Characteristic Of Alkaline Phosphatase Activity Of Sediment In Lakes And Its Ecological Effect On Phosphorus

Alkaline phosphatase can catalyze organic phosphorus to release normal phosphate,accelerate phosphorus biology and chemical cycles, affect the load in inner lakes, thenaffect energy conversion and material cycle in aquatic ecosystems. This paper chosesLongfeng Lake and Panlong Lake in hebei as the research object, to research the expect ofseasonal dynamics, physical and chemical characteristics of water and large aquatic plantson the alkaline phosphatase activity, then we can get the following conclusions:1)Water temperature has greatest impact on the size of alkaline phosphatase activity,with some correlation (r=0.765, n=80, P <0.05); but pH and DO and the size of alkalinephosphatase activity was not obvious, is not relevant.2) Alkaline phosphatase activity which in surface sediment (0-3cm) size is closelyrelated with the degree of lake eutrophication, which can be used as direct indicator oflake eutrophication; but the depth of sediment of different studies have shown thatsediment base phosphatase activity is inversely proportional relationship between size andsediment depth.3) Seasonal effects have important expect on alkaline phosphatase activity, insummer and autumn, sediment size alkaline phosphatase activity than that in winter andspring large.4) The study of correlations between alkaline phosphatase activity of sediment sizeand sediment TP content have shown that Alkaline phosphatase activity at different depthsand different depth sediment sediment total phosphorus (TP) have some correlation, butthe minimum is in3~6cm sediments (r=0.776, n=10, P <0.01). the middle of sedimentwas layer in the sediments. Because the TP content in sediment not only have relation withthe level of nutrition, but also have relation with sediment microorganisms, whereas thealkaline phosphatase mainly from micro-organisms, therefore, there must be someconnection between the two.5) Aquatic Macrophytes have significantly inhibited expect on the alkalinephosphatase activity, and aquatic plants Macrophytes have a good purification to thelake.