Spatial Variability Of Soil Nitrogen In Ebinur Lake Wetland

Arid wetland ecosystem and desert ecosystem very fragile, Soil Nutrition(mineral elements) extremely poor, Nitrogen content is low, Soil Nitrogen is considered to be second only to organic matter and moisture factors that affect plant growth and development, but also due to various geographical, meteorological climatic conditions and human impact and control the distribution of Nitrogen is special. Therefore, studies of soil Nitrogen distribution in arid zone wetland system are significant to reveal the distribution of soil Nitrogen in arid areas, desertification, Soil salinization, the spatial distribution of vegetation, biodiversity become less, ecosystem evolution and Nitrogen accumulation, Nitrogen cycle process. In this study, through the determination of the Ebinur Lake wetland Soil Nitrogen content, analysis the wetland soil nitrogen statistical characteristics, characteristics of spatial distribution and spatial variability of Ebinur Lake wetland under different vegetation types to discuss influential and control factors of spatial variability of Soil Nitrogen on Ebinur Lake wetland.The main conclusions are as follows:(1) Soil total Nitrogen, available Nitrogen, organic carbon, available phosphorus and available potassium average contents in the study area are decreasing with the increasing of the soil depth, this trend reflecting that bioaccumulation and accumulation role in topsoil significantly affect the content of every index in soil.(2) The coefficient of variation of total Nitrogen also decreasing with increasng of soil depth. Nitrogen variation coefficient 0~20cm>40~60cm>20~40cm>60~ 80cm>80~100cm.(3) After the logarithmic transformation of original data of soil total Nitrogen, available Nitrogen and every indicators content, K-S test results shows that the asymptotic two-tailed probability(PK-S) is greater than a given significance level 0.05, in line with normal trend.(4) Selected the Saline meadow, Microphanerophytes desert, Desert shrub, Dry lakebed, Desert riparian forest, Halophyte shrub, Alpine coniferous forest and other natural plot in the study area, analyze the distribution characteristics of Soil total Nitrogen and available nitrogen in each plots, the results shows that: with the increase of soil depth, soil total nitrogen content decreased, but there are obvious differences between the different types of vegetation affected profile distribution of soil Nitrogen. Soil total Nitrogen content in high and low order is Alpine coniferous forest> Microphanerophytes desert> Desert shrub > Dry lakebed > Desert riparian forest > Halophyte shrub > Saline meadow, Soil Nitrogen content under the different vegetation types belong to the lack type; availabale Nitrogen contents are also decreased with the increasing of soil depth, content in high and low order Alpine coniferous forest> Saline meadow > Desert shrub > Microphanerophytes desert >Desert riparian Forest>Halophyte shrub>Dry lakebed. On the whole, Soil total Nitrogen, available Nitrogen content in different vegetation types belong to the lack of type.(5) After the logarithmic transformation the data of(0~100cm) layers soil total Nitrogen, available Nitrogen contents were fitted semivariogram, the fitting results are good. Total Nitrogen in 0~20cm spatial distribution reflects moderate spatial correlation; 20~40cm, 40~60cm, 60~ 80 cm and 80~100cm Soil spatial variability is mainly caused by random factors, the spatial distribution of the correlation is low. in the 0~20cm and 40~60cm Soil Nitrogen spatial distribution weak correlation; in the 20~40cm, 60~80cm and 80~100cm Soil Nitrogen reflect the spatial distribution of moderate spatial correlation. By Kriging interpolation results showed: 0~100cm each Soil total N and available Nitrogen content in the western and northwestern regions of the study area is higher, east, northeast and middle area is lower.The reason for this can be analyzed from the following two aspects: ① From the geographical point of view, eastern, southeastern region under the jurisdiction of the study area in south-east Alashankou(ie downwind), while in the upwind direction is an area of about 500km2 lake, wind the underlying surface friction than other types of small, so take a lot of soil nutrients ② from biomass, the western regional average coverage of each sample between 25% to 35%, east, northeast regional average per sampling sites in coverage between 10% to 30%, significantly higher than the east west plant capacity, indicating the amount of how much the plant will lead to uneven distribution of Nitrogen in the two regions.