| Spatial variability of agricultural water and soil resources of northwest arid area |
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| DOI：10.7606/j.issn.1000-7601.2018.02.30 |
| Key Words: agricultural water & soil resources spatial variability semivariogram northwest arid area |
| Author Name | Affiliation | | DONG Yan | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Hui | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Hui-hui | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Qing-feng | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Agricultural water and soil resources are the basis of food production for human beings. Based on classical statistics and geostatistics analysis, spatial variability of water resources index (WRI) and arable land resources index (ALRI) in Northwest Arid Area were investigated to illustrate their spatial distribution. Results showed that both WRI and ALRI had the medium variability, and the best-fitting semi-variogram model was a Gaussian model and Exponential model, respectively. Simultaneously, the WRI and ALRI were spatially irregular distributed with strong and medium spatial correlation characteristics, respectively. Results of this study not only reveal the spatial variability of agricultural water and arable land resources of Northwest Arid Area, hence can be taken as a theoretical foundation to guide future optimization and utilization of agricultural water & soil resources in this area. Also, it established a novel methodology for spatial variability of spatial elements in a large-scale area, such as the Northwest Arid Area. |
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