气候变化领域集成服务门户(CCPortal): Dissolved organic carbon production and flux under long-term litter manipulations in a Pacific Northwest old-growth forest

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DOI	10.1007/s10533-020-00667-6
	Dissolved organic carbon production and flux under long-term litter manipulations in a Pacific Northwest old-growth forest
	Evans L.R.; Pierson D.; Lajtha K.
发表日期	2020
ISSN	0168-2563
起始页码	75
结束页码	86
卷号	149 期号:1
英文摘要	Dissolved organic carbon (DOC) flux is an important mechanism to convey soil carbon (C) from aboveground organic debris (litter) to deeper soil horizons and can influence the formation of stable soil organic C compounds. The magnitude of this flux depends on both infiltration and DOC production rates which are functions of the climatic, soil, topographic and ecological characteristics of a region. Aboveground litter quantity and quality was manipulated for 20 years in an old-growth Douglas fir forest under six treatments to study relationships among litter inputs, DOC production and flux, and soil C dynamics. DOC concentrations were measured at two depths using tension lysimeters, and a hydrologic model was created to quantify water and DOC flux through the soil profile. DOC concentrations ranged from 3.0–8.0 and 1.5–2.5 mg C/L among treatments at 30 and 100 cm below the soil surface, respectively. Aboveground detrital inputs did not have a consistent positive effect on soil solution DOC; the addition of coarse woody debris increased soil solution DOC by 58% 30 cm belowground, while doubling the mass of aboveground leaf litter decreased DOC concentrations by 30%. We suggest that high-quality leaf litter accelerated microbial processing, resulting in a “priming” effect that led to the lower concentrations. Annual DOC flux into groundwater was small (2.7–3.7 g C/m2/year) and accounts for < 0.1% of estimated litter C at the site. Therefore, direct DOC loss from surface litter to groundwater is relatively negligible to the soil C budget. However, DOC flux into the soil surface was much greater (73–210 g C/m2/year), equivalent to 1.4–2.4% of aboveground litter C. Therefore, DOC transport is an important source of C to shallow soil horizons. © 2020, Springer Nature Switzerland AG.
英文关键词	DIRT; Dissolved organic carbon; DOC; H.J. Andrews Forest; LTER
语种	英语
scopus关键词	carbon flux; coarse woody debris; dissolved organic carbon; hydrological modeling; infiltration; leaf litter; old-growth forest; shallow soil; soil carbon; soil organic matter; soil profile; Pacific Northwest; Pseudotsuga; Pseudotsuga menziesii
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153147
作者单位	Department of Crop and Soil Sciences, Oregon State University, Corvallis, OR 97331, United States
推荐引用方式 GB/T 7714	Evans L.R.,Pierson D.,Lajtha K.. Dissolved organic carbon production and flux under long-term litter manipulations in a Pacific Northwest old-growth forest[J],2020,149(1).
APA	Evans L.R.,Pierson D.,&Lajtha K..(2020).Dissolved organic carbon production and flux under long-term litter manipulations in a Pacific Northwest old-growth forest.Biogeochemistry,149(1).
MLA	Evans L.R.,et al."Dissolved organic carbon production and flux under long-term litter manipulations in a Pacific Northwest old-growth forest".Biogeochemistry 149.1(2020).