Universität zu Köln

Meier, Ina C., Tueckmantel, Timo, Heitkoetter, Julian, Mueller, Karolin, Preusser, Sebastian, Wrobel, Thomas J., Kandeler, Ellen ORCID: 0000-0002-2854-0012, Marschner, Bernd and Leuschner, Christoph (2020). Root exudation of mature beech forests across a nutrient availability gradient: the role of root morphology and fungal activity. New Phytol., 226 (2). S. 583 - 595. HOBOKEN: WILEY. ISSN 1469-8137

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Abstract

Root exudation is a key plant function with a large influence on soil organic matter dynamics and plant-soil feedbacks in forest ecosystems. Yet despite its importance, the main ecological drivers of root exudation in mature forest trees remain to be identified. During two growing seasons, we analyzed the dependence of in situ collected root exudates on root morphology, soil chemistry and nutrient availability in six mature European beech (Fagus sylvatica L.) forests on a broad range of bedrock types. Root morphology was a major driver of root exudation across the nutrient availability gradient. A doubling of specific root length exponentially increased exudation rates of mature trees by c. 5-fold. Root exudation was also closely negatively related to soil pH and nitrogen (N) availability. At acidic and N-poor sites, where fungal biomass was reduced, exudation rates were c. 3-fold higher than at N- and base-richer sites and correlated negatively with the activity of enzymes degrading less bioavailable carbon (C) and N in the bulk soil. We conclude that root exudation increases on highly acidic, N-poor soils, in which fungal activity is reduced and a greater portion of the assimilated plant C is shifted to the external ecosystem C cycle.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Meier, Ina C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tueckmantel, Timo UNSPECIFIED UNSPECIFIED UNSPECIFIED Heitkoetter, Julian UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, Karolin UNSPECIFIED UNSPECIFIED UNSPECIFIED Preusser, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Wrobel, Thomas J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kandeler, Ellen UNSPECIFIED orcid.org/0000-0002-2854-0012 UNSPECIFIED Marschner, Bernd UNSPECIFIED UNSPECIFIED UNSPECIFIED Leuschner, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-348205
DOI:	10.1111/nph.16389
Journal or Publication Title:	New Phytol.
Volume:	226
Number:	2
Page Range:	S. 583 - 595
Date:	2020
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1469-8137
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SOIL MICROBIAL BIOMASS; NITROGEN UPTAKE; MYCORRHIZAL COLONIZATION; CHANGING ENVIRONMENT; EXTRACTION METHOD; PHOSPHORUS UPTAKE; ORGANIC-COMPOUNDS; TEMPERATE FOREST; BACTERIAL-GROWTH; ENZYME-ACTIVITY Multiple languages Plant Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/34820