Xainza County on the Qiangtang Plateau（QP） spans a transitionally climatic and eco-environmental zone and is therefore a very sensitive region.Glaciers in this area are one of the most important kinds of land cover ...Xainza County on the Qiangtang Plateau（QP） spans a transitionally climatic and eco-environmental zone and is therefore a very sensitive region.Glaciers in this area are one of the most important kinds of land cover as well as key water resources,yet our understanding of their current status and spatio-temporal change remains limited.Using Landsat images,this study investigated the current distribution of glaciers（2015） in the Xainza Xiegang Mountains as well as the spatio-temporal changes that took place over six time periods between 1976 and 2015.Results show that,in 2015,131 glaciers covered a total area of 74.59 ± 5.25 km^2,mainly located between 5,600 and 6,000 m above sea level（a.s.l）.Between 1976 and 2015,the total number of glaciers increased by 12,while their areas decreased by 24.98%（24.83 km^2）.Glacial retreat has induced a loss of water resources of 11.77 × 10~8 m^3 over the last 39 years,while spatial heterogeneities in glacial changes across various sub-basins,aspects,and altitudinal zones are also clearly observed.Climate warming is the key factor driving this continuous glacial retreat;the high-quality dataset presented in this paper for the Xainza Xiegang study area is crucial for the ongoing assessment of climatic and eco-environmental changes.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National Natural Science Foundation of China(41571104,41101082)the Key Foundation Project of Basic Work of the Ministry of Science and Technology of China(2012FY111400)China Scholarship Council(20140491029)
文摘Xainza County on the Qiangtang Plateau（QP） spans a transitionally climatic and eco-environmental zone and is therefore a very sensitive region.Glaciers in this area are one of the most important kinds of land cover as well as key water resources,yet our understanding of their current status and spatio-temporal change remains limited.Using Landsat images,this study investigated the current distribution of glaciers（2015） in the Xainza Xiegang Mountains as well as the spatio-temporal changes that took place over six time periods between 1976 and 2015.Results show that,in 2015,131 glaciers covered a total area of 74.59 ± 5.25 km^2,mainly located between 5,600 and 6,000 m above sea level（a.s.l）.Between 1976 and 2015,the total number of glaciers increased by 12,while their areas decreased by 24.98%（24.83 km^2）.Glacial retreat has induced a loss of water resources of 11.77 × 10~8 m^3 over the last 39 years,while spatial heterogeneities in glacial changes across various sub-basins,aspects,and altitudinal zones are also clearly observed.Climate warming is the key factor driving this continuous glacial retreat;the high-quality dataset presented in this paper for the Xainza Xiegang study area is crucial for the ongoing assessment of climatic and eco-environmental changes.
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.
