长江下游地理信息系统的渔业资源生物多样性研究

Study on Biodiversity of Fisheries Resources in Yangtze River's Lower Reaches Based on GIS

根据2004年4～6月长江下游9个采样点的渔获数据，利用Shannon-wiener指数公式计算得到长江下游渔业资源的信息指数值．在GIS的支持下利用数据插值、分级、栅格图形加权平均和数学运算模型等空间分析方法对长江下游渔业资源生物多样性进行了综合的分析和评价．结果表明，南通以下江段渔业资源多样性指标的分级地位是比较低的，南通以上江段渔业资源多样性指标的分级地位相对较高．

Base on the data from nine sampled sites of Yangtze River＇s lower reaches from April to June in 2004, the biodiversity indexes of fisheries resources achieved from formula of Shannon-wiener were analyzed and evaluated synthetically by using the spatial analytical methods of data interpolation, reclassification, grid average weight and mathematic calculation model supported by Geographical Information System （GIS）. The results indicated that the biodiversity indexes of fisheries resources in the lower reaches of Nantong were inferior, and those in the upper reaches of Nantong were senior.