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Spatial variation of corn canopy temperature as dependent upon soil texture and crop rooting characteristicsA soil plant atmosphere model for corn (Zea mays L.) together with the scaling theory for soil hydraulic heterogeneity are used to study the sensitivity of spatial variation of canopy temperature to field averaged soil texture and crop rooting characteristics. The soil plant atmosphere model explicitly solves a continuity equation for water flux resulting from root water uptake, changes in plant water storage and transpirational flux. Dynamical equations for root zone soil water potential and the plant water storage models the progressive drying of soil, and day time dehydration and night time hydration of the crop. The statistic of scaling parameter which describes the spatial variation of soil hydraulic conductivity and matric potential is assumed to be independent of soil texture class. The field averaged soil hydraulic characteristics are chosen to be representative of loamy sand and clay loam soils. Two rooting characteristics are chosen, one shallow and the other deep rooted. The simulation shows that the range of canopy temperatures in the clayey soil is less than 1K, but for the sandy soil the range is about 2.5 and 5.0 K, respectively, for the shallow and deep rooted crops.
Document ID
19830014422
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Choudhury, B. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 4, 2013
Publication Date
February 1, 1983
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NAS 1.15:84981
NASA-TM-84981
Accession Number
83N22693
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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