清港河流域土地利用变化对径流的影响

土地利用的变化对径流产生具有重要影响，以长江上游清港河流域为研究对象，应用SWAT分布式水文模型，结合1987年和2000年的土地利用影像资料，以及清港河流域1969—1987年的气候、水文资料，分析土地利用/覆被变化对清港河流域径流的影响。结果表明：2000年土地利用模式较1987年的土地利用模式减少了年径流量，使月径流分配上更为合理，减少了降雨量较大的6—9月丰水期的产流量，增加了10月至翌年5月枯水期的产流量；2种土地利用模式下的年产流量的差值与年降雨量的关系并不密切，而平均月产流量的差值，随着降雨量的增大而增大。说明2000年土地利用模式更有利于清港河流域生态环境的保护。

Effects of land-use change on the runoff in Qingganghe River Basin

Land-use change has great influence on the occurrence of runoff.Based on the remote sensing data of 1987 and 2000,and nearly twenty years meteorological and hydrological data(1969—1987),SWAT was adopted to analyze the effect of landuse on runoff in Qingganghe River basin.Results showed that,compare to the land-use in 1987,annual runoff decreased under the land-use condition in 2000.And the distribution of monthly runoff is more rational under the land-use condition in 2000 by decreasing the monthly runoff from June to September and increasing that from October to May of next year.The value difference of annual runoff was not related to annual precipitation,but the value difference of average monthly runoff increased with precipitation.The results also showed that the land-use in 2000 is more beneficial for the protection of eco-environment of Qingganghe River Basin.