论文部分内容阅读
为了降低网箱养殖长吻鮠对水体的污染,探究环保型生态网箱,在网箱内种植了漂浮植物大薸。为探讨合理的收获策略,比较了几种不同收获方式对大薸生物量的影响。在收获频率分别为5 d、10 d、15 d和20 d,收获面积分别为20%、40%、60%和80%的条件下,以收获频率为5 d,收获面积为20%,收获的生物量最多,60d共收获大薸13655.2 g。不同收获方式对大薸的氮和磷含量以及干湿重均无显著性影响。移除氮和磷量最多的是收获频率5 d,收获面积20%的收获策略,60 d共收获氮和磷量分别为28.13 g和5.50 g,移除氮和磷量分别为26.62 g和5.06 g。移除氮和磷量最少的是收获频率10 d,收获面积80%的收获策略,60 d共收获氮和磷量分别为8.88 g和1.80 g,移除氮和磷量分别为7.37 g和1.37 g。收获频率5 d,收获面积20%的收获策略的氮和磷的移除量是收获频率10 d,收获面积80%的收获策略的3.61倍和3.69倍。
In order to reduce the pollution of water bodies caused by long-crested ichthyus breviculatus, we explored eco-friendly ecological cages and planted floating plants in cages. In order to explore reasonable harvesting strategies, the effects of several harvesting patterns on the biomass of Daphniphyllum macrophylla were compared. Under the conditions of harvesting frequency of 5 d, 10 d, 15 d and 20 d and harvesting area of 20%, 40%, 60% and 80%, respectively, the harvesting frequency was 5 d and the harvesting area was 20% The highest biomass, 60d were harvested a total of 13655.2 g. Different harvesting methods have no significant effect on nitrogen and phosphorus content, dry weight and wet weight of Pomfret. The most nitrogen and phosphorus removal were the harvesting frequency of 5 d and harvesting area of 20%. The total N and P uptake after 60 d was 28.13 g and 5.50 g, respectively, and the N and P removal were 26.62 g and 5.06, respectively g. The removal of nitrogen and phosphorus was the hardest harvesting strategy with harvesting frequency of 10 d and harvesting area of 80%. The total N and P uptake at 60 d was 8.88 g and 1.80 g, respectively, and the N and P removal was 7.37 g and 1.37, respectively g. The removal rates of nitrogen and phosphorus of the harvesting strategy with the harvesting frequency of 5 d and the harvesting area of 20% were 3.61 times and 3.69 times of the harvesting strategy with the harvesting frequency of 10 d and the harvesting area of 80%.