| Spatial variability and controlling factors of soil trace elements in hilly and gully area of the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2012.01.07 |
| Key Words: soil trace element spatial variability geostatistics Kriging interpolation |
| Author Name | Affiliation | | SONG Fengji | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | CHANG Qingrui | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHONG Deyan | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | FANG Ruihong | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| With Ansai County as the study area, geostatistics combined with geographical information system (GIS) technique were applied to analyze the spatial variability and controlling factors of soil available Fe, Mn, Cu and Zn in hilly and gully area of the Loess Plateau. The result indicated that: the variation coefficient of these soil trace elements was between 14.81% and 22.49%, and every trace element had medium variability; The nugget effect value was between 11.76% and 46.94%, and the spatial correlation of Zn was highly dependent, while Fe, Mn and Cu were moderately dependent; The spatial distribution of the content of each trace element showed a diminishing trend from north and south to the central area. The soil type remarkably influenced the contents of Mn and Cu, indicating that th
eir contents in gray-cinnamon soils were higher than those of loessial soils. The relative elevation (Hr) had highly significant negative correlation with Fe, Mn and Zn; Gradient (β) had significant or highly significant negative correlation with Mn and Cu; Roughness of terrain(QFD) had significant or highly significant negative correlation with Fe and Cu. Organic matter, available nitrogen, available phosphorus and available potassium had significant or highly significant negative correlation with Cu and highly significant positive correlation with Zn; Available potassium had highly significant positive correlation with Fe and Mn; pH had significant or highly significant negative correlation with each soil trace element. This study provided basis and reference for reasonable fertilization and soil environmental protection in this area. |
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