摘要
土壤物理性质在一定程度上决定了土壤层的水文特征,而不同植被类型对于土壤物理性质的改造会导致不同区域土壤层蓄水保土功能表现出较大差异。以祁连山黑河流域上游的天老池小流域为研究区域,研究青海云杉、祁连圆柏、亚高山草甸、灌木和干草原5种植被对于土壤物理性质的影响。结果表明:(1)青海云杉林土壤的容重最小,孔隙度最大,颗粒组成主要以粉粒为主。干草原和草甸草原土壤的容重最大,孔隙度最小;同一种植被类型在不同坡位的容重和总孔隙度大小具有较好的一致性,各植被类型上中下坡位均表现出随土壤深度的增加容重增大,总孔隙度减小的趋势。(2)研究区草甸草原0—20cm的土壤物理性质具有相似性,20—50cm土壤层的物理性质具有较高的一致性。
Soil physical properties,to some extent,determine the hydrological characteristics of soil layers.The influences of different vegetation types on soil physical properties can significantly change the functions of soil and water conservation in soil layers of different regions.We discussed the effects of different vegetation types on soil physical properties in Tianlaochi,a small watershed located in the upstream of Heihe River basin.An experiment was carried out under the five vegetation types of Picea crassifolia,Sabina przewalskii,subalpine meadow,shrubs and steppe.Results show that（1）Picea crassifolia had the minimum soil bulk density and the largest porosity.Particles were mainly composed of silt.Steppe and meadow steppe had the highest soil bulk density and the minimum porosity.For the same vegetation types,soil bulk density and total porosity were consistent at different slope positions.With the increase of the depth,soil bulk density increased and total porosity decreased.（2）In meadow steppe,physical properties of the 0—20cm soil layer were similar,and physical properties of the 20—50cm soil layer were with greater consistency.
出处
《水土保持通报》
CSCD
北大核心
2013年第3期13-17,99,共6页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金重点项目"黑河上游森林草地生态-水文过程的相互作用机制研究"(91025015)
关键词
土壤容重
总孔隙度
机械组成
黑河上游
植被类型
soil bulk density
total porosity
mechanical composition
the upper stream of Heihe River
vegetation type
