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Leaf Carbon,Nitrogen and Phosphorus Stoichiometry across Plant Species in Beijing and Its Periphery

HAN Wenxuan1,2,WU Yi1,TANG Luying1,CHEN Yahan1,3,LI Liping1,HE Jinsheng1,FANG Jingyun11.Department of Ecology,and Key Laboratory for Earth Surface Processes of the Ministry of Education,Peking University,Beijing 100871;2.College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193;3.Shenzhen Graduate School of Peking University,Shenzhen 518055  
Based on a systematic field sampling and lab measurements of 358 native species,the regional stoichiometric patterns of leaf C,N and P in Beijing and its periphery were investigated.The geometric means of leaf C,N and P are 45.1%,2.61% and 0.20%(dry weight),respectively.The content ratios of lamina C,N and P to their petiole counterparts are 1.1,2.4 and 1.8 for C,N and P,respectively,as reflects the stoichiometric relationship between lamina and petiole.Herbs have higher leaf N and P and lower C than woody plants;conifers are significantly lower in leaf N(or higher in leaf C),compared with broadleaves,but there is no significant difference in leaf P between the two growth-forms.Leaf C,N and P are correlated significantly between each other across all species or within growth-forms,with positive relationship between N and P,and negative between C and N(P).The geometric mean mass ratios of leaf C∶N,C∶P and N∶P are 17.3,242 and 13.9,respectively.
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