Open AccessSurface Energy Balance Partitioning in Tilled Bare Soils
Author(s) -
Akuoko Ohene,
Kool Dilia,
Sauer Thomas J.,
Horton Robert
Publication year - 2018
Publication title -
agricultural and environmental letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.681
H-Index - 12
ISSN - 2471-9625
DOI - 10.2134/ael2018.07.0039
Subject(s) - soil water , evaporation , environmental science , soil science , flux (metallurgy) , bulk density , tillage , energy balance , atmosphere (unit) , atmospheric sciences , hydrology (agriculture) , chemistry , geology , agronomy , physics , geotechnical engineering , organic chemistry , biology , thermodynamics
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 (ρ b ), after which ρ b increases with time due to rainfall and other factors. The objective of this study is to determine the effect of ρ b 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, ρ b , net radiation , and soil heat flux were similar for T1 and T2, but evaporation was higher at T2. During Period 2, ρ b 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 ρ b with time when determining SEB partitioning for tilled soils.