Arctic shrub root traits, northern Alaska, summer 2017 (Version 2.0)

This data package contains root trait data collected from 170 plots of rapidly expanding shrub genera (Alnus, Betula, and Salix) and a widespread sedge (Eriophorum vaginatum) along a latitudinal and temperature gradient in northern Alaska. The trait data were collected in July 2017 and include root architecture (root diameter and branching patterns), mycorrhizal colonization (%), nitrogen concentration (%), delta 15N (per mil), and vertical root biomass. These raw data support a submitted manuscript that examines the distribution and interspecific variations of absorptive root traits of shrubs and graminoids across the graminoid-dominated nutrient-poor arctic tundra and reveals how deciduous shrub expansion affects plant nutrient acquisition strategies in tundra ecosystems. Data are presented by site (n=5) and patch (shrub or sedge plot) in separate csv files. The location data are provided in the “plot coordinates” file; all other files contain the data in the file title. Detailed methods are in Chen et al. (2020). 2023/07/20 Update: The latest version of this dataset publication is version 2.0. The latest version of the data package was updated to include the alder nodule biomass dataset (alder nodule biomass.csv) and associated metadata (metadata_alder nodule biomass.csv). The name of the previous metadata file was updated (metadata_ root traits and biomass.csv ) to distinguish it from the new metadata file.

本数据包包含采集自阿拉斯加北部沿纬度与温度梯度布设的170个样地的根系性状数据，研究对象为快速扩张的灌木类群（桤木属Alnus、桦木属Betula、柳属Salix）以及广布的莎草（羊胡子草Eriophorum vaginatum）。该性状数据采集于2017年7月，涵盖根系构型（根直径与分枝模式）、菌根侵染率（%）、氮浓度（%）、δ¹⁵N（千分比）以及垂直根系生物量。本原始数据支撑一篇已投稿的论文，该论文针对以禾草类为主的贫营养北极苔原，探究灌木与禾草类植物吸收根性状的分布格局及种间差异，并揭示落叶灌木扩张如何影响苔原生态系统中的植物养分获取策略。数据按样地（n=5）与斑块（灌木或莎草样地）分类存储于独立的CSV文件中。点位信息存储于名为"plot coordinates"的文件中；其余所有文件的数据内容可通过其文件名直接识别。详细的实验方法参见Chen等人（2020）的研究。2023年7月20日更新说明：本数据集的最新发布版本为2.0版。本次数据包更新新增了桤木根瘤生物量数据集（alder nodule biomass.csv）及其关联元数据文件（metadata_alder nodule biomass.csv）；原元数据文件（metadata_ root traits and biomass.csv）已重命名，以区分于新增的元数据文件。