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黄土区坡面尺度不同植被类型下土壤干层的空间分布
引用本文:张晨成,邵明安,王云强.黄土区坡面尺度不同植被类型下土壤干层的空间分布[J].农业工程学报,2012,28(17):102-108.
作者姓名:张晨成  邵明安  王云强
作者单位:1. 西北农林科技大学资源环境学院,杨凌712100;西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌712100
2. 西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌712100;中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室,北京100101
基金项目:国家自然科学基金资助项目(41101204;41071156)
摘    要:为掌握坡面尺度不同植被类型土壤干层特征,对一典型坡面干层空间分布进行了研究。结果表明:13a杏树地和25a柠条地干层厚度分别在0~400和280~400cm之间,杏树地不同坡位处干层分布有明显差异;在坡面垂直方向上,25a柠条地较13a杏树地土壤水分亏缺严重。而水平方向,13a杏树地干层分布表现为明显的片状和斑块状分布特征,同时呈现出从北至南沿坡面逐渐递减,干层分布受植被,降水、坡位、微地形等因素共同作用。相比之下,25a柠条地干层分布结构性较为单一,干层厚度在381~400cm的面积分布较广且连在一起,表现出由植被控制的分布格局。相关结果可为黄土区土壤干层调控提供参考。

关 键 词:土壤  水分  植被  土壤干层  坡面尺度  空间分布
收稿时间:2/9/2012 12:00:00 AM
修稿时间:2012/4/10 0:00:00

Spatial distribution of dried soil layers under different vegetation types at slope scale in loess region
Zhang Chencheng,Shao Ming''an and Wang Yunqiang.Spatial distribution of dried soil layers under different vegetation types at slope scale in loess region[J].Transactions of the Chinese Society of Agricultural Engineering,2012,28(17):102-108.
Authors:Zhang Chencheng  Shao Ming'an and Wang Yunqiang
Institution:2,3(1.College of Resources and Environment,Northwest Agriculture and Forestry University,Yangling 712100,China;2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Northwest Agriculture and Forestry University,Yangling 712100,China;3.Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographical Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China)
Abstract:To understand the characteristics of dried soil layer(DSL) under different vegetation types at slope,the spatial distribution patterns of DSL on a representative slope were studied.The results showed that the extent of DSLs ranged from 0 to 400 cm for orchard(13 years of Prunus armeniaca) and from 280 to 400 cm for shrubland(25 years of Caragana Korshinskii kom),respectively,while slope position significantly influenced distribution pattern of DSLs in the orchard.In vertical direction,the depletion of soil water was more severe in shrubland than that in orchard.Horizontally,distribution of orchard DSL demonstrated obvious fleck and sheet characteristics and decreased gradually along north-south direction of the slope.Spatial pattern of DSLs in the orchard was controlled by vegetation,rainfall,slope gradient and micro-terrain.In contrast,the distribution pattern of DSL in shrubland was homogeneous that deeper DSLs(381~400 cm) distributed widely and combined together,implying that this pattern was only dominated by vegetation type.The results are helpful for DSL control and/or reclaim in loess regions.
Keywords:soils  moisture  vegetation  dried soil layer  slope scale  spatial distribution
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