Spatial Variability of Soil Salinity in a Gravel-Sand Mulched Jujube Orchard at Different Scales
Publication: Journal of Irrigation and Drainage Engineering
Volume 143, Issue 6
Abstract
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: , , , and . Soil salinity tended to increase with depth in the 0–50 cm soil profile, with a soil salinity range of . 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.
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Acknowledgments
The research was supported by National Natural Science Foundation of China (51269008), and the HongLiu young teachers training program of Lanzhou University of Technology (Q201310).
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Published In
Journal of Irrigation and Drainage Engineering
Volume 143 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jul 13, 2016
Accepted: Nov 2, 2016
Published ahead of print: Feb 1, 2017
Published online: Feb 2, 2017
Published in print: Jun 1, 2017
Discussion open until: Jul 2, 2017
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