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Phosphorus limitation on photosynthesis of two dominant understory species in a lowland tropical forest

Journal of Plant Ecology 2014年第6期7卷 526-534页

作者： Feifei Zhu Xiankai Lu Jiangming Mo Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesXingke RoadTianheGuangzhou 510650China Graduate University of the Chinese Academy of Sciences Yuquan RoadShijingshanBeijing 100049China

Aims Elevated nitrogen(N)deposition in tropical regions may accelerate ecosystem phosphorus(P)***,it is not explicitly addressed that how changes in soil N and P availability affect foliar nutrients and photosynthesis of plants in tropical *** this study,we examined the effects of N and P additions on foliar nutrients and net photosynthesis of two dominant understory species,Randia can-thioides(***)and Cryptocarya concinna(***)in an N-saturated old-growth tropical forest(>400-year-old)in south-ern *** A full factorial NP addition experiment(2×2)was established in 2007 and continued through August *** treatments,including control,N addition(150 kg N ha^(−1) year^(−1)),P addi-tion(150 kg P ha^(−1) year^(−1))and NP addition(150 kg N ha^(−1) year^(−1) plus 150 kg P ha^(−1) year^(−1))were set up in this *** traits maximum photosynthetic CO_(2) assimilation(Amax),stomatal conductance(gs),leaf transpiration(E),light satu-rating point,concentrations of chlorophyll a/b and foliar nutri-ents(N and P)of the two species were measured with standard *** Findings Three years of N addition had no significant effects on any measured photosynthetic parameter of either ***,N addition significantly elevated foliar N and P concentrations of one species(***),resulting in lower photosynthetic nitrogen use effi-ciency(PNUE).N treatments decreased foliar P concentration of the other(***),resulting in increased photosynthetic phos-phorus use efficiency,which was potentially related to N-induced P *** contrast,positive effects of P treatments on gs of ***-thioides,Amax and chlorophyll a+b of *** were observed.P treatments also elevated foliar P and PNUE of both species,imply-ing P induced more efficient use of *** results suggested a more important role of P than N on influencing photosynthetic traits of these two understory *** of P shorta

关键词： N saturation P limitation photosynthesis lowland tropical forests southern China

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