文献类型： 外文期刊

作者： Gao, Meixia ¹ ; Zhu, Feifei ¹ ; Hobbie, Erik A. ⁵ ; Zhu, Weixing ¹ ; Li, Shanlong ⁷ ; Gurmesa, Geshere A. ¹ ; Wang, Ang ¹ ; Fang, Xiaoming ¹ ; Zhu, Jiaojun ¹ ; Gundersen, Per ⁸ ; Huang, Kai ¹ ; Wu, Zhou ¹ ; Fang, Yunting ¹ ;

作者机构： 1.Chinese Acad Sci, Inst Appl Ecol, CAS Key Lab Forest Ecol & Management, Shenyang 110016, Liaoning, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Qingyuan Forest CERN, Natl Observat & Res Stn, Shenyang 110016, Liaoning, Peoples R China

4.Key Lab Stable Isotope Tech & Applicat, Shenyang 110016, Liaoning, Peoples R China

5.Univ New Hampshire, Earth Syst Res Ctr, Morse Hall, Durham, NH 03824 USA

6.SUNY Binghamton, Dept Biol Sci, Binghamton, NY 13902 USA

7.Jilin Acad Agr Sci, Inst Agr Resources & Environm, Changchun, Jilin, Peoples R China

8.Univ Copenhagen, Dept Geosci & Nat Resource Management, Frederiksberg C, Denmark

关键词： carbon allocation; C-N response; litterfall production; nitrogen deposition; temperate forests; tree growth; woody biomass increment

期刊名称：PLANTS PEOPLE PLANET （ 影响因子：5.695； 五年影响因子：5.695 ）

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收录情况： SCI

摘要： 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. 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 increment to foliage litterfall production in the larch forest (by 34%). Literature data analysis also revealed greater N promotion on wood (24%) over foliage (9%) production. However, the positive effect on foliage diminished over time. These results combined imply that N deposition may promote tree growth in temperate and boreal regions and drive proportionally more photosynthate allocation into wood than leaves, thus may enhance forest C sequestration in the long run.