The Content Of Pattern On Phosphorus And Its Burden Quantity Of Three Typical Riparian Forest Soil In Upstream Wenyu River

In this study, we take the upstream larch forest of Wenyu River in Kwan Tai Mountain, polar-birch and spruce forest, the three major riparian forest soil as the research object. And in each forest types set as three random block and five fertilization gradient each block. Through the field sample collection in the field and the parameters were measured of laboratory and date analysis, to analyze and compare about the phosphorus bearing capacity and dynamic of three riparian forest soil. Simultaneously, take correlation study about the phosphorus bearing capacity with soil bulk density, water content, pH, organic matter and total nitrogen content in soil, to investigate the influencing factors of the phosphorus bearing capacity in three major riparian forest soil.The following conclusions:(1) The three main riparian forest soil basic properties showed both the difference between types and obvious vertical differentiation. Overall surface soil bulk density and three soil water content were characterized by spruce forest<birch forest<larch forest, the soil pH is characterized by spruce forest<larch forest<birch forest, soil organic matter, available phosphorus and total phosphorus content is the largest in spruce forest, soil total phosphorus content in larch forest is higher than in that of Yang Hualin, the available p content in larch forest has little difference than in birch forest; Three kinds of riparian forest soil bulk density, water content, pH is increased with the increase of soil depth increase, soil total phosphorus content in surface layer is significantly higher than the middle and the lower, the difference between middle and lower level was not significant, differences between soil available p content in surface layer and the middle is not big, but they were significantly higher than the lower, among them, the larch forest surface and soil available p is significantly higher than the bottom, middle birch forest and spruce forest surface available p is significantly higher than the middle and lower level.(2) Three main riparian forest soil of basic properties and soil phosphorus content has a significant correlation which has a significant effect on the capacity of soil phosphorus. Organic matter and soil were very significant positive correlation with total phosphorus content and soil available p content, were very significant negative correlation with the soil pH. Soil total phosphorus content were very significant positive correlation with soil available p content.(3) Three kinds of riparian forest soil formed by different soil properties which leads to different phosphorus bearing capacity, in the third kind of riparian forest under the background of the same external input, birch forest reaching up to the maximum bearing capacity of available p,8.155mg/kg, and reaching up to the maximum bearing capacity of total phosphorus,0.618g/kg, though larch forest and spruce forest did not meet their bearing capacity.(4) Thre Three kinds of riparian forest soil phosphorus content in response to exogenous phosphorus input have different performance. Under the condition of the loading of inorganic phosphate (KH2PO4), total phosphorus content initially did not rise, after rising but overall showing a downward trend;at the beginning, available p content showed a rising first, then decreased. Three kinds of riparian forest middle is15-30cm of soil available phosphorus,its content change along with the change of seasons and exogenous input and the underlying strong in the surface. Three kinds of riparian forest soil total phosphorus and available phosphorus content of various levels increases with the increment of exogenous input, though it did not show significant difference between adjacent gradient content, the overall performance for the gradient between the phosphorus content shows the significant difference.(5) The riparian forest soil total phosphorus content significantly along with the change of season, and the trend of the change of the three layers are basically identical. Dynamic change in the months of the season, larch forest, in June when loading exogenous phosphorus800g is the fourth gradient,it reached the maximum capacity of total phosphorus in the soil, the bearing capacity is0.886g/kg. In July when loading exogenous phosphorus600g is the third gradient,it reached the maximum capacity of available p in the soil, the bearing capacity is20.671mg/kg. Load of total phosphorus in the spruce forest is fourth gradient in June(800g exogenous phosphorus fertilizer input), its bearing capacity is0.814g/kg. Load of available p in the spruce forest is fourth gradient in June(800g exogenous phosphorus fertilizer input), its bearing capacity is23.882mg/kg. In birch forest, the maximum load of total phosphorus in the soil was fourth gradient foreign phosphate (800g)in July, the bearing capacity is0.783g/kg. The maximum bearing capacity of soil available p appear in the fourth gradient in August when foreign phosphate is800g, the bearing capacity is18.271mg/kg.