Keys to the global treeline formation: thermal limit for its position and moisture for the taxon-specific variation

Process datasets and R codes for "Keys to the global treeline formation: thermal limit for its position and moisture for the taxon-specific variation".In the "data" folder:Treeline_taxa. csv: core analytical data, conducted based on the dataset of over 2,000 treeline species records, including the extraction of required environmental indicators and PCA-based environmental dimension scores from the original treeline locations and species records.ALL_Genus_GBIF. csv: the global occurrence records of all treeline species found in the GBIF database (as of January 2024), including the extraction of required environmental indicators.TL_and_GBIF_PCA. csv: the integration of treeline point data and their respective global occurrence records in GBIF, including the extraction of required environmental indicators and PCA-based environmental dimension scores from the original treeline locations and species records.pts_around_TL. csv: the sample point data constructed within the buffer zone around the treeline points for analysis using the Generalized Linear Mixed Model. including the extraction of required environmental indicators.pts_around_TL_PCA_RDO. csv: the sample point data constructed within the buffer zone around the treeline points as the dataset above. including the extraction of required environmental indicators, PCA-based environmental dimension scores and the RDO value at both genus and species levels.mountain_stat. csv: summary statistics at the mountain scale.RDO threshold point_genus. csv: intermediate results of genus-level RDO threshold calculation.Treeline_taxa_3theoretical_thres. csv: based on "Treeline_taxa. csv", integrates the potential treeline elevation defined by growing season temperature for each treeline point, elevation of the growth boundary defined by the ecological niche model, and the theoretical treeline elevation defined by the RDO.Tree_TLSP. tre: phylogenetic tree of all species.Tree_TLSP_GENUS. tre: phylogenetic tree at genus level.RDO_treeline_raster_pts folder: point shapefile for calculation theoretical treeline elevation defined by the RDO.RDO-defind folder: results for theoretical treeline elevation defined by the RDO for each genus.maxent_result folder: results for ecological niche model for each genus.potential treeline range. tif: potential treeline range defined by growing season temperature.<br>

本数据集为论文《全球林线形成的关键因子：林线位置的温度限制与类群特异性变异的水分调控》配套的处理数据集与R代码。
在「data」文件夹内包含以下内容：
Treeline_taxa.csv：核心分析数据集，基于2000余条林线物种记录构建，涵盖从原始林线点位与物种记录中提取的必要环境指标，以及基于主成分分析（PCA，Principal Component Analysis）得到的环境维度得分。
ALL_Genus_GBIF.csv：GBIF（全球生物多样性信息设施，Global Biodiversity Information Facility）数据库中截至2024年1月收录的全部林线物种全球出现记录，包含必要环境指标的提取结果。
TL_and_GBIF_PCA.csv：林线点位数据与对应GBIF全球出现记录的整合数据集，涵盖从原始林线点位与物种记录中提取的必要环境指标，以及基于主成分分析得到的环境维度得分。
pts_around_TL.csv：在林线点位周边缓冲区构建的样本点数据集，用于广义线性混合模型（Generalized Linear Mixed Model, GLMM）分析，包含必要环境指标的提取结果。
pts_around_TL_PCA_RDO.csv：与上述缓冲区样本点数据集同类的数据集，包含必要环境指标的提取结果、基于主成分分析的环境维度得分，以及属级与物种级的RDO值。
mountain_stat.csv：山地尺度的汇总统计数据集。
RDO threshold point_genus.csv：属级RDO阈值计算的中间结果文件。
Treeline_taxa_3theoretical_thres.csv：基于Treeline_taxa.csv数据集，整合了各林线点位的生长季温度潜在林线高程、生态位模型定义的生长边界高程，以及RDO定义的理论林线高程。
Tree_TLSP.tre：所有物种的系统发育树文件。
Tree_TLSP_GENUS.tre：属级系统发育树文件。
RDO_treeline_raster_pts文件夹：用于计算RDO定义的理论林线高程的点形状文件（shapefile）存储文件夹。
RDO-defind文件夹：各属的RDO定义理论林线高程结果存储文件夹。
maxent_result文件夹：各属的生态位模型分析结果存储文件夹。
potential treeline range.tif：基于生长季温度定义的潜在林线范围栅格文件。