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Photosynthetic and Fluorescence Characteristics Responses of Zizania latifolia and Phragmites australis Leaves to Soil Continuous Drought
ZHAO Xiang-jiang,TIAN Kun,YANG Lan,LIU Hao
2015, 44(03):
181-187.
DOI: 10.3969/j.issn.1009-7791.2015.03.001
In the process of soil natural continuous drought, the photosynthetic characteristics, chlorophyll fluorescence parameters and corresponding soil moisture content of Zizania latifolia and Phragmites australis leaves were investigated to explore the photosynthetic physiological response of Z. latifolia and P. australis leaves to soil continuous drought stress. Pn, Tr, Gs of Z. latifolia leaves were first increasing and then decreasing, and those of P. australis leaves were gradually decreasing. Ci, Fv/Fm, NPQ, WUE, Yield, ETR and qP of Z. latifolia and P. australis leaves were the same change trend, Ci was gradually increasing, Fv/Fm, NPQ and WUE were first increasing and then decreasing, Yield, ETR and qP were gradually decreasing, with the soil moisture content gradually decreasing. It was showed that non-stomatal limitation was responsible for Pn reduction of Z. latifolia and P. australis leaves, confronting with severe drought stress. Drought stress threshold of Z. latifolia was between (2.17 ? 0.18)% and (1.66 ? 0.23)% of soil water content, that of P. australis was between (1.84 ? 0.17)% and (0.25 ? 0.07)% of soil water content, with 19% field capacity of growth substrate, available nitrogen, phosphorus and potassium of 28.14, 2.25 and 25.76 mg穔g-1 respectively, and pH 7.2.
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