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Rainfall redistribution traits of three main forest types in Dagangshan Mountains of Jiangxi Province, China.

LI Dao-ning1, WANG Bing2, CAI Ti-jiu3, YIN Zhuo1, JU Cun-yong3   

  1. (1Ecological Research Center, Northeast Forestry University, Harbin 150040, China; 2Institute of Forest Ecology and Environmental Protection, Chinese Academy of Forestry, Beijing 100091, China; 3College of Forestry, Northeast Forestry University, Harbin 150040, China)
  • Online:2014-08-18 Published:2014-08-18

Abstract: The redistribution processes of rainfall due to the canopy were studied on three typical forest types (Chinese fir forest, evergreen broadleaved forest and Phyllostachys pubescens forest) in Dagangshan Mountains of Jiangxi Province. The results showed that from April to June, 2012, the total precipitation was 531.6 mm, with the maximum single rainfall of 61.7 mm. The rainfall in this area was mainly  light and moderate. During the research period, the total throughfall of P. pubescens forest was the greatest, and that of evergreen broadleaved forest was the smallest. The throughfall of P. pubescens and Chinese fir forest were almost equal at the same rainfall intensity. However, the throughfall of evergreen broadleaved forest was  smaller than those of the other two types of forest at the same high rainfall intensity. Throughfall presented a distinct spatial variability within each forest. Stemflow of Chinese fir forest, evergreen broadleaved forest and P. pubescens forest were 1.4%, 8.9% and 8.8%, respectively. There were significant differences (P<0.01) in stemflow between the Chinese fir forest and the other two types of forests. In addition, the moisture degree of forests before a rain event greatly influenced the quantity of the stemflow. The effect was strongest in the Chinese fir plantation and weakest in the P. pubescens forest. The proportion of interception to rainfall was in a descending order of 30.5%, 25.5% and 19.2% for the Chinese fir forest, the evergreen broad-leaved forest and the P. pubescens forest, respectively. The Chinese fir forest had the obviously greater interception rate than the other two types of forests under usual rainfall in the study area.