Assessment of Water Conservation Capacity and Influencing Factors in Yunnan Province Based on Multi-Source Data
The objective of this study was to quantitatively assess the spatial and temporal evolution charac-teristics and driving forces of water conservation functions in Yunnan Province,with a view to providing a theoretical basis and decision-making reference for ecological environment restoration in the province.Based on the data of land use,meteorology,soil and topography for 7 periods from 1990 to 2020,we applied the InVEST model to study the water conservation pattern of various prefectures and cities in Yunnan Province.Combined geodetector and principal component systematic clustering method,the influencing fac-tors of 18 environmental factors were explored.The results showed that the ecosystems in Yunnan Prov-ince were dominated by forest,scrub and grassland ecosystems,and forest and shrub ecosystems play the main functions for water conservation in the province from 1990 to 2020;the total amount of water conser-vation and the average water conservation capacity of the province showed a fluctuating upward trend from 1990 to 2020;and the water conservation patterns of all the prefectures and cities in the province had a sig-nificant increase in water conservation.The pattern of water conservation had significant regional differ-ences,the quantity of water conservation was in the order of Pu'er City>Honghe Prefecture>Wenshan Prefecture>Dali Prefecture>Chuxiong Prefecture>Qujing City>Lincang City>Xishuangbanna Prefec-ture>Baoshan City>Zhaotong City>Kunming City>Lijiang City>Diqing Prefecture>Yuxi City>Nujiang Prefecture>Dehong Prefecture,and water conservation capacity was in the order of Xishuangban-na Prefecture>Pu'er City>Dehong Prefecture>Lincang City>Baoshan City>Wenshan Prefecture>Honghe Prefecture>Yuxi City>Dali Prefecture>Chuxiong Prefecture>Kunming City>Nujiang Prefec-ture>Qujing City>Zhaotong City>Lijiang City>Diqing Prefecture;water conservation pattern in the province during 1990-2020 exhibited a significant spatial heterogeneity,the centre of gravity of water con-servation shifted along the direction of northeast-southeast-southwest-southwest-southwest-northeast-southeast,showing an arched-like shape.The key areas of water conservation had experienced a variation of contraction,contraction again,expansion,large expansion,expansion,large contraction,slight expansion.The water conservation heterogeneity in Yunnan Province is the result of the joint action of multiple fac-tors,meteorological factor is the key factor leading to the formation of heterogeneity,the human factor is a direct factor in the formation of heterogeneity caused by the modification of the subsurface.
万方数据
维普
