江西省大岗山毛竹林水文效应研究

Study on Hydrological Effects in Mao Bamboo Plantations

通过分析江西省大岗山毛竹林水文学过程,对降水及其在系统内的分配量和季节变化进行研究。结果表明:毛竹林内穿透雨和树干茎流随降雨量的增加而增大,冠层截留与降雨量呈指数关系,年平均截留率为11.1％,树干茎流率为4.4％。毛竹根系对土壤物理性质影响较大,0～60cm土层的总孔隙度为71.7％,林地稳渗率达8.28mm/min。该小流域年径流系数为54.8％,地表径流仅占0.8％,壤中流占15.0％,地下径流占39.0％,显示出毛竹林地较好的涵养水源功能。

The water cycling of hydrological processes of Phyllostachys pubescens Mazel ex H. de Lehaie plantation is analyzed in this paper. Precipitation and its allotting amount in the system and its seasonal changes are studied. The results show that: throughfall and stemflow in P. pubescens plantations increased with the increase of precipitation. There is an index relation between the canopy interception and precipitation. The annual canopy interception ratio of P. pubescens plantation is 11.1%, stemflow latio is 4.4%. The root system of P. pubescens has a greater effect on soil physical properties. As for the soil layer of o^60cm, the total porosity is 71.7%, final infiltration ratio 8.28mm/min. The yearly runoff ratio in the researched watershed 54.8%,surface runoff only 0.8%,interflow ratio 15.0% and underflow 39.0%, it demonstrates that there is a fairly good effect of water consevation in P. pubescens plantations.