美国树木的地上碳储存对氮沉降的响应是异质性的,可能已经减弱

IF 8.1 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Christopher M. Clark, R. Quinn Thomas, Kevin J. Horn
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引用次数: 2

摘要

氮(N)供应量的变化会影响森林生态系统储存碳(C)的能力。在此,我们扩展了对 94 个树种和 120 万棵树的生长和存活情况的分析,以估算氮沉降对整个美国(CONUS)地上碳(dC/dN)变化的增量效应。我们发现,虽然氮沉降对美国大陆地上碳的平均影响是正的(dC/dN = 每千克氮+9 千克碳),但不同物种和地区之间的差异很大。此外,在美国东北部,我们可以将 2000-2016 年的响应与 1980-90 年代的响应进行比较,我们发现最近的 dC/dN 估计值弱于 1980-90 年代的估计值,原因是物种层面对氮沉降的响应发生了变化。这表明,美国森林的碳汇在不同森林之间差异很大,总体上可能正在减弱,因此可能需要采取比最初想象的更积极的气候政策。对2000年至2016年间美国毗连地区的树木清单和生长情况与20世纪80年代和90年代的数据进行的分析表明,长期的氮沉降可能不会持续刺激树木的碳储存。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Above-ground tree carbon storage in response to nitrogen deposition in the U.S. is heterogeneous and may have weakened

Above-ground tree carbon storage in response to nitrogen deposition in the U.S. is heterogeneous and may have weakened
Changes in nitrogen (N) availability affect the ability for forest ecosystems to store carbon (C). Here we extend an analysis of the growth and survival of 94 tree species and 1.2 million trees, to estimate the incremental effects of N deposition on changes in aboveground C (dC/dN) across the contiguous U.S. (CONUS). We find that although the average effect of N deposition on aboveground C is positive for the CONUS (dC/dN = +9 kg C per kg N), there is wide variation among species and regions. Furthermore, in the Northeastern U.S. where we may compare responses from 2000-2016 with those from the 1980s–90s, we find the recent estimate of dC/dN is weaker than from the 1980s–90s due to  species-level changes in responses to N deposition. This suggests that the U.S. forest C-sink varies widely across forests and may be weakening overall, possibly necessitating more aggressive climate policies than originally thought. Long-term nitrogen deposition may not provide sustained stimulation of tree carbon storage, suggest analyses of a tree inventory and growth for the contiguous US between 2000 and 2016, compared to data for the 1980s and 1990s.
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来源期刊
Communications Earth & Environment
Communications Earth & Environment Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
8.60
自引率
2.50%
发文量
269
审稿时长
26 weeks
期刊介绍: Communications Earth & Environment is an open access journal from Nature Portfolio publishing high-quality research, reviews and commentary in all areas of the Earth, environmental and planetary sciences. Research papers published by the journal represent significant advances that bring new insight to a specialized area in Earth science, planetary science or environmental science. Communications Earth & Environment has a 2-year impact factor of 7.9 (2022 Journal Citation Reports®). Articles published in the journal in 2022 were downloaded 1,412,858 times. Median time from submission to the first editorial decision is 8 days.
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