GLOBAL DISTRIBUTION OF ROOT PROFILES IN TERRESTRIAL ECOSYSTEMS

Rooting depths were estimated from a global database of root profiles that was assembled from the primary literature to study relationships of abiotic and biotic factors associated with belowground vegetation structure. Variables used to characterize belowground vegetation structure include the depths above which 50% of all roots and 95% of all roots are located in the profile. For each root profile, information recorded includes latitude and longitude, elevation, soil texture, depth of organic horizons, type of roots measured (e.g., fine or total, live or dead), sampling methods, units of measurements (root mass, length, number, surface area), and sampling depth.

本研究依托从原始文献汇编得到的全球根系剖面数据库，对植物扎根深度进行估算，旨在探究与地下植被结构相关的非生物因子与生物因子之间的关联。用于表征地下植被结构的特征变量包括：剖面内总根系50%与95%累积分布对应的土层深度。针对每份根系剖面，所记录的信息包含经纬度、海拔、土壤质地、有机层厚度、被测根系类型（如细根或总根、活根或死根）、采样方法、测量单位（根系质量、长度、数量、表面积）以及采样深度。