Predicting Spatial Variability of Soil Bulk Density in Gravel-Mulched Fields
Publication: Journal of Hydrologic Engineering
Volume 23, Issue 6
Abstract
Information about soil bulk density (SBD) is important for soil-water conservation, carbon content, and nutrient reserves. The authors studied the spatial variability of SBD in gravel-mulched fields of different ages in an arid area of northwestern China. The SBDs of a new gravel-mulched field (NGM), a moderately aged gravel-mulched field (MGM), an old gravel-mulched field (OGM), and bare land (CK) ranged from 1.07 to 1.41, 1.15 to 1.41, 1.18 to 1.38, and 1.04 to , respectively, with a general trend of . The coefficients of variation were less than 7.58%, indicating weak spatial variability. SBD was strongly correlated with soil-water content (SWC), indicating that the distribution of high and low SBD can be approximately estimated using SWC distribution. Kriging could effectively predict the spatial distribution of SBD in the study area with a high precision of interpolation, but estimating SBD using cokriging by measuring SWC was more accurate.
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Acknowledgments
This study was supported by National Natural Science Foundation of China (51269008, 51409137), the Longyuan Youth Innovation and Entrepreneurship Project, and the HongLiu Young Teachers Training Program of Lanzhou University of Technology (Q201310).
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Published In
Journal of Hydrologic Engineering
Volume 23 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jun 28, 2017
Accepted: Dec 20, 2017
Published online: Apr 5, 2018
Published in print: Jun 1, 2018
Discussion open until: Sep 5, 2018
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