气候变化领域集成服务门户(CCPortal): Fate and stability of dissolved organic carbon in topsoils and subsoils under beech forests

CCPortal

DOI	10.1007/s10533-020-00649-8
	Fate and stability of dissolved organic carbon in topsoils and subsoils under beech forests
	Kalks F.; Liebmann P.; Wordell-Dietrich P.; Guggenberger G.; Kalbitz K.; Mikutta R.; Helfrich M.; Don A.
发表日期	2020
ISSN	0168-2563
起始页码	111
结束页码	128
卷号	148 期号:2
英文摘要	Dissolved organic carbon (DOC) from Oa horizons has been proposed to be an important contributor for subsoil organic carbon stocks. We investigated the fate of DOC by directly injecting a DOC solution from 13C labelled litter into three soil depths at beech forest sites. Fate of injected DOC was quantified with deep drilling soil cores down to 2 m depth, 3 and 17 months after the injection. 27 ± 26% of the injected DOC was retained after 3 months and 17 ± 22% after 17 months. Retained DOC was to 70% found in the first 10 cm below the injection depth and on average higher in the topsoil than in the subsoil. After 17 months DOC in the topsoil was largely lost (− 19%) while DOC in the subsoil did not change much (− 4.4%). Data indicated a high stabilisation of injected DOC in the subsoils with no differences between the sites. Potential mineralisation as revealed by incubation experiments however, was not different between DOC injected in topsoil or subsoils underlining the importance of environmental factors in the subsoil for DOC stabilisation compared to topsoil. We conclude that stability of DOC in subsoil is primary driven by its spatial inaccessibility for microorganisms after matrix flow while site specific properties did not significantly affect stabilisation. Instead, a more fine-textured site promotes the vertical transport of DOC due to a higher abundance of preferential flow paths. © 2020, The Author(s).
英文关键词	13C; Cascade model; Field experiment; Forest subsoils; Incubation experiment
语种	英语
scopus关键词	carbon sequestration; deciduous forest; deep drilling; dissolved organic carbon; environmental factor; forest soil; soil carbon; soil depth; soil horizon; spatial analysis; subsoil; topsoil; Fagus
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/153162
作者单位	Thünen Institute of Climate-Smart Agriculture, Bundesallee 65, Braunschweig, 38116, Germany; Institute of Soil Science, Leibniz University Hannover, Herrenhäuser Str. 2, Hannover, 30419, Germany; Institute of Soil Science and Site Ecology, Technische Universität Dresden, Pienner Straße 19, Tharandt, 01737, Germany; Faculty of Natural Sciences III, Martin-Luther-University Halle-Wittenberg, Von-Seckendorff-Platz 3, Halle, 06120, Germany
推荐引用方式 GB/T 7714	Kalks F.,Liebmann P.,Wordell-Dietrich P.,et al. Fate and stability of dissolved organic carbon in topsoils and subsoils under beech forests[J],2020,148(2).
APA	Kalks F..,Liebmann P..,Wordell-Dietrich P..,Guggenberger G..,Kalbitz K..,...&Don A..(2020).Fate and stability of dissolved organic carbon in topsoils and subsoils under beech forests.Biogeochemistry,148(2).
MLA	Kalks F.,et al."Fate and stability of dissolved organic carbon in topsoils and subsoils under beech forests".Biogeochemistry 148.2(2020).