Abstract:

PingDingShan district is the main area where the full aroma type tobacco is distributed in China. The soil microelements are very important to the quality of flue-cured tobacco. Study on the spatial variability of soil microelements in tobacco plantation soils is the foundation of precision agriculture. In this study, the geostatistics analysis is used to analyze the spatial variability of soil microelements in PingDingShan area, and the interpolation map of soil microelements are made for analysis the spatial distributions. The result showed: (1)The CVs from mathematical statistics were between 13.49% (available Cu)and 36.51% (available Zn), and the four microelements are meet the normal distribution. (2)The spherical models are the optimal models that showed the spatial variability of microelements. The nuggets, ranges and the rations of Co/Co+C of all tested microelements contents are between 0.01~4.66, 34.3~376.3 m, 13.61%~49.99%, respectively. (3)The anisotropy analysis showed that the four kinds of soil microelements have a certain degree of anisotropy, the anisotropy of available copper and iron are more, and the available manganese and zinc are less. (4)The interpolation maps of the soil microelements with Kriging showed that there were strong effects of random effects (human’s action) action on the spatial variability of available Zn. The spatial distributions of available Fe, Cu and Mn contents were decided by structural factors (soil parent materials) in PingDingShan district. The research on the statistical characters and the semivariance structure of the 4 microelements can provide scientific basis for using reasonable of tobacco plantation field, and provide the guidelines for management of soil nutrients, soil amelioration and cultivation.