| Research on relationship of CWSI and photosynthetic parametersduring flowering and boll-forming stage of cotton based on infrared thermograph |
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| DOI：10.7606/j.issn.1000-7601.2012.05.17 |
| Key Words: Cotton CWSI Pn Gs Tr Correlation |
| Author Name | Affiliation | | CHENG Qi | Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan/College of Agronomy, Shi Hezi University, Shi Hezi 832003, Xinjiang, China | | HUANG Chunyan | Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan/College of Agronomy, Shi Hezi University, Shi Hezi 832003, Xinjiang, China | | WANG Dengwei | Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan/College of Agronomy, Shi Hezi University, Shi Hezi 832003, Xinjiang, China | | XIAO Lijuan | Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan/College of Agronomy, Shi Hezi University, Shi Hezi 832003, Xinjiang, China |
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| Abstract: |
| Using Fluke infrared thermal camera the canopy infrared thermal images at flowering and boll-forming stage of cotton under film drip irrigation experiment of 2 cotton cultivars with 4 levels water treatments in North of Xinjiang was obtained. Based on the image processing technology the temperature of canopy sunlit leaves was acquired. For calculation of CWSI the wet artificial reference surface (WARS) temperature was used in empirical formulation defined by Jones (1992). Using LI-6400 portable photosynthesis system the data of the corresponding net Photosynthetic Rate (Pn), Stomatal Conductance (Gs) and Transpiration Rate (Tr) were obtained for studying the correlation between CWSI and Pn, Gs and Tr in different level water treatments during flowering and boll-forming stage of cotton canopy. The result showed that under water stress CWSI increased with Pn, Gs and Tr reduction. CWSI threshold should be 0.37 to 0.40. CWSI was significantly difference (α=0.05) in water-stressed treatment and non water-stressed treatment. CWSI was higher i
n water-stressed treatment. The relationship between CWSI and Pn, Gs and Tr was significantly negative correlated (RCWSI-Pn=-0.8533**, RCWSI-Gs=-0.7771**, RCWSI-Tr=-0.8063**). CWSI as well Pn, Gs and Tr can synchronously reflect drought stress of cotton canopy. |
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