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引用本文:吕明辉,王红亚,蔡运龙,王文博,徐琳.贵州红枫湖HF1-2孔沉积物的磁性特征及其土壤侵蚀意义.湖泊科学,2008,20(3):298-305. DOI:10.18307/2008.0306
LV Minghui,WANG Hongya,CAI Yunlong,WANG Wenbo,XU Lin.Magnetic properties of core HF1-2 from Lake Hongfeng in Guizhou Province and its implications for soil erosion. J. Lake Sci.2008,20(3):298-305. DOI:10.18307/2008.0306
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贵州红枫湖HF1-2孔沉积物的磁性特征及其土壤侵蚀意义
吕明辉1,2, 王红亚1, 蔡运龙1, 王文博1, 徐琳1
1.北京大学城市与环境学院资源与环境地理系, 北京 100871;2.中国气象局国家气候中心, 北京 100081
摘要:
通过对红枫湖沉积物柱芯HF1-2磁性参数测量,总结出不同阶段沉积物磁性参数变化的特征,再结合137Cs、粒度、TOC(%)和C/N的分析结果,解译出红枫湖流域自1960-2003年的土壤侵蚀变化过程.从沉积物的分析得出,流域的土壤侵蚀经历了强弱交替的过程,两个明显土壤侵蚀增强的过程分别是1977-1980年和1987-1997年.初步探讨土壤侵蚀强烈的原因可能与降水量有关,但也明显存在着其它因素的影响.
关键词:  喀斯特地区  沉积物  磁性特征  土壤侵蚀
DOI:10.18307/2008.0306
分类号:
基金项目:国家自然科学基金重点项目(40335046)资助
Magnetic properties of core HF1-2 from Lake Hongfeng in Guizhou Province and its implications for soil erosion
LV Minghui1,2, WANG Hongya1, CAI Yunlong1, WANG Wenbo1, XU Lin1
1.Department of Resources, Environments and Geography, College of Environmental Sciences, Peking University, Beijing 100871, P.R.China;2.National Climate Center, CMA, Beijing 100081, P.R.China
Abstract:
Lake Hongfeng is a reservoir located in the center of Guizhou Province, which was built in 1960. A 35cm sediment core HF1-2 was sampled from the lake for analysis in 2004. Some mineral magnetism parameters such as SIRM, χlf, IRM20mT, χ ARM, Hard, χfd% are measured, furthermore HIRM, ARM/SIRM, IRM20mT/SIRM, ARM/χlf, SIRM/χlf are calculated from them. Based on magnetic measurements of the core, we can find the changes of magnetic properties influenced by soil erosion in the catchments during the past 43 years from 1960 to 2003. Combination with the results of analyses of137Cs, grain size, TOC(%)and C/N, we divide the changes of soil erosion in the drainage area into several periods during these 43 years, the most seriously soil-erosion periods are during 1977 to1980 and 1987 to 1997. Compared with the rainfall data, we find the precipitation, especially summer precipitation may be the major reason of soil-erosion during 1977-1980, and there are some other unknown complex factors to affect the serious soil-erosion during period of 1987 to 1997.
Key words:  Karst area  sediments  magnetic characteristics  soil erosion
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