title: Effects of elevated carbon dioxide and nitrogen addition on foliar stoichiometry of nitrogen and phosphorus of five tree species in subtropical model forest ecosystems.
abstract: The effects of elevated carbon dioxide (CO2) and nitrogen (N) addition on foliar N and phosphorus (P) stoichiometry were investigated in five native tree species (four non-N2 fixers and one N2 fixer) in open-top chambers in southern China from 2005 to 2009. The high foliar N:P ratios induced by high foliar N and low foliar P indicate that plants may be more limited by P than by N. The changes in foliar N:P ratios were largely determined by P dynamics rather than N under both elevated CO2 and N addition. Foliar N:P ratios in the non-N2 fixers showed some negative responses to elevated CO2, while N addition reduced foliar N:P ratios in the N2 fixer. The results suggest that N addition would facilitate the N2 fixer rather than the non-N2 fixers to regulate the stoichiometric balance under elevated CO2.
authors.affiliation: Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Xingke Road 723, Tianhe District, Guangzhou 510650, China.
authors.forename: Wenjuan
authors.initials: W
authors.lastname: Huang
authors.forename: Guoyi
authors.initials: G
authors.lastname: Zhou
authors.forename: Juxiu
authors.initials: J
authors.lastname: Liu
authors.forename: Deqiang
authors.initials: D
authors.lastname: Zhang
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Xu
authors.forename: Shizhong
authors.initials: S
authors.lastname: Liu
mesh_terms: D000393:Air Pollutants / Q000378:metabolism / Q000633:toxicity*; D002245:Carbon Dioxide / Q000378:metabolism / Q000633:toxicity*; D002681:China; D017753:Ecosystem; D009584:Nitrogen / Q000378:metabolism / Q000633:toxicity*; D009586:Nitrogen Fixation / Q000187:drug effects; D010758:Phosphorus / Q000737:chemistry / Q000378:metabolism; D018515:Plant Leaves / Q000737:chemistry / Q000187:drug effects* / Q000378:metabolism; D014197:Trees / Q000737:chemistry / Q000187:drug effects* / Q000378:metabolism
chemical_list: D000393:Air Pollutants; D002245:Carbon Dioxide; D010758:Phosphorus; D009584:Nitrogen