Modeling plant canopy effects on variability of soil temperature and water

Flerchinger, G N
Pierson, F B
Agricultural and Forest Meteorology
Publication Year: 
Vegetative cover affects the spatial and temporal variability of heat and water in the soil. The ability to predict temperature and water conditions enhances our ability to evaluate management options for soil and water conservation, plant establishment and pest control. The simultaneous heat and water (SHAW) model is a detailed process model of heat and water movement in a snow-residue-soil system. This paper describes provisions added to the SHAW model for vegetative cover and simulation of heat and water transfer through the soil-plant-air continuum. The model was applied without calibration to one full year of data on semiarid sagebrush rangeland to simulate vegetation effects on the spatial and temporal variability of soil temperature and water. The model currently has no provisions for plant growth or annual variation in leaf area index, resulting in insufficient shading of the soil surface during summer months. Nevertheless, the model accounted for over 96% of the variation in near-surface soil temperature for sagebrush-covered areas and over 91% of the variation for bare soil surfaces. Simulated water potential and total water use also agreed well with measured values.
Name of Journal: 
Agricultural and Forest Meteorology
no. 3-4
Resource Type: 
Document Type: 
Journal Issue/Article
Grassland Society of Southern Africa

The Grassland Society of Southern Africa (GSSA) is involved and concerned with the science and practice of range and pasture management. This broad field involves primarily the use and conservation of natural resources. It encompasses applied fields such as livestock production, wildlife management, nature conservation, water catchment management and range and mine-dump rehabilitation. The disciplines include, amongst others, ecology, botany zoology, range and pasture science, animal science, soil science and genetics. This collection includes journal articles from the African Journal of Range and Forage Science as well as related articles and reports from throughout the Southern African region.