title: Taxonomic identity, phylogeny, climate and soil fertility as drivers of leaf traits across Chinese grassland biomes.
abstract: Although broad-scale inter-specific patterns of leaf traits are influenced by climate, soil, and taxonomic identity, integrated assessments of these drivers remain rare. Here, we quantify these drivers in a field study of 171 plant species in 174 sites across Chinese grasslands, including the Tibetan Plateau, Inner Mongolia, and Xinjiang. General linear models were used to partition leaf trait variation. Of the total variation in leaf traits, on average 27% is due to taxonomic or phylogenetic differences among species within sites (pure species effect), 29% to variation among sites within species (pure site effect), 38% to joint effects of taxonomic and environmental factors (shared effect), and 6.2% to within-site and within-species variation. Examining the pure site effect, climate explained 7.8%, soil explained 7.4%, and climate and soil variables together accounted for 11%, leaving 18% of the inter-site variation due to factors other than climate or soil. The results do not support the hypothesis that soil fertility is the "missing link" to explain leaf trait variation unexplained by climatic factors. Climate- and soil-induced leaf adaptations occur mostly among species, and leaf traits vary little within species in Chinese grassland plants, despite strongly varying climate and soil conditions.
authors.affiliation: Department of Ecology, Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, 5 Yiheyuan Road, 100871, Beijing, China. jshe@pku.edu.cn
authors.forename: Jin-Sheng
authors.initials: JS
authors.lastname: He
authors.forename: Xiangping
authors.initials: X
authors.lastname: Wang
authors.forename: Bernhard
authors.initials: B
authors.lastname: Schmid
authors.forename: Dan F B
authors.initials: DF
authors.lastname: Flynn
authors.forename: Xuefei
authors.initials: X
authors.lastname: Li
authors.forename: Peter B
authors.initials: PB
authors.lastname: Reich
authors.forename: Jingyun
authors.initials: J
authors.lastname: Fang
mesh_terms: D002681:China; D002980:Climate; D017753:Ecosystem; D016014:Linear Models; D010788:Photosynthesis; D010802:Phylogeny; D018515:Plant Leaves / Q000033:anatomy & histology*; D006109:Poaceae / Q000033:anatomy & histology / Q000145:classification* / Q000235:genetics*; D019655:Quantitative Trait, Heritable; D012987:Soil; D013045:Species Specificity
chemical_list: D012987:Soil