六盘山叠叠沟小流域的土壤石砾含量坡面分布特征  

Distribution of Rock Fragment Content on Slopes in the Small Watershed of Diediegou of Liupan Mountains

作　　者：杜阿朋[1] 王彦辉[1] 管伟[2] 何常清[3] 于澎涛[1] 刘建立[4] 

机构地区：[1]中国林业科学研究院森林生态环境与保护研究所,北京100091 [2]中国林业科学研究院热带林业研究所,广东广州510520 [3]南京林业大学森林资源与环境学院,江苏南京210037 [4]北京林业大学水土保持学院,北京100083

出　　处：《水土保持学报》2009年第5期76-80,127,共6页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(40730631;40671038;30671677);科技部"十一五"科技支撑计划项目课题(2006BAD03A1803);科技部社会公益研究专项(2004DIB3J102);中国林科院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2007038;CAFRIF200702);国家林业局森林生态环境重点实验室资助项目

摘　　要：山区土壤石砾含量经常很高,这对土壤水文功能具有不可忽视的作用。为了解六盘山区土壤石砾含量的空间分布特征,在叠叠沟小流域调查研究了土壤石砾含量随坡向、坡位和土层深度的变化规律。结果表明,土壤(以表层0-20 cm为例)石砾体积含量的坡向顺序为阳坡(3.07%)>阴坡(2.89%)>半阴半阳坡(1.99%),坡位顺序为下部(3.46%)>中上部(3.05%)>坡顶(2.46%)>中部(2.20%)>上部(2.08%)。在受侵蚀影响导致表层土壤石砾富集的同时,石砾含量主要受离开母岩距离的影响,因而表现为随土壤加深而增加的趋势,基于此提出了不同坡向坡位时石砾体积含量随土壤深度变化的模型,与实际数据吻合较好。The content of rock fragment in slope soil of mountainous regions is often very high.This can not be neglected during analyzing the eco-hydrological functions of forest soil and ecosystems.In order to understand the spatial distribution of rock fragment content in the Liupan mountains,the variation of rock fragment content with slope aspect,slope position and soil depth was investigated in the small watershed of Diediegou.The results shows that the averaged volume content of rock fragment in soil（taking the top layer of 0-20 cm as example） between different slope aspects was in the order of sunny slope（3.07%） 〉shady slope（2.89%）〉 half-shady slope（1.99%）,and varied with slope position as down slope（3.46%）〉 middle-up slope（3.05%）〉 slope top（2.46%）〉 middle slope（2.20%）〉 up-slope（2.08%）.The soil depth distribution of rock fragment content was affected by both the soil erosion and the distance to bedrock.Firstly,the soil erosion led a relative enrichment of rock fragment in the surface soil layer;and secondly,the rock fragment content increased with soil depth.Based on this analysis,a model describing the variation of rock fragment content with soil depth under different slope aspects and slope positions was developed,and it agreed with observed data comparatively well.

关 键 词：六盘山 石砾含量 空间分布 土壤深度 

分 类 号：S152.32[农业科学—土壤学]