The structure of Pb,Zn,Cu and Cd in lead zinc ore tailing soils in Yongzhou,Hunan is analyzed by the optimized BCR sequential extraction procedure.The content and proportion of heavy metals of the mine are measured.Me...The structure of Pb,Zn,Cu and Cd in lead zinc ore tailing soils in Yongzhou,Hunan is analyzed by the optimized BCR sequential extraction procedure.The content and proportion of heavy metals of the mine are measured.Meanwhile,the ecological risks are evaluated with the Lars Hakanson's potential ecological risk exponential method.The analysis shows that the content of heavy metals is very high,reaching the level of serious pollution.The order of metal pollution degrees are Cd〉Pb〉Cu〉Zn.On the other hand,it is very possible that the heavy metals may combine together as compounds or cling to the crystal form of clay.Since the form of soluble acid and free metals are very little,it is not an easy job for metal elating or restoration of plants.Yet it is possible to take out those heavy metals adopting the chemical extraction technology.DTPA and EDTA,indicated by a research,both have iterative value and strong conformity effect.So they are effective elutriants to restore the polluted soil.A chemical extraction method is put forward in this paper.展开更多
As one kind of land use practice, traditional agroforestry systems already have a long history of hundreds of years in practice and still play a significant role in the world today, especially in tropical and sub-trop...As one kind of land use practice, traditional agroforestry systems already have a long history of hundreds of years in practice and still play a significant role in the world today, especially in tropical and sub-tropical areas. In this era of globalization and food in security, more and more governments and non-governmental organizations are paying attention to traditional agroforestry systems because of their economic, ecological and socio-culture beneifts. These beneifts are also in accord with the characteristics of Globaly Important Agricultural Heritage Systems (GIAHS). So far, four typical traditional agroforestry systems from five countries have been designated as GIAHS. These traditional agroforestry systems have rich agricultural and associated biodiversity, multiple ecosystem services and precious socio-culture values at a regional and global level. Although traditional agroforestry systems are confronted with many threats and challenges, such as population growth, migration, market impact, climate change and so on, as long as governments and non-governmental organizations, local communities and smallholders can cooperate with each other, traditional agroforestry systems will be effectively protected and wil remain in the future a sustainable global land use practice.展开更多
Implementing wildlife-friendly farming (WFF) practices is a sound approach to sustain ecological restoration of farmland. The aims of the study were to explore factors affecting farmers’ implementation of WFF pract...Implementing wildlife-friendly farming (WFF) practices is a sound approach to sustain ecological restoration of farmland. The aims of the study were to explore factors affecting farmers’ implementation of WFF practices on Sado Island, Japan and to consider the policy implications of disseminating such practices. All 5010 farming households on Sado Island, who are distributing rice to Japan Agricultural Cooperatives (JA), were surveyed. In total, 2231 households responded to the questionnaire (response 44.5%). By comparing the attitudes, beliefs, and attributes of non-certiifed versus certiifed farmers, we identiifed key factors affecting farmers’ implementation of WFF practices. Compared with non-certified farmers, certified farmers: (i) showed a greater interest in biodiversity and the ifnancial beneifts of WFF; (i) had a larger number of certiifed farmer friends; (ii) felt many more pressures and expectations from consumers, in particular; and (iv) were not hampered by bad labor or farmland conditions when implementing WFF practices. To further disseminate WFF practices in Sado, we suggest that the information on the effectiveness of WFF on paddy ifeld biodiversity is used in public education, and opportunities for interchanging opinions are set up between non-certiifed and certiifed farmers, as wel as between farmers and consumers.展开更多
Chagusaba,which is traditional tea-grass integrated system in Shizuoka,is one of Globally Important Agricultural Heritage Systems(GIAHS) sites in Japan.Chagusaba provide an important habitat for natural plant specie...Chagusaba,which is traditional tea-grass integrated system in Shizuoka,is one of Globally Important Agricultural Heritage Systems(GIAHS) sites in Japan.Chagusaba provide an important habitat for natural plant species.In this study,we investigated the flora in Chagusaba and environmental factors to affect the number of native species estimated their diversity.Fifty Chagusaba were classified in to five vegetation types by Two-way indicator species analysis.In addition,high number of native plant species Chagusaba had low soil p H,covered large areas,and were in places where the land had not been modified.Through statistical analysis(GLM),we found that land modification had an especially significant effect on the diversity of native plants,and that the diversity of native plants was reflected in the history of the use of the land.展开更多
基金This work is supported by Chinese National Programs for High Technology Research and Development (Grant No. 2001AA644020);Natural Science Foundation of Hunan Province (Grant No. 04JJ3013).
文摘The structure of Pb,Zn,Cu and Cd in lead zinc ore tailing soils in Yongzhou,Hunan is analyzed by the optimized BCR sequential extraction procedure.The content and proportion of heavy metals of the mine are measured.Meanwhile,the ecological risks are evaluated with the Lars Hakanson's potential ecological risk exponential method.The analysis shows that the content of heavy metals is very high,reaching the level of serious pollution.The order of metal pollution degrees are Cd〉Pb〉Cu〉Zn.On the other hand,it is very possible that the heavy metals may combine together as compounds or cling to the crystal form of clay.Since the form of soluble acid and free metals are very little,it is not an easy job for metal elating or restoration of plants.Yet it is possible to take out those heavy metals adopting the chemical extraction technology.DTPA and EDTA,indicated by a research,both have iterative value and strong conformity effect.So they are effective elutriants to restore the polluted soil.A chemical extraction method is put forward in this paper.
基金Research on soft science of forestry(2014-R05)Consulting Project of the Chinese Academy of Engineering(2013-XZ-22)Chinese Academy of Sciences Visiting Professorship for Senior International Scientists(2013T2Z0011)
文摘As one kind of land use practice, traditional agroforestry systems already have a long history of hundreds of years in practice and still play a significant role in the world today, especially in tropical and sub-tropical areas. In this era of globalization and food in security, more and more governments and non-governmental organizations are paying attention to traditional agroforestry systems because of their economic, ecological and socio-culture beneifts. These beneifts are also in accord with the characteristics of Globaly Important Agricultural Heritage Systems (GIAHS). So far, four typical traditional agroforestry systems from five countries have been designated as GIAHS. These traditional agroforestry systems have rich agricultural and associated biodiversity, multiple ecosystem services and precious socio-culture values at a regional and global level. Although traditional agroforestry systems are confronted with many threats and challenges, such as population growth, migration, market impact, climate change and so on, as long as governments and non-governmental organizations, local communities and smallholders can cooperate with each other, traditional agroforestry systems will be effectively protected and wil remain in the future a sustainable global land use practice.
基金supported by the Ecological Restoration Programme (a donated programme from Sado City) at CTER
文摘Implementing wildlife-friendly farming (WFF) practices is a sound approach to sustain ecological restoration of farmland. The aims of the study were to explore factors affecting farmers’ implementation of WFF practices on Sado Island, Japan and to consider the policy implications of disseminating such practices. All 5010 farming households on Sado Island, who are distributing rice to Japan Agricultural Cooperatives (JA), were surveyed. In total, 2231 households responded to the questionnaire (response 44.5%). By comparing the attitudes, beliefs, and attributes of non-certiifed versus certiifed farmers, we identiifed key factors affecting farmers’ implementation of WFF practices. Compared with non-certified farmers, certified farmers: (i) showed a greater interest in biodiversity and the ifnancial beneifts of WFF; (i) had a larger number of certiifed farmer friends; (ii) felt many more pressures and expectations from consumers, in particular; and (iv) were not hampered by bad labor or farmland conditions when implementing WFF practices. To further disseminate WFF practices in Sado, we suggest that the information on the effectiveness of WFF on paddy ifeld biodiversity is used in public education, and opportunities for interchanging opinions are set up between non-certiifed and certiifed farmers, as wel as between farmers and consumers.
文摘Chagusaba,which is traditional tea-grass integrated system in Shizuoka,is one of Globally Important Agricultural Heritage Systems(GIAHS) sites in Japan.Chagusaba provide an important habitat for natural plant species.In this study,we investigated the flora in Chagusaba and environmental factors to affect the number of native species estimated their diversity.Fifty Chagusaba were classified in to five vegetation types by Two-way indicator species analysis.In addition,high number of native plant species Chagusaba had low soil p H,covered large areas,and were in places where the land had not been modified.Through statistical analysis(GLM),we found that land modification had an especially significant effect on the diversity of native plants,and that the diversity of native plants was reflected in the history of the use of the land.