昆明地区红壤中Be-7分布研究

Distribution of Be-7 in Red Soil of Kunming Area

[目的]红壤中Be-7分布、含量的研究对示踪土壤侵蚀速率有重要意义,可为水土保持与环境保护提供重要的参考。[方法]通过Be-7示踪技术,对昆明地区红壤中不同土地利用类型的Be-7剖面分布及含量进行研究。[结果]Be-7主要分布于0～20 mm范围内,其中0～4、6～12 mm范围内Be-7含量较高。河漫滩、林地、耕地、荒草地等不同土地利用类型的Be-7分布存在一定差异,且不同类型的Be-7剖面分布不同。[结论]Be-7分布可能与土地植被覆盖率、土壤质地与机械组成有关。

[Objective] The research about the distribution and the content of Be-7 in red soil is important for tracing soil erosion rate,which could provide important reference for soil conservation and environmental protection.[Method]The Be-7 profile distribution and the areal activity density in different types of land use in red soil,Kunming area were studied with Be-7 tracer technology.[Result] Be-7 was distributed in the surfuce soil of 0-20 mm in depth.The higher Be-7 content was mainly distributed in 0-4 and 6-12 mm in depth.There were lots of difference about the distributions of Be-7 content among different types of land use,such as flood plain,wild grass ground,cultivated land,forest land and so on.And Be-7 profile distributions in different types of land use were different.[Conclusion] Distribution of Be-7 was related to land vegetation coverage,soil texture and mechanical composition and so on.