The distribution of hexachlorocyclohexanes(HCHs) and dichlorodiphenyltrichloroethanes(DDTs) in the surface seawater and sediment of Jincheng Bay mariculture area were investigated in the present study. The concentrati...The distribution of hexachlorocyclohexanes(HCHs) and dichlorodiphenyltrichloroethanes(DDTs) in the surface seawater and sediment of Jincheng Bay mariculture area were investigated in the present study. The concentration of total HCHs and DDTs ranged from 2.98 to 14.87 ng L-1 and were < 0.032 ng L-1, respectively, in surface seawater, and ranged from 5.52 to 9.43 and from 4.11 to 6.72 ng g-1, respectively, in surface sediment. It was deduced from the composition profile of HCH isomers and DDT congeners that HCH residues derived from a mixture of technical-grade HCH and lindane whereas the DDT residues derived from technical-grade DDT and dicofol. Moreover, both HCH and DDT residues may mainly originate from historical inputs. The hazard quotient of α-HCH, β-HCH, γ-HCH and δ-HCH to marine species was 0.030, 0.157, 3.008 and 0.008, respectively. It was estimated that the overall probability of adverse biological effect from HCHs was less than 5%, indicating that its risk to seawater column species was low. The threshold effect concentration exceeding frequency of γ-HCH, p,p'-DDD, p,p'-DDE and p,p'-DDT in sediment ranged from 8.3% to 100%, and the relative concentration of the HCH and DDT mixture exceeded their probable effect level in sediment. These findings indicated that the risk to marine benthos was high and potentially detrimental to the safety of aquatic products, e.g., sea cucumber and benthic shellfish.展开更多
Urbanization and different human-economic activities put increasing pressure on the ground water quality, which is considered as the main drinking water resources in Palestine. Protecting the spring water resources in...Urbanization and different human-economic activities put increasing pressure on the ground water quality, which is considered as the main drinking water resources in Palestine. Protecting the spring water resources in Palestine is one major issue for the continuity of the availability of the water resources. An economic feasibility study was conducted for the Nuewimah-Shosha-Dyuk spring system in order to assess the economical factor for the induced methodology of the protection zones. The spring system has multiple users from different sectors (i.e., domestic, agriculture, commercial and public use) and multi-year cost benefit analysis technique used to show the feasibility of water protection zones on the long run. The study shows that even in arid areas in Palestine, small quantities are derived from springs-implementation of water protection zones is still feasible;the results of this study emphasize on importance and feasibility of water resources protection zones.展开更多
As one of the methods of urban environmental assessment,sensitivity assessment of urban climatic environment can accurately reflect the problem areas of current urban climate and built environment through visual means...As one of the methods of urban environmental assessment,sensitivity assessment of urban climatic environment can accurately reflect the problem areas of current urban climate and built environment through visual means,and help cities to carry out sustainable transformation and renewal in the stock era to optimize the living environment.Taking the central urban area of Beijing as the research object,the sensitivity of climatic environment was evaluated by meteorological data and built environment element data.The results showed that the distribution of sensitive units showed a centrifugal radiation pattern of"high in the center and low in the periphery".Block units with high climate sensitivity were mostly concentrated in Xicheng District and Dongcheng District,accounting for 93%of the total number of units.Further research showed that complex built environment and lack of elements to regulate climatic environment were the main reasons for the poor local climatic environment in the region with high climate sensitivity.Finally,a comprehensive evaluation of the remolding capacity,renewal potential and future development intensity of different grades of climate sensitive units was given.The results will provide scientific reference for urban renewal and reconstruction under climatic and environmental changes,so as to promote urban sustainable development and improvement of living environment.展开更多
