干旱区生态环境知识资源中心(Arid): Climatic Controls on Soil Carbon Accumulation and Loss in a Dryland Ecosystems

Arid

DOI	10.1029/2021JG006492
	Climatic Controls on Soil Carbon Accumulation and Loss in a Dryland Ecosystems
	Waring, Bonnie G.; Smith, Kenneth R.; Grote, Edmund E.; Howell, Armin; Reibold, Robin; Tucker, Colin L.; Reed, Sasha C.
通讯作者	Waring, BG (corresponding author)，Utah State Univ, Dept Biol, Logan, UT 84322 USA. ; Waring, BG (corresponding author)，Utah State Univ, Ctr Ecol, Logan, UT 84322 USA. ; Waring, BG (corresponding author)，Imperial Coll London, Grantham Inst Climate Change & Environm, London, England.
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN	2169-8953
EISSN	2169-8961
出版年	2021
卷号	126 期号:12
英文摘要	Arid and semiarid ecosystems drive year-to-year variability in the strength of the terrestrial carbon (C) sink, yet there is uncertainty about how soil C gains and losses contribute to this variation. To address this knowledge gap, we embedded C-depleted soil mesocosms, containing litter or biocrust C inputs, within an in situ dryland ecosystem warming experiment. Over the course of one year, changes in microbial biomass and total soil organic C pools were monitored alongside hourly measurements of soil CO2 flux. We also developed a biogeochemical model to explore the mechanisms that gave rise to observed soil C dynamics. Field data and model simulations demonstrated that water exerted much stronger control on soil biogeochemistry than temperature, with precipitation events triggering large CO2 pulses and transport of litter- and biocrust-derived C into the soil profile. We expected leaching of organic matter would result in steady accumulation of C within the mineral soil over time. Instead, the size of the total organic C pool fluctuated throughout the year, largely in response to microbial growth: increases in the size of microbial biomass were negatively correlated with the quantity of C residing in the top 2 cm, where most biogeochemical changes were observed. Our data and models suggest that microbial responses to precipitation events trigger rapid metabolism of dissolved organic C inputs, which strongly limit accumulation of autotroph-derived C belowground. Accordingly, changes in the magnitude and/or frequency of precipitation events in this dryland ecosystem could have profound impacts on the strength of the soil C sink.
英文关键词	biological soil crust desert dryland litter precipitation soil carbon soil respiration warming experiment
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000734472100024
WOS关键词	ORGANIC-MATTER ; TEMPERATURE SENSITIVITY ; NITROGEN AVAILABILITY ; SEMIARID ECOSYSTEMS ; EXTRACTION METHOD ; RESPIRATION ; DECOMPOSITION ; DYNAMICS ; MOISTURE ; DROUGHT
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/375806
作者单位	[Waring, Bonnie G.; Smith, Kenneth R.] Utah State Univ, Dept Biol, Logan, UT 84322 USA; [Waring, Bonnie G.; Smith, Kenneth R.] Utah State Univ, Ctr Ecol, Logan, UT 84322 USA; [Waring, Bonnie G.] Imperial Coll London, Grantham Inst Climate Change & Environm, London, England; [Grote, Edmund E.; Howell, Armin; Reibold, Robin; Tucker, Colin L.; Reed, Sasha C.] US Geol Survey, Southwest Biol Sci Ctr, Moab, UT USA; [Tucker, Colin L.] US Forest Serv, USDA, Northern Res Stn, Houghton, MI USA
推荐引用方式 GB/T 7714	Waring, Bonnie G.,Smith, Kenneth R.,Grote, Edmund E.,et al. Climatic Controls on Soil Carbon Accumulation and Loss in a Dryland Ecosystems[J],2021,126(12).
APA	Waring, Bonnie G..,Smith, Kenneth R..,Grote, Edmund E..,Howell, Armin.,Reibold, Robin.,...&Reed, Sasha C..(2021).Climatic Controls on Soil Carbon Accumulation and Loss in a Dryland Ecosystems.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,126(12).
MLA	Waring, Bonnie G.,et al."Climatic Controls on Soil Carbon Accumulation and Loss in a Dryland Ecosystems".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 126.12(2021).