Chin J Plan Ecolo ›› 1997, Vol. 21 ›› Issue (5): 433-440.

• Research Articles • Previous Articles     Next Articles

Soil and Water Conservation by Forest Vegetation in Loess Area

Yu Xinxiao, Bi Huaxing, Zhu Jinzhao and Wu Bin   

  • Published:1997-05-10
  • Contact: Liu Xingjiang

Abstract: During 1988~1993,about 70 times of floods were systematically observed in the sites located at 4 watersheds(in two groups) of different forest vegetation in Loess Area. Based on the data, the relationship among watershed sediment yield, the forest vegetation and the other 4 factors were investigated and modeled. Then the effects of forest vegetation on watershed sediment yield were analyzed using the model. The result shows that forest vegetation had a great role in yielding watershed sediment. The sediment yield in Miaogou small watershed (no forest vegetation) was higher by 33.4 times than that in Mujialing small watershed (with much forest vegetation). Its erosion control by forest vegetation was about 96.8%. The sediment yield in Miaogou watershed (with little forest vegetation) was higher by 4.3 times than that in Mujialing watershed (with much forest vegetation). Its erosion control by forest vegetation was about 75.53%. According to the analysis of erosion control effect by forest vegetation in loess area ,the erosion reduction formulas of forest vegetation were derived. Using these formulas,the reductions of watershed sediment due to forest vegetation under the conditions of different rainfalls can be calculated.