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北京密云水库流域水源保护林区径流空间尺度效应的研究
引用本文:秦永胜,余新晓,陈丽华,刘松.北京密云水库流域水源保护林区径流空间尺度效应的研究[J].生态学报,2001,21(6):913-918.
作者姓名:秦永胜  余新晓  陈丽华  刘松
作者单位:1. 北京林业大学水土保持学院,
2. 北京市林业局水源保护林试验站,
基金项目:国家"九五”科技攻关专题(96-007-01-02)资助项目
摘    要:通过10a的森林水文定位观测,对比研究了北京密云水库流域水源保护林和对照荒坡地径流在坡面尺度(约0.9hm^2)和小流域尺度(约2.7hm^2)上的空间尺度效应。结果表明,荒坡地和水源保护林地的径流系数在坡面和试验流域尺度上与降雨量呈显著的对数相关关系;在坡面尺度和小流域尺度,荒坡地径流系数都显著地大于水源保护林地;而且随着降雨量级的增大,荒地与水源保护林地的径流系数之差在小流域尺度比坡面尺度更大;随着研究尺度从坡面到小流域的扩展,茺地径流系数显著增大,而水源保护林地的径流系数变化微小。这一尺度效应说明水源保护林对水文过程具有较大的调蓄能力,表现为较强的水源函养作用。

关 键 词:尺度  水源保护林  径流系数  密云水库
文章编号:1000-0933(2001)06-0913-06
收稿时间:2000/7/13 0:00:00
修稿时间:2001/1/10 0:00:00

Spatial scale effects of runoff on the water resource conservation forest watershed within the Miyun reservoir basin
QIN Yongsheng,YU Xinxiao,CHEN Lihua and LIU Song.Spatial scale effects of runoff on the water resource conservation forest watershed within the Miyun reservoir basin[J].Acta Ecologica Sinica,2001,21(6):913-918.
Authors:QIN Yongsheng  YU Xinxiao  CHEN Lihua and LIU Song
Affiliation:Key Lab. of Soil and Water Conservation Ministry of Forestry; Beijing Forestry University; Beijing; China
Abstract:By ten years field observation, this paper presents scale effects of runoff across two study scales on the controlled forestland and its comparative non forest land within Miyun reservoir basin. Results showed that the runoff rates of two land use logarithmically increase with the rainfall depth increased; the runoff rates of non forest land on the two scales are greater than those of forestland; furthermore, the difference of runoff rates between non forest lands and forestlands on the small watershed scales are higher than those of plot scales; with the increase of spatial scales from plot to small watershed, the runoff rates of forestlands increased far less than those of non forest lands. Thus, contrasting with non forest land, the water resources conserving function of the water resource conservation forest is very evident.
Keywords:scale  water resource conservation forest  runoff rate  Miyun reservoir
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