Assessment effects of cage culture on nitrogen and phosphorus dynamics in relation to fallowing in a shallow lake in China
Assessment effects of cage culture on nitrogen and phosphorus dynamics in relation to fallowing in a shallow lake in China
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DOI：
10.1007/s10499-008-9195-5
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发表时间：
2009-06-01
影响因子：
2.9
通讯作者：
Ni, Leyi
中科院分区：
文献类型：
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作者：
Guo, Longgen;Li, Zhongjie;Ni, Leyi
对中国某浅水湖泊网箱养鱼场的氮磷动态变化进行了研究。设置了四个采样点：笼下、笼侧、笼场以东50米和100米。对2年饲养周期内湖泊水体和底泥中总氮（TN）和总磷（TP）进行了分析。研究期间网箱养殖的鱼产量为16.3 ~ 39.2吨。根据质量平衡方程，全氮贡献1533 ~ 3084 kg，总磷贡献339 ~ 697 kg。氮、磷浓度在第一个培养周期的增加幅度大于第二个饲养周期。在研究期间，在笼子以东50和100 m的采样点未发现明显变化。主要撞击发生在笼子附近（笼子下方和笼子侧面）；笼侧采样点TN、TP沉降较高。休养3个月后，水体全氮和全磷含量显著降低，而沉积物全氮和全磷含量保持较高水平。因此，康复似乎发生在随访期间，但应注意培养是否在未来继续运作。
Nitrogen and phosphorus dynamics in relation to fallowing in a fish cage farm was investigated in a shallow lake in China. Four sampling sites were set: beneath the cages, at the cage sides, and 50 and 100 m east of the cage farm. Total nitrogen (TN) and total phosphorus (TP) in lake water and sediment were analyzed during a 2-year rearing cycle. The cage culture had a fish yield of 16.3-39.2 tonnes in the study period. Based on the mass balance equation, 1533-3084 kg TN and 339-697 kg TP were contributed to the lake environment. Nitrogen and phosphorous concentrations showed greater increase in the first culture period than in the second rearing cycle. No obvious changes were found at the sampling sites 50 and 100 m east of the cages during the study periods. Main impacts were found close to the cages (beneath the cages and at the cage side); the sampling points at the cage side showed relatively high TN and TP sedimentation. After 3 months of fallowing, water TN and TP decreased significantly but the sediment TN and TP contents remained high. Therefore, recovery seems to happen during fallowing but attention should be paid to whether the culture continues to operate in the future.