Soil Nutrients Spatial And Temporal Variation Of Harqin Banner Farmland Based On The GIS

Based on mathematical model and the GIS calculated and the establish Harqin Banner Farmland soil nitrogen,phosphorus,potassiumcontent,nitrogen,phosphorus,potassium density and nitrogen,phosphorus, potassium reserves database in1983and2007,and explain changes and reasons for changes in different types of soil,landform types,use,township of Harqin Banner farmland nitrogen, phosphorus, potassium.the results are as follows:1.Harqin Banner farmland soil nitrogen were0.801g/kg and1.029g/kg respectively.In24years increased by28.4%,in24years,soil nitrogen density were0.21kg/m2and0.27kg/m2respectively,increased by28.4%,soil nitrogen storage were104957.64t and134455.98t,increased29498.34t;soil phosphorus4.71mg/kg,and14.69mg/kg respectively,in24years increased by212%,phosphorus density were1.23kg/m2and3.85kg/m2respectively,adds212.4%.Soil phosphorus content were614.30t and1919.01t, increased1304.70t.Soil potassium were139.9mg/kg and144.3mg/kg respectively, increased by3.1%, potassium.density were36.84kg/m and37.9kg/m2respectively, increased by2.9%,the potassium content were18366.36t and18892.39t,in24years,an increase of1098.75t.2.In.24years, cinnamon soil nitrogen content, nitrogen density variation adds the most,35.1%,34.2%respectively,and fix nitrogen most,as23273.28t.Nitrogen nitrogen content and density increase minimum in meadow soil.soil phosphorus content, density the greatest increase in cinnamon soil,281.7%284.9%,fixed phosphorus up,840.66t.Potassium content,density and reserves decrease in loess and meadow soil.Brown soil lossed potassium severe,is381.43t,cinnamon soil fixedpotassium up, is890.89t.3.24years,nitrogen、density reserves changed the most on plain area,low mountainous area with minimal changes.Phosphorus content, density,reserves rised rapidly,changed the biggest on plain area,minimal changeson low mountainous area.Potassium content,density, reserves has slightly increased in the plain area.dropped. in other landforms.4.Nitrogen content、density and reserves rised the most on the paddy field in24years,; minimal changes on dry land, Potassium content and density changed the most on minimal changes on dry land. Potassium increased on paddy field and water land,redused on dry land. 5.The nitrogen content and density increased in all townships of Harqin Banner in1983-2007year, the nitrogen rises highest in Xiqiao Town, phosphorus increased in all towns, rise highest in Nailin town.Potassium content and density reduced inNailin town and Wangyefu town,increased in other town.