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Surface Energy Balance Partitioning in Tilled Bare Soils

Author:
Ohene Akuoko, Dilia Kool, Thomas J. Sauer, Robert Horton
Source:
Agricultural & environmental letters 2018 v.3 no.1 pp. -
ISSN:
2471-9625
Subject:
energy balance, evaporation, net radiation, rain, soil density, soil heat flux, soil-atmosphere interactions, tillage
Abstract:
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.
Agid:
6472456
Handle:
10113/6472456