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| DOI: | 10.1016/j.agrformet.2014.06.012 |
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| Web URL(s): | http://www.sciencedirect.com/science/article/pii/S016819231400166X
Last checked: 03/30/2016
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Sinclair, Thomas R.;
Wherley, Benjamin G.;
Dukes, Michael D.;
Cathey, Sarah E. |
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| Author Affiliation: | Sinclair: Department of Crop Science, North Carolina State University, Raleigh, North Carolina; Wherley: Department of Soil and Crop Sciences, Texas A&M University, College Station, Texas; Dukes: Department of Agricultural and Biological Engineering; Cathey: Department of Environmental Horticulture, University of Florida, Gainesville, Florida |
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| Title: | Penman's sink-strength model as an improved approach to estimating plant canopy transpiration |
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| Source: | Agricultural and Forest Meteorology. Vol. 197, October 15 2014, p. 136-141. |
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| Publishing Information: | Amsterdam: Elsevier |
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| # of Pages: | 6 |
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| Related DOI | 10.1016/j.agrformet.2014.06.01 |
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| Keywords: | TIC Keywords: Canopy; Evaluative methods; Evapotranspiration rate; Models; Penman equations
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| Abstract/Contents: | "The Penman energy balance equation has become a common approach to estimating the evaporation of plant canopies. Unfortunately, implementation of the energy balance equation requires various assumptions and empiricisms, including 'crop coefficients', so that in practice the Penman equation is used as a framework in which to apply empirical approximations. These limitations are reviewed in this paper. An alternative to the energy balance approach suggested by Penman was a 'sink strength' model in which the gradient in vapor pressure was considered the prime driver of plant water loss. In this paper, the sink strength model is developed for determining plant canopy transpiration based on explicitly defined properties of the plants. The key variables are the carbon assimilation pathway of photosynthesis and the biochemical composition of the plant material being synthesized. These two parameters define the transpiration efficiency coefficient and radiation use efficiency that are required in the calculation of transpiration. Also, it is necessary to define a weighted vapor pressure gradient for transpiration when making estimates of the amount of transpiration on a daily basis. The derived expression of the sink strength model was used to compare predicted transpiration with measured values of four turf grass species measured over three years. A close linear correlation was observed for all grasses (P < 0.0001). However, there was an indication that the grasses may vary slightly in their radiation use efficiencies, which with measurement of photosynthetic capacity would further improve the predicted transpiration rates. The ability to directly compute transpiration from explicitly defined variables based on plant traits offers an attractive alternative to the Penman energy balance approach." |
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| Language: | English |
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| References: | 20 |
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| Note: | Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Sinclair, T. R., B. G. Wherley, M. D. Dukes, and S. E. Cathey. 2014. Penman's sink-strength model as an improved approach to estimating plant canopy transpiration. Agric. Forest Meteorol. 197:p. 136-141. |
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| DOI: 10.1016/j.agrformet.2014.06.012 |
| Web URL(s):
http://www.sciencedirect.com/science/article/pii/S016819231400166X
Last checked: 03/30/2016
Access conditions: Item is within a limited-access website |
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MSU catalog number: b2322466 |
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