Spatial Variations Of Bushes, Chaste Trees And Nutrients In Soil After The Application Of Nitrogen Fertilizer

The effects of atmospheric nitrogen deposition for ecosystem is the focus of the modern ecology. In arid and semi-arid region of Taihang mountain foothills region, nitrogen simulated nitrogen deposition is used to understand the changes of soil nutrient content of thorns thickets and spatial variation, the influence of in order to provide theoretical basis for vegetation restoration in Taihang mountain area. 5 samples were collected from Taihang Mountains in which different thorns of nitrogen fertilizer were applied. Samples were analyzed using traditional statistical analysis approach and geo-statistical methods in terms of p H, organic matter, total nitrogen and rapidly available phosphorus values in the soil. The result is as follows:(1) Before the application of nitrogen fertilizer, the average soil p H value of 5 different samples was 7.2723. The average values of organic matter, total nitrogen and rapidly available phosphorus were 13 v.0184kg/kg, 0.8390 kg/kg and 8.0657 mg/kg respectively. 30 days after the application of nitrogen fertilizer, the average values of organic matter, total nitrogen and rapidly available phosphorus were 12.0511kg/kg, 0.8593 kg/kg and 20.4264 mg/kg respectively. 60 days after the application of nitrogen fertilizer, the average values of organic matter, total nitrogen and rapidly available phosphorus were 13.8526kg/kg, 0.9721 kg/kg and 10.0939 mg/kg respectively, which were in the low level according to the nutrient classifications. From the perspective of variation levels, p H and water belonged to weak variations, organic matter and total nitrogen belonged to moderate variations and rapidly available phosphorus belonged to strong variations.(2) Overall, the correlation between soil nutrients is as follows: there was apparently negative correlation between the p H and organic matter as well as between p H and total nitrogen. Total nitrogen was positively correlated to organic matter. Except the negative correlation between rapidly available phosphorus and p H 60 days after the application of nitrogen fertilizer, rapidly available phosphorus was not correlated to p H, organic matter and total nitrogen.(3) The Co for the organic matter, total nitrogen and rapidly available phosphorus before and after the application of nitrogen fertilizer were relatively small. For the majority of Co values, Co/(C + Co) < 25%. The variation range of organic matter was 40.4-361.65, the variation range of total nitrogen was 40.4-491.56 m and the variation range of rapidly available phosphorus was 51.3-824.4m. The residuals of analogue function were all small, which indicates that semi-variogram fitted the data best.(4) For bushes and chaste trees, the special distribution of nutrients is as follows: In the surface layer(0-5cm), before and after the application of nitrogen fertilizer, the density of organic matter and total nitrogen increased first and then decreased as the depth increased. The turning point was about 60-90 cm in depth.. The general trend for rapidly available phosphorus was that its density decreased as the depth increased. In the intermediate layer(5-10cm) and deep layer(10-20cm), the density of organic matter and total nitrogen were relatively constant as the depth changed. There was no apparent trend of rapidly available phosphorus density in those layers.(5) Before and after the application of nitrogen fertilizer, the density of organic matter, total nitrogen and rapidly available phosphorus tended to be higher inside the crown than the outside. After the application of nitrogen fertilizer, the density of various nutrients all increased to different extent, which suggests that nitrogen helps to increase the density of nutrients in the soil.(6) In the vertical direction, before and after the application of nitrogen fertilizer, the density of nutrients in the soil where bushes grew decreased as the depth increased: 0-5cm > 5-10 cm > 10-20cm...