大型水生植物对骆马湖氮磷元素及磷酸酶活性的影响

EFFECT OF MACROPHYTES ON NITROGEN,PHOSPHORUS AND PHOSPHATASE ACTIVITY AT THE LAKE LUOMA

在骆马湖中选择有大型水生植物生长区域及无草对照区,测定主要水质指标,采集沉积物柱状样,分层测定沉积物氮磷元素含量及磷酸酶活性,探讨大型水生植物对骆马湖生态系统中氮磷元素及磷酸酶活性影响特征,结果表明:(1)大型水生植物生长区上覆水透明度明显高于对照(CK),是对照(CK)1.9倍;但有草区凯氏氮(KN)、可溶性氮(DN)含量低于对照(CK),方差分析表明二者差异极显著(p≤0.01);(2)大型水生植物生长能降低磷酸酶的活性,有草区不同深度沉积物酸(碱)磷酸酶活性总体小于对照(CK),但沉积物表层磷酸酶活性最强;(3)有草区不同深度沉积物TP含量低于对照(CK),但有草区表层沉积物凯氏氮(KN)含量高于对照(CK)。

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（p≤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）.