Spatial Variability of Organic Matter and Total Nitrogen in Panxi Tobacco Growing Soil

This study was conducted to investigate the spatial distribution of soil organic matter and total nitrogen content and its influence factors,and provide a theory basis for management of fertilizing reasonably on tobacco.Soil samples were conducted by GIS and geostatistics in the tobacco region of Panxi,Sichuan Province.Results show that the concentrations of soil organic matter and total nitrogen content are moderate variability with the averages of 5.00-59.63 and 0.40-3.16 g·kg-1,and the variation coefficient are 38.66% and 39.26%,respectively.The nugget coefficient of the soil organic is 0.578,and has moderate spatial correlation,suggesting they are co-affected by structural factors like soil type and relief.Meanwhile,the nugget coefficient of the total nitrogen is 0.221,and it has a strong spatial correlation,indicating it is primarily controlled by structural factors like soil type and relief.Kriging interpolation map indicated that the soil organic matter showed an increasing trend from south to north,while total nitrogen showed an increasing trend from west to east.In addition,soil samples with organic matter in the most unsuitable range account for 24.57%,and total nitrogen content in the most suitable range account 39.72%.Scientific management should be adopted to manage organic and nitrogen fertilizer in soil according to the status of organic matter and total nitrogen content in different areas for elevations and soil types.