho Chi Minh City during the period 1980–2017 was analyzed based on several core extreme precipitation indices(Rx1 day,Rx5 day,CDD,CWD,R20 mm,R25 mm,R95 p,and SDII).The nonparametric Mann–Kendall and Sen’s slope methods were used to compute the statistical strength,stability,and magnitude of trends in annual rainfall,as well as the extreme precipitation indices.We found that 64%of the stations had statistically significant upward trends in yearly rainfall,with high magnitudes frequently observed in the northern and southern regions of the city.For the extreme precipitation indices,only SDII and R25 mm showed dominantly significant trends.Additionally,there were increasing trends in the frequency and duration at the southern and central regions of the city during the study period.Furthermore,El Ni?o-Southern Oscillation and Pacific Decadal Oscillation positively correlated with the duration and negatively correlated with the intensity and frequency of extreme precipitation.Thus,water management plans should be adjusted appropriately to reduce the severe impacts of precipitation extremes on communities and ecosystems.展开更多
Imagine a place where you can enjoy your favorite cup of coffee in the company of dozens of koi fish as they swim through ankledeep water that covers the entire floor.That's Thailand's koi fish café.Remem...Imagine a place where you can enjoy your favorite cup of coffee in the company of dozens of koi fish as they swim through ankledeep water that covers the entire floor.That's Thailand's koi fish café.Remember Amix Coffee,the“flooded café”of Ho Chi Minh City,where hundreds of decorative fish of all shapes and sizes lived on the watercovered floor as customers walked among them?展开更多
文摘Aims:Reed(Phragmites australis)is a plant species with a seasonal reproductive cycle;it has a very high biomass in U Minh Thuong National Park,in Vietnam.This study aims to evaluate fresh and dry biomass of the reed and the production of biochar from the plants.The biochar is then used as a bio-organic fertilizer for watermelon cultivation in agriculture.Methods:To achieve these objectives the following experiments were conducted(1)investtigating the fresh and dry biomass of reeds producing biochar using local methods;(2)adsorption with pig urine and chemical fertilizers(nitrogen,phosphorus and potash)to examine the uptake of chemical components into the water environment;(3)mixing biochar with inorganic mineral fertilizers and peat to creat inorganic fertilizer–biochar formulas,followed by an analysis of the chemical compositions of the mixtures;(4)using various biochar-based fertilizers to grow watermelon with local varieties.Results:The results show that reeds produce very high for biomass biochar fertilizer production.Reed biochar can adsorb components of pig urine,such as ammonium,nitrate,nitrogen and phosphorus along with inorganic substances such as nitrogen,phosphorus and potash.Therefore this study proposes the use of this biochar for watermelon cultivation and environment treatment in polluted regions.Conclusions:Biomass and biochar of reed are very high.The biochar can adsorb nitrogen,phosphorus and potash fertilizers.Additionally,biochar can be mixed with peat and inorganic mineral fertilizers for to watermelon cultivation in Mekong Delta.Implications of the research:Forest fires in U Minh Thuong National Park,caused by reed vegetation,occur annually and result in damage to property and human livelihoods.This research not only exploits renewable raw materials but also helps control the risk of forest fires.Originality/Valeu:This study aims to provide methods for controlling forest fires by producing biochar of from reed(Phragmites australis)U Minh Thuong National Park Vietnam.This species thrives and produces a large biomass during the rainy season,supllying dry material that contributes to the intensity of forest fires in the dry season in Vietnam.
基金Department of Science,Technology and Environment,Ministry of Education and Training Vietnam has supported project KGU1-B2024(2024–2025)the Faculty of Natural resources and Environment of Kien Giang University+1 种基金the U Minh Thuong National Park of Vietnamthe Southern Forestry Institute of Vietnam.
文摘Research conducted in U Minh Thuong National Park to assess carbon storage from fires and water on forest growth and regeneration.In 2003 after forest fire,measures were implemented to promote forest regeneration,afforestation,and rainwater storage,aim to prevent future forest fires.Investigating established in 2023 on the thicknesses of(20–40 cm),(40–60 cm),(60–80 cm)of the 500 m2 per plot,with 5 replications,measuring growth and analyzing peat chemistry.Contents include:Assessing changes in peat and carbon reserves Melaleuca forests before and after forest fires;analysis of peat and water chemical properties during seasonal floods,assessing Melaleuca growth,and the relationship between soil chemistry and growth due to higher water levels 20 years after forest fire.The results show a large volume of peat and carbon reserves,accumulated over thousands of years,destroyed by forest fires;lost in large quantities due to frequent flooding,leading to organic matter decomposition.Melaleuca grows slowly and death ratio increases after 20 years.Study also determined soil and water chemistry by seasonal flood;relationship between peat chemical indicators and Melaleuca growth on peat thickness.Results assessed the total peat volume and carbon stocks accumulated over thousands of years of Melaleuca Forest history,the effects of forest fires and water management on growth and chemical relationships,particularly after above-normal water levels were observed for 20 years.Results are research changes in peat.
