主养青鱼池塘生态系统能量转换率的研究

Energy conversion efficiency of pond ecosystem cultivated mainly with black carp.

1985—1987年对苏州市郊区主养青鱼池塘生态系统的能量转换率进行了分析。结果表明,主养青鱼净产7.5、11.25、15t/ha 3个产量级型池塘青鲤团头鲂产出能占养鱼总产出能的比例分别为82.49、78.03、79.34％;总投入能(太阳辐射能+辅助能)转移到鱼的总产出能转换率分别为0.19、0.24、0.31％;太阳辐射能转移到毛和净初级生产力的能量转换率分别为0.76、0.90、0.96％和0.61、0.72、0.77％;净初级生产力转移到滤食性鱼净产量的能量转换率分别为4.02、4.63、5.27％;辅助能转移到鱼净产量的能量转换率分别为12.20、11.33。11.74％。在3个产量级型池塘中,以15t/ha产量级的能量转换率为最佳型。

The energy conversion efficiency (ECE)of pond ecosystem cultivated mainly with black carp(Mylpharyngdon piceus) at Suzhou suburb during 1985—1987 is analyzed. The results show that productions of black carp, common carp and bream carp are respectively accounted for 82.49, 78.03 and 79.34% of total energy output in the ponds with net production levels of 7.5, 11.25 and 25.15t/ha. The ECE of total energy input (including solar and supplementaty energies)converted into total energy output of fish is 0.19, 0.24 and 0.31%, and that of solar radiation energy converted into gross or net primary productivity is 0.76, 0.90 and 0.96％ or 0.61, 0.72 and 0.77% respectively. The ECE of net primary productivity converted into net production of filtering fishes is 4.02, 4.63 and 5.27%, and that of supplementary energy converted into net production of fishes is 12.20, 11.33 and 11.74％ respectively.Among the three ponds with different net production levels, that with net production of 15t/ha is an optimal one.