干旱区生态环境知识资源中心(Arid): Dryland irrigation increases accumulation rates of pedogenic carbonate and releases soil abiotic CO2

Arid

DOI	10.1038/s41598-021-04226-3
	Dryland irrigation increases accumulation rates of pedogenic carbonate and releases soil abiotic CO2
	Ortiz, Anna C.; Jin, Lixin; Ogrinc, Nives; Kaye, Jason; Krajnc, Bor; Ma, Lin
通讯作者	Jin, LX (corresponding author)，Univ Texas El Paso, Dept Geol Sci, 500 W Univ Ave, El Paso, TX 79968 USA.
来源期刊	SCIENTIFIC REPORTS
ISSN	2045-2322
出版年	2022
卷号	12 期号:1
英文摘要	Agricultural fields in drylands are challenged globally by limited freshwater resources for irrigation and also by elevated soil salinity and sodicity. It is well known that pedogenic carbonate is less soluble than evaporate salts and commonly forms in natural drylands. However, few studies have evaluated how irrigation loads dissolved calcium and bicarbonate to agricultural fields, accelerating formation rates of secondary calcite and simultaneously releasing abiotic CO2 to the atmosphere. This study reports one of the first geochemical and isotopic studies of such anthropogenic pedogenic carbonates and CO2 from irrigated drylands of southwestern United States. A pecan orchard and an alfalfa field, where flood-irrigation using the Rio Grande river is a common practice, were compared to a nearby natural dryland site. Strontium and carbon isotope ratios show that bulk pedogenic carbonates in irrigated soils at the pecan orchard primarily formed due to flood-irrigation, and that approximately 20-50% of soil CO2 in these irrigated soils is calcite-derived abiotic CO2 instead of soil-respired or atmospheric origins. Multiple variables that control the salt buildup in this region are identified and impact the crop production and soil sustainability regionally and globally. Irrigation intensity and water chemistry (irrigation water quantity and quality) dictate salt loading, and soil texture governs water infiltration and salt leaching. In the study area, agricultural soils have accumulated up to 10 wt% of calcite after just about 100 years of cultivation. These rates will likely increase in the future due to the combined effects of climate variability (reduced rainfall and more intense evaporation), use of more brackish groundwater for irrigation, and reduced porosity in soils. The enhanced accumulation rates of pedogenic carbonate are accompanied by release of large amounts of abiotic CO2 from irrigated drylands to atmosphere. Extensive field studies and modelling approaches are needed to further quantify these effluxes at local, regional and global scales.
类型	Article
语种	英语
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000741645800011
WOS关键词	MOJAVE DESERT ; ISOTOPIC COMPOSITION ; CLIMATE-CHANGE ; ARID SOILS ; SEQUESTRATION ; GROWTH ; CHEMISTRY ; EVOLUTION ; EMISSIONS ; STRONTIUM
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376581
作者单位	[Ortiz, Anna C.; Jin, Lixin; Ma, Lin] Univ Texas El Paso, Dept Geol Sci, 500 W Univ Ave, El Paso, TX 79968 USA; [Ogrinc, Nives; Krajnc, Bor] Jozef Stefan Inst, Dept Environm Sci, Ljubljana, Slovenia; [Kaye, Jason] Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA
推荐引用方式 GB/T 7714	Ortiz, Anna C.,Jin, Lixin,Ogrinc, Nives,et al. Dryland irrigation increases accumulation rates of pedogenic carbonate and releases soil abiotic CO2[J],2022,12(1).
APA	Ortiz, Anna C.,Jin, Lixin,Ogrinc, Nives,Kaye, Jason,Krajnc, Bor,&Ma, Lin.(2022).Dryland irrigation increases accumulation rates of pedogenic carbonate and releases soil abiotic CO2.SCIENTIFIC REPORTS,12(1).
MLA	Ortiz, Anna C.,et al."Dryland irrigation increases accumulation rates of pedogenic carbonate and releases soil abiotic CO2".SCIENTIFIC REPORTS 12.1(2022).