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Forests 2015, 6(10), 3748-3762; doi:10.3390/f6103748

Using Plant Temperature to Evaluate the Response of Stomatal Conductance to Soil Moisture Deficit

Yanchi Research Station, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
Key Laboratory of Soil & Water Conservation and Desertification Combating, Ministry of Education, Beijing Forestry University, Beijing 100083, China
School of Technology, Beijing Forestry University, Beijing 100083, China
Author to whom correspondence should be addressed.
Academic Editors: Timothy A. Martin and Eric J. Jokela
Received: 10 August 2015 / Revised: 17 September 2015 / Accepted: 25 September 2015 / Published: 16 October 2015
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Plant temperature is an indicator of stomatal conductance, which reflects soil moisture stresses. We explored the relationship between plant temperature and soil moisture to optimize irrigation schedules in a water-stress experiment using Firmiana platanifolia (L. f.) Marsili in an incubator. Canopy temperature, leaf temperature, and stomatal conductance were measured using thermal imaging and a porometer. The results indicated that (1) stomatal conductance decreased with declines in soil moisture, and reflected average canopy temperature; (2) the variation of the leaf temperature distribution was a reliable indicator of soil moisture stress, and the temperature distribution in severely water-stressed leaves exhibited greater spatial variation than that in the presence of sufficient irrigation; (3) thermal indices (Ig) and crop water stress index (CWSI) were theoretically proportional to stomatal conductance (gs), Ig was certified to have linearity relationship with gs and CWSI have a logarithmic relationship with gs, and both of the two indices can be used to estimate soil moisture; and (4) thermal imaging data can reflect water status irrespective of long-term water scarcity or lack of sudden rainfall. This study applied thermal imaging methods to monitor plants and develop adaptable irrigation scheduling, which are important for the formulation of effective and economical agriculture and forestry policy. View Full-Text
Keywords: plant temperature; soil moisture; stomatal conductance; thermal imaging; irrigation scheduling plant temperature; soil moisture; stomatal conductance; thermal imaging; irrigation scheduling

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yu, M.-H.; Ding, G.-D.; Gao, G.-L.; Zhao, Y.-Y.; Yan, L.; Sai, K. Using Plant Temperature to Evaluate the Response of Stomatal Conductance to Soil Moisture Deficit. Forests 2015, 6, 3748-3762.

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