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United States Department of Agriculture

Agricultural Research Service

Title: Instrumented Measure and Simulated Solutions for the Soil Energy Balance under Residues

Authors
item Aiken, Robert
item Flerchinger, Gerald
item Nielsen, David
item Alonso, Carlos
item Rojas, Kenneth

Submitted to: Agronomy Journal
Publication Type: Abstract Only
Publication Acceptance Date: May 3, 1993
Publication Date: N/A

Technical Abstract: Knowledge of soil warming, evaporation, wind erosion and emission of greenhouse gases is enhanced when plant residue effects on heat and vapor exchange are correctly quantified. This study quantifies effects of residue architecture on soil-atmosphere thermal profiles and exchange processes. A low-cost field instrumentation and data acquisition system quantified global and net radiation, wind and temperature profiles--used to derive components of the energy budget. Heat and vapor exchanges among soil and atmosphere elements were simulated (Root Zone Water Quality Model) by Richards-and Penman-type equations, coupled by flux or state boundary value solutions. Scaled wind velocity profiles within sunflower residues followed the log wind profile law but deviated from predictions based on stand density and residue dimensions. Temperatures of horizontal wheat residue elements exceeded ambient by up to 15 C under full sunshine and low convection. Simulation accuracy can be enhanced by improved parameterization for convective and readiative effects of residue architectures.

Last Modified: 12/18/2014
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