GSTDTAP  > 气候变化
DOI10.1111/gcb.16076
Ecological thresholds under atmospheric nitrogen deposition for 1200 herbaceous species and 24 communities across the United States
Kayla Wilkins; Christopher Clark; Julian Aherne
2022-01-17
发表期刊Global Change Biology
出版年2022
英文摘要

Nitrogen (N) emissions and atmospheric deposition have increased significantly during the last century and become a stressor for many N-sensitive plant species. Understanding individual and community herbaceous plant species thresholds to atmospheric N deposition can inform emissions reduction policy. Here, we present results using Threshold Indicator Taxa Analysis (TITAN) applied to more than 1200 unique plant species and 24 vegetation communities (i.e., alliances) across the United States (US) to assess vulnerability to N deposition. Alliance-level thresholds (change points) for species decreasing in abundance along the gradient ranged from 1.8 to 14.3 kg N ha─1 year─1 and tended to be lower in the west than the east, which suggests that eastern communities, where N deposition has been historically higher, may have already lost many sensitive species. For the species that were present in more than one alliance, over half had a variable response to the N deposition gradient, suggesting that local factors affect vulnerability. Significant progress has been made during the past 30 years to reduce N emissions, which has reduced the percentage of plots at risk to N deposition from 72% to 35%. Nevertheless, over a third of plots remain at risk, and an average reduction of N deposition of 20% would protect half of the plots where N deposition exceeds community thresholds. Furthermore, the alliance- and species-level change points determined in this study may be used to inform N critical loads.

领域气候变化 ; 资源环境
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/346110
专题气候变化
资源环境科学
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GB/T 7714
Kayla Wilkins,Christopher Clark,Julian Aherne. Ecological thresholds under atmospheric nitrogen deposition for 1200 herbaceous species and 24 communities across the United States[J]. Global Change Biology,2022.
APA Kayla Wilkins,Christopher Clark,&Julian Aherne.(2022).Ecological thresholds under atmospheric nitrogen deposition for 1200 herbaceous species and 24 communities across the United States.Global Change Biology.
MLA Kayla Wilkins,et al."Ecological thresholds under atmospheric nitrogen deposition for 1200 herbaceous species and 24 communities across the United States".Global Change Biology (2022).
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