Effects of Different Land Use Types on Soil Nutrients in Intensive Agricultural Region

Based on field investigation,laboratory analysis and SPSS software,this paper took Shouguang city of Shandong Province as a case,systematically analyzed the distribution,variation and relevance of soil nutrients to research soil nutrient change under different land use types.The results showed that there was an obvious order in the distribution of soil nutrient content under different land use types: the distribution of organic matter was vegetable landirrigable landgardenfarmlandsaline-alkaline land;the distribution of total-N,available-N,K,P and Zn was vegetable landgardenirrigable landsaline-alkaline landfarmland;the distribution of pH value and exchangeable-Mg was saline-alkaline landfarmlandirrigable landgardenvegetable land;the distribution of exchangeable-Ca under different land use types was saline-alkaline landfarmlandirrigable landvegetable landgarden;the distribution of available-B was gardenvegetable landsaline-alkaline landirrigable landfarmland;the distribution of available-Fe was vegetable landgardenirrigable landfarmlandsaline-alkaline land;and the distribution of available-Cu and available-Mn was gardenvegetable landirrigable landsaline-alkaline landfarmland.The variance of nutrient content between irrigable land,vegetable land and garden was comparatively low,and the variance of nutrient content between farmland and saline-alkaline land was similar.Except for pH,the variance coefficients of the other 12 kinds of soil nutrients under different land use types were all comparatively high,of which the highest variance coefficient was for available-P.Except for exchangeable-Mg and B with other nutrients,the relevance among the others was almost significant or marked significant.The relevance between pH value and the other soil nutrients was significant or highly significant negative correlation,while the relevance of organic matter with other nutrients showed significant or highly significant positive correlation.