摘要
砾石广泛存在于土壤中。砾石含量和砾石大小随坡度呈增加的趋势,并受到岩性和耕作措施的影响;土壤表层的砾石含量和坡度存在着直线、对数或指数的关系;砾石土/砾质土的水分含量与砾石含量、砾石的来源、大小、孔隙度以及砾石在土壤中存在的位置有关;表土的砾石能增大土壤渗透率、延迟地表积水和径流形成,降低表土水分蒸发,进而减少了土壤和水分的损失。土壤中的砾石不仅改变了土壤的物理特性和化学特性,影响了土壤农学特性,而且制约了一系列的土壤过程。
Rock fragments are widely founded in soils of whole world. The contents and size of rock tragments are increased with the slope gradient, and are influenced by the Lithology itself and tillage practices. There are linear, exponential, and logarithm relations between contents of rock fragment in topsoil and the slope gradient. The water contents in soils containing rock fragments are associated with origin, content, size, and porosity of rock fragments and its position in the soil profile. The rock fragment of topsoil can reduce loss of water and soil by increasing soil infiltration, retarding runoff＇s formation and decreasing soil water evaporation Therefore, the presence of rock fragments not only modifies the soil physical and chemical properties and the agronomical characteristics, but also restricts a series of soil processes.
出处
《中国农学通报》
CSCD
2006年第5期271-276,共6页
Chinese Agricultural Science Bulletin
基金
重庆市科技攻关资助项目"三峡库区荒溪治理优化模式及决策支持系统构建"(027418)。
关键词
砾石
砾石土
土壤侵蚀
土壤水分
Rock fragment, Soil containing rock fragments, Soil erosion, Soil water
