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基于灰色系统的西北太平洋柔鱼冬春生群资源丰度预测
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摘要
柔鱼(Ommastrephes bartramii)是西北太平洋重要的经济头足类之一,科学预测柔鱼资源丰度有利于其合理的开发和利用。本研究结合1998-2008年北太平洋柔鱼生产统计数据和产卵场环境及其气候因子,使用灰色关联分析和灰色预测建模的方法,对产卵期内(1-4月)影响柔鱼冬春生群体资源丰度(CPUE)的产卵场环境以及气候指标进行分析,并建立柔鱼冬春生群体资源丰度的预报模型。灰色关联分析结果表明,产卵期内影响柔鱼冬春生群体资源丰度的因子依次是:3月份产卵场平均海表面温度(Average Sea Surface Temperature,SST)、1月份太平洋年代际震荡指数(Pacific Decadal Oscillatio index,PDO),4月份nino3.4指标和4月份平均叶绿素浓度(Average chlorophyll-a concentration,chl-a),以此建立柔鱼冬春生群体资源丰度预报模型。分析表明:不包含nino3.4距平的GM(1,4)模型有着较好的预测效果,其预测准确率在80%以上,可用于西北太平洋柔鱼冬春群体资源丰度的预测。
Neon flying squid(Ommastrephes bartramii) is one of the most important economic cephalopods in the Northwest Pacific. Scientific forecast to this squid is good for its exploitation and utilization. In this study, combining the fishing data of this squid in Northwest Pacific from1998 to 2008, we analyzed the relationship between the related environmental or climatic factors in its spawning grounds and the catch per unit effort(CPUE) of the winter-spring cohort, and therefore the CPUE forecast model was built. The grey correlation analysis showed that the most important factors affecting this squid CPUE is: Average Sea Surface Temperature(SST) in March,Pacific Decadal Oscillatio index(PDO) in January, nino3.4 index in April and average chlorophyll-a concentration(chl-a) in April. Based on this results, we established the CPUE forecast model of the Neon flying squid winter-spring cohort. Results suggested that the GM(1,4)model which did not include the nino3.4 anomaly had the best model effects. And its average absolute error was 19.2%.
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