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United States Department of Agriculture

Agricultural Research Service

Research Project: Leveraging Remote Sensing, Land Surface Modeling and Ground-based Observations ... Variables within Heterogeneous Agricultural Landscapes

Location: Hydrology and Remote Sensing Laboratory

Title: A review on temporal stability of soil water contents

Authors
item Vanderlinden, Karl -
item Vereecken, Harry -
item Hardelauf, Horst -
item Herbst, Michael -
item Martinez, Gonzalo -
item COSH, MICHAEL
item PACHEPSKY, YAKOV

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: February 10, 2013
Publication Date: N/A

Technical Abstract: Temporal stability of soil water content (TS SWC) has been observed across a wide range of soil types, landscapes, climates and scales. A better understanding of TS SWC controls and their interactions needs to be developed. The objective of this work is to develop a comprehensive inventory of published data on TC SWC and to determine knowledge gaps. Mean relative difference (MRD) values and associated standard deviations (SDRD) were digitized from 157 graphs in 37 publications and analyzed. The MRD generally followed a Gaussian distribution with a coefficient of determination (R2) greater than 0.84. The standard deviation of MRD (SDMRD) showed an increasing trend with scale. No relationship between SDMRD and R2 was observed. The smallest R2 values were associated with negatively skewed and platykurtic MRD distributions. An analysis of seven land surface controls for TS SWC (land surface parameters related to measurement method, terrain, climate) suggested strong interactions and showed that combined effects are typically observed. Many of the existing datasets on TS WCS are mostly byproducts of soil water dynamics studies in agronomic or environmental projects. Future research should include more focused TS SWC studies tailored to understand interactions of controls and the underlying mechanisms of soil water distribution and dynamics.

Last Modified: 9/10/2014
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