Universität zu Köln

Angst, Gerrit ORCID: 0000-0003-4421-5444, Messinger, Johanna, Greiner, Maria, Haeusler, Werner, Hertel, Dietrich, Kirfel, Kristina, Koegel-Knabner, Ingrid, Leuschner, Christoph, Rethemeyer, Janet and Mueller, Carsten W. (2018). Soil organic carbon stocks in topsoil and subsoil controlled by parent material, carbon input in the rhizosphere, and microbial-derived compounds. Soil Biol. Biochem., 122. S. 19 - 31. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0038-0717

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Abstract

Despite a large body of studies investigating soil organic carbon (SOC) stocks and potential influencing factors, the impact of contrasting parent material, particularly in the subsoil, has received little attention. To reveal potential effects varying parent materials exert on SOC stocks, we investigated chemical (C-14 content and overall chemical composition via C-13 NMR spectroscopy) and plant/microbial related parameters (root mass, amino sugars) of bulk soil and soil organic matter fractions from topsoil, subsoil, and rhizosphere soil at three European beech stands (Fagus sylvatica L.) only differing in parent material (Tertiary sand, Quaternary loess, and Tertiary basalt). The results suggest that the clay fraction, its amount being largely dependent on the respective parent material, took a central role in shaping differences in SOC stocks among the investigated sites by affecting soil organic matter stabilization via organo-mineral association and aggregation. This fraction was particularly relevant in the subsoil, where it accounted for up to 80% of the bulk soil SOC stocks that decreased with decreasing amounts of the clay fraction (basalt > loess > sand site). Determining the soil's nutrient composition, parent material likely also indirectly affected SOC stocks by changing rhizosphere traits (such as fine root density or mortality) and by attracting root growth (and thus organic matter inputs) to subsoil with higher nutrient contents, where in situ root inputs in the form of rhizodeposits were likely the prime source of plant-derived SOC. However, root inputs also contributed in large part to topsoil SOC stocks and were associated with higher abundance of microbial compounds (amino sugars), whose relative importance increased with increasing soil depth. Independent of soil depth and site, amino sugars and the amount of the clay fraction, combined with parameters related to the input of organic matter (root mass and amount of the particulate organic matter fraction) explained more than 90% of the variability in SOC stocks, indicating a key role of these measures in impacting SOC stocks. Because parent material directly or indirectly influenced these parameters, we demonstrate the necessity to consider differences in parent material when estimating and predicting SOC stocks.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Angst, Gerrit UNSPECIFIED orcid.org/0000-0003-4421-5444 UNSPECIFIED Messinger, Johanna UNSPECIFIED UNSPECIFIED UNSPECIFIED Greiner, Maria UNSPECIFIED UNSPECIFIED UNSPECIFIED Haeusler, Werner UNSPECIFIED UNSPECIFIED UNSPECIFIED Hertel, Dietrich UNSPECIFIED UNSPECIFIED UNSPECIFIED Kirfel, Kristina UNSPECIFIED UNSPECIFIED UNSPECIFIED Koegel-Knabner, Ingrid UNSPECIFIED UNSPECIFIED UNSPECIFIED Leuschner, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED Rethemeyer, Janet UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, Carsten W. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-180727
DOI:	10.1016/j.soilbio.2018.03.026
Journal or Publication Title:	Soil Biol. Biochem.
Volume:	122
Page Range:	S. 19 - 31
Date:	2018
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	0038-0717
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STATE C-13 NMR; FINE-ROOT BIOMASS; CHEMICAL-COMPOSITION; FAGUS-SYLVATICA; MATTER STORAGE; PHYLLOSILICATE MINERALOGY; VERTICAL-DISTRIBUTION; LITTER DECOMPOSITION; TEMPERATE SOILS; BEECH FOREST Multiple languages Soil Science Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18072