文摘Purpose: We aimed to reveal the association between cognitive social capital and sexual awareness among high school students in Ho Chi Minh City, Vietnam, where adolescent premarital sex is considered to be wide-spreading as consequence of socioeconomic changes, in comparison to our previous study in Hanoi, 2012. Methods: We conducted a questionnaire-based survey and a cross sectional study in late 2014, with 2051 eleventh graders at three high schools in Ho Chi Minh City. Complete data was received from 1935 respondents (94.3%). We assessed basic attributes, sexual knowledge, sexual awareness, sexual experience of peers, cognitive social capital such as a sense of community belonging, and Rosenberg Self-Esteem score. After the independent t-test and multiple logistic regression analyses on sexual awareness were performed assigning trivalent Rosenberg Self-Esteem score, sexual knowledge, and sexual experience of peers as independent variables (model 1), followed by analysis adjusted for cognitive social capital (model 2). This study was approved by Japanese Red Cross Akita College of Nursing (No. 24-003). Results: Of 1935 respondents, 99.9% were 16 or 17 years old and mostly from nuclear families (71.1%). Of all participants, 45.8% in males and 49.4% in females correctly answered on sexual knowledge, 47.6% of males and 28.3% of females accepted premarital sex, 60.0% of male and 65.0% of females knew peers with sexual intercourse experience, and 78.1% of males and 79.1% of females agreed with a sense of community belonging. When multiple logistic regression analyses performed, in model 1, sexual awareness was significantly associated with Rosenberg Self-Esteem score in female. In model 2, above association disappeared but significant association was found between sexual awareness and cognitive social capital in both sexes OR (95% CI), male 1.39 (1.05 - 1.84), female 1.99 (1.49 - 2.65). Discussion: The conservative traditional culture in both Hanoi and Ho Chi Minh City seems to be similar to the concept of cognitive social capital and it is considered to have influenced sexual awareness of high school students in Hanoi and Ho Chi Minh City, Vietnam. Conclusion: Cognitive social capital is significantly associated with sexual awareness among high school students in urban areas of Vietnam.
文摘The Xining and the Minhe Basins bordering on each other around Ledu innorthwestern China cover a wide area from the west of Lanzhou in Gansuprovince to the east of Xining in Qinghai province.In these inland basins,Meso-Cenozoic terrestrial deposits about 6000-7000 meters in thicknessand rich in mineral resources,such as coal,oi1 as well as salts,had beenaccumunated,which yield abundant organic remains comprising microfossils,such as nonmarine ostracods,charophytes,spores and pollen and macrofos-si1s including bivalves.gastropods,esthierians,fishes,reptiles and plants.
文摘HIV/AIDS is still an important public health issue in Vietnam and other developing countries. In Vietnam, Community-based organizations (CBOs) were officially considered as the key partners to approach vulnerable groups at high risks of HIV infection since 2010. Funds for HIV/AIDS prevention and control are facing difficulties due to rapid reduction by international organizations, while domestic funding has not yet met the demand, especially funding for prevention and communication activities. Our study aimed to assess the fundraising capacity of several CBOs in Ho Chi Minh City, Vietnam and analyze the challenges that they are facing now and in future in their work of HIV/AIDS management for community. The 03 typical and representative CBOs (G3VN, Smile and Strong Ladies) were chosen in our cross-sectional descriptive study. The electronic questionnaire was about fundraising reports over 3 years (2017-2019), organization structure (staff, mission, strategies) and the advantages and disadvantages in fundraising. Funds received over the year increased in total, but unstable in each projects. To have more funds, CBOs must invest time and money to have professional staff in fundraising and writing proposals. To meet requirement and survive, some CBO shifted to social enterprises and faced many difficulties in laws when being treated like profit companies. In Vietnam context, the key challenges which affect the role of funding are including: 1) Legal status;2) Small scale;3) Capacity of fundraising (finding calls, writing competence proposals);4) Fewer funds on HIV/AIDS. In future, we should pay attention in scaling up and building fundraising capacity for CBOs in order to help them in applying for international funds in community projects or even in HIV/AIDS research for CBOs, social enterprises in the context of funds for nation-level phased out of Vietnam.
文摘Vietnam＇s economy is developing more and more rapidly, people＇s income are increasing, and the living condition is better. Today, consumer are increasingly aware of the quality of products, especially fresh food, but they have a little opportunity to choose the products which satisfy the needs, because they are limited to the product information and product origin. Fresh vegetables are one of the essential foods in the family living. The selection of fresh vegetables is not only to serve the basic needs as eating and drinking, but also to include the need for safety. Currently, consumer demand for fresh vegetable are great, especially when the living standards are becoming higher and people pay more attention to their health, especially for the consumer of Ho Chi Minh City. How fresh is vegetable market in Ho Chi Minh City today like.＇？ What is consumers＇ awareness of fresh vegetable？ What factors impact the fresh vegetable buying behavior of consumers？ Why does the development of fresh vegetable market in Ho Chi Minh City currently face many difficulties？ This study surveys the research, analyzes the factors affecting the economic area formation of fresh vegetable plantation at suburb of rio Chi Minh City.
文摘Sustainable urban development is becoming the top concern of the nations in making and implementing the development policy systems.Sustainable urban development is a harmonious,effective development process with three pillars:economic development,social inclusion,and environmental management effectively.Vietnam is a rapidly urbanizing country.This process makes Vietnam’s cities face many major problems and challenges,especially sustainable economic development.Ho Chi Minh City is Vietnam’s largest city.It is the dynamic city with the fastest socio-economic development rate of Vietnam.The development of Ho Chi Minh City plays an important role in the overall development of the whole country.However,in the assessments of the authorities and experts,Ho Chi Minh City is growing slowly and facing many big problems.Based on the analysis of the City’s potentials and advantages as well as the difficulties and challenges of the new development context,this paper recommends groups of solutions for sustainable economic development in Ho Chi Minh City in the next decades.
文摘Fluvial sedimentation of alluvial facies prevailed during the Late Jurassic in the Minhe Basin. On the basis of the study of sedimentary facies of the Upper Jurassic series, this paper focuses on the river types using the \!Architecture Element" analysis method proposed by Miall, and calculated all the quantitative parameters to reflect the characteristics of the stream channel geometry and hydrodynamic conditions of paleo\|rivers with the equations of Ethrideg, Schumm et al. Finally, we discussed the characteristics of environmental evolution of paleo\|rivers on the quantitative basis. Our conclusion indicates that the evolution of paleo\|rivers during the Late Jurassic, from early to late, shows such a tendency as alluvial fan river→braid river→alluvial fan river→mid\|sinuosity river→high\| sinuosity river.
基金supported by the Science and Technology Incubator Youth Program,managed by the Center for Science and Technology Development,Ho Chi Minh Communist Youth Union(Contract Number 17/2018/HD-KHCN-VƯ)partly funded by Ho Chi Minh City’s Department of Science and Technology(HCMC-DOST)Institute for Computational Science and Technology(ICST)(Grant Number 05/2019/HD-KHCNTT)
文摘In this study,the spatiotemporal variability of trends in extreme precipitation events in Ho Chi Minh City during the period 1980–2017 was analyzed based on several core extreme precipitation indices(Rx1 day,Rx5 day,CDD,CWD,R20 mm,R25 mm,R95 p,and SDII).The nonparametric Mann–Kendall and Sen’s slope methods were used to compute the statistical strength,stability,and magnitude of trends in annual rainfall,as well as the extreme precipitation indices.We found that 64%of the stations had statistically significant upward trends in yearly rainfall,with high magnitudes frequently observed in the northern and southern regions of the city.For the extreme precipitation indices,only SDII and R25 mm showed dominantly significant trends.Additionally,there were increasing trends in the frequency and duration at the southern and central regions of the city during the study period.Furthermore,El Ni?o-Southern Oscillation and Pacific Decadal Oscillation positively correlated with the duration and negatively correlated with the intensity and frequency of extreme precipitation.Thus,water management plans should be adjusted appropriately to reduce the severe impacts of precipitation extremes on communities and ecosystems.
文摘Imagine a place where you can enjoy your favorite cup of coffee in the company of dozens of koi fish as they swim through ankledeep water that covers the entire floor.That's Thailand's koi fish café.Remember Amix Coffee,the“flooded café”of Ho Chi Minh City,where hundreds of decorative fish of all shapes and sizes lived on the watercovered floor as customers walked among them?
文摘民和黄土地处黄土高原与青藏高原东北缘的交接部位,对气候反应较敏感.对该黄土1.87～0.70Ma BP段进行了CaCO3和有机碳总量(TOC)的采样分析.民和黄土CaCO3含量在5.89%～18.63%之间变化,平均11.41%;有机碳含量较低,在0.007%～0.452%之间,平均0.088%.民和黄土中的CaCO3含量明显高于兰州、洛川和西安等地,而有机碳含量则远低于上述地区.黄土中CaCO3和有机碳含量变化反映了该区1 87 Ma BP以来气候变干冷的趋向.分别受复杂的CaCO3来源与类型、困难的采样、地区上的差异对比等和有机碳保存条件、沉积速率以及'埋藏效应'的影响,黄土中的CaCO3和有机碳的波动变化作为气候变化的替代性指标存在一定的局限性.文章最后指出,在实际应用中,黄土(特别是黄土高原西北部)中CaCO3和有机碳气候指标应结合其他环境指标共同使用,才能从中提取正确的古气候信息.
