| 摘要: |
| 于1988-1990年在洪湖设6个剖面站位，对洪湖地区不同时期的垦殖剖面进行地球化学分析，并通过对沉积物层序间的21个元素的聚类分析，探讨垦殖剖面中元素的分布，地下水及垦殖对元素迁移的影响和再沉积作用与垦殖土壤的关系，指出由于湖泊区域性干演和垦殖过程的变化，导致沉积层序发生变化。这是人类垦殖活动对沼泽化湖泊产生影响的典型例证。 |
| 关键词: 垦殖 地球化学 地下水 沉积物 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，49070060号 |
附件 |
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| THE GEOCHEMICAL CHARACTERISTICS OF CULTIVATION PROFILES IN LAKE HONGHU |
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Yang Handong, Cai Shuming
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Institute of Geodesy and Gcophysics, Academia Sinica, Wuhan 430077
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| Abstract: |
| Chemical analysis of cultivation profiles taken in Lake Honghu from 1988 to 1990 showed that:
(1) Owing to luxuriant aquatic plant growth, some elements such as C, N and Ca are enriched in the surface sediment. The concentrations of nutrient elements reduce in the process of cultivation.
(2) Because of the high and frequent removal of the groundwater level in cultivation area, many elements such as Ca, Mg, Fe and Mn are removed. The loss of Ca is nearly 80%.
(3) In the evolution of the lake, Changes in cultivation and in dry and wet processes of the lake have altered the sedimentation processes, the order of sediment layers and the distribution of elements. |
| Key words: Cultivation, Geochemistry, Groundwater, Sediment |
