Campus Units

Agronomy

Document Type

Article

Publication Version

Published Version

Publication Date

2018

Journal or Book Title

Agricultural & Environmental Letters

Volume

3

Issue

1

First Page

1

Last Page

4

DOI

10.2134/ael2018.07.0039

Abstract

Core Ideas

  • Following tillage, soil bulk density increased after rainfall.
  • Increases in soil bulk density decreased the available energy for turbulent fluxes.
  • Surface energy balances in tilled soils are affected by changes in bulk density.

Surface energy balance (SEB) partitioning is critical to heat and water budgets at the soil–atmosphere interface. Tillage can alter SEB partitioning by initially decreasing soil bulk density (ρb), after which ρb increases with time due to rainfall and other factors. The objective of this study is to determine the effect of ρb changes on SEB partitioning. We measured SEB components for two 4‐d periods (Period 1 and Period 2) at an early‐tilled (T1) and late‐tilled (T2) bare soil site. During Period 1, ρb, net radiation, and soil heat flux were similar for T1 and T2, but evaporation was higher at T2. During Period 2, ρb was 0.11 g cm‾3 larger at T2 than at T1. This resulted in a 7% higher soil heat flux at T2, which in turn caused 13% less evaporation. These results highlight the importance of considering dynamic ρb with time when determining SEB partitioning for tilled soils.

Comments

This article is published as Akuoko, Ohene, Dilia Kool, Thomas J. Sauer, and Robert Horton. "Surface energy balance partitioning in tilled bare soils." Agricultural & Environmental Letters 3, no. 1 (2018): 1-4. doi: 10.2134/ael2018.07.0039.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

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