摘要
六盘山山区土壤中存在大量的石砾,对土壤大孔隙的形成具有重要影响。为了深刻了解和评价土壤中石砾对大孔隙形成的可能作用,本研究分析了六盘山典型植被类型下土壤中的石砾体积含量、大孔隙度变异以及石砾体积含量对大孔隙度、大孔隙半径与密度的影响。结果表明,石砾含量增加导致土壤大孔隙的平均半径和体积增大,特别是导致半径大于1.4 mm的大孔隙密度的增大,但对较小半径的大孔隙密度影响不大;总体上,石砾对土壤大孔隙度的形成影响随土深的增加而越来越明显,说明六盘山地区土壤的大孔隙明显同时受到生物因素和石砾含量因素的影响。
The occurrence of plentiful rock fragments embedded in the soil has a very important role in the formation of macmpore in the Liupan Mountains of Northwest, China. In order to＇understand and appraise the potential effect of rock fragment on the macropore formation deeply, the variety of the contents of rock fragments and macroporosity and their effects of rock fragments on the macroporostiy and the radius and density of macropore are studied in the Liupan Mountains and the results indicate that the increase of the volumetric content of rock fragment in the soil induces the size of macropores mean radius and the spread of volumes of single macropores, especially the increase of density of macropore with radius 〉 1.4 mm, but its content has very little effect on the density of macropores with radius 〈 1.4 mm. Generally, the effect of rock fragments on the macroporosity becomes higher and higher with increasing soil depth and we can conclude that the formation of macropore in the Liupan Mountains is affected evidently by the biological factors and rock fragments.
出处
《山地学报》
CSCD
北大核心
2007年第5期541-547,共7页
Mountain Research
基金
国家"973"项目(2002CB111501)
国家自然科学基金重点项目(30230290)
国家林业局引进国际先进技术项目(2003-4-43)
科技部社会公益研究专项(2004DIB3J102)
国家林业局森林生态环境重点实验室资助。~~
关键词
土壤大孔隙
大孔隙度
石砾
六盘山
soil macropore
macroporosity
rock fragment
Liupan Mountains
