Study On Comprehensive Utilization Of Plant Residues And Sediment From Wetlands Of Miju River Estuary

Will produce a certain amount of plant residues, due to the wetland system during operation, the aquatic plants in the wetland system metabolism and wetland systems of microorganisms, substrate, water physical, chemical and biochemical reactions to produce a certain amount of sediment. These plant residues and sediment carrying a certain amount of pollutants, if not promptly removed from the water, may be pollutants will re-enter the water body to cause secondary pollution, thus affecting the purification of the wetland system at the same time lead to resource waste. Therefore, to carry out the comprehensive utilization of debris and sediment in the wetland plants use to have a positive role to improve the purification effect of the wetland to improve the wetland resources.In this study, by using a dual-chamber composting heap technology for plant residues and sediment from wetlands of Miju River estuary as well as local livestock farming wastes. compost in five different proportionings was made to apply to the fields, control and conventional fertilization, compared before and after the study fertilization vegetable production, vegetable quality, soil fertility, soil rhizosphere microorganisms and the experimental field of surface runoff and underground seepage of nitrogen and phosphorus pollutants in the loss of influence, the study investigated six kinds program experimental field test results, and differences preferred wetland plant residues and sediment to field application effect the best fertilizer ratio. At the same time as the seasons changes on wetland plants and sediment nutrient analysis to identify wetland plant residues and sediment comprehensive utilization of a better state and time. According to the test results can reach the following conclusion:(1)Of aquatic plants in the wetland system organic matter, total nitrogen and total phosphorus content and the wet ground surface sediment physical and chemical nature of the indicators of pH, organic matter, total nitrogen, hydrolysis nitrogen, total phosphorus and available phosphorus content of a preliminary analysis and Dali climatic characteristics obtained six wetland plants are more appropriate for the harvest of autumn and winter, cattail harvesting of December, the remaining five plants in November. Wetland surface sediments from the sediment in autumn and winter release of pollutants to clear the right time for November. However, from the various indicators of the physical and chemical properties of the sediment concentration is not large; Wetland sediment removal is not necessarily an annual sediment accumulation and concentration magnitude.(2)Analysis shows that fertilization programs vegetable yield the highest increase in vegetable production effect is more pronounced, followed by Scenario B from the experimental field planting and autumn vegetable yield and quality of test results. Programs A, B, in the vegetable nitrate and nitrite contents were able to achieve national pollution-free vegetables; standard conventional fertilization F (application of inorganic fertilizers) can increase the accumulation of vegetable nitrate and nitrite, reducing the quality of the vegetables. Comprehensive analysis on the yield and quality of vegetables. Option A fertilization effect, followed by Scenario B.(3)Soil fertility before and after the experimental field fertilization data analysis shows that the fertilization program can enhance soil fertility, improve the performance of the soil for fertilizer, to ensure the production of vegetables.(4)Experimental field in the application of different options fertilizer experiments, testing is not planted before the soil samples and soil samples collected roots and autumn vegetable harvest the number of microorganisms obtained, the application of wetland organic fertilizer to reduce the harmful microorganisms in the rhizosphere soil of the number of fungi, increase the number of beneficial microorganisms actinomycetes and nitrogen-fixing bacteria effect, especially wetland organic matter and cow dung suitable mixing ratio (Option A and Option B) can improve the experimental field soil micro-environment.(5)Wetland organic fertilizer and conventional fertilization compared to wetland organic class fertilizer on soil nitrogen, phosphorus loss extent lighter, the result there is conducive to wet to organic class of fat in the Erhai Lake into Lake river basin of applications, especially Erhai Lake District, wetland plant residues body effective use of sediment. Groundwater N03-N content of a large impact on human health, and wetland organic fertilizer low nitrogen concentration of pollutants through percolation into the shallow water application of wet organic fertilizer can effectively protect the majority of agricultural growing areas around residents drinking water sources, and less by the loss of farmland nitrogen pollution.This article wetland organic fertilizer A fuller play to the role of consumer satisfaction on the wetland plant residues, to achieve optimum fertilizer ratio in this study. Its basis in the actual application which can also be appropriately increased10%to20%of the wetland sediment, and a corresponding reduction in the number of aquaculture waste. Fertilizer obtain the best results in accordance with Option A, if the conventional fertilization (F) replacement are available for the program A good economic and environmental benefits.