华容东湖围栏生态因子的灰关联分析

摘要

Based on space mathematical theory,according to the principles of normalization,symplectic symmetry,integrality,and accessibility,we calculated the gray system correlation degree for 12 ecological factors of net enclosure in Donghu Lake in Huarong County,Hunan Province,China.The correlation order of importance is as follow:total phosphorus ＞ total nitrogen ＞ phosphorus-nitrogen ratio ＞ ammonia nitrogen ＞ phytoplankton ＞ nitrate nitrogen ＞ pH value ＞ zooplankton ＞ water temperature ＞ transparency ＞ dissolved oxygen ＞ water depth,showing that total phosphorus,total nitrogen (including ammonia nitrogen and nitrate nitrogen),and phosphorus-nitrogen ratio were dominant factors in the lake during study.Analysis showed that the water quality in the pen was good,phosphorus-nitrogen ratio,and dissolved oxygen were suitable for plankton growth and proliferation,which is important to the natural-food cultivation for bighead fry and for the potential of increasing fishery production in the lake.%采用灰色系统关联度分析方法,以空间理论数学为基础,依规范性、偶对称性、整体性和接近性原则,计算并分析了华容东湖围栏12个生态因子的关联度,关联序结果为:总磷＞总氮＞氮磷比＞氨氮＞浮游植物＞硝酸氮＞酸碱度＞浮游动物＞水温＞透明度＞溶解氧＞水深.结果表明,总磷、总氮(包括氨氮和硝酸氮)和氮磷比是湖泊水体的优势影响因子.通过灰关联分析发现,围栏内水体水质良好,水体的氮磷比及溶解氧都适于浮游生物的生长繁殖,对围栏养殖鳙鱼苗种天然饵料的培育、增加渔产潜力都有重要作用.