鹫峰地区土壤结构及水分运移能力随海拔梯度的变化  

Soil Structure and Water Transport Capacity at Different Altitudes in Jiufeng Area

作　　者：孟晨[1] 牛健植[1] 武晓丽[1] 杜晓晴[1] 骆紫藤 

机构地区：[1]北京林业大学水土保持学院水土保持与荒漠化防治教育部重点实验室,北京100083

出　　处：《水土保持通报》2016年第1期106-109,114,共5页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目"林木根系对溶质优先运移影响机制研究"(41271044)

摘　　要：[目的]分析土壤性质及饱和导水率与海拔之间的关系,为该地区的土壤性质及土壤导水性能的空间异质性提供参考。[方法]用环刀分层取样对北京市鹫峰低海拔地区不同海拔的6块样地进行土壤性质测定,并进行水分穿透试验。[结果]鹫峰低海拔地区土壤密度、总孔隙度及0.25水稳性团聚体与海拔之间无相关关系;土壤含水率及石砾含量均表现出与海拔极显著的相关关系,其中土壤含水率随海拔的升高而升高,石砾含量随着海拔的升高而降低;大孔隙密度及饱和导水率与海拔呈现较显著的相关性,其中0—20cm土层土壤大孔隙密度与导水率随着海拔的升高而升高,40—60cm土层土壤则表现出土壤大孔隙密度及饱和导水率随着海拔的升高而降低的规律。[结论]海拔梯度与土壤性质密切相关,在今后对土壤结构及水分运移能力的研究中不能忽略海拔对其的影响。[Objective]We aimed to analyze the relationships between soil properties and saturated hydraulic conductivity and altitude in order to provide the reference for soil properties and spatial heterogeneity of soil water proerties in the study area.[Methods]The ring knife was used to collect soil samples in six different sampling plot in Jiufeng low altitude area of Beijing City.Soil properties were analyzed and water penetration was surveyed.[Results]No significant correlation have been found between soil bulk density,total porosity and0.25 water stable aggregates and altitude.The soil water content and gravel content showed a significant correlation with altitude.Soil water content increased while gravel content decreased with the increase of altitude.There was a significant correlation between high pore density and saturated hydraulic conductivity and altitude.In the 0—20cm soil layer,macropore density and water conductivity increased with the increase of altitude.In 30—60cm soil layers,macropore density and water conductivity decreased with the increase of altitude.[Conclusion]The effects of altitude on soil structure and water transport capacity is odvious,it should not be ignored in the future studies.

关 键 词：海拔 土壤含水率 土壤结构 孔隙度 石砾含量 土壤饱和导水率 

分 类 号：S152.4[农业科学—土壤学]