太湖人工恢复湿地区植物群落建植对沉积物中氮、磷空间分布的影响

Influence of Plant Community in Artificial Wetland on Spatial Distribution of N,P in the Sediments of Taihu Lake

采用地统计学与GIS相结合的方法,以太湖百渎港湿地植被恢复区为研究区,研究了人工湿地植物群落沉积物中全氮、全磷和有效磷的空间分布特征,阐明了不同植物群落建植对氮、磷的拦截、沉积作用效果,以期为太湖水污染控制和湿地环境保护与修复提供科学依据。结果表明:(1)研究区全氮变化范围为0.37～5.42g/kg,全磷为1.01～9.06g/kg,有效磷为150～760mg/kg,全氮、全磷和有效磷都存在空间上中等程度的变异性。(2)芦苇群落对氮和磷的拦截、沉积效果最好,香蒲群落、茭草群落、荷花群落以及沉水植物群落由于受植物密度、分布位置以及自身生物学等因素的影响,表现出一定的差异性,但都强于分布植物较少的对照区。

Using geostatistical and GIS methods,a case study on the wetland plant community area in the Baidu port of Taihu lake was conducted to examine the artificial plant community for influence of spatial distribution of total nitrogen（TN）,total phosphorus（TP） and available phosphorus（AP） in the sediments.Interception and sedimentation effect of the different plant communities was illustrated to provide the scientific basis on Taihu Lake water pollution control and wetland environment protection and restoration.The results showed：（1）in the studied area,variation scopes of TN,TP and AP were 0.37～5.42 g/kg,1.01～9.06 g/kg and 150～760 mg/kg,respectively.They all had moderate variability in the space.（2）Phragmites australis community was the best for effect of intercept and sediment for N,P.Typha latifolia community,Zizania caduciflora community,Nelumbo nucifera community and the submerged plant community were different because of density,area of distribution and original biology characteristics.But they were the better than the contrasted area.