Effects of forest harvesting on river runoff in Xiaoxing′anling

Abstract

Abstract: 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 Xiaoxinganling 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 flow.

Key words: Xiaoxing′anling forest region, Forest harvesting, Runoff, Peak flood, Snowmelt runoff amount

CLC Number:

S718

ZHU Daoguang, CAI Tijiu, YAO Yuefeng, JU Cunyong . Effects of forest harvesting on river runoff in Xiaoxing′anling[J]. Chinese Journal of Applied Ecology, 2005, 16(12): 2259-2262.

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