Journal of Food, Agriculture and Environment

Spatial variance characteristics of soil available microelements in tobacco planting fields on slant plain in the east side of Funiushan mountain in central China

Author(s):

Hai-Sheng Chen ^{1, 3}, Bin-bin Jin ^{2, 3}*, Ting-ting Chang ²

Recieved Date: 2013-01-20, Accepted Date: 2013-04-28

Abstract:

I Microelements are essential to the growth and quality of flue-cured tobacco which can not be replaced by other nutrient elements. Most microelements in tobacco planting fields exhibited strong spatial autocorrelation. In this paper, a total of 359 soil samples were taken from surface soil (0~20) of Xiangcheng tobacco planting fields, on slant plain in the east side of Funiu Mountain in April 2008 for testing the concentration of available Zn, Mn, Fe, Cl, B, Mo and Cu. Spatial variability of elements mentioned above was evaluated by using geostatistics and geographic information system (GIS) analyses. The target of this study is to figure out the spatial distribution of soil microelements and to provide a firm foundation for formulating fertilizer target scientifically to improve soil quality in this tobacco planting region. The results suggest that among those seven microelements, the variation coefficient of B is the smallest while that of available Zn is the greatest, which demands more samples under the same precisions. Analysis of the isotropic variogram indicated that the available Mo and Cl semivariogram were well described with exponential model, with the distance of spatial dependence being 51740.2 and 25370 m, respectively, while the available Fe and Mn semivariogram were well described with spherical models, with the distance of spatial dependence being 10880.1 and 14060 m respectively. And the available Cu semivariogram were well described with liner models, while the available Zn and B semivariogram fitted a gaussian model. Available Mn and Fe were strongly spatially dependence with C₀/sill being 0.014, 0.031 respectively in this region. The C₀/sill of available Zn, Mo, B, Cl was in the range from 0.147 to 0.441. With the kriging analysis, the spatial distribution maps of contents of microelements in Xiangcheng tobacco planting region has been drawn in ArcGIS (Version 8.3). The spatial maps of three microelements (Fe, Mn, and Cl) indicate the similar distribution trends with higher concentrations in the west-northern parts of the investigated region and lower concentrations in the east-southern parts of it. The spatial maps of available Cu and Mo shows the similar distribution trends with higher concentrations in the east-southern parts of the region and lower concentrations in the west-northern parts of it. The distribution tendency is decreasing from southeast to northwest. The soils with higher contents of available Zn and B have been found in the middle parts of the investigated region, while the soils with lower contents of available Zn and B have been found in the plains of southern-east and hillock in the northern-west parts of it. The research findings attained in this study will help to improve our understanding of spatially variable of soil microelements of tobacco planting fields and providing a quantitative basis for decision and policy made to develop innovative management strategies for tobacco crops to sustain microelements nutrition.

Keywords:

Geostatistics, spatial variability, flue-cured tobacco, microelements

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 2
Category: Environment
Pages: 1464-1469

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