Immediate and carry-over effects of increased soil frost on soil respiration and microbial activity in a spruce forest
Yang, Kaijun (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Peng, Changhui (Université de Montréal. Département de sciences biologiques)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Kardol, Paul (Swedish University of Agricultural Science. Department of Forest Ecology and Management)
Li, Zhijie (Sichuan Agricultural University. Institute of Ecology and Forest)
Zhang, Li (Sichuan Agricultural University. Institute of Ecology and Forest)
Ni, Xiangyin (Sichuan Agricultural University. Institute of Ecology and Forest)
Yue, Kai (Sichuan Agricultural University. Institute of Ecology and Forest)
Tan, Bo (Sichuan Agricultural University. Institute of Ecology and Forest)
Yin, Rui (Helmholtz Centre for Environmental Research)
Xu, Zhenfeng (Sichuan Agricultural University. Institute of Ecology and Forest)

Date:	2019
Abstract:	Increased soil frost associated with winter climate change could have immediate and carry-over effects on biological processes in high-altitude forest soils, but the nature of these processes remain poorly understood. We conducted a snow-exclusion experiment to investigate the immediate and cross-seasonal effects of increased soil frost on soil CO₂ efflux and biological activity in a subalpine spruce forest on the eastern Tibetan Plateau, China. The increased frost reduced soil CO₂ efflux by ∼15 and ∼19% in the winters of 2015/2016 and 2016/2017, respectively. Increased frost also tended to decrease soil basal respiration, the amount of microbial phospholipid fatty acids and the activities of enzymes involved in soil carbon cycling during the winters. Winter soil nitrogen availabilities were higher in the snow-exclusion treatment than in the control plots. However, these effects did not carry over to the following growing season. Our results suggest that increased frost reduces winter soil respiration by direct environmental effects (e. g. soil temperature) and indirect biological processes (e. g. microbial biomass and activity), whereas increased frost did not induce any cross-seasonal effects. These findings underscore the ecological importance of seasonal snowpack and microbe-associated carbon processes in subalpine forests where winter snowfall is decreasing substantially.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Snow exclusion ; Soil enzyme ; Microbial biomass ; Nitrogen availability ; Soil aggregate ; Fine root
Published in:	Soil biology and biochemistry, Vol