Effects of atmospheric CO2 concentration, irradiance, and soil nitrogen availability on leaf photosynthetic traits of Polygonum sachalinense around natural CO2 springs in northern Japan

作者: Noriyuki Osada , Yusuke Onoda , Kouki Hikosaka

DOI: 10.1007/S00442-010-1635-Z

关键词: PolygonumSoil waterIrradianceBiologyBotanyCarbon dioxidePhotosynthesisSoil fertilityNutrientHerbaceous plantAgronomyEcology, Evolution, Behavior and Systematics

摘要: Long-term exposure to elevated CO2 concentration will affect the traits of wild plants in association with other environmental factors. We investigated multiple effects atmospheric concentration, irradiance, and soil N availability on leaf photosynthetic a herbaceous species, Polygonum sachalinense, growing around natural springs northern Japan. Atmospheric its interaction irradiance affected several traits. Leaf mass per unit area increased decreased increasing irradiance. at higher concentrations. The rate under growth conditions CO2, maximal velocity ribulose 1,5-bisphosphate carboxylation (Vcmax) was by N, suggesting that down-regulation photosynthesis more evident lower availability. ratio maximum electron transport Vcmax (Jmax/Vcmax) used efficiently for high concentrations changes partitioning. To what extent influenced plant depended As are subject wide range light nutrient availability, our results highlight importance these factors when evaluated.

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