[Effects of forest harvesting on river runoff in Xiaoxing'anling].
By the method of runoff determination in large basin combined with contrast experiment in small watershed, and based on the runoff and forest resources data in past 35 years, this paper studied the serial changes of river runoff in Xiaoxing'anling after forest harvesting. The results showed that the river flow was increased in the early 10 years after forest harvesting, but decreased gradually with the growth and crown closure of artificial larch forest, tended towards or even lower than the level before harvesting. The river runoff had a close correlation with annual rainfall and the areas of forest harvesting and regeneration. Significant positive correlation was observed between annual flow and forest harvesting area, which resulted in the increase of river runoff after forest harvesting. Forest harvesting could also significantly increase the peak flood and snowmelt runoff. There was a negative correlation between regenerated forest area and annual flow, and thus, forest regeneration would decrease annual
Zhu
Daoguang
D
School of Forestry, Northeast Forestry University, Harbin 150040, China. zhudgl@163.com
Cai
Tijiu
T
Yao
Yuefeng
Y
Ju
Cunyong
C
D002681:China; D003247:Conservation of Natural Resources; D045483:Rivers; D014197:Trees / Q000254:growth & development*; D014872:Water Movements