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摘要
Information about the spatial pattern of soil salinity is important for special site management. The authors determined the spatial variation of salinity in a gravel-sand mulched (using gravel and sand as mulch) jujube orchard by measuring salinity in 256 soil samples collected from 0-10, 10-20, 20-30, and 30-50 cm layers at four sampling scales: 32 x 32, 28 x 28, 24 x 24, and 20 x 20 m. Soil salinity tended to increase with depth in the 0-50 cm soil profile, with a soil salinity range of 0.46-1.30 g=kg. The coefficient of variation (CV) of soil salinity ranged from 5.95 to 18.59%, indicating weak to moderate variability. The spatial distributions of salinity differed in the surface layers at the four sampling scales, indicating obvious peaks and valleys in the three-dimensional map. Salinity in each layer was not completely independent due to the climate, hydrology, water resources, and parental soil material and so was spatially correlated, with bottom and surface of the correlation abatin with depth. Ordinary kriging could estimate the values of selected soil variables with inappropriate data and at unsampled locations, but estimating the salinity in deep soil using cokriging by measuring the salinity in the surface soil was more accurate.
- 出版日期2017-6
- 单位兰州理工大学
