干旱区生态环境知识资源中心(Arid): The Obscuring Effects of Calcite Dissolution and Formation on Quantifying Soil Respiration

Arid

DOI	10.1029/2020GB006584
	The Obscuring Effects of Calcite Dissolution and Formation on Quantifying Soil Respiration
	Gallagher, Timothy M.; Breecker, Daniel O.
通讯作者	Gallagher, TM (corresponding author), Univ Texas Austin, Dept Geol Sci, Austin, TX 78712 USA. ; Gallagher, TM (corresponding author), Kent State Univ, Dept Geol, Kent, OH 44242 USA.
来源期刊	GLOBAL BIOGEOCHEMICAL CYCLES
ISSN	0886-6236
EISSN	1944-9224
出版年	2020
卷号	34 期号:12
英文摘要	Drylands occupy nearly 40% of the land surface and comprise a globally significant carbon reservoir. Dryland-atmosphere carbon exchange may regulate interannual variability in atmospheric CO2. Quantifying soil respiration rates in these environments is often complicated by the presence of calcium carbonates, which are a common feature of dryland soils. We show with high-precision O-2 measurements in a laboratory potted soil experiment that respiration rates after watering were similar in control and carbonate treatment soils. However, CO2 concentrations were up to 72% lower in the carbonate treatment soil because CO2 was initially consumed during calcite dissolution. Subsequently, CO2 concentrations were over 166% greater in the carbonate treatment soil as respiration slowed and calcite precipitated, releasing CO2. Elevated delta C-13 values of soil CO2 (>6 parts per thousand higher in the treatment than control) confirm that observed differences were due to calcite dissolution. These findings demonstrate that calcite dissolution and precipitation can occur rapidly enough to affect soil gas compositions and that changes in soil CO2 are not always directly related to changes in soil respiration rates. Studies of local soil respiration rates and carbon exchange are likely to be influenced by dissolution and precipitation of calcium carbonates in soils. We estimate that one fifth of global soil respiration occurs in soils that contain some amount of soil carbonate, underscoring the need to account for its obscuring effects when trying to quantify soil respiration and net ecosystem exchange on a regional or global scale.
英文关键词	soil carbonate apparent respiratory quotient dryland pulsed precipitation carbon isotope
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000603665500004
WOS关键词	STABLE ISOTOPIC COMPOSITION ; PRECIPITATION PULSES ; MOJAVE-DESERT ; INTERANNUAL VARIABILITY ; SEMIARID ECOSYSTEMS ; CO2 FLUX ; CARBON ; SEQUESTRATION ; TEMPERATURE ; VEGETATION
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348884
作者单位	[Gallagher, Timothy M.; Breecker, Daniel O.] Univ Texas Austin, Dept Geol Sci, Austin, TX 78712 USA; [Gallagher, Timothy M.] Kent State Univ, Dept Geol, Kent, OH 44242 USA
推荐引用方式 GB/T 7714	Gallagher, Timothy M.,Breecker, Daniel O.. The Obscuring Effects of Calcite Dissolution and Formation on Quantifying Soil Respiration[J],2020,34(12).
APA	Gallagher, Timothy M.,&Breecker, Daniel O..(2020).The Obscuring Effects of Calcite Dissolution and Formation on Quantifying Soil Respiration.GLOBAL BIOGEOCHEMICAL CYCLES,34(12).
MLA	Gallagher, Timothy M.,et al."The Obscuring Effects of Calcite Dissolution and Formation on Quantifying Soil Respiration".GLOBAL BIOGEOCHEMICAL CYCLES 34.12(2020).