The Study On Physicochemical Properties Of Water And Sediment From Ecological Restoration Zone Of Chaohu Lakeshore

Lakeshore is one of the important wetland ecosystems. As an economic and safe repair measure, ecological restoration is used in restoration and reconstruction of lakeshore ecosystem more and more. Artificial higher aquatic plants not only improve the lake community with ecological systems, but also play significant role in controlling eutrophication water pollution.In this paper, we research Chaohu Lake lakeshore in Huilong Village, Changlinhe Town, Feidong Country. The structure of lakeshore in this study was seriously damaged by the local people anthropogenic activities (such as grazing, etc.). Lakeshore structure is not complete, and the distribution of plant community was fragmentary. Since 2008 the ecological restoration demonstration area has been established, tens of thousands of square meters of reed, cattail, wild rice and lotus and other aquatic plants planted in the region grew flourishingly. The ecological restoration zone development is fine. This issue through a year to continuously collect water and sediment of the ecological restoration zone, and analyse the quality of the water and sediment's physical and chemical properties. Compared with the natural state, this paper research the influence that the ecological restoration impacted on sediment's physical and chemical properties. At the same time, the phenomenon was researched that a large number of blue green algae were "captured" by plants of the ecological restoration zone after algae bloomed. This paper discussed the negative effects of blue algae decay to water quality in restoration area and the influence of water exchange obstruction to lakeshore sediment nutrient elements release. The main conclusions are as follows:(1) After "captured" by ecological restoration area, the blue algae decayed in it and played a negative role in improving water quality.In June, the water quality in ecological restoration area deteriorated, COD was 264.20 mg.L-1, TN was 18.30 mg.L-1, ammonia nitrogen was 7.00 mg.L-1, TP was 2.49 mg.L-1, soluble phosphorus is 0.56 mg.L-1, The water quality was worse than Gradeâ…¤. (2) Ecological restoration measures have improved the lakeshore sediment pollution situation. Comparing to the contrast area, in eco-restoration area sediments average content of organic matter decreased 18.5%, TN content decreased an average of 19.1%, TP annual average content decreased 29.2%.(3) The obstruction of lakeshore water exchange is not conducive to the release of nitrogen and phosphorus in lakeshore sediments. After June, under the conditions of water exchange obstruction, the sediment nitrogen and phosphorus content has a more substantial increase compared to the conditions of water exchange, in which nitrate showed a rising trend line.