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作 者 ：张晓明¹;曹文洪¹;余新晓²;张满良³;王向东¹;朱毕生¹

期 刊 ：应用生态学报 2009年 20卷 01期 页码：121-127

关键词：黄土；

摘 要 ：基于动力水文过程测定技术和景观生态学测度方法，对位于黄土丘陵沟壑区第三副区的甘肃天水罗玉沟流域1986—2004年土地利用/覆被变化对流域径流输沙的影响进行了研究.结果表明：研究期间，罗玉沟流域土地利用/覆被变化对年径流输沙有显著影响，1995—2004年的输沙量比1986—1994年减少约63.0%，且随着年降水量的增多，其减沙效应明显;土地利用/覆被变化对流域径流输沙的影响具有季节性特征，相对于1986—1994年而言，研究区1995—2004年的减沙效应主要集中在5—10月，且月降水越多，后期的月均输沙量较前期减少得越多.降雨和洪峰流量频率分析表明，若具有相同频率分布的雨强，则任一重现期下罗玉沟流域1995—2004年的洪水平均含沙量小于1986—1994年.

Abstract:By using the measurement technique of dynamic hydrological process and the estim
ation method of landscape ecology, this paper studied the effects of 1986〖KG-*2
〗-〖KG-*7〗2004 land use/cover change (LUCC) on the runoff sediment discharge i
n the Luoyugou watershed in Tianshui of Gansu Province in third sub-region of L
oess Plateau. The results showed that the LUCC in Luoyugou watershed had signifi
cant effects on the annual sediment yield. In 1995〖KG-*2〗-〖KG-*7〗2004, the s
ediment discharge was reduced by approximately 630%, compared with that in 198
6〖KG-*2〗-〖KG-*7〗1994, and the reduction effect was more significant with inc
reasing annual precipitation. The effects of LUCC on sediment discharge demonstr
ated seasonal fluctuation characteristic. Relative to that in 1986〖KG-*2〗-〖KG
-*7〗1994, the reduction effect of sediment discharge in 1995〖KG-*2〗-〖KG-*7〗
2004 was more concentrated in the period from May to October, and, the more the
monthly precipitation, the more the reduction of monthly average sediment discha
rge in 1995〖KG-*2〗-〖KG-*7〗2004 than in 1986〖KG-*2〗-〖KG-*7〗1994. The anal
ysis on precipitation and flood peak discharge frequency indicated that under th
e same frequency distribution of precipitation intensity, the average sediment c
oncentration in any recurrence period in Luoyugou watershed was smaller in 1995
〖KG-*2〗-〖KG-*7〗2004 than in 1986〖KG-*2〗-〖KG-*7〗1994.

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