近50年来人类活动对四湖地区河湖环境演变的影响

以四湖地区为研究区，分析了近50年来区域河湖环境的演变过程，以及农业生产、工业发展、水利工程建设、人口增长与城市化等人类活动因素对河湖环境演变的影响。得出：近50年来人类活动对河湖环境演变的影响逐渐加强，自然的影响因子退居次要的位置；人类活动的影响改变了四湖地区的水系结构，破坏了水域与周边环境协调的格局，促使河湖环境演变并产生功能失调，在一定程度上恶化了人类自身的生存环境；围垦和技术性蚕食是该区水系格局改变的主要原因；人口快速增长给四湖地区资源环境造成极大的压力，导致河湖环境恶化。

Effect of Human Activities on River-Lake Environment of Si-hu Area during the Past 50 Years

Human activities is the one of main driving factors of regional environment change in a short time, also is the focus and the advancing edge of global change study. In the paper, Si_hu area as the case study, analyzes the process of regional river_lake environment evolution, analyzes the effect of human activities on river_lake environment evolution from agricultural activity, industrial development, the construction of hydraulic engineering, population growth, advance stroke of urbanization during the past 50 years. It shows that human activities affects river_lake environmental evolution more and more with the development of economy and society, and the natural factors have become the nonessential ones. Human activities changed the drainage structure of Si_hu area, destroyed the harmonious status of water area and its surroundings, compelled the regional river_lake environment to change and bring environmental malfunction, worsen human's living environment to a certain degree in the last 50 years. The land accretion and the technical encroach are important reasons to regional environment change. The swift growth of population brings about the tremendous pressure for resources and environment of Si_hu area, and results in river_lake environmental deterioration.