NDLI: Scale dependency of spatial variability of soil moisture in gravel-mulched field

Content Provider	Springer Nature Link
Author	Zhao, Wenju Cui, Zhen Li, Na
Copyright Year	2016
Abstract	Knowledge of the scale dependency of the spatial variability of soil moisture is of paramount importance in the study of soil–atmosphere interactions and hydrological processes. We present a case study of the effects of sampling area and spacing on the spatial variability of soil moisture in a 32 × 32 m gravel-mulched field in an arid area of northwestern China. The coefficient of variation, correlation length and Moran’s index, which are commonly used in spatial analysis, were applied to each scenario to characterise the degree of spatial variability of soil moisture. The spatial variability was weak at all sampling scales. All indices increased to various degrees with an increase in sampling area. The correlation length decreased with increasing sampling spacing, and neither the coefficient of variation nor Moran’s index were significantly correlated with sampling spacing, indicating that sampling spacing had little effect on soil-moisture variability. The spatial distributions of soil moisture were irregular, with peaks and valleys at different sampling spacings but tending to gradually stabilise as sampling spacing increased. A sampling spacing of 8 m was reasonable, because it best-characterised the spatial distribution of soil moisture. This study also provides a theoretical reference for the establishment of optimal sampling schemes, which allow a considerable savings in both time and cost, and provides theoretical support for ecological agricultural production in gravel-mulched fields.
Starting Page	1
Ending Page	8
Page Count	8
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	22
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-11-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gravel-mulched field Soil-moisture content Spatial distribution Scale dependency Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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