气候变化领域集成服务门户(CCPortal): Soil-atmosphere exchange of carbonyl sulfide in a Mediterranean citrus orchard

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DOI	10.5194/acp-19-3873-2019
	Soil-atmosphere exchange of carbonyl sulfide in a Mediterranean citrus orchard
	Yang F.; Qubaja R.; Tatarinov F.; Stern R.; Yakir D.
发表日期	2019
ISSN	16807316
起始页码	3873
结束页码	3883
卷号	19 期号:6
英文摘要	Carbonyl sulfide (COS) is used as a tracer of CO2 exchange at the ecosystem and larger scales. The robustness of this approach depends on knowledge of the soil contribution to the ecosystem fluxes, which is uncertain at present. We assessed the spatial and temporal variations in soil COS and CO2 fluxes in a Mediterranean citrus orchard combining surface flux chambers and soil concentration gradients. The spatial heterogeneity in soil COS exchange indicated net uptake below and between trees of up to 4.6pmolm-2s-1 and net emission in sun-exposed soil between rows of up to 2.6pmolm-2s-1, with an overall mean uptake value of 1.1±0.1pmolm-2s-1. Soil COS concentrations decreased with soil depth from atmospheric levels of ∼450 to ∼100ppt at 20cm depth, while CO2 concentrations increased from ∼400 to ∼5000ppm. COS flux estimates from the soil concentration gradients were, on average,-1:0 ± 0:3 pmol m-2 s-1, consistent with the chamber measurements. A soil COS flux algorithm driven by soil moisture and temperature (5 cm depth) and distance from the nearest tree, could explain 75 % of variance in soil COS flux. Soil relative uptake, the normalized ratio of COS to CO2 fluxes was, on average,-0:4 ± 0:3 and showed a general exponential response to soil temperature. The results indicated that soil COS fluxes at our study site were dominated by uptake, with relatively small net fluxes compared to both soil respiration and reported canopy COS fluxes. Such a result should facilitate the application of COS as a powerful tracer of ecosystem CO2 exchange. © 2019 Author(s).
语种	英语
scopus关键词	atmosphere-biosphere interaction; atmospheric chemistry; carbon flux; carbonyl compound; concentration (composition); orchard; soil depth; spatiotemporal analysis; sulfide; surface flux; Citrus
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144545
作者单位	Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, 76100, Israel; College of Animal Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
推荐引用方式 GB/T 7714	Yang F.,Qubaja R.,Tatarinov F.,et al. Soil-atmosphere exchange of carbonyl sulfide in a Mediterranean citrus orchard[J],2019,19(6).
APA	Yang F.,Qubaja R.,Tatarinov F.,Stern R.,&Yakir D..(2019).Soil-atmosphere exchange of carbonyl sulfide in a Mediterranean citrus orchard.Atmospheric Chemistry and Physics,19(6).
MLA	Yang F.,et al."Soil-atmosphere exchange of carbonyl sulfide in a Mediterranean citrus orchard".Atmospheric Chemistry and Physics 19.6(2019).