Effects of nitrogen deposition on carbon allocation between wood and leaves in temperate forests

作者：Meixia Gao, Feifei Zhu, Erik A. Hobbie, Weixing Zhu, Shanlong Li, Geshere Abdisa Gurmesa, Ang Wang, Xiao-Ming Fang, Jiaojun Zhu, Per Gundersen, Kai Huang, Wu Zhou, Yunting Fang · 发表于：Plants People Planet · 年份：2022 · DOI：10.1002/ppp3.10341 · 被引用次数：17 · 研究领域：Forest ecology and management、Plant Water Relations and Carbon Dynamics、Soil Carbon and Nitrogen Dynamics

Societal Impact Statement Increasing atmospheric nitrogen (N) deposition represents a major global change factor, but its long‐term effect on tree growth and carbon (C) sequestration remains uncertain. Our manipulation experiment and meta‐analysis reveal that N deposition in temperate and boreal forests promoted tree growth and the allocation of more C into wood than into leaves in China and worldwide. Thus, N deposition may increase forest C sequestration through enhanced wood production and distribution of C into stable sinks. In the context of achieving “Carbon Neutrality,” understanding how N deposition affect long‐term forest C sinks will help us with mitigation strategies under climate change. Summary Increased nitrogen (N) deposition is driving many temperate and boreal forests in the Northern Hemisphere towards N saturation. However, it is uncertain how long‐term N deposition affects tree growth and carbon (C) allocation in these forests. To investigate this, we treated temperate larch and mixed forests in northeastern China with N additions for 8 years. In addition, we collected data from 25 N‐addition experiments in temperate and boreal forests worldwide to reveal the overall effects of N on tree growth and C allocation. Nitrogen additions significantly promoted total biomass increment by 24% in both study forests, with on average additional 8 kg C per kg N gain into woody biomass over the study period. Nitrogen additions increased the ratio of woody biomass increme...