ON THE PRINCIPLES, SCALE DIVISION AND PROCEDURES OF COMPREHENSIVE CLASSIFICATION OF CHINESE LAKES
Dou Hongsheng Wang Sumin Jiang Jiahu Wang Xianchen(Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences. Nanjing 210008)
According to the research on lake classification, this paper gives an outline about the principles , scale division and procedures of lake comprehensive classification in China.1. Principles of lake comprehensive classificationThe combination of prevailing factors and comprehensive factors to establish the main criteria is the key to make well the high level classification in the lake comprehensive classification system. The correlative analysis between reginal similarities(relative consistency) and differen-cies is an important step to develop the low level classification of the system. In order to make the study of synthetic classification of lakes valuable both theoretically and practically, the effects of humen being's economic activities on natural factors of lakes must also be fully considered, such as water conservancy projects, reclamation, culture, water pollution, and so on.2. Scale division of lake comprehensive classificationHow many grades should be defined in the lake comprehensive classification system? The authors hold that it depends on the following aspects: the classification should reveal or reflect the integrated regional characteristics of the lakes and the systematic relation and interaction between geomorphological, hydrological, chemical and biological elements etc. ; it should make out the dynamic change and evolutionary trends in future; it should be simple and clear for practical applications.3. Procedures of lake comprehensive classificationThe procedures of the comprehensive classification could be divided into four steps which are relatively independent and intensively combinative, i. e. systematical data collection and occupation; mono-factor classification;, lake classification; theoretical explanation.