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| Spatial distribution characteristics of soil microelements in Wuqiao County of Hebei Province |
| Fan Wenjie1,2, Zhang Hongjiang1, Cheng Jinhua1, Yao Jingjing1 |
| 1. Beijing Forestry University, Key Lab. of Soil & Water Conservation and Desertification Combating, Ministry of Education, 100083, Beijing, China; 2. Forestry Bureau of Hebei Province, 050001, Shijiazhuang, China |
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Abstract In order to reveal the spatial distribution of soil available microelements, and to better guide fertilizer management, 4965 soil samples were collected from Wuqiao County of Hebei Province as the research object. By using the geostatistics method combined with GIS, spatial distribution characteristics of the mass fraction of effective Cu, Fe, Mn and Zn were studied. The results showed that the mass fractions of effective Cu, Fe, Mn and Zn were 11.54, 11.84, 1.30 and 0.97 mg/ kg, respectively. The result of relevant parameters of semivariance analysis showed that the spatial autocorrelation ranges of effective Fe and Cu were larger in topsoil, while those of effective Zn and Mn were smaller in topsoil. The heterogeneity ranges of effective Fe and Cu were 879 and 660 m, respectively, while those of effective Zn and Mn were 33 and 36 m, respectively. The range of available microelements followed the order of effective Fe > effective Cu > effective Mn > effective Zn. Theoretical semivariogram models of four kinds of microelements conformed to exponential model. The ratios of nugget and sill of effective Cu and Fe ranged between 25% and 75%, which showed a moderate spatial correlation. The ratios of nugget and sill of effective Mn and Zn were higher than 75%, showing a weak spatial correlation. The spatial distribution maps by ordinary kriging interpolation can well reflect the spatial variability of soil microelements, and the accuracy of interpolation was relatively higher by testing.
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Received: 04 March 2014
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