You Chengming, Li Jihong, Yang Kaijun, Tan Bo, Yin Rui, Li Han, Zhang Li, Cui Xinglei, Liu Sining, Wang Lixia, Liu Yang, Chen Lianghua, Yuan Yaling, Li Jiao, Sardans Jordi, Zhang Jian, Xu Zhenfeng, Peñuelas Josep
Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province & National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River & Institute of Ecology and Forestry, Sichuan Agricultural University, Chengdu, 611130, China.
Global Ecology Unit CREAF-CSIC-UAB, CSIC, Bellaterra, 08193, Barcelona, Catalonia, Spain.
New Phytol. 2023 Jun;238(5):1838-1848. doi: 10.1111/nph.18870. Epub 2023 Mar 31.
Despite the vital role in carbon (C) sequestration and nutrient retention, variations and patterns in root C and nitrogen (N) stoichiometry of the first five root orders across woody plant species remains unclear. We compiled a dataset to explore variations and patterns of root C and N stoichiometry in the first five orders of 218 woody plant species. Across the five orders, root N concentrations were greater in deciduous, broadleaf, and arbuscular mycorrhizal species than in evergreen, coniferous species, and ectomycorrhizal association species, respectively. Contrasting trends were found for root C : N ratios. Most root branch orders showed clear latitudinal and altitudinal trends in root C and N stoichiometry. There were opposite patterns in N concentrations between latitude and altitude. Such variations were mainly driven by plant species, and climatic factors together. Our results indicate divergent C and N use strategies among plant types and convergence and divergence in the patterns of C and N stoichiometry between latitude and altitude across the first five root orders. These findings provide important data on the root economics spectrum and biogeochemical models to improve understanding and prediction of climate change effects on C and nutrient dynamics in terrestrial ecosystems.
尽管根系在碳（C）固存和养分保持中发挥着至关重要的作用，但木本植物物种前五个根序的根系碳氮（N）化学计量的变化和模式仍不清楚。我们汇编了一个数据集，以探索218种木本植物物种前五个根序中根系碳和氮化学计量的变化和模式。在这五个根序中，落叶、阔叶和丛枝菌根物种的根系氮浓度分别高于常绿、针叶物种和外生菌根关联物种。根系碳氮比呈现出相反的趋势。大多数根分支序在根系碳和氮化学计量方面表现出明显的纬度和海拔趋势。纬度和海拔之间的氮浓度模式相反。这种变化主要由植物物种和气候因素共同驱动。我们的结果表明，不同植物类型之间存在不同的碳氮利用策略，并且前五个根序在纬度和海拔之间的碳氮化学计量模式既有趋同又有差异。这些发现为根系经济谱和生物地球化学模型提供了重要数据，以增进对气候变化对陆地生态系统中碳和养分动态影响的理解和预测。
