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美国地上树木碳储量对氮沉降的响应是异质的，且可能已经减弱。

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

作者信息

Clark Christopher M, Thomas R Quinn, Horn Kevin J

机构信息

U.S. Environmental Protection Agency, Office of Research and Development, Washington, DC, USA.

Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, VA, USA.

出版信息

Commun Earth Environ. 2023 Feb 14;4(35):1-8. doi: 10.1038/s43247-023-00677-w.

DOI:10.1038/s43247-023-00677-w
PMID:37325084
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10262689/
Abstract

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.

摘要

氮（N）有效性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120万棵树木生长与存活情况的分析，以估算氮沉降对美国本土（CONUS）地上碳变化（dC/dN）的增量影响。我们发现，尽管氮沉降对美国本土地上碳的平均影响为正（dC/dN = 每千克氮增加9千克碳），但物种和地区之间存在很大差异。此外，在美国东北部，我们可以将2000 - 2016年的响应与20世纪80年代至90年代的响应进行比较，我们发现由于物种对氮沉降响应的变化，近期dC/dN的估算值比20世纪80年代至90年代的要弱。这表明美国森林碳汇在不同森林之间差异很大，并且可能总体上正在减弱，这可能需要比最初设想的更积极的气候政策。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/804b/10262689/4ba3f422b58c/nihms-1879583-f0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/804b/10262689/7a727bc9cab6/nihms-1879583-f0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/804b/10262689/c5976c6ecb53/nihms-1879583-f0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/804b/10262689/6a26d3fdd9df/nihms-1879583-f0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/804b/10262689/4ba3f422b58c/nihms-1879583-f0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/804b/10262689/7a727bc9cab6/nihms-1879583-f0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/804b/10262689/c5976c6ecb53/nihms-1879583-f0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/804b/10262689/6a26d3fdd9df/nihms-1879583-f0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/804b/10262689/4ba3f422b58c/nihms-1879583-f0004.jpg

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