| Xiaojiang Basin in Luxi County,Yunnan Province,is located in the southwest of the fault basin.It has been disturbed by ecological problems such as rocky desertification,which has a great impact on the regional ecosystem and human well-being.In order to cope with these situations,the national and local govermments have implemented comprehensive measures to control rocky desertification since 2000,which has had an important impact on the local ecosystem services.In order to reveal the changes of human well-being since rocky desertification control,this paper uses various models and methods,including In VEST model and CASA nodel,to calculate the temporal and spatial changes of supply and demand of three key ecosystem services(water,food and carbon sequestration)that different interest groups are conceemed about during 2000-2015,and the response relationship with rocky desertification,as well as the basis.The construction of ecosystem service flow network in villages and towns can provide important reference for the further control of rocky desertification in the region and the coordinated and sustainable development of society,economy and ecology in the Xiaojiang Basin.The main research results are as follows:(1)From 2000 to 2015,the water supply of Xiaojiang Basin was 1.64×108 m3,2.03×108 m3,1.02×108 m3 and 2.37×108 m3,respectively,showing an increasing trend with an increase of 44.5%.The water demand was 1.39×108 m3,1.84×108 m3,1.78×108m3 and 1.9×108 m3,showing an increasing trend with an increase of 36.7%.The water service supply-demand ratio was 0.17,0.10,0.54 and 0.22,respectively.It shows that supply exceeds demand on the whole.(2)From 2000 to 2015,the food supply in Xiaojiang Basin were 6.7 ×104t/a,7.5×104t/a,8.3×104t/a and 1.08×105t/a,respectively,showing an increasing trend with an increase of 61.2%.The food demand were 4.9×104t/a 4.3×104t/a 4.0×104t/a and 4.0×104t/a respectively,showing a decreasing trend with a decrease of 18.1%.The ratios of supply and demand for food were 0.31,0.55,0.70 and 0.92,respectively showing that the overall supply exceeds demand in each year,and the ratio of supply to demand is increasing.(3)From 2000 to 2015,the carbon sequestration supply in Xiaojiang River Basin were 3.32×105t/a,3.59×106 t/a,3.38×105t/a and 5.03×105t/a,respectively,showing an overall increase trend of 51.8%.The carbon sequestration demand were 1.8×105t/a,3.3×105t/a,4.9×105t/a and 5.3×105t/a,respectively,showing a rapid growth trend,with an increase of 194%.The carbon sequestration supply-demand ratio was 0.59,0.10,-0.36 and-0.04 indicate that on the whole,the supply of carbon sequestration in Xiaojiang Basin has changed from supply exceeding demand to supply exceeding demand.(4)The area of rocky desertification in Xiaojiang Basin showed a significant decreasing trend from 232.997 km2 in 2005 to 189.17 km2 in 2015,with a decrease of 18.81%.Compared with the rocky desertification and non-rocky desertification areas in Xiaojiang Basin during 2005-2015,the water and carbon sequestration in rocky desertification areas were less than those in non-rocky desertification areas.By comparing the area of rocky desertification,it is found that the impact of food supply is significantly stronger than that of water and carbon sequestration.with the change of rocky desertification area,that is,the degree of rocky desertification control is deepened,the positive impact of rocky desertification control on ecosystem services is more obvious.(5)On the whole,the relationship between the three ecosystem services in the administrative villages is not very strong,and the better areas are mostly concentrated on the west side of the basin.From 2000 to 2015,the importance of water nodes in Xiaojiang Basin decreased slightly on the whole,and the flow relationship of water in Xiaojiang Basin weakened on the whole,while food and carbon sequestration increased slightly.In all villages and towns,the central town,Longdian village,Yongning village,Democracy village,Shidong village and Wulang village are at the core of the ecosystem service network in Xiaojiang Basin.We need to focus on the ecosystem status of these villages and towns. |
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