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In the process of soil gradual drought, the growth of typical wetland plant Acorus calamus in dry condition and control condition were investigated. The soil water contents of dry group were about 55% (0 th day) , 40% (3 th day) , 30% (6 th day) , 20% (9 th day) , 10% (11 th day) and 5% (12 th day) and average soil water content of the control group was (53. 49依0. 6) % during the experiment period. Meanwhile, Photosystem 域 (PS域) photochemical efficiency (Fv / Fm) , quantum yield (Yield) , photochemical quenching (qP) , non鄄photochemical quenching (qN) were also measured by a submersible, pulse鄄amplitude modulated (PAM) fluorometer: Diving鄄PAM.

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