池塘底泥营养盐释放的室内模拟研究

Indoor Simulation Study on Nutrient Release of Fishponds Sediment

[目的]研究池塘底泥营养盐的释放特点和影响因素。[方法]采集佛山市养殖池塘A(当年新塘)和B(5年老塘)的底泥样品,在实验室条件下封口避光静置培养,每2 d取样分析1次N、P的释放情况。[结果]在试验前期B塘底泥的N释放明显大于A塘,而在试验后期A塘底泥的释放下降较为平缓。[结论]养殖池塘底泥中有机物的含量不会随养殖周期的延长而积累。NH4-N是池塘底泥N释放的主要形态;P的释放与N的释放呈现一定的相关性,PO4-P是底泥P释放的主要形态。

[ Objective ] The study aimed to research the nutrients release of ponds sediment. [ Method ] The sediments from a new fishpond （A） and an old one （B） were sampled and used to carry out indoor experiment under the anaerobic dark condition for researching on nutrient release. The N（ nitrogenous） and P（ phosphorous） release were analyzed every two days. [ Result] At the prophase, the N release in B was bigger than that in A, while the decline sediment release in A fishpond was gentle. [ Conclusion] There was no accumulation of organic compound during the breeding time, The NH4-N was the main form of N release ; and the P release was correlated with N release, while PO4-P was the main form of P release.