摘要
探讨了围网养殖对水生植被和沉积物再悬浮的影响,结果表明,养殖破坏水生植物资源,使生物量由532 g·m-2下降至45 g·m-2,围栏内的优势种被迫食种代替;沉积物再悬浮显著增强,试验期间,沉积物TP释放增加了336 mg·m-2。保持300 g·m-2的最低生物量对维持湖泊生态系统良性循环、降低再悬浮有重要意义。
The effect of enclosure aquaculture on aquatic vegetation and sediment resuspension was performed through field experiments. The result showed that the aquatic macrophytes resource was exhausted by over-farming. The biomass reduced from 532 to 45 g·m^-2, and the dominant species were replaced by uneatable species. Sediment resuspension was increased. More than 336 mg·m^-2 of TP was brought into water comparing with control stand. Preserving 300 g ·m^-2 biomass was essential to maintain the system in good cycle and to restrain resuspension.
出处
《湖北农业科学》
北大核心
2007年第4期556-558,共3页
Hubei Agricultural Sciences
基金
国家"973"项目(2002CB412300)
中国科学院知识创新工程重要方向项目(KSCX2-1-10)
国家自然科学基金项目(03050351)
关键词
围网养殖
水生植被
沉积物再悬浮
enclosure
aquaculture
aquatic vegetation
sediment resuspension
