| GIS-based research on soil quality evaluation in the loess hilly gully region——A case study of Changwu County |
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| DOI：10.7606/j.issn.1000-7601.2011.03.27 |
| Key Words: soil quality evaluation GIS AHP |
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| Abstract: |
| The loess hilly region of Changwu County in Shaanxi Province was taken as the research object. Index
system of soil quality evaluation was established by screening 14 factors as the evaluating indicators, including soil nmutri-ents，environmental factors, trace elements and soil enzyme activity. AHP was applied to work out the weight values of each factor, and comprehensive index method of fuzzy mathematics was adopted to conduct evaluation of soil quality. Based on the platfom of GIS，we divided and mapped the grade distribution of soil quality of Changwu County，achieved the visualization of county scale soil quality and had a clear understanding on the whole county-scale soil quality. The re-sults indicated that soil quality of orchard is better than farmland on the same topography site and soil quality in different topography positions are in the order of table land> bottom land> slope land. Throughout the county scale, the distribu-tion of soil quality indexes between 0. 195~0.710 and grades Ⅲ，IV and V are only 27% of the entire area，however, grade lI is accounted for 59. 7% of the entire area. On the whole, the soil quality of the research region is at medium level and affected by topography site largely， however, the soil quality of orchard is better than famland. Analyzing and evaluating the condition of county-scale soil quality and physical or chemical properties of soils in Changwu County pro-vide practical and theoretical basis for land utilization and nutrient management of orchards and famland. |