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用15个上口面积为40m2,底部面积为20m2,深为1m的池塘,在相同的放养水平和投饲水平下,进行氮磷试验研究。本试验共设置五个处理:N/P=1,N/P=5,N/P=10,N/P=20,CK,每个处理设置3个重复。试验结果表明:试验中投放的饵料、肥料分别占氮总输入的30%~46.12%和37.81%~39.52%;占磷总输入的15.44%~74.74%和16.31%~79.12%。在支出项目中,鱼类的收获支出的氮磷占氮磷总输入的52.31%~75.95%和8.98%~40.39%;沉积在底泥中的氮磷分别占氮磷总输入的19.95%~36.3%和35.82%~86.52%;底泥中氮磷的渗漏占其总输入的1.49%~12.66%和1.09%~11.28%,其中氮的损失率对照最低为1.49%,N/P=20的损失最高为12.66%;磷的损失率N/P=10的处理最低为1.09%,对照为最高11.28%。
With 15 ponds with a catchment area of 40m2 and a bottom area of 20m2 and a depth of 1m, nitrogen and phosphorus were studied under the same stocking and feeding levels. In this experiment, we set five treatments: N / P = 1, N / P = 5, N / P = 10, N / P = 20, CK. The results showed that the feed and fertilizer were 30% -46.12% and 37.81% -39.52% of the total nitrogen input respectively, accounting for 15.44% -74.74% and 16.31% -79.12% of the total phosphorus input. In the expenditure items, the income from fish harvest accounted for 52.31% ~ 75.95% and 8.98% ~ 40.39% of the total input of nitrogen and phosphorus, respectively; the nitrogen and phosphorus deposited in the sediment accounted for 19.95% ~ 36.3% of the total input of nitrogen and phosphorus % And 35.82% -86.52%, respectively. The leakage of nitrogen and phosphorus in sediments accounted for 1.49% ~ 12.66% and 1.09% ~ 11.28% of the total input, of which the lowest was 1.49% for nitrogen loss and N / P = 20 The highest loss is 12.66%. The lowest phosphorus loss rate N / P = 10 is 1.09% and the highest is 11.28%.