Water balance of watershed ecosystem in river upper reaches of Nenjiang

Abstract

Abstract: Taken the second-degree watershed as study unit,on the basis of investigation and analysis on the structure character of the watershed, water balance in different level and scale such as forest types, ecosystem types and watershed was discussed quantitatively.Compared with natural secondary forests of birch, Dahurian birch, and broadleaf tree mixed one, larch plantation showed higher sluice function due to its higher canopy interception percentage. Evapotranspiration was the main form of water transportation in different ecosystems. The amount of runoff of natural mixed forest and larch plantation was significantly less than that of other forest types. The evapotranspiration percentage of grassland was 91.06%, which was higher than that of forests. But the evapotranspiration percentage of farmland was only 81.02%, which was lower than that of forests. It was Suggested that grassland had a very important function in sluice and retention storage capacity. In the end, the evapotranspiration of the total watershed acoounted for 80.84% of the precipitation, and only 23.26% for the runoff.

Key words: Watershed, Ecosystem, Forest, Water balance

CLC Number:

S715.5

CHEN Xiangwei . Water balance of watershed ecosystem in river upper reaches of Nenjiang[J]. Chinese Journal of Applied Ecology, 2001, (6): 903-907.

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