| 王俊娜,李翀,段辛斌,廖文根.基于遗传规划法识别影响鱼类丰度的关键环境因子[J].水利学报,2012,43(7): |
| 基于遗传规划法识别影响鱼类丰度的关键环境因子 |
| Identification of significant environmental factors affecting fish abundance by genetic programming |
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| DOI： |
| 中文关键词: 遗传规划法 鱼类丰度 关键环境因子 四大家鱼 涨水的持续时间 涨水的日均涨水率 |
| 英文关键词: genetic programming fish abundance significant environmental factors the four major Chinese carps duration of flow increase average daily rate of flow increase |
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| 中文摘要: |
| 以长江中上游四大家鱼为例，采用遗传规划法，从水文、水温、泥沙、气象等方面定义的15个环境因子中，识别出影响四大家鱼鱼苗丰度的关键环境因子，并分析了鱼苗丰度随关键环境因子的变化趋势。研究结果表明：自然条件下，涨水的持续时间和日均涨水率为影响鱼苗丰度的关键环境因子；鱼苗丰度与涨水持续时间之间存在非线性递增关系，且涨水持续时间在5~8d 时，鱼苗丰度随之显著增加；日均涨水率低于2 000（m3/s）/d 时，鱼苗丰度与日均涨水率之间呈现近似线性递增关系，而日均涨水率高于2 000（m3/s）/d时，由于监测数据较少，尚无法确定二者的关系。对比相关分析法、多元线性回归法和人工神经网络法，遗传规划法在识别与生物因子存在非线性关系的关键环境因子，并建立它们之间的量化关系方面具有显著优越性。 |
| 英文摘要: |
| Environmental factors affecting larval abundance of the four major Chinese carps in the middle and upper reaches of the Yangtze River can be classified into four categories： meteorology， hydrology，water temperature， and sediment concentration. Out of total 15 environmental factors， the authors， by using genetic programming， identified the two most significant factors： the duration （Tdur） and the average daily rate （Qrtav） of flow increase. With a non-linear correlation， the larval abundance increases significantly with Tdur when Tdur is within 5 to 8 days. With an approximately linear correlation， the larval abundance increases with Qrtav when Qrtav<2 000（m3/s）/d. Field data are not sufficient to support any conclusion when Qrtav>2 000（m3/s）/d. Compared to other quantitative correlation analyses such as multiple linear regression and artificial neutral network， genetic programming has advantages in dealing with a large number of nonlinear factors especially when their affecting mechanisms are not clear. |
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