Abstract
Natural tropical forests in the Liusha river basin of xishuangbanna have been replaced by artificial economic forests such as rubber and tea trees since1976. Land use/cover change has affected the annual distribution characteristics of river runoff in the basin. This paper based on Liusha river basin in Menghai hydrology station monthly runoff data from 1963 to 2015. It analyzed the watershed runoff annual distribution of each seasons and month under land use and cover change analyzing the characteristics of distribution of annual runoff by Non-uniform Coefficient Cu, Concentration Ratio Cd, Absolute change ΔR and Relative changes Cm. The Cumulated filter method, Mann Kendall method and R/S analysis method also are used to study the historical and future trends of runoff and its characteristic indexes. Results show that the decade and annual runoff of Liusha river of each season are large difference. The current and future monthly runoff differences are gradually reduced and the annual runoff distribution tends to be concentrated. It can optimize the utilization of water resources and guarantee the regional water security to study the characteristics of land use and cover change on the annual distribution change of river runoff.
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