Lowland tundra plant stoichiometry is somewhat resilient decades following fire despite substantial and sustained shifts in community structure

Lowland tundra plant stoichiometry is somewhat resilient decades following fire despite substantial and sustained shifts in community structure
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尽管群落结构发生了实质性和持续性的变化,低地苔原植物化学计量在火灾发生后几十年仍具有一定的弹性

DOI:
10.1080/15230430.2022.2121246
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发表时间:
2022
期刊:
and Alpine Research
影响因子:
--
通讯作者:
Sistla, Seeta A.
Sistla, Seeta A.
中科院分区:
--
文献类型:
--
作者:
Baillargeon, Natalie;Pold, Grace;Natali, Susan M.;Sistla, Seeta A.

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北极正经历全球平均地表温度增幅最大的地区,预计这将加剧野火的频率和严重程度。野火改变了北极生态系统的生物地球化学特征。然而,随着时间的推移,这些变化的程度——特别是相对于群落结构的植物化学计量——并没有得到很好的记录。阿拉斯加育空-库斯科奎姆三角洲经历了最严重的火灾季节四年后,在不同的燃烧历史梯度中收获了地上植物和地衣生物量:未燃烧(“参考”)、2015年燃烧(“近期燃烧”)和1972年燃烧(“历史燃烧”),以评估苔原植物群落对火灾干扰的恢复能力。最近的火灾减少了地上生物量;早期恢复的特点是常绿灌木和禾本科植物占主导地位。在历史性的燃烧中,尽管地衣生物量持续减少,地上生物量仍接近参考条件。尽管火灾后植物和地衣总碳 (C) 和氮 (N) 立即减少,但氮储量更大程度地恢复,从而减少了群落水平的 C:N。值得注意的是,在物种层面,仅在最近的燃烧中观察到氮富集。然而,火灾后数十年群落重建持续存在,反映出相对于富含氮的维管束植物物种,贫氮地衣持续减少。
The Arctic is experiencing the greatest increase in average surface temperature globally, which is projected to amplify wildfire frequency and severity. Wildfire alters the biogeochemical characteristics of arctic ecosystems. However, the extent of these changes over time—particularly with regard to plant stoichiometries relative to community structure—is not well documented. Four years after the Yukon-Kuskokwim Delta, Alaska, experienced its largest fire season, aboveground plant and lichen biomass was harvested across a gradient of burn history: unburned (“reference”), 2015 burn (“recent burn”), and 1972 burn (“historic burn”) to assess the resilience of tundra plant communities to fire disturbance. Fire reduced aboveground biomass in the recent burn; early recovery was characterized by evergreen shrub and graminoid dominance. In the historic burn, aboveground biomass approached reference conditions despite a sustained reduction of lichen biomass. Although total plant and lichen carbon (C) and nitrogen (N) were reduced immediately following fire, N stocks recovered to a greater degree—reducing community-level C:N. Notably, at the species level, N enrichment was observed only in the recent burn. Yet, community restructuring persisted for decades following fire, reflecting a sustained reduction in N-poor lichens relative to more N-rich vascular plant species.
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