Study On Spatial Variability Of Soil Nutrient Elements In A Mollisol Watershed Of China

With the rapid economic and social development and human civilization and progress,the ecological environment become more and more attention.Action plans to gradually develop national soil pollution prevention.Soil quality is the focus of attention.Soil quality is the focus of attention.Is located in heilongjiang province in the southwest,the river is the longest tributary trench river basin,Trench river watershed in land development and utilization of the earlier,various types of land use.Water distribution in the basin is clear.Main traffic routes will study is divided into two parts.Rural settlement is uniformly distributed in the study area.Therefore,in order to trench river watershed as the study area,Study the spatial and differential laws of soil properties and drive,Soil quality evaluation,and in typical.Soil is affected by the natural evolution rule and think factors of complex,into the soil nutrient index space variation regularity and power factor of the research,the scientific management of land,reasonable planning of farmland and realization of precision agriculture,improve the quality of soil environment has significant meaning.Based on the classical statistics,geostatistics and GIS technology,this paper study the spatial variation characteristics of soil nutrition elements in cultivated land,and study its model simulation and influence factors of spatial distribution using semivariance function model,the Moran's I,kriging,correlation analysis,grey relational analysis and regression analysis in a mollisol Haigou watershed of China.Study the spatial comprehensive difference distribution of soil nutrition elements,and study its model using orrelation and significant,maximum entropy and zonal statistics analysis in study area.The main conclusion are as follows.(1)Through a multi-angle analysis of characteristics of space,can understand the indicators of the spatial distribution characteristics of comprehensive,and some indicators have certain spatial distribution pattern.Soil pH variation coefficient is very small,small numerical dispersion degree;Great spatial distribution pattern,the west and low in;The spatial distribution presents significant autocorrelation.Soil moisture data presentation medium level of variation.Spatial distribution and highly correlated to the land use,spatial distribution present significant autocorrelation,similar to soil pH distribution characteristics,interaction between both influence each other.TP and AP all the semivariance function similarity is very high,TN and AN the semivariance function significant difference,AP and Ca-P low spatial distribution of high value area and area opposite trend.(2)Under different land use ways,each index distribution is different,paddy field under the condition of using small differences between soil properties index data,paddy field with higher ues.Different slope of SOM in the top,flat and slope is close to the mean,bottom content is low.The top and bottom peacefully and similar coefficient of variation less than those in the slope.Study area terrain factors impact on soil nutrients spatial distribution.The basic terrain factors elevation is an important factor affecting the quality of soil,section curvature only has a significant effect on soil organic matter.Location factors of the distance from the village,the distance from the traffic and drainage distance affects the distribution of soil quality indicators.Research on the index distribution extent found terrain factors,elevation,distance,transport distance village has significant effects on indicators.The spatial distribution CAP and water distribution.The main terrain factors can affect the CAP division is village distance.Only through the element distribution figure cannot be comprehensive real understanding of the target.(3)The present situation of comprehensive distribution of soil nutrient different level in study area,Slope factors have litter effect on it,Land use types and elevation have a great influence on it.The comprehensive level of soil nutrient is : paddy field> forest land> dry land.With the increase of altitude,the soil quality decreased in cultivated land.