Temporal and spatial distribution of soil nutrients in tropical arable land of China——A case study of Dongfang City,Hainan

【Objective】Spatial and temporal distribution characteristics of soil nutrients in tropical arable land of China and the influencing factors were analyzed in order to provide references for managing soil nutrients in tropical arable land. 【Method】Based on the field survey,soil sampling and nutrient analyzing, soil nutrient status was studied and compared with the results of the Second National Soil Survey. Spatial and temporal distribution characteristics of soil nutrients in tropical arable land were explored. 【Result】The results indicated that the contents of nutrients in cultivated soil varied significantly in Dongfang City. The arable land soil was acidic soil as a whole with pH of 5.49. The concentration of soil organic matters, macronutrients(N,P and K) and medium nutrients(Ca,Mg and S) in arable land soil was relatively lower in Dongfang City. However,the contents of available B and available Zn were sufficient. Compared with the results of the Second National Soil Survey,soil acidification was more evident. The concentration of organic matters decreased significantly,which was 6.0 g/ kg,and the available P content increased by 15.2 mg/kg. 【Conclusion】In Dongfang City, soil nutrients content was not sufficient and distributed unevenly. Soil acidification and variation of soil nutrients were related to climate factors,distribution of soil parent materials and chemical fertilizer application.