Universität zu Köln

Komarova, Alexandra, Ivashchenko, Kristina ORCID: 0000-0001-8397-158X, Sushko, Sofia, Zhuravleva, Anna, Vasenev, Vyacheslav and Blagodatsky, Sergey ORCID: 0000-0003-1428-6014 (2022). Temperature Sensitivity of Topsoil Organic Matter Decomposition Does Not Depend on Vegetation Types in Mountains. Plants-Basel, 11 (20). BASEL: MDPI. ISSN 2223-7747

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Abstract

Rising air temperatures caused by global warming affects microbial decomposition rate of soil organic matter (SOM). The temperature sensitivity of SOM decomposition (Q(10)) may depend on SOM quality determined by vegetation type. In this study, we selected a long transect (3.6 km) across the five ecosystems and short transects (0.1 km) from grazed and ungrazed meadows to forests in the Northwest Caucasus to consider different patterns in Q(10) changes at shift of the vegetation belts. It is hypothesized that Q(10) will increase along altitudinal gradient in line with recalcitrance of SOM according to kinetics-based theory. The indicators of SOM quality (BR:C, respiration per unit of soil C; MBC:C, ratio of microbial biomass carbon to soil carbon; soil C:N ratio) were used for checking the hypothesis. It was shown that Q(10) did not differ across vegetation types within long and short transects, regardless differences in projective cover (14-99%) and vegetation species richness (6-12 units per plot). However, Q(10) value differed between the long and short transects by almost two times (on average 2.4 vs. 1.4). Such a difference was explained by environmental characteristics linked with terrain position (slope steepness, microclimate, and land forms). The Q(10) changes across studied slopes were driven by BR:C for meadows (R-2 = 0.64; negative relationship) and pH value for forests (R-2 = 0.80; positive relationship). Thus, proxy of SOM quality explained Q(10) variability only across mountain meadows, whereas for forests, soil acidity was the main driver of microbial activity.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Komarova, Alexandra UNSPECIFIED UNSPECIFIED UNSPECIFIED Ivashchenko, Kristina UNSPECIFIED orcid.org/0000-0001-8397-158X UNSPECIFIED Sushko, Sofia UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhuravleva, Anna UNSPECIFIED UNSPECIFIED UNSPECIFIED Vasenev, Vyacheslav UNSPECIFIED UNSPECIFIED UNSPECIFIED Blagodatsky, Sergey UNSPECIFIED orcid.org/0000-0003-1428-6014 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-685223
DOI:	10.3390/plants11202765
Journal or Publication Title:	Plants-Basel
Volume:	11
Number:	20
Date:	2022
Publisher:	MDPI
Place of Publication:	BASEL
ISSN:	2223-7747
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SOIL RESPIRATION; CARBON DECOMPOSITION; FOREST ECOSYSTEMS; GRASSLAND SOILS; WUYI MOUNTAINS; GRADIENT; MINERALIZATION; FEEDBACKS; ALTITUDE; STOCKS Multiple languages Plant Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68522