| Unit division for cultivated land evaluation in Qin'an County based on GIS |
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| DOI：10.7606/j.issn.1000-7601.2012.04.40 |
| Key Words: land evaluation evaluation unit 3S Technology |
| Author Name | Affiliation | | CAI Liqun | Key Laboratory of Drought Habitat Crop Science of Gansu Province, Lanzhou 730070, China
College of Resources and Environmental Science, Gansu Agricultural University, Lanzhou 730070, China | | ZHANG Xingjia | Key Laboratory of Drought Habitat Crop Science of Gansu Province, Lanzhou 730070, China
College of Resources and Environmental Science, Gansu Agricultural University, Lanzhou 730070, China | | DONG Bo | Gansu Academy of Agricultural Sciences, Lanzhou 730070, China |
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| Abstract: |
| The cultivated land resource evaluation units in Qin'an were generated by integrating the digital soil map, present landuse map and administrative map, with merging and not merging small polygons less than 7 00
0 m2 and 15 000 m2 of the evaluation unit data layer respectively, and the evaluation results of cultivated land fertility were compared of the evaluation units produced by merging small polygon with three different methods. The results show that for the evaluation unit through merging polygon less than 15 000 m2, the evaluation unit area is large and the contribution rate of the physiognomy types as evaluation factors is small, which impacted the evaluation results and lead to great difference between evaluation result and the actual situation; Because the area of the evaluation units without merging polygon is too small, the designated measuring for data space interpolation can't specific to a very small area, thereby affecting the evaluation results. The conclusion is: the landscape as an important factor and the size of regional area decides the size of the area of evaluation unit. |
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