摘要
通过在小流域坡面上进行的实地磁测、室内组分分离、组分磁测及坡面土壤侵蚀磁性示踪试验,对坡面不同空间部位土壤的磁化率特征和降雨后土壤磁化率变化的机理,以及利用磁性示踪法来研究坡面土壤侵蚀的可行性进行了探讨,结果表明,坡面土壤磁化率以上坡磁化率最低、中坡最高、下坡居中;土壤不同粒径组分磁化率与粒径大小存在密切联系,土壤不同粒径组分中以粒径在0.1～0.25mm的组分对土壤磁化率影响最大;在降雨后不同坡位土壤磁化率均发生变化,其机理是由于土壤遭到侵蚀后粒级组成发生变化,从而造成磁性矿物的含量发生变化,进而引起了土壤磁化率的改变;利用磁性示踪法来研究坡面土壤侵蚀是一个行之有效的方法。
The character of soil magnetic susceptibility in the different parts of the slope, the mechanism of soil magnetic susceptibility changing after rain, and the feasibility of using magnetic tracer to study soil erosion are discussed based on the measurement of soil magnetic susceptibility in the slope, the desperation of different particle diameter range soil, and magnetic susceptibility measurement of different particle diameter soil, and using magnetic tracer to study soil erosion in the slope of a small watershed. The results of the experiment show that the soil magnetic susceptibility in the upper part of the slope is the lowest, the soil magnetic susceptibility in the middle part of the slope is the highest, and the soil magnetic susceptibility in the lower part of the slope is medium. The magnetic susceptibility of the separate whose particle diameter range is 0.1～0.25 mm is highest, the relationship between the magnetic susceptibility of this separate of the soil and the soil magnetic susceptibility is very significant. After raining, the soil magnetic susceptibility of the different parts of the slope changed much,its mechanism is that the magnetic mineral content of the soil in the slope changed after the soil eroded. The results of the tracing experiment show that the method of using magnetic tracer to study soil erosion in the slope is effective too.
出处
《水土保持学报》
CSCD
北大核心
2004年第6期21-26,共6页
Journal of Soil and Water Conservation
基金
山东省自然科学基金(Y2001D01)
关键词
坡面侵蚀
土壤磁化率
磁性示踪
试验
slope
soil eroded
magnetic susceptibility
magnetic tracing
