美国140种树种生长和生存对大气氮和硫沉积响应的区域差异。

IF 2.7 3区 农林科学 Q2 ECOLOGY
Rebecca M Dalton, Jesse N Miller, Tara Greaver, Robert D Sabo, Kemen G Austin, Jennifer N Phelan, R Quinn Thomas, Christopher M Clark
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引用次数: 0

摘要

大气中氮(N)和硫(S)的沉降通过改变营养库、土壤酸化和生物相互作用来改变树木的人口统计学过程。以前的工作建立了美国(CONUS)数据中树木生长和生存对大气N和S沉积的响应;但是,不可能用这种方法评价各区域反应的差异。在这项研究中,我们建立了在美国空间划分区域内大约140种物种对氮和硫沉积的生长和生存响应的物种和区域特定关系。我们分别计算了美国森林服务局(USFS) 11个部门对氮和硫沉积的响应,分别得出了241种和268种x部门的生长和生存组合。然后,我们将这些关系划分为广泛的脆弱性类别,并使用有序逻辑回归来探索与生长和生存对N和S沉积的脆弱性相关的协变量。与早期的研究一样,我们发现不同物种对空气污染的生长和生存反应不同;但在这项研究中,我们发现45%-70%的物种反应在不同地区也存在空间差异。物种响应的区域差异不仅与大气氮、硫沉降有关,还与降水、土壤pH、菌根结合力和落叶率等区域效应有关。大量的变异仍未得到解释(解释的总变异在6.8%-13.8%之间),这表明这些或其他因素可能在更精细的空间尺度上起作用。综上所述,我们的研究结果表明,树种响应的区域差异对设定临界负荷目标具有重要意义,因为临界负荷现在可以在管理相关的尺度上为特定物种量身定制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Regional variation in growth and survival responses to atmospheric nitrogen and sulfur deposition for 140 tree species across the United States.

Atmospheric deposition of nitrogen (N) and sulfur (S) alter tree demographic processes via changes in nutrient pools, soil acidification, and biotic interactions. Previous work established tree growth and survival response to atmospheric N and S deposition in the conterminous United States (CONUS) data by species; however, it was not possible to evaluate regional variation in response using that approach. In this study, we develop species- and region-specific relationships for growth and survival responses to N and S deposition for roughly 140 species within spatially demarcated regions of the U.S. We calculated responses to N and S deposition separately for 11 United States Forest Service (USFS) Divisions resulting in a total of 241 and 268 species × Division combinations for growth and survival, respectively. We then assigned these relationships into broad categories of vulnerability and used ordinal logistic regressions to explore the covariates associated with vulnerability in growth and survival to N and S deposition. As with earlier studies, we found growth and survival responses to air pollution differed by species; but new to this study, we found 45%-70% of species responses also varied spatially across regions. The regional variation in species responses was not simply related to atmospheric N and S deposition, but was also associated with regional effects from precipitation, soil pH, mycorrhizal association, and deciduousness. A large amount of the variance remained unexplained (total variation explained ranged from 6.8%-13.8%), suggesting that these or additional factors may operate at finer spatial scales. Taken together, our results demonstrate that regional variation in tree species' response has significant implications for setting critical load targets, as critical loads can now be tailored for specific species at management-relevant scales.

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来源期刊
CiteScore
4.50
自引率
6.20%
发文量
256
审稿时长
12 weeks
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