Peatland Plant Community Changes in Annual Production and Composition Through 8 Years of Warming Manipulations Under Ambient and Elevated CO2 Atmospheres

IF 3.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
P. J. Hanson, N. A. Griffiths, V. G. Salmon, J. M. Birkebak, J. M. Warren, J. R. Phillips, M. P. Guilliams, K. C. Oleheiser, M. W. Jones, N. J. Jones, J. Enterkine, N. F. Glenn, K. J. Pearson
{"title":"Peatland Plant Community Changes in Annual Production and Composition Through 8 Years of Warming Manipulations Under Ambient and Elevated CO2 Atmospheres","authors":"P. J. Hanson,&nbsp;N. A. Griffiths,&nbsp;V. G. Salmon,&nbsp;J. M. Birkebak,&nbsp;J. M. Warren,&nbsp;J. R. Phillips,&nbsp;M. P. Guilliams,&nbsp;K. C. Oleheiser,&nbsp;M. W. Jones,&nbsp;N. J. Jones,&nbsp;J. Enterkine,&nbsp;N. F. Glenn,&nbsp;K. J. Pearson","doi":"10.1029/2024JG008511","DOIUrl":null,"url":null,"abstract":"<p>The Spruce and Peatland Responses Under Changing Environments (SPRUCE) experiment has operated five whole-ecosystem warming manipulations (+0, +2.25, +4.5, +6.75, and +9°C) with paired ambient and elevated CO<sub>2</sub> atmospheres (eCO<sub>2</sub>, +500 ppm) for 8 full calendar years (since August 2015). We tracked shrub-layer vegetation responses to the treatments using annual destructive plot sampling. Tree (<i>Picea</i> and <i>Larix</i>) responses were assessed annually using nondestructive dimensional analyses and allometric conversions. Shrub community changes were assessed for key ericaceous shrubs (<i>Rhododendron, Chamaedaphne,</i> and <i>Kalmia</i>), two <i>Vaccinium</i> species (<i>V. angustifolium, V. oxycoccos</i>), graminoid species (mostly <i>Eriophorum</i>), and one common forb (<i>Maianthemum trifolium</i>), plus minor understory species. We tracked annual aboveground net primary production (ANPP) for vascular plant species in gC m<sup>−2</sup> y<sup>−1</sup> and overall stand contribution in dry mass. We observed a linear increase in shrub-layer aboveground biomass accumulation with warming over time due primarily to an increase in ericaceous shrub abundance. Cumulative biomass increases across the shrub community showed overall positive responses to eCO<sub>2</sub> after 8 years. Community composition also changed with warming, with increases in woody shrub density, and the reduction or loss of forbs. The tree community showed minimal initial responses to warming early in the treatments, but since 2020, has shown significant increases in ANPP and individual tree growth with warming. The main driver of change in the vascular plant community was temperature, with less pronounced effects of eCO<sub>2</sub> evident. These results indicate an overall increase in ANPP with warming from both the tree and shrub layers of peatland vegetation.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7000,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008511","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Geophysical Research: Biogeosciences","FirstCategoryId":"93","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2024JG008511","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0

Abstract

The Spruce and Peatland Responses Under Changing Environments (SPRUCE) experiment has operated five whole-ecosystem warming manipulations (+0, +2.25, +4.5, +6.75, and +9°C) with paired ambient and elevated CO2 atmospheres (eCO2, +500 ppm) for 8 full calendar years (since August 2015). We tracked shrub-layer vegetation responses to the treatments using annual destructive plot sampling. Tree (Picea and Larix) responses were assessed annually using nondestructive dimensional analyses and allometric conversions. Shrub community changes were assessed for key ericaceous shrubs (Rhododendron, Chamaedaphne, and Kalmia), two Vaccinium species (V. angustifolium, V. oxycoccos), graminoid species (mostly Eriophorum), and one common forb (Maianthemum trifolium), plus minor understory species. We tracked annual aboveground net primary production (ANPP) for vascular plant species in gC m−2 y−1 and overall stand contribution in dry mass. We observed a linear increase in shrub-layer aboveground biomass accumulation with warming over time due primarily to an increase in ericaceous shrub abundance. Cumulative biomass increases across the shrub community showed overall positive responses to eCO2 after 8 years. Community composition also changed with warming, with increases in woody shrub density, and the reduction or loss of forbs. The tree community showed minimal initial responses to warming early in the treatments, but since 2020, has shown significant increases in ANPP and individual tree growth with warming. The main driver of change in the vascular plant community was temperature, with less pronounced effects of eCO2 evident. These results indicate an overall increase in ANPP with warming from both the tree and shrub layers of peatland vegetation.

Abstract Image

8年增温处理下泥炭地植物群落年产量和组成的变化
变化环境下的云杉和泥炭地响应(Spruce)实验在8个完整日历年(自2015年8月以来)中运行了5个全生态系统变暖操作(+0、+2.25、+4.5、+6.75和+9°C),并对环境和升高的CO2大气(eCO2, +500 ppm)进行了配对。采用年度破坏性样地抽样方法,跟踪了灌丛层植被对不同处理的响应。树木(云杉和落叶松)的响应每年使用无损量纲分析和异速生长转换进行评估。灌木群落的变化主要包括关键的杜鹃花(Rhododendron)、Chamaedaphne (Chamaedaphne)和Kalmia (Kalmia), 2种禾本科植物(V. angustifolium)和oxycoccos (V. oxycoccos), 1种禾本科植物(主要是Eriophorum), 1种常见的蕨类植物(Maianthemum trifolium),以及少量的林下植物。研究了维管植物的年地上净初级生产量(ANPP)和林分对干质量的贡献。我们观察到,随着时间的推移,灌丛层地上生物量积累呈线性增加,这主要是由于白垩灌木丰度的增加。8年后,灌木群落累积生物量对eCO2总体呈正响应。群落组成也随着气候变暖、木本灌木密度的增加和草本植物的减少或消失而变化。在处理早期,树木群落对变暖的初始反应最小,但自2020年以来,随着变暖,树木的ANPP和单株生长显著增加。维管植物群落变化的主要驱动力是温度,而eCO2的影响不明显。这些结果表明,随着气候变暖,泥炭地植被的乔木和灌木层的ANPP总体上都有所增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Journal of Geophysical Research: Biogeosciences
Journal of Geophysical Research: Biogeosciences Earth and Planetary Sciences-Paleontology
CiteScore
6.60
自引率
5.40%
发文量
242
期刊介绍: JGR-Biogeosciences focuses on biogeosciences of the Earth system in the past, present, and future and the extension of this research to planetary studies. The emerging field of biogeosciences spans the intellectual interface between biology and the geosciences and attempts to understand the functions of the Earth system across multiple spatial and temporal scales. Studies in biogeosciences may use multiple lines of evidence drawn from diverse fields to gain a holistic understanding of terrestrial, freshwater, and marine ecosystems and extreme environments. Specific topics within the scope of the section include process-based theoretical, experimental, and field studies of biogeochemistry, biogeophysics, atmosphere-, land-, and ocean-ecosystem interactions, biomineralization, life in extreme environments, astrobiology, microbial processes, geomicrobiology, and evolutionary geobiology
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信