The Characteristics Of Soil Infiltration And Dynamics In Spatial And Temporal Change Of Mineral Nitrogen During Degradation Process Of The Peat Wetland In Gahai

Peat is essential wetland system is an important part of the sea, in the global carbon cycle and play an important role in climate change. Soil permeability is one of the important indicators of evaluation of peat bog water conservation function, the mineral nitrogen is effective nitrogen can be absorbed by the plant directly used, its content and dynamic changes significantly affect the migration and transformation process of peat soil nitrogen. Peatland degradation process of soil permeability and mineral nitrogen variation characteristics, not only helps to understand the causes of peatland degradation, as well as degradation of peat to provide theoretical basis for the ecological restoration. This study essential sea wetlands of peat as the research object, through the peatland degradation process of soil infiltration characteristics, the research on the dynamic change of mineral nitrogen content, peatland degradation process of soil infiltration capacity and the variation characteristics of nitrogen nutrition library, to further grasp the peat of the change of soil degradation process. The results of the study are as follows:(1) In various layers of peat soil, peat soil infiltration rate under different degradation degree curves vary. Variation characteristics of soil infiltration rate curve surface soil is relatively regular, but along with the deepening of soil, soil infiltration curve is complicated. Among them, the deep soil permeability curve volatility is relatively stable, and middle soil permeability curve is the most complex.(2) The analysis of variance, and in the process of essential sea peatland degradation, not with the degraded soil infiltration characteristics in terms of vertical space difference significant(p < 0.05). Including 10 ~ 20 cm layer, soil infiltration characteristics with the degradation degree is "∽" form fluctuation; In the 20 ~ 40 cm layer, along with the degradation degree presents the law of diminishing step by step, and the degradation degree of difference between soil infiltration characteristics significantly. For the overall performance, surface soil infiltration characteristics in the most severe peatland degradation in the process of change.(3) Essential sea peatland shallow soil ammonium nitrogen content in the process of degradation is strongly influenced by the degree of degradation while the deeper soil is relatively small; In July when peat utilization rate of ammonium nitrogen content is relatively low, while in September 8, relatively high. At the same time, the different degradation degree of peat, mineral cultivation of undisturbed soil ammonium nitrogen content in peat soils under natural conditions. Compared with degraded peatlands, degradation of peat soil ammonium nitrogen in culture in the process of mineral, ammonium nitrogen content is influenced by outside conditions is minimal.(4) Soil No3-N content in peat degradation process in vertical space is not the same. Peatland degradation effect on shallow soil No3-N content is larger, the deep soil No3 –N content is relatively stable. Essential sea peatland nitrate in July when the vegetation utilization rate is higher, but with the passage of time and gradually reduced. In addition, the essential mineral is changed in the process of sea peatland degradation the original soil No3-N content of culture is strongly influenced by external conditions.(5) The essential sea peatlands in 0 ~ 60 d period, not in the degraded peatlands absorbed by plants directly using the mineral nitrogen mainly nitrate nitrogen, soil mineral nitrogen leaching quantity is less, in the process of the whole mineralization accumulation is more than consumption, nitrogen nutrition library appears is gained by accumulation. But as peatland degradation, peat soil nitrogen nutrition is absorbed by plants use is not only a nitrate nitrogen, ammonium nitrogen absorbed also use, but the relatively small amount of mineral n be used; Leaching amount increase gradually in the soil, the whole mineralization accumulation during the process of gradually less than consumption, appeared negative accumulation. The study area in the new degraded peatland areas, but with time was in a state of rapid decline.(6) Essential sea peat soil structure change in the process of degradation, soil permeability gradually decreased, soil mineral nitrogen content gradually decreased, soil mineral nitrogen leaching.