JOURNAL OF NATURAL RESOURCES ›› 2001, Vol. 16 ›› Issue (5): 451-456.doi: 10.11849/zrzyxb.2001.05.009

• Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS • Previous Articles     Next Articles

Hydrological functions of forest vegetation in upper reaches of the Yangtze River

LIU Shi rong1, SUN Peng sen1, WANG Jin xi2, CHEN Lin wu2   

  1. 1. Institute of Forest Ecology and Environment, Chinese Academy of Forestry Science, Beijing 100091;
    2. Sichuan Academy of Forestry Science, Chengdu 610081
  • Received:2001-03-23 Revised:2001-05-21 Online:2001-10-25 Published:2001-10-25

Abstract: : The canopy density and the interception rate of Sichuan Miyaluo subalpine forest are in positive correlation,the interception rate reaches 24% when the canopy density is 0.7 and decreases to 9.5% when the canopy density is 0.3(measured during May and July)litter of arrow bamboo fir mixed stand has the maximum water retaining capacity(6.0 mm)and music fir mixed stand has the minimum(2.8mm),because the former has more associated broad leaf trees and shrubs.The maximum soil water holding capacity,maximum litter water holding capacity and maximum moss layer water holding capacity of the primitive fir forest of Minjiang is much greater than that of the other vegetation types such as secondary growth after cutting.The runoff of the well coverd valley is greater than that of wasteland or open forestland.As to different cutting methods,the runoff increment is:clear cutting> selection cutting>no cutting.Compared with other forest types of China,the relative forest evapotranspiration ratio(Evapotranspiration/preci pitation)of the upper reaches of the Yangtze River is relatively low(30~40%)because of the high altitude and the greater amount of precipitation.

Key words: interception, maximum water retaining capacity of litter, runoff, relative forest eva potranspiration rate

CLC Number: 

  • S715.2