摘要
中国第二大淡水湖泊洞庭湖日趋萎缩。本文将洞庭湖地质环境系统看作构造沉积、泥沙淤积、围堤垦殖三个要素相互作用的有机整体。分析了三者对洞庭湖演变的贡献和相互作用关系，得出了洞庭湖事实上并未缩小而在扩大的结论。围堤垦殖使洞庭湖人为萎缩，形成今日劣化的人工—自然复合地质环境系统。文中提出了构建新的协调发展的人工—自然复合地质环境系统的构想。
Dongting lake is the second largest fresh water lake in China. The geological environmental system of the lake is an organic whole which compose of three interactive factors: tectonic subsidence, silt deposit and embanked reclamation. The mean annual tectonic subsidence is much larger than annual deposit in the same period. Embanked reclamation hasseparated the Dongting Lake into potential lake area (volume) and actual lake area (volume). Concentrating deposit in the latter speeds up the reduction of the actual lake area.Therefore, the current Dongting Lake geological environmental system is a poor humannatural compound system as a result of unreasonable interference from human activities. To reconstruct a new human-natural compound geological environmental system with coordinated development for the Dongting Lake is our pursued target.
基金
国家"八五"重点科技攻关项目
关键词
洞庭湖
地质环境系统
构造沉降
围堤垦殖
系统分析
Dongting Lake, geological environmental system, tectonic subsidence, embanked reclamation, system analysis