Guangdong Province started the so-called"three olds redevelopment"in 2009,aiming to advance industrial upgrading.Existing literature points out that appropriate distribution of land rent differential among t...Guangdong Province started the so-called"three olds redevelopment"in 2009,aiming to advance industrial upgrading.Existing literature points out that appropriate distribution of land rent differential among the stakeholders like urban governments,village collectives,and developers is the most important determinant.Employing the theory of urban regime,the paper focuses on the redevelopment process of the Lianjiao Area in the Pearl River Delta region to reveal how the three entities(government,rural community,and developers)interact.It has been found that the local urban government is the main driver which facilitates the positive accumulation of social capital through the supply of redevelopment policy and fi nancial support.Through the reconstruction of trust of villagers and developers,the government gains the rights to coordinate the redevelopment.As the actual landholder,rural villages represent the profi ts of villagers in bargaining with the other two parties.The improvement in infrastructure and the formulation of detailed redevelopment plans increase the land rent differential,encouraging developers’participation in the redevelopment.The three entities form a negotiation-based development alliance and fi nally lead to successful redevelopment.展开更多
The severely threatened Chinese flora urgently needs a new, well adapted to China and properly formulated conservation strategy. The present review provides a detailed conservation methodology that complements previou...The severely threatened Chinese flora urgently needs a new, well adapted to China and properly formulated conservation strategy. The present review provides a detailed conservation methodology that complements previously described guidelines for preservation of plant species with extremely small populations(PSESP) in China. This review adds to the above concept in several aspects, making it relevant to all threatened Chinese plant species. The proposed integral conservation strategy has the following crucial components:-ecoregional basis for conservation planning and implementation;-a unified scoring system that is used in regional systematic planning for reserve design,monitoring and assessment of efficiency of a reserve network, and creation of seed banks and living collections;-a focus on population demography and the presence of naturally occurring regeneration as the key criteria for defining the conservation status of a species and the appropriate major focus of the species recovery plan;-creation of multi-species living collections that preserve species genetic variation and provide material for in situ actions;-experimental translocation of threatened species into multiple locations within and outside their known range.Adopting and implementing these strategies successfully and more fully in China requires that the country changes PA legislation and improves PA management, the National Science Foundation of China(NSFC) re-prioritizes the type of research that receives research funds, and local scientists improve their approach toward information sharing.展开更多
基金supported by the Marine Special Scientific Fund for the Non-profit Public Industry of China (200805031)Fund of Key Laboratory of Fishery Ecology and Environment, Guangdong Province (LFE-20144)Scientific Research Foundation for the Third Institute of Oceanography, State Oceanic Administration (No. 2013031)
文摘The distribution of hexachlorocyclohexanes(HCHs) and dichlorodiphenyltrichloroethanes(DDTs) in the surface seawater and sediment of Jincheng Bay mariculture area were investigated in the present study. The concentration of total HCHs and DDTs ranged from 2.98 to 14.87 ng L-1 and were < 0.032 ng L-1, respectively, in surface seawater, and ranged from 5.52 to 9.43 and from 4.11 to 6.72 ng g-1, respectively, in surface sediment. It was deduced from the composition profile of HCH isomers and DDT congeners that HCH residues derived from a mixture of technical-grade HCH and lindane whereas the DDT residues derived from technical-grade DDT and dicofol. Moreover, both HCH and DDT residues may mainly originate from historical inputs. The hazard quotient of α-HCH, β-HCH, γ-HCH and δ-HCH to marine species was 0.030, 0.157, 3.008 and 0.008, respectively. It was estimated that the overall probability of adverse biological effect from HCHs was less than 5%, indicating that its risk to seawater column species was low. The threshold effect concentration exceeding frequency of γ-HCH, p,p'-DDD, p,p'-DDE and p,p'-DDT in sediment ranged from 8.3% to 100%, and the relative concentration of the HCH and DDT mixture exceeded their probable effect level in sediment. These findings indicated that the risk to marine benthos was high and potentially detrimental to the safety of aquatic products, e.g., sea cucumber and benthic shellfish.
文摘Urbanization and different human-economic activities put increasing pressure on the ground water quality, which is considered as the main drinking water resources in Palestine. Protecting the spring water resources in Palestine is one major issue for the continuity of the availability of the water resources. An economic feasibility study was conducted for the Nuewimah-Shosha-Dyuk spring system in order to assess the economical factor for the induced methodology of the protection zones. The spring system has multiple users from different sectors (i.e., domestic, agriculture, commercial and public use) and multi-year cost benefit analysis technique used to show the feasibility of water protection zones on the long run. The study shows that even in arid areas in Palestine, small quantities are derived from springs-implementation of water protection zones is still feasible;the results of this study emphasize on importance and feasibility of water resources protection zones.
基金Sponsored by General Project of Natural Science Foundation of Beijing City(8202017)Youth Talent Support Program of 2018 Beijing Municipal University Academic Human Resources Development(PXM2018_014212_000043)。
文摘As one of the methods of urban environmental assessment,sensitivity assessment of urban climatic environment can accurately reflect the problem areas of current urban climate and built environment through visual means,and help cities to carry out sustainable transformation and renewal in the stock era to optimize the living environment.Taking the central urban area of Beijing as the research object,the sensitivity of climatic environment was evaluated by meteorological data and built environment element data.The results showed that the distribution of sensitive units showed a centrifugal radiation pattern of"high in the center and low in the periphery".Block units with high climate sensitivity were mostly concentrated in Xicheng District and Dongcheng District,accounting for 93%of the total number of units.Further research showed that complex built environment and lack of elements to regulate climatic environment were the main reasons for the poor local climatic environment in the region with high climate sensitivity.Finally,a comprehensive evaluation of the remolding capacity,renewal potential and future development intensity of different grades of climate sensitive units was given.The results will provide scientific reference for urban renewal and reconstruction under climatic and environmental changes,so as to promote urban sustainable development and improvement of living environment.
文摘Guangdong Province started the so-called"three olds redevelopment"in 2009,aiming to advance industrial upgrading.Existing literature points out that appropriate distribution of land rent differential among the stakeholders like urban governments,village collectives,and developers is the most important determinant.Employing the theory of urban regime,the paper focuses on the redevelopment process of the Lianjiao Area in the Pearl River Delta region to reveal how the three entities(government,rural community,and developers)interact.It has been found that the local urban government is the main driver which facilitates the positive accumulation of social capital through the supply of redevelopment policy and fi nancial support.Through the reconstruction of trust of villagers and developers,the government gains the rights to coordinate the redevelopment.As the actual landholder,rural villages represent the profi ts of villagers in bargaining with the other two parties.The improvement in infrastructure and the formulation of detailed redevelopment plans increase the land rent differential,encouraging developers’participation in the redevelopment.The three entities form a negotiation-based development alliance and fi nally lead to successful redevelopment.
基金supported by the CAS/SAFEA International Partnership Program for Creative Research Teams
文摘The severely threatened Chinese flora urgently needs a new, well adapted to China and properly formulated conservation strategy. The present review provides a detailed conservation methodology that complements previously described guidelines for preservation of plant species with extremely small populations(PSESP) in China. This review adds to the above concept in several aspects, making it relevant to all threatened Chinese plant species. The proposed integral conservation strategy has the following crucial components:-ecoregional basis for conservation planning and implementation;-a unified scoring system that is used in regional systematic planning for reserve design,monitoring and assessment of efficiency of a reserve network, and creation of seed banks and living collections;-a focus on population demography and the presence of naturally occurring regeneration as the key criteria for defining the conservation status of a species and the appropriate major focus of the species recovery plan;-creation of multi-species living collections that preserve species genetic variation and provide material for in situ actions;-experimental translocation of threatened species into multiple locations within and outside their known range.Adopting and implementing these strategies successfully and more fully in China requires that the country changes PA legislation and improves PA management, the National Science Foundation of China(NSFC) re-prioritizes the type of research that receives research funds, and local scientists improve their approach toward information sharing.
