Leaf nitrogen:phosphorus stoichiometry across Chinese grassland biomes.

Leaf nitrogen:phosphorus stoichiometry across Chinese grassland biomes. Research Abstract Details 

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Leaf nitrogen:phosphorus stoichiometry across Chinese grassland biomes. Abstract Text:

Jin-Sheng He,Liang Wang,Dan F B Flynn,Xiangping Wang,Wenhong Ma,Jingyun Fang,

Leaf N and P stoichiometry covaries with many aspects of plant biology, yet the drivers of this trait at biogeographic scales remain uncertain. Recently we reported the patterns of leaf C and N based on systematic census of 213 species over 199 research sites in the grassland biomes of China. With the expanded analysis of leaf P, here we report patterns of leaf P and N:P ratios, and analyze the relative contribution of climatic variables and phylogeny in structuring patterns of leaf N:P stoichiometry. Average values of leaf P and N:P ratio were 1.9 mg g(-1) and 15.3 (mass ratio), respectively, consistent with the previous observation of a higher N:P ratio in China's flora than the global averages (ca. 13.8), resulting from a lower leaf P. Climatic variables had very little direct correlation with leaf P and N:P ratios, with growing season precipitation and temperature together explaining less than 2% of the variation, while inter-site differences and within-site phylogenetic variation explained 55 and 26% of the total variation in leaf P and N:P ratios. Across all sites and species, leaf N and P were highly positively correlated at all levels. However, the within-site, within-species covariations of leaf N and P were weaker than those across sites and across species. Leaf N and P relationships are driven by both variation between sites at the landscape scale (explaining 58% of the variance) and within sites at the local scale (explaining 24%), while the climatic factors exerted limited influence (explaining less than 3%). In addition, leaf N:P ratios in two dominant genera Kobresia and Stipa had different responses to precipitation. This study suggests that geographic variation and between-species variation, rather than climatic variation, are the major determinants of grassland foliar stoichiometry at the biome level.

Leaf nitrogen:phosphorus stoichiometry across Chinese grassland biomes. Publishing Authors By Initials

JS He,L Wang,DF Flynn,X Wang,W Ma,J Fang,

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Leaf nitrogen:phosphorus stoichiometry across Chinese grassland biomes. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Oecologia

VOLUME: 155

Page Numbers: 301-10

Journal Abbreviation: Oecologia

ISSN: 0029-8549

DAY: 16

MONTH: 11

YEAR: 2007

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LANGUAGE: eng

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AFFILIATION: Department of Ecology, Peking University, 5 Yiheyuan Road, 100871, Beijing, China, jshe@pku.edu.cn.

Country: Germany

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MEDLINETA: Oecologia

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