| Light response characteristic of photosynthetic rate and stomatal conductance in red globe grape |
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| DOI：10.7606/j.issn.1000-7601.2017.04.35 |
| Key Words: red globe grape photosynthetic rate stomatal conductance models applicability |
| Author Name | Affiliation | | LI Hu-jun | State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi'an University of Technology, Xi'an, Shaanxi 710048, China | | WANG Quan-jiu | State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi'an University of Technology, Xi'an, Shaanxi 710048, China
State Key Laboratory of Soil Erosion and Dry-Land Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | SU Li-jun | Collegel of Sciences, Xi'an University of Technology, Xi'an, Shaanxi 710048, China | | SHI Bin-bin | State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi'an University of Technology, Xi'an, Shaanxi 710048, China | | ZHOU Guang-lin | State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi'an University of Technology, Xi'an, Shaanxi 710048, China | | ZHOU Bei-bei | State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi'an University of Technology, Xi'an, Shaanxi 710048, China |
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| Abstract: |
| In order to access the applicability of light response model and stomatal conductance model for Red Globe Grape, the light response processes of red globe grape were measured at fruit swelling stage and berry ripening stage in the field. The optical light response model (non rectangular hyperbola model, modified rectangular hyperbola model) and stomatal conductance model (Ball-Barry model, stomatal conduction mechanism model) were adopted to fit photosynthetic rate and stomatal conductance. Meanwhile, Ball-Barry model was coupled with non rectangular hyperbola model and compared with Jarvis model, and then the stomatal conductance of the light response characteristics was analyzed. Results indicated that the non rectangular hyperbolic model and the modified rectangular hyperbola model could predict the light response process of photosynthetic rate of red globe grape well. The initial quantum efficiency (α), dark respiration rate (Rd) and light compensation point (LCP) obtained by non rectangular hyperbolic model were more close to the measured values, the determination coefficient was larger than 0.9 (R2≥0.987). Furthermore, the stomatal conductance increased with the increase of photosynthetic rate, the determination coefficient fitted by Ball-Barry model was bigger（R2≥0.715）, and the RMSE was smaller（RMSE≤0.0127）, which indicated that Ball-Barry model could better predict the relationship between the stomatal conductance and photosynthetic rate of red globe grape. Coupling model could describe the light response of stomatal conductance (R2≥0.703) as a whole, but the accuracy of stomatal conductance under the high light intensity was low. Different from the coupling model, the simulated results from the Jarvis model were more close to the measured data (R2≥0.839), and the value of RMSE was small (RMSE≤0.0106), which suggested that the Jarvis model was more superior than the coupled model in describing the light response of stomatal conductance of red globe grape. Results obtained above could provide theoretical basis for the quantitative analysis of the stomatal regulation behavior of grape leaves and the calculation of photosynthetic productivity. |
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