Campus Units

Agronomy

Document Type

Book Chapter

Publication Version

Published Version

Publication Date

2005

Journal or Book Title

Micrometeorology in Agricultural Systems

Volume

47

First Page

131

Last Page

154

DOI

10.2134/agronmonogr47.c7

Abstract

Climatic conditions on the earth’s surface are in part a function of varying physical position (elevation, latitude, and aspect) and the influence of large-scale meteorological forces such as air and ocean currents. The density and architecture of plant canopies in natural systems are directly influenced by these climatic factors. By contrast, for agricultural systems, it is the crop canopies that often influence local microclimate. In both instances, the soil plays an important role in affecting climate near the surface. Properties of the surface soil layer including color, water content, texture, and density affect the partitioning of incident radiation and how much energy is used to evaporate water, warm the air above the ground, or warm the soil.

The amount of thermal energy that moves through an area of soil in a unit of time is the soil heat flux or heat flux density. The ability of a soil to conduct heat determines how fast its temperature changes during a day or between seasons. Soil temperature is a key factor affecting the rate of chemical and biological processes in the soil essential to plant growth. Soil heat flux is important in micrometeorology because it effectively couples energy transfer processes at the surface (surface energy balance) with energy transfer processes in the soil (soil thermal regime). This interaction between surface and subsurface energy transfer processes has led to detailed investigations of soil heat flux for a wide variety of agricultural systems.

Comments

This chapter is from Sauer, T.J. and R. Horton. 2005. Soil heat flux. In: J.L. Hatfield and J.M. Baker (Editors), Micrometeorology in agricultural systems. ASA Monograph 47: 131-154. American Society of Agronomy, Madison, Wisconsin. doi: 10.2134/agronmonogr47.c7.

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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