摘要
[目的]分析潮河流域的景观空间格局变化及其与径流的关系,为流域生态环境建设提供理论依据。[方法]根据潮河流域50a多的水文气象资料,利用1979,1987,1991和2009年4期遥感影像,采用ArcGIS及Fragstats等景观分析软件计算。[结果]潮河流域的降雨量呈减少趋势,而温度以0.215℃/10a的速度升高,潮河的径流量明显减少,并呈现以28a为周期的丰枯转换;潮河流域斑块个数增加,斑块分布趋于均匀,斑块面积变小并逐渐趋于稳定,斑块形状趋向于简单,复杂化程度降低,流域内景观异质性变弱。[结论]径流量随着景观形状指数的增大而减小,在平均斑块周长为1 050m,流域斑块数量为110 000以及Shannon’s多样性指数为1.33左右时,斑块的综合截留能力最强,流域产流能力最弱。
[Objective] The changes of landscape pattern and relations among landscape index and runoff in Chaohe River watershed were examined in order to provide theoretical basis for the basin ecological environment construction. [Methods] The hydrometeorological data of Chaohe watershed over 50 years, ArcGIS and Fragstats software, landscape index from the remote sensing images （ 1979, 1987, 1991, 2009） of Chaohe River watershed were used. [Results] Precipitation and runoff decreased over time, and the temperature increased at 0. 215℃/10 a. The runoff of Chaohe River decreased significantly with the 28-year cycle of wet and dry conversion ;a steady increasing patches number with decreasing area with more simplicity caused Chaohe River watershed become weak. [Conclusion] Runoff decreased with increase of landscape shape index. When the mean patches perimeter was 1 050 m, the number of patches was 110 000 with Shannon＇s diversity index of about 1.33. Therefore, the comprehensive intercepting ability of patches was the strongest and the watershed runoff capacity was the weakest.
出处
《水土保持通报》
CSCD
2015年第4期34-39,共6页
Bulletin of Soil and Water Conservation
基金
北京市科学研究与研究生培养共建项目"森林植被恢复对密云水库上游流域水文的影响"
国家林业公益性行业科研专项(201204102)
关键词
潮河流域
小波分析
景观格局
径流
Chaohe River watershed
wavelet analysis
landscape pattern
runoff
