亚北极冻土带荒原CO2通量对干旱的响应强于泥炭地

IF 10.8 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION
Valentin Heinzelmann, Julia Marinissen, Rien Aerts, J. Hans C. Cornelissen, Stef Bokhorst
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引用次数: 0

摘要

由于气候变化,干旱事件的频率和强度都在增加,对植物群落和生态系统功能造成了持久的影响。在亚北极地区,气候正在以高于全球平均水平的速度变化,对碳循环产生了放大效应。干旱引起的生产力和呼吸平衡的变化可能对这些地区的气候变化反馈产生重要影响。然而,人们对亚北极生态系统中的碳通量如何对干旱作出反应知之甚少,这阻碍了预测。在这里,我们测试了两种重要但截然不同的亚北极生态系统类型——泥炭地和苔原荒原——对实验性干旱的反应。昌盛被暴露于一个完整的降水排除7周,减少重量含水量66%和53%为水藓泥炭地和苔原heath,分别。干旱抑制了所有CO2通量组分。泥炭地和冻土带荒原的总初级生产力平均下降47%和64%,生态系统呼吸平均下降40%和53%。随着生态系统通量的增加,各生态系统类型中3种维管植物的叶片光合作用平均被抑制40%(泥炭地)和77%(苔原荒原)。干旱导致植物死亡率高,高达54%(泥炭地)和73%(苔原荒原)的死梢,这可能代表了在随后的生长季节抑制二氧化碳吸收的显著遗留效应。总之,冻土带的健康状况总体上比泥炭地对干旱更敏感。这种以前未被解释的不同敏感性在未来日益严重的干旱事件中可能很重要。考虑到苔原覆盖了亚北极陆地面积的一半以上,其干旱响应性可能导致北极二氧化碳净吸收总量的显著减少。这将使北极的碳平衡进一步向净二氧化碳源靠拢。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Stronger Drought Response of CO2 Fluxes in Tundra Heath Compared to Sphagnum Peatland in the Sub-Arctic

Stronger Drought Response of CO2 Fluxes in Tundra Heath Compared to Sphagnum Peatland in the Sub-Arctic

Stronger Drought Response of CO2 Fluxes in Tundra Heath Compared to Sphagnum Peatland in the Sub-Arctic

Drought events are increasing in frequency and intensity due to climate change, causing lasting impacts on plant communities and ecosystem functioning. In the sub-arctic, climate is changing at a rate above the global average with amplifying effects on the carbon cycle. Drought-induced shifts in the balance between productivity and respiration might have important implications for climate change feedbacks in these regions. However, little is known about how carbon fluxes in sub-arctic ecosystems respond to drought, hampering predictions. Here, we test how two important but contrasting sub-arctic ecosystem types, Sphagnum peatland and tundra heath, respond to experimental drought. Mesocosms were exposed to a full precipitation exclusion for 7 weeks, decreasing gravimetric water content by 66% and 53% for Sphagnum peatland and tundra heath, respectively. Drought suppressed all CO2 flux components. Gross primary productivity was on average reduced by 47% and 64%, and ecosystem respiration by 40% and 53% in Sphagnum peatland and tundra heath, respectively. Concomitantly with the ecosystem fluxes, leaf photosynthesis of the three most abundant vascular plant species per ecosystem type was on average suppressed by 40% (peatland) and 77% (tundra heath). Drought resulted in high plant mortality, with up to 54% (peatland) and 73% (tundra heath) dead shoots, which might represent a significant legacy effect suppressing CO2 uptake in subsequent growing seasons. In summary, tundra heath was overall more responsive to drought than peatland. This differential sensitivity, previously unaccounted for, might be important in the future under intensifying drought events. Considering that tundra heath covers more than half of the sub-arctic land area, its drought responsiveness might induce significant reductions in total arctic net CO2 uptake. This would move the arctic carbon balance further toward a net CO2 source.

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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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