Tree phytochemical diversity and herbivory are higher in the tropics

The datasets analyzed in the current study, including the output of the molecular network, sample-sample chemical structural and compositional similarity (entire metabolites and seven different biosynthetic pathways), plot-species-community data, and the phylogenetic tree of 206 tree species.The R material contains scripts to replicate the analyses from the manuscript, including calculating the chemical structural and compositional similarity (CSCS) index between samples, assessing the number of unique chemical compounds for each forest plot across three climatic zones, calculating chemical rarefaction and NMDS, quantifying the phylogenetic signal of PSM across species-level phylogeny, calculating the alpha, and beta (observed and null model) diversity at community-level, exploring the elevational pattern of herbivorous pressure.本研究分析的数据集涵盖分子网络输出结果、样本间化学结构与组成相似性（包含全部代谢物及7种不同生物合成途径）、样地-物种群落数据，以及206个树种的系统发育树。本研究附带的R语言材料包含复现本论文分析的脚本，具体包括计算样本间化学结构与组成相似性（chemical structural and compositional similarity, CSCS）指数、评估3个气候带内各森林样地的特有化合物数量、开展化学稀疏分析与非度量多维标度（NMDS）分析、量化物种水平系统发育树上植物次生代谢物（PSM）的系统发育信号、计算群落水平的α多样性与β多样性（包含观测模型与零模型），以及探究植食压力的海拔分布格局。