摘要
基于 1 997年 7月中日合作副热带环流调查的资料 ,运用模糊数学原理对琉球群岛岛链两侧副热带环流水域的海洋浮游植物多样性程度进行了模糊综合评判 ,界定了各浮游植物多样性指数的阈值评判集合。结果表明 ,此海域浮游植物的多样性程度是属于高的。用相同的多样性指数阈值评判集合对调查海域的浮游硅藻和甲藻分别进行多样性程度的模糊综合评判 ,结果表明浮游硅藻和甲藻的多样性程度评判结果有不同程度的下降 ,表明不能用与浮游植物相同的评判集合对同一群落的硅藻和甲藻分别进行评判。Shannon Weaver指数较适合于浮游植物多样性的模糊综合评判 ,但必需同其他多样性指数结合使用。
Based on the phytoplankton diversity data from the China-Japan joint investigation in subtropical circulation waters in summer 1997,and with the principle of Fuzzy Mathematics,the fuzzy evaluation is given on marine phytoplankton diversity around Ryky-gunt and its adjacent waters(23°30′N_29°30′N,122°30′N_130°30′E). Netzphytoplankton samples from 42 grid stations were analyzed. Phytoplankton diversity indexes such as species abundance (S),Margalef spices richness (d Ma ),Shannon-Weaver diversity index (H′),Simpson diversity index (D) and Pielou even index (J) are calculated and are taken as evaluation index. The phytoplankton diversity is determined by 5 grades:very low,low,normal,high and very high. The grade criteria to every evaluation index are given. The evaluation set of different diversity indexes has established for phytoplankton diversity fuzzy evaluation. The value of subordinate degree of evaluation indexes is determined for the stations. All the values of subordinate degree are composed of a fuzzy relationship matrix R(5,5). The given weight make up a vector A(1,5) according to the importance and reliability of evaluation index. Shannon-Weaver diversity index (H′) is chosen as the most important one. The fuzzy equation is calculated by Tsukamota method for validating the given weight. According to the maximum subordinate degree principle,the fuzzy evaluation set is calculated as a fuzzy vector B=AR by M arithmetic operators. The result shows that the phytoplankton diversity is high in the survey area. The same evaluation set is used for planktonic diatom and dinoflagellate fuzzy evaluation in the same survey area. However,the result is lower than that of phytoplankton fuzzy evaluation. This shows that it is not suitable to judge different phytoplankton groups by the same evaluation set. Although the Shannon-Weaver index is the best according to the discriminating methods,it should be connected with other“information content” base diversity indexes in fuzzy evaluation.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2001年第4期445-453,共9页
Oceanologia Et Limnologia Sinica
基金
中日合作第二次副热带环流调查项目
国家自然科学基金项目 4 967630 4号
国家基础研究与重点项目 G1 9990 4 370 3号
