[Effects of land use/cover change on runoff sediment discharge in typical watershed in Loess gullied-hilly region of China].
By using the measurement technique of dynamic hydrological process and the estimation method of landscape ecology, this paper studied the effects of 1986-2004 land use/cover change (LUCC) on the runoff sediment discharge in the Luoyugou watershed in Tianshui of Gansu Province in third sub-region of Loess Plateau. The results showed that the LUCC in Luoyugou watershed had significant effects on the annual sediment yield. In 1995-2004, the sediment discharge was reduced by approximately 63.0%, compared with that in 1986-1994, and the reduction effect was more significant with increasing annual precipitation. The effects of LUCC on sediment discharge demonstrated seasonal fluctuation characteristic. Relative to that in 1986-1994, the reduction effect of sediment discharge in 1995-2004 was more concentrated in the period from May to October, and, the more the monthly precipitation, the more the reduction of monthly average sediment discharge in 1995-2004 than in 1986-1994. The analysis on precipitation and flood peak discharge frequency indicated that under the same frequency distribution of precipitation intensity, the average sediment concentration in any recurrence period in Luoyugou watershed was smaller in 1995-2004 than in 1986-1994.
Zhang
Xiao-ming
XM
China Institute of Water Resources and Hydropower Research, Beijing 100044, China. zxmwq@126.com
Cao
Wen-hong
WH
Yu
Xin-xiao
XX
Zhang
Man-liang
ML
Wang
Xiang-dong
XD
Zhu
Bi-sheng
BS
D002681:China; D003247:Conservation of Natural Resources; D018556:Crops, Agricultural / Q000254:growth & development; D017753:Ecosystem; D004784:Environmental Monitoring; D005618:Fresh Water / Q000032:analysis*; D019015:Geologic Sediments / Q000032:analysis*; D011891:Rain; D045483:Rivers; D012621:Seasons; D012822:Silicon Dioxide / Q000032:analysis*; D014197:Trees / Q000254:growth & development
D012822:Silicon Dioxide