Abstract: Soil nutrient and heavy metal contents in wetlands under different land-use patterns were analyzed and the index of soil heavy metal pollution and the potential ecological risk index were calculated to assess the effects of landuse patterns on soil ecology and environment in Longwo Lake of Wuhu City. The results showed that landuse patterns had significant effects on soil nutrient and heavy metal contents in the wetlands. In general, soil nutrient and heavy metal contents in net fishery wetland (NFW), pond fishery wetland (PFW), rubbish dumping wetland (RDW) and ditch wetland (DW) were significantly higher than in farming wetland (FW) and lake wetland (LW). All wetlands were seriously or very seriously polluted with Cd and moderately polluted with Cu, while NFW, PFW, DW, RDW, and DW were moderately polluted with Pb and Zn. Only soil Cd contents in NFW, PFW, and RDW seriously exceeded the second level of soil quality standard in China (GB 15618-1995). Integrated pollution indexes indicated that RDW, NFW, and PFW were exposed to serious heavy metal pollution and DW, FW, and LW were exposed to moderate heavy metal pollution. Integrated potential ecological risk indexes indicated that RDW, NFW, and PFW had a very serious potential ecological risk and DW, FW, and LW had a serious potential ecological risk, mainly due to the high potential ecological risk of Cd with contribution of 88.6%-96.2%. Fishery and rubbish dumping were the main sources of soil nutrient and heavy metal pollution. Soil nutrient and heavy metal pollution had a coupling relationship in the studied region.

Key words: fine root, nitrogen use efficiency., bareroot seedling, nitrogen metabolism, gel