气候变化领域集成服务门户(CCPortal): Processes involving soil CO2 dynamic in a sector of Chaco-Pampean plain, Argentina: An isotope geochemical approach

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DOI	10.1007/s11631-024-00678-2
	Processes involving soil CO2 dynamic in a sector of Chaco-Pampean plain, Argentina: An isotope geochemical approach
	Romina, Sanci; Hector, Panarello
发表日期	2024
ISSN	2096-0956
EISSN	2365-7499
英文摘要	The magnitude and spatial variability of CO2 surface emissions and processes involving CO2 released to the atmosphere from the soils are relevant issues in the context of climate change. This work evaluated CO2 fluxes and C-13/C-12 ratio of vegetation, organic matter, and soil gases from no disturbed soils of Chaco Pampean Plain (Argentina) with different soil properties and environmental conditions (PL and PA units). Soil organic decomposition from individual layers was accompanied by delta C-13 of total organic carbon (delta C-13-TOC) values more enriched to depth. delta C-13-TOC values in the upper soil profile similar to ca. 0-15 cm were like the plant community of this area (similar to-33 to -29 parts per thousand) while delta C-13-TOC varied stronger bellow horizon A, till similar to -24 parts per thousand. Both delta C-13-TOC and soil delta C-13-CO2 were similar (similar to -24 to 26 parts per thousand) at deeper horizons (similar to 50-60 cm). Toward the superficial layers, delta C-13-TOC and delta C-13-CO2 showed more differences (till similar to 4 parts per thousand), due influence of the diffusion process. Horizon A layer (similar to 0-20 cm) from both PL and PA units contained the most enriched delta C-13-CO2 values (similar to -15-17 parts per thousand) because atmospheric CO2 permeated the soil air. A simple two-component mixing model between sources (atmospheric delta C-13-CO2 and soil CO2) confirmed that process. Isotopically, CO2 fluxes reflected the biodegradation of C3 plants (source), diffusive transport, and CO2 exchange (atmosphere/soil). Soil moisture content appeared as a determining factor in the diffusion process and the magnitude of CO2 surface emissions (12-60 g.m(-2).d(-1)). That condition was confirmed by CO2 diffusion coefficients estimated by air-filled porosity parameters and soil radon gradient model.
英文关键词	Soil CO2; Carbon isotopes; Isotope fractionation; Radon gases
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001181406600001
来源期刊	ACTA GEOCHIMICA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303888
作者单位	University of Buenos Aires; University of Buenos Aires
推荐引用方式 GB/T 7714	Romina, Sanci,Hector, Panarello. Processes involving soil CO2 dynamic in a sector of Chaco-Pampean plain, Argentina: An isotope geochemical approach[J],2024.
APA	Romina, Sanci,&Hector, Panarello.(2024).Processes involving soil CO2 dynamic in a sector of Chaco-Pampean plain, Argentina: An isotope geochemical approach.ACTA GEOCHIMICA.
MLA	Romina, Sanci,et al."Processes involving soil CO2 dynamic in a sector of Chaco-Pampean plain, Argentina: An isotope geochemical approach".ACTA GEOCHIMICA (2024).