干旱区生态环境知识资源中心(Arid): Agricultural acceleration of soil carbonate weathering

Arid

DOI	10.1111/gcb.15207
	Agricultural acceleration of soil carbonate weathering
	Kim, John H.; Jobbagy, Esteban G.; Richter, Daniel D.; Trumbore, Susan E.; Jackson, Robert B.
通讯作者	Kim, JH
来源期刊	GLOBAL CHANGE BIOLOGY
ISSN	1354-1013
EISSN	1365-2486
出版年	2020
卷号	26 期号:10 页码:5988-6002
英文摘要	Soil carbonates (i.e., soil inorganic carbon or SIC) represent more than a quarter of the terrestrial carbon pool and are often considered to be relatively stable, with fluxes significant only on geologic timescales. However, given the importance of climatic water balance on SIC accumulation, we tested the hypothesis that increased soil water storage and transport resulting from cultivation may enhance dissolution of SIC, altering their local stock at decadal timescales. We compared SIC storage to 7.3 m depth in eight sites, each having paired plots of native vegetation and rain-fed croplands, and half the sites having additional irrigated cropland plots. Rain-fed and irrigated croplands had 328 and 730 Mg C/ha less SIC storage, respectively, compared to their native vegetation (grassland or woodland) pairs, and irrigated croplands had 402 Mg C/ha less than their rain-fed pairs (p < .0001). SIC contents were negatively correlated with estimated groundwater recharge, suggesting that dissolution and leaching may be responsible for SIC losses observed. Under croplands, the remaining SIC had more modern radiocarbon and a delta C-13 composition that was closer to crop inputs than under native vegetation, suggesting that cultivation has led to faster turnover and incorporation of recent crop carbon into the SIC pool (p < .0001). The losses occurred just 30-100 years after land-use changes, indicating SIC stocks that were stable for millennia can rapidly adjust to increased soil water flows. Large SIC losses (194-242 Mg C/ha) also occurred below 4.9 m deep under irrigated croplands, with SIC losses lagging behind the downward-advancing wetting front by similar to 30 years, suggesting that even deep SIC were affected. These observations suggest that the vertical distribution of SIC in dry ecosystems is dynamic on decadal timescales, highlighting its potential role as a carbon sink or source to be examined in the context of land use and climate change.
英文关键词	C-14 carbon sequestration climate engineering crop cultivation deep drainage dryland precipitation gradient soil inorganic carbon stock
类型	Article
语种	英语
开放获取类型	Green Published, Other Gold
收录类别	SCI-E
WOS记录号	WOS:000552290100001
WOS关键词	DISSOLVED INORGANIC CARBON ; LAND-USE ; SAMPLE PREPARATION ; WATER-MOVEMENT ; SEQUESTRATION ; DESERT ; CO2 ; ACIDIFICATION ; DISSOLUTION ; CULTIVATION
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325203
作者单位	[Kim, John H.; Trumbore, Susan E.] Max Planck Inst Biogeochem, Hans Knoll Str 10, D-07745 Jena, Germany; [Jobbagy, Esteban G.] Univ Nacl San Luis, IMASL, Grp Estudios Ambientales, CONICET, San Luis, Argentina; [Richter, Daniel D.] Duke Univ, Nicholas Sch Environm, Durham, NC 27708 USA; [Jackson, Robert B.] Stanford Univ, Sch Earth Energy & Environm Sci, Stanford, CA 94305 USA
推荐引用方式 GB/T 7714	Kim, John H.,Jobbagy, Esteban G.,Richter, Daniel D.,et al. Agricultural acceleration of soil carbonate weathering[J],2020,26(10):5988-6002.
APA	Kim, John H.,Jobbagy, Esteban G.,Richter, Daniel D.,Trumbore, Susan E.,&Jackson, Robert B..(2020).Agricultural acceleration of soil carbonate weathering.GLOBAL CHANGE BIOLOGY,26(10),5988-6002.
MLA	Kim, John H.,et al."Agricultural acceleration of soil carbonate weathering".GLOBAL CHANGE BIOLOGY 26.10(2020):5988-6002.