The contents of organic matters, TN and TP in sediment layer from 0-20cm also decreased after 2 months of harvested, but NH/-N and NO3--N increased due to the amelioration of transperancy and aeration, which accelerated ammonification and nitrification.

• 2个月以后，收割区底泥0-20cm深度范围内有摘要机质、TN、TP含量明显下降，收割改善了湿地的通风、透气条件，促进了氨化和硝化作用的发生，使底泥中NH扩一N和N岛一N含量上升。