黄土剖面土壤颗粒组成对土壤含水量的影响

土壤水资源是影响黄土高原土地利用和生态建设的重要因子,而土壤颗粒组成又是影响黄土高原土壤含水量的重要因素之一.为了分析黄土丘陵半干旱区深层剖面土壤颗粒组成对土壤含水量的影响.选择陕北绥德县境内的人工柠条林地和农地为研究对象,测定0-18 m土壤含水量及颗粒组成,分析深层土壤含水量与颗粒组成的关系.结果表明,人工柠条林耗水深度以下、农地3 m以下的土壤含水量主要受黏粒含量的影响,且土壤含水量与黏粒含量之间呈极显著的对数关系.人工柠条林在其耗水深度内,颗粒组成对含水量的影响不显著.

Influence of Soil Particle Composition on Soil Moisture in Loess Profiles

Soil water is an important factor to the land use and ecological construction on the Loess Plateau.Soil particle size can sig nificantly affect soil moisture.The purpose of this study was to determine the influence of soil particle composition on soil moisture in the sem-iarid area of the Loess Plateau. Caragana landand cropland were selected in Suide County, Shaanxi Province and soil moisture, as well as particle size,from surface to 18 m deep was tested. Results showed that soil moisture was significantly influenced by clay content below 3 m depth on cropland and below water consumption depth of caragana shrub. The relationship between soil moisture and clay content could be best simulated by logarithmic function. Within water consuming depth of caragana shrub, the impact of soil particle composition on soil moisture was not significant.