| 摘要: |
| 本文报道网围养鱼后湖泊底质中有机物、总氮和全磷含试增加的情況。因残饵、鱼粪 便和鱼分泌物等在湖体中的积累，经围养一年后，使底质中有机质、总氮和全磷分别增加48.81%、13，75%和22.22%；两年后分别增加70.63%、47.62%和25.00%；三年后分别增加90.18%、65.08%和30.56%；四年后分别增加116.86%、90.48%和55.56%。为了减少底质的营养负荷，建议：1.改良饵型；2.控制鱼种放养密度；3.及时清除死鱼；4.养殖与种植轮作。 |
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| DOI：10.18307/1990.0209 |
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| Analyses Of Sediments From An Experimental Area Of Pen Culture In East Taihu Lake |
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Sui Guirong
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Nanjing Institute of Geography & Limnology, Acadcmia Sinica
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| Abstract: |
| This paper reports the analytic result of the sediment sampled from an experimental area of pen fish-culture in East Taihu Lake. The contents of OM(organic material), TN(total nitrogen) and TP(total phosphorus) in the sediments within the enclosure increase respectively by 48.81%, 13.75% and 22.22% after pen culture for one year, by 70.63%, 47, 62% and 25.00% after two years, by 90.18%, 65.08% and 30, 56% after three years and by 116.86%, 90.48% and 55.56% after four years, as compared with contrast sediments, 20 meters far away from and out of the encircling gear, due to the accumulation of the remains of fish food and seretion. In order to decrease the nutrient load of the sediments in the enclosure net, four points are suggested as follows：1.The type of fish food should be changed. 2.The fish population in the enclosure should be controlled in a proper way. 3.Dead fish should be cleared away from the enclosure in time. 4.The pen culture and plant culture should be carried out alternately. |
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