楠竹林地不同时间尺度降雨径流过程及趋势研究

楠竹林是缙云山森林生态系统的一种典型植被类型,为揭示该植被类型对降雨径流过程的影响,对设置在重庆缙云山楠竹林地的径流小区2002—2007年的水文观测资料进行了研究。研究发现:①2002—2007年,楠竹林的降雨年际分布比较稳定;一年中降雨量比较集中出现在4—9月,占全年降雨量的72%,峰值出现在7月份。②地表径流和地下径流与降雨保持密切的响应关系,在对降雨量的分配中,地表径流占30.7%,地下径流占15.2%。③楠竹林地的径流未来呈减少趋势。

Rainfall-runoff Process and Tendency under Different Time Scale in Phyllostachys edulis Forest Land

Phyllostachys edulis forest is a typical vegetation type of forest ecological system in Jinyun Mountain. In order to reveal the influence of vegetation types to rainfall-runoff process, the paper studies the observed hydrological datas of runoff plots in Phyllostachys edulis forest area in 2002—2007 period. The outcomes show that ①in 2002—2007 period, the inter-annual distribution of precipitation in Phyllostachys edulis forest is stable, the rainfall relatively concentrates in April to September, making up 72% of a whole year and the peak value showing in July. ②The surface runoff and underground runoff keep a close corresponding relationship with rainfall. In the distribution of precipitation, surface runoff makes up 30.7% and groundwater runoff is 15.2%. ③In the future, the runoff in Phyllostachys edulis forest region shows a downward trend.