【目的】在城市时空动态演变中,对广州市海珠区未来发展的不同情景进行模拟,探索城市动态发展和区域协同引导下城市生态网络韧性测度方法与设计响应,在中观尺度下讨论城市可持续发展的导向及规划策略。【方法】以广州市海珠区为例,提出...【目的】在城市时空动态演变中,对广州市海珠区未来发展的不同情景进行模拟,探索城市动态发展和区域协同引导下城市生态网络韧性测度方法与设计响应,在中观尺度下讨论城市可持续发展的导向及规划策略。【方法】以广州市海珠区为例,提出“城市-湿地复合体”概念并总结其特征,运用斑块级土地利用变化模拟(patch-generating land use simulation,PLUS)模型,模拟2030年自然发展、城市扩张和生态优先3种情景下的土地利用格局,结合形态学空间格局分析(morphological spatial pattern analysis,MSPA)与图论方法,构建动态演进的生态网络并量化其韧性特征。通过介数中心性分析和节点删除算法,评估生态网络结构韧性与功能韧性,揭示“城市-湿地复合体”的韧性响应机制。【结果】海珠区生态源地的分布与珠江河网、湿地公园(如海珠湿地)及城市绿地系统高度重合。自然发展情景下生态网络连通性、抗干扰能力和连接效率最高,结构韧性强;城市扩张情景下生态网络对关键节点依赖性增强,功能韧性较弱;生态优先情景下生态网络韧性阈值最高,韧性水平高。【结论】生态网络是保障城市生态韧性的关键载体。“城市-湿地复合体”生态网络韧性测度,可以为中观尺度下城市生态敏感区的生态韧性强化及设计响应提供新思路。展开更多
From the viewpoint of systems science, this article takes Xiaosha River artificial wetland under planning and construction as object of study based on the systems theory and takes the accomplished and running project ...From the viewpoint of systems science, this article takes Xiaosha River artificial wetland under planning and construction as object of study based on the systems theory and takes the accomplished and running project of Xinxuehe artificial wetland as reference. The virtual data of quantity and quality of inflow and the quality of outflow of Xiaosha River artificial wetland are built up according to the running experience, forecasting model and theoretical method of the reference project as well as the comparison analysis of the similarity and difference of the two example projects. The virtual data are used to study the building of forecasting model of BP neural network of Xiaosha River artificial wetland.展开更多
The suspended and dissolved waste in the incoming storm water of wetlands largely depends on the adjacent land use which can influence the quality of the water body. The micro- and macro-floral population of a wetland...The suspended and dissolved waste in the incoming storm water of wetlands largely depends on the adjacent land use which can influence the quality of the water body. The micro- and macro-floral population of a wetland can absorb, convert, transform and release different organic or inorganic elements, which can also change or impact the overall quality of the wetland water. The present study investigates the influence of the land use and the plant species in the waterbed on the water quality of a high-altitude, sub-tropical wetland in India. The estimation capabilities of neuro-genetic models were utilized to identify the inherent relationships between the Biochemical Oxygen Demand (BOD), Dissolved Oxygen (DO), chlorine (Cl) and Chemical Oxygen Demand (COD) with the land use and wetland zoology. A thematic map of the quality parameters was also generated based on the identified relationship to observe the influence that the morphological and biological diversity in and around the study area has on the quality parameters of the wetland. According to the results, the BOD, COD and Cl were found to vary with differences in land use and the presence of different plant species, whereas the DO was found to be largely invariant with changes in these parameters. The reasons may be contributed to the impact of uncontrolled eco-tourism activities around the wetland.展开更多
Dibenzothiophene(DBT) degradation mechanisms and the transformation of pathways during the incubation of three types of coastal sediments with C/N ratios ranging from 1 to 9 were investigated. The DBT degradation effi...Dibenzothiophene(DBT) degradation mechanisms and the transformation of pathways during the incubation of three types of coastal sediments with C/N ratios ranging from 1 to 9 were investigated. The DBT degradation efficiencies were clearly improved with increasing C/N ratio in reed wetland sediments, tidal wetlands sediments and estuary wetland sediments. The quantitative response relationships between DBT degradation rates and related functional genes demonstrate that the Kodama pathway-related gene groups were dominant factors at low C/N ratios, while the 4S-related gene groups mainly determined the degradation rate when the C/N ratio was up to 5. Network analysis also shows that the pathway shifts from the Kodama pathway to the 4S pathway occurred through changes in the connections between functional genomes and rates. Furthermore, there were competition and collaboration between the Kodama and 4S pathways. The 4S pathway-related bacteria were more active in estuary wetland sediments compared with reed wetland sediments and tidal wetland sediments. The higher degradation efficiency in estuary wetland sediments may indicate the greater participation of the 4S pathway in the DBT biodegradation reaction. And the effects of ring cleavage of Kodama pathway caused more complete metabolizing of DBT.展开更多
文摘【目的】在城市时空动态演变中,对广州市海珠区未来发展的不同情景进行模拟,探索城市动态发展和区域协同引导下城市生态网络韧性测度方法与设计响应,在中观尺度下讨论城市可持续发展的导向及规划策略。【方法】以广州市海珠区为例,提出“城市-湿地复合体”概念并总结其特征,运用斑块级土地利用变化模拟(patch-generating land use simulation,PLUS)模型,模拟2030年自然发展、城市扩张和生态优先3种情景下的土地利用格局,结合形态学空间格局分析(morphological spatial pattern analysis,MSPA)与图论方法,构建动态演进的生态网络并量化其韧性特征。通过介数中心性分析和节点删除算法,评估生态网络结构韧性与功能韧性,揭示“城市-湿地复合体”的韧性响应机制。【结果】海珠区生态源地的分布与珠江河网、湿地公园(如海珠湿地)及城市绿地系统高度重合。自然发展情景下生态网络连通性、抗干扰能力和连接效率最高,结构韧性强;城市扩张情景下生态网络对关键节点依赖性增强,功能韧性较弱;生态优先情景下生态网络韧性阈值最高,韧性水平高。【结论】生态网络是保障城市生态韧性的关键载体。“城市-湿地复合体”生态网络韧性测度,可以为中观尺度下城市生态敏感区的生态韧性强化及设计响应提供新思路。
文摘From the viewpoint of systems science, this article takes Xiaosha River artificial wetland under planning and construction as object of study based on the systems theory and takes the accomplished and running project of Xinxuehe artificial wetland as reference. The virtual data of quantity and quality of inflow and the quality of outflow of Xiaosha River artificial wetland are built up according to the running experience, forecasting model and theoretical method of the reference project as well as the comparison analysis of the similarity and difference of the two example projects. The virtual data are used to study the building of forecasting model of BP neural network of Xiaosha River artificial wetland.
文摘The suspended and dissolved waste in the incoming storm water of wetlands largely depends on the adjacent land use which can influence the quality of the water body. The micro- and macro-floral population of a wetland can absorb, convert, transform and release different organic or inorganic elements, which can also change or impact the overall quality of the wetland water. The present study investigates the influence of the land use and the plant species in the waterbed on the water quality of a high-altitude, sub-tropical wetland in India. The estimation capabilities of neuro-genetic models were utilized to identify the inherent relationships between the Biochemical Oxygen Demand (BOD), Dissolved Oxygen (DO), chlorine (Cl) and Chemical Oxygen Demand (COD) with the land use and wetland zoology. A thematic map of the quality parameters was also generated based on the identified relationship to observe the influence that the morphological and biological diversity in and around the study area has on the quality parameters of the wetland. According to the results, the BOD, COD and Cl were found to vary with differences in land use and the presence of different plant species, whereas the DO was found to be largely invariant with changes in these parameters. The reasons may be contributed to the impact of uncontrolled eco-tourism activities around the wetland.
基金Foundation for Innovative Research Groups of the National Natural Science Foundation of China (No.51721006)the National Natural Science Foundation of China (No.51679001) provided support for this study
文摘Dibenzothiophene(DBT) degradation mechanisms and the transformation of pathways during the incubation of three types of coastal sediments with C/N ratios ranging from 1 to 9 were investigated. The DBT degradation efficiencies were clearly improved with increasing C/N ratio in reed wetland sediments, tidal wetlands sediments and estuary wetland sediments. The quantitative response relationships between DBT degradation rates and related functional genes demonstrate that the Kodama pathway-related gene groups were dominant factors at low C/N ratios, while the 4S-related gene groups mainly determined the degradation rate when the C/N ratio was up to 5. Network analysis also shows that the pathway shifts from the Kodama pathway to the 4S pathway occurred through changes in the connections between functional genomes and rates. Furthermore, there were competition and collaboration between the Kodama and 4S pathways. The 4S pathway-related bacteria were more active in estuary wetland sediments compared with reed wetland sediments and tidal wetland sediments. The higher degradation efficiency in estuary wetland sediments may indicate the greater participation of the 4S pathway in the DBT biodegradation reaction. And the effects of ring cleavage of Kodama pathway caused more complete metabolizing of DBT.
