生物群落
磷
温带气候
生态学
北方的
泰加语
环境科学
木本植物
生态系统
亚热带
温带森林
植被(病理学)
断面积
纬度
生物
地理
化学
医学
病理
有机化学
大地测量学
作者
Helena Vallicrosa,Jordi Sardans,Joan Maspons,Josep Peñuelas,José Eduardo Meireles
摘要
Abstract Aim The aim was to create global maps of foliar nitrogen‐to‐phosphorus (N:P) ratios across ecosystems, based on modelled climate, soil, and N and P deposition data, to identify global drivers of woody vegetation N:P ratios and to explore the role of genetic legacy (phylogenetics) in foliar N:P ratios of woody plants. Location Woody cover globally. Time period Present; data collected from 1990 to 2016. Major taxa studied Woody plants. Methods We compiled a database of 20,851 foliar N:P records and assigned them into boreal, temperate coniferous, temperate broadleaved and tropical groups. We applied neural networks to predict N:P global distribution maps, generalized linear models to assess environmental drivers and generalized linear mixed models to disentangle the effect of genetic legacy. Results and main conclusions Foliar N:P ratios are negatively associated with latitude, with higher N:P ratios occurring in tropical forests and lower N:P ratios in boreal forests. Globally, N:P ratios indicate greater levels of P limitation than N limitation. The influence of environmental factors varied among the four forest biomes, probably owing to contrasting combined environmental conditions; this finding would have been obscured had we conducted a single “forest biome” analysis. Genetic legacy explained significant variation in woody plant foliar N:P ratios, and we suggest its inclusion in future studies to improve N:P ratio predictions.
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