Human activities significantly alter ecosystems and their services; however, quantifying the impact of human activities on ecosystems has been a great challenge in ecosystem management. We used the Universal Soil Loss...Human activities significantly alter ecosystems and their services; however, quantifying the impact of human activities on ecosystems has been a great challenge in ecosystem management. We used the Universal Soil Loss Equation and county-level socioeconomic data to assess the changes in the ecosystem service of soil conservation between 2000 and 2010, and to analyze its spatial characteristics and driving factors in the southwestern China. The results showed that cropland in the southwestern China decreased by 3.74%, while urban land, forest, and grassland areas increased by 46.78%, 0.86%, and 1.12%, respectively. The soil conservation increased by 1.88 × 10^(11) kg, with deterioration only in some local areas. The improved and the degraded areas accounted for 6.41% and 2.44% of the total land area, respectively. Implementation of the Sloping Land Conversion Program and urbanization explained 57.80% and 23.90% of the variation in the soil conservation change, respectively, and were found to be the main factors enhancing soil conservation. The 2008 Wenchuan earthquake was one of the factors that led to the degradation of soil conservation. Furthermore, industrial adjustment, by increasing shares of Industry and Service and reducing those of Agriculture, has also promoted soil conservation. Our results quantitatively showed and emphasized the contributions to soil conservation improvement made by implementing ecological restoration programs and promoting urbanization. Consequently, these results provide basic information to improve our understanding of the effects of ecological restoration programs, and help guide future sustainable urban development and regional industrial restructuring.展开更多
Aiming at alleviating the serious soil erosion, the Chinese government initiated the Sloping Land Conversion Program （SLCP） in 1999. Now; after 8 years of project implementation, the ecological recovery effects of t...Aiming at alleviating the serious soil erosion, the Chinese government initiated the Sloping Land Conversion Program （SLCP） in 1999. Now; after 8 years of project implementation, the ecological recovery effects of the SLCP have become the hot issue of academic circle. This paper; raking the loess hill and gully area of northern Shaanxi as an example, presents a methodology for assessing the vegetation restoration effect of SLCP with normalized difference vegetation index （NDVI）. The key components include calculation of the Growing Season NDVI （GSNDVI）, and estimation of the NVDI change induced by climate and SLCP, respectively. Based on the method, the NDVI change between 2000 and 2006 was obtained using the GSNDVI that excluded the noise from snow and ice. After the part of total NDVI change caused to： climate variation was estimated using empiric formulae, we obtained the part induced by human factors, i.e. the SLCP The human induced part of ND VI change was considered as an approximation indicating the effect of the SLCP on the vegetation. Finally, we analyzed the ND VI change characters of the whole study area, different slope lands and different land use types by spatial statistics method. Results show that the vegetation condition is significantly improved by the SLCP, particularly land types that directly involved in the SLCP, such as steeply slope farmlands, degraded grasslands, etc.展开更多
Taking Ansai County located in loess hilly and gully area as a case, this study analyzes the land use changes driven by the SLCP （Slope Land Conversion Program） and the farmers＇ responses by household survey and pa...Taking Ansai County located in loess hilly and gully area as a case, this study analyzes the land use changes driven by the SLCP （Slope Land Conversion Program） and the farmers＇ responses by household survey and participatory rapid appraisal （PRA）. It is found that the SLCP aroused various changes in land use, agricultural production, rural incomes, etc. In the period of 1999-2005, the farmland and grasslands were reduced by 26,809 ha and 17,571 ha respectively, while forestland increased by 38,203 ha; greenhouse vegetable and orchard got a quick development, with the area enlarged by about 7 times and nearly doubled respectively. The SLCP reduced the area of crops particularly those that normally grown on slope lands, e.g. the sowing area of winter wheat ped from 19.39% of the total cropping area in 1999 to 0.98% in 2005. Draught animals, pigs and sheep have a decline in the number because the remained land and the ban on grazing on natural grasslands can not provide sufficient feed forage. Thanks to the financial subsidy, farmers increased land inputs and thus outputs. To achieve long-term sustainable development and improve rural income, the government should continuously support farmers to improve the land management, to adopt alternative land use systems, and to increase inputs on soil conservation. Vegetable and fruit production are two promise land use systems, and should be further developed.展开更多
One secondary target of the SLCP is poverty reduction. Therefore,the impact of the SLCP on household income is a subject of much research. This study was conducted to determine whether the SLCP has affected incomes of...One secondary target of the SLCP is poverty reduction. Therefore,the impact of the SLCP on household income is a subject of much research. This study was conducted to determine whether the SLCP has affected incomes of households at different income levels13 years after its implementation. Using survey data from 2012 on rural households＇ livelihoods in the upper reaches of the Minjiang River in Sichuan Province and using the non-participating households as a reference,the current impact of the SLCP on household income is calculated with a multiple linear regression model and a quantile regression model. The socio-geographic features of participating and non-participating households are also be compared. The results show no significant differences between the SLCP participating and non-participating households in many socio-demographic characteristics. Participating in the SLCP had no significant impact on household income at all income levels in the study area in 2012. This finding suggests that the SLCP is not currently increasing household income significantly in the study area,and that the implementation plan of the SLCP should be changed in this area in order to achieve its poverty reduction goal.展开更多
基金Under the auspices of National Key Technology Research and Development Program of China(No.2011BAC09B08)Special Issue of National Remote Sensing Survey and Assessment of Eco-Environment Change between 2000 and 2010(No.STSN-04-01)
文摘Human activities significantly alter ecosystems and their services; however, quantifying the impact of human activities on ecosystems has been a great challenge in ecosystem management. We used the Universal Soil Loss Equation and county-level socioeconomic data to assess the changes in the ecosystem service of soil conservation between 2000 and 2010, and to analyze its spatial characteristics and driving factors in the southwestern China. The results showed that cropland in the southwestern China decreased by 3.74%, while urban land, forest, and grassland areas increased by 46.78%, 0.86%, and 1.12%, respectively. The soil conservation increased by 1.88 × 10^(11) kg, with deterioration only in some local areas. The improved and the degraded areas accounted for 6.41% and 2.44% of the total land area, respectively. Implementation of the Sloping Land Conversion Program and urbanization explained 57.80% and 23.90% of the variation in the soil conservation change, respectively, and were found to be the main factors enhancing soil conservation. The 2008 Wenchuan earthquake was one of the factors that led to the degradation of soil conservation. Furthermore, industrial adjustment, by increasing shares of Industry and Service and reducing those of Agriculture, has also promoted soil conservation. Our results quantitatively showed and emphasized the contributions to soil conservation improvement made by implementing ecological restoration programs and promoting urbanization. Consequently, these results provide basic information to improve our understanding of the effects of ecological restoration programs, and help guide future sustainable urban development and regional industrial restructuring.
基金supported by National Natural Science Foundation of China (Grant No.40671007) Major Projects of Knowledge In-novation Program of the Chinese Academy of Sciences (Grant No.KZCX2-YW-421)
文摘Aiming at alleviating the serious soil erosion, the Chinese government initiated the Sloping Land Conversion Program （SLCP） in 1999. Now; after 8 years of project implementation, the ecological recovery effects of the SLCP have become the hot issue of academic circle. This paper; raking the loess hill and gully area of northern Shaanxi as an example, presents a methodology for assessing the vegetation restoration effect of SLCP with normalized difference vegetation index （NDVI）. The key components include calculation of the Growing Season NDVI （GSNDVI）, and estimation of the NVDI change induced by climate and SLCP, respectively. Based on the method, the NDVI change between 2000 and 2006 was obtained using the GSNDVI that excluded the noise from snow and ice. After the part of total NDVI change caused to： climate variation was estimated using empiric formulae, we obtained the part induced by human factors, i.e. the SLCP The human induced part of ND VI change was considered as an approximation indicating the effect of the SLCP on the vegetation. Finally, we analyzed the ND VI change characters of the whole study area, different slope lands and different land use types by spatial statistics method. Results show that the vegetation condition is significantly improved by the SLCP, particularly land types that directly involved in the SLCP, such as steeply slope farmlands, degraded grasslands, etc.
基金supported by National Natural Science Foundation of China(Grant No.40671007)the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.KZCX2-YW-421)the National S&T Support Program(Grant No.2007BAC03A11-01)
文摘Taking Ansai County located in loess hilly and gully area as a case, this study analyzes the land use changes driven by the SLCP （Slope Land Conversion Program） and the farmers＇ responses by household survey and participatory rapid appraisal （PRA）. It is found that the SLCP aroused various changes in land use, agricultural production, rural incomes, etc. In the period of 1999-2005, the farmland and grasslands were reduced by 26,809 ha and 17,571 ha respectively, while forestland increased by 38,203 ha; greenhouse vegetable and orchard got a quick development, with the area enlarged by about 7 times and nearly doubled respectively. The SLCP reduced the area of crops particularly those that normally grown on slope lands, e.g. the sowing area of winter wheat ped from 19.39% of the total cropping area in 1999 to 0.98% in 2005. Draught animals, pigs and sheep have a decline in the number because the remained land and the ban on grazing on natural grasslands can not provide sufficient feed forage. Thanks to the financial subsidy, farmers increased land inputs and thus outputs. To achieve long-term sustainable development and improve rural income, the government should continuously support farmers to improve the land management, to adopt alternative land use systems, and to increase inputs on soil conservation. Vegetable and fruit production are two promise land use systems, and should be further developed.
基金National Key Programme for Developing Basic Science(No.2009CB421105)the Knowledge Innovation Program of the Chinese Academy of Sciences(No.KSCX1-YW-09-01)
基金Robert-Bosch Foundation and the EU integrated project SENSOR(003874)National Key Project for basic research(973)(2009CB421106)+1 种基金Key Program of Knowledge Innovation of CAS(KZCX2-EW-306)China-EU Corporation Program of MOST of China(0813)
基金National Natural Science Foundation of China(41201603)
文摘One secondary target of the SLCP is poverty reduction. Therefore,the impact of the SLCP on household income is a subject of much research. This study was conducted to determine whether the SLCP has affected incomes of households at different income levels13 years after its implementation. Using survey data from 2012 on rural households＇ livelihoods in the upper reaches of the Minjiang River in Sichuan Province and using the non-participating households as a reference,the current impact of the SLCP on household income is calculated with a multiple linear regression model and a quantile regression model. The socio-geographic features of participating and non-participating households are also be compared. The results show no significant differences between the SLCP participating and non-participating households in many socio-demographic characteristics. Participating in the SLCP had no significant impact on household income at all income levels in the study area in 2012. This finding suggests that the SLCP is not currently increasing household income significantly in the study area,and that the implementation plan of the SLCP should be changed in this area in order to achieve its poverty reduction goal.
