Abstract:

The paper,by examining the main water quality targets and collecting the columnar sample of the sediments,studied on the issue of nitrogen & phosphorus content and phosphatase activity at different depths in the zones with or without macrophytes growing in Lake Luoma,and explored the impact of macrophytes on nitrogen & phosphorus and phosphatase activity in the Luoma ecosystem.The results show that:(1) The transparency of the overlying water in the macrophytes growing zone is 19 times of that of the control area (CK),however,the Kjeldahl nitrogen (KN) and dissolved nitrogen (DN) in the grass area are lower than that of the control area (CK).Variance Analysis shows that the difference between the two areas is significant (〖WTBX〗p〖WTBZ〗≤001);(2) The growth of macrophytes can reduce phosphatase activity.Generally,the acid (alkaline) phosphatase activity of the sediments at different depths in the grass area is lower than that of the control area (CK),however,reaching the highest at the surface;(3) The phosphorus (TP) content of the sediments at different depths in the grass area is lower than that of the control area (CK),but the Kjeldahl nitrogen (KN) content in the surface sediment is higher than that of the control area (CK )