摘要
土壤水分动态变化研究在岩溶石漠化地区生态恢复和重建过程中具有重要意义。根据坡位和季节的不同,通过24组样品分析了土壤水分空间分布特征及变异性。结果表明:表层土壤水分沿上坡向下具有不断减小的变化趋势,坡面土壤水分呈中等变异,不同坡位间的差异不大,坡顶和坡底土壤含水量较高,与坡地相比,坡底受外界条件的干扰相对较小;与坡位相比季节对岩溶土壤水的影响相对较大,在雨季来临时土壤水分的变异系数突然变大,随着雨季的延续变异系数逐渐变小,到雨季末期达到最小,其含水量在4-8月之间达到最大,其变化幅度总体与降雨量呈正比。
Dynamic changes of soil moisture in the karst areas desertification ecological rehabilitation and reconstruction process is of great significance.According to the slope at different seasons and through the 24 samples,the spatial distribution of soil moisture and variability are analyzed.The results showed that：surface soil moisture has a constant trend of decrease along the slope,and the moderate variation on the slope,but the difference of different slope is little.Soil moisture is higher at the slope bottom and top.Compared with the slope land,the seasonal impact on slope bottom soil is relatively smaller.The seasonal impact on the karst soil relatively large in the slope position and soil moisture coefficient of variation suddenly become larger in the rainy season,then became smaller with the continuation of the rainy season and reached the minimum at the late rainy season.The water content reached the largest value during April to August and the overall magnitude of changes with the rainfall submissions are proportional.
出处
《水土保持研究》
CSCD
北大核心
2009年第2期156-159,共4页
Research of Soil and Water Conservation
基金
国家973计划专题(2006CB403204)
贵州省省长基金(黔省专(2007)089)
贵州省科技计划项目(黔科合计省合[2006]4001,黔科合S字[2007]1018,院所创新[2008]009)
省重大专项(黔科重大专项合计[2006]6014)
关键词
岩溶石漠化地区
土壤水分
动态变化
变异系数
karst regions
soil moisture
dynamic changes
coefficient of variation
