Limited legacy effects of extreme multiyear drought on carbon and nitrogen cycling in a mesic grassland

IF 4.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Elementa-Science of the Anthropocene Pub Date : 2022-01-01 DOI:10.1525/elementa.2021.000093
Leena Vilonen, J. Blair, P. Trivedi, L. Zeglin, Melinda D. Smith
{"title":"Limited legacy effects of extreme multiyear drought on carbon and nitrogen cycling in a mesic grassland","authors":"Leena Vilonen, J. Blair, P. Trivedi, L. Zeglin, Melinda D. Smith","doi":"10.1525/elementa.2021.000093","DOIUrl":null,"url":null,"abstract":"The intensification of drought throughout the U.S. Great Plains has the potential to have large impacts on grassland functioning, as has been shown with dramatic losses of plant productivity annually. Yet, we have a poor understanding of how grassland functioning responds after drought ends. This study examined how belowground nutrient cycling responds after drought and whether legacy effects persist postdrought. We assessed the 2-year recovery of nutrient cycling processes following a 4-year experimental drought in a mesic grassland by comparing two different growing season drought treatments—chronic (each rainfall event reduced by 66%) and intense (all rain eliminated until 45% of annual rainfall was achieved)—to the control (ambient precipitation) treatment. At the beginning of the first growing season postdrought, we found that in situ soil CO2 efflux and laboratory-based soil microbial respiration were reduced by 42% and 22%, respectively, in the intense drought treatment compared to the control, but both measures had recovered by midseason (July) and remained similar to the control treatment in the second postdrought year. We also found that extractable soil ammonium and total inorganic N were elevated throughout the growing season in the first year after drought in the intense treatment. However, these differences in inorganic N pools did not persist during the growing season of the second year postdrought. The remaining measures of C and N cycling in both drought treatments showed no postdrought treatment effects. Thus, although we observed short-term legacy effects following the intense drought, C and N cycling returned to levels comparable to nondroughted grassland within a single growing season regardless of whether the drought was intense or chronic in nature. Overall, these results suggest that the key aspects of C and N cycling in mesic tallgrass prairie do not exhibit persistent legacies from 4 years of experimentally induced drought.","PeriodicalId":54279,"journal":{"name":"Elementa-Science of the Anthropocene","volume":null,"pages":null},"PeriodicalIF":4.7000,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Elementa-Science of the Anthropocene","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1525/elementa.2021.000093","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: 3

Abstract

The intensification of drought throughout the U.S. Great Plains has the potential to have large impacts on grassland functioning, as has been shown with dramatic losses of plant productivity annually. Yet, we have a poor understanding of how grassland functioning responds after drought ends. This study examined how belowground nutrient cycling responds after drought and whether legacy effects persist postdrought. We assessed the 2-year recovery of nutrient cycling processes following a 4-year experimental drought in a mesic grassland by comparing two different growing season drought treatments—chronic (each rainfall event reduced by 66%) and intense (all rain eliminated until 45% of annual rainfall was achieved)—to the control (ambient precipitation) treatment. At the beginning of the first growing season postdrought, we found that in situ soil CO2 efflux and laboratory-based soil microbial respiration were reduced by 42% and 22%, respectively, in the intense drought treatment compared to the control, but both measures had recovered by midseason (July) and remained similar to the control treatment in the second postdrought year. We also found that extractable soil ammonium and total inorganic N were elevated throughout the growing season in the first year after drought in the intense treatment. However, these differences in inorganic N pools did not persist during the growing season of the second year postdrought. The remaining measures of C and N cycling in both drought treatments showed no postdrought treatment effects. Thus, although we observed short-term legacy effects following the intense drought, C and N cycling returned to levels comparable to nondroughted grassland within a single growing season regardless of whether the drought was intense or chronic in nature. Overall, these results suggest that the key aspects of C and N cycling in mesic tallgrass prairie do not exhibit persistent legacies from 4 years of experimentally induced drought.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
多年极端干旱对中散草原碳氮循环的有限影响
整个美国大平原干旱的加剧有可能对草地的功能产生重大影响,正如每年植物生产力的巨大损失所显示的那样。然而,我们对干旱结束后草原功能的反应知之甚少。这项研究考察了干旱后地下养分循环的反应,以及干旱后遗留效应是否持续。我们通过比较两种不同的生长季节干旱处理——慢性(每次降雨减少66%)和强烈(所有降雨都消除,直到达到年降雨量的45%)-控制(环境降水)处理,评估了在4年实验干旱后的2年营养循环过程的恢复。在干旱后第一个生长季开始时,我们发现,与对照相比,强干旱处理的原位土壤CO2外排和实验室土壤微生物呼吸分别减少了42%和22%,但这两项措施在季中(7月)都有所恢复,并在干旱后第二年与对照处理保持相似。在干旱后的第一年,强化处理的土壤可提取铵态氮和全无机氮在整个生长季都有所升高。然而,在干旱后第二年的生长季节,无机氮库的这些差异并不持续。两种干旱处理的其余碳氮循环指标均未表现出干旱后处理的影响。因此,尽管我们观察到强烈干旱后的短期遗留效应,但无论干旱是强烈的还是慢性的,在一个生长季节内,C和N循环都恢复到与非干旱草地相当的水平。综上所述,这些结果表明,中叶高草草原碳氮循环的关键方面并没有表现出4年实验诱导干旱的持久遗产。
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 去求助
来源期刊
Elementa-Science of the Anthropocene
Elementa-Science of the Anthropocene Earth and Planetary Sciences-Atmospheric Science
CiteScore
6.90
自引率
5.10%
发文量
65
审稿时长
16 weeks
期刊介绍: A new open-access scientific journal, Elementa: Science of the Anthropocene publishes original research reporting on new knowledge of the Earth’s physical, chemical, and biological systems; interactions between human and natural systems; and steps that can be taken to mitigate and adapt to global change. Elementa reports on fundamental advancements in research organized initially into six knowledge domains, embracing the concept that basic knowledge can foster sustainable solutions for society. Elementa is published on an open-access, public-good basis—available freely and immediately to the world.
期刊最新文献
Spatiotemporal changes in Iranian rivers’ discharge Structure and function of the western Baffin Bay coastal and shelf ecosystem Agroecological transitions in the mind Temporal evolution of under-ice meltwater layers and false bottoms and their impact on summer Arctic sea ice mass balance Sea ice and snow characteristics from year-long transects at the MOSAiC Central Observatory
×
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
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 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 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1