Stoichiometry and large-scale patterns of leaf carbon and nitrogen in the grassland biomes of China.

Oecologia
Jin-Sheng HeZhi Geng

Abstract

Nitrogen (N) and carbon-nitrogen (C:N) ratio are key foliar traits with great ecological importance, but their patterns across biomes have only recently been explored. We conducted a systematic census of foliar C, N and C:N ratio for 213 species, from 41 families over 199 research sites across the grassland biomes of China following the same protocol, to explore how different environmental conditions and species composition affect leaf N and C:N stoichiometry. Leaf C:N stoichiometry is stable in three distinct climatic regions in Inner Mongolia, the Tibetan Plateau, and Xinjiang Autonomous Region, despite considerable variations among co-existing species and among different vegetation types. Our results also show that life form and genus identity explain more than 70% of total variations of foliar N and C:N ratio, while mean growing season temperature and growing season precipitation explained only less than 3%. This suggests that, at the biome scale, temperature affects leaf N mainly through a change in plant species composition rather than via temperature itself. When our data were pooled with a global dataset, the previously observed positive correlation between leaf N and mean annual temperature (MAT) at very low MATs, disa...Continue Reading

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Citations

Feb 19, 2008·Oecologia·Jin-Sheng HeJingyun Fang
Dec 17, 2008·The New Phytologist·Jianyang Xia, Shiqiang Wan
Apr 6, 2019·Frontiers in Plant Science·Zhao FangHao-Tian Du
Jul 30, 2020·Ecology and Evolution·Yan-Ming GongGuang-Hui Lv
Jan 27, 2019·The Science of the Total Environment·Nigel V Gale, Sean C Thomas

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