湖泊和水库营养分类的研究

STUDIES ON A TROPHIC CLASSIFICATION OF LAKES AND RESERVIORS

根据我国实际情况,并参考国外对湖泊营养分类的标准,建立了湖泊和水库FTE营养分类方法。应用Fuzzy综合评判的理论和方法,对参加分类评判的各项指标参数通过映射的方法,使每一个指标参数转换成在区间[0,1]的特性指数(d_1),同时引入一个能反映每项指标参数在评判中重要程度的权值(a_1),求得一个能统一反映湖库营养程度的综合性评价指数的计算公式:e=∑a_1d_1。以何志辉教授对我国87个湖库营养分类结果为基准,计算并确定出贫、中、富三种营养类型互不相交的FTE指数范围,作为湖库FTE营养分类标准。对任一湖库,根据九项指标参数计算获得的FTE指数e,不仅能客观地反映其营养程度,同时又以它作为唯一的数值来确定该湖库的营养类型的归属。用FTE营养分类方法对我国87个湖库营养分类结果与何氏的分类结果吻合率达97.7％。

In this paper the method of FIE (Fuzzy total evaluation) trophic classification was created based on the practical condition of our country and made reference to the classification standards of foreign lakes.The writer, with applying the theory and method of Fuzzy total evaluation, used the transformation function to transform each index parameter to be used to classify into a feature index (di) within an interval 10,11, and mean while, gave each index parameter a weight (ai), which can show the important degree in the tropic classificaion, and found a calculation formula of total evaluation index, which can unitively show a trophic degree of a lake or a reservior, e=∑aidi, where e is FTE index (a dimensionless value), ai a weight (0≤ai≤l and∑ai=1), di a feature index and di∈ 10,11, n the number of classification indices paramet ers (in this paper n=9). Considering he zhihui 's classification results of 87 lakes and leserviors in our country as an basic standard, 3 indices scopes not to cross each other among oligotrophic, mesotrophic and eutrophic type were calculated and decided. They are as the standard of FTE trophic classification of lakes and reserviors. To any lake or reservbr, FTE index e, which is calculated basged on its 9 indeces parameters, both shows its trophic degree objectively and is regarded as an unique value that decides the trophic type of the lake or the reservior. The correct rate of the classification results of 87 lakes and reserviors in our country using the method of FTE trophic classification to ones of he's comes up to 97.7%. The method has a quite important meaning to classify lakes and reserviors in trophic degree and to evaluate unitedly the productive forces of organism of lakes and reserviors in our country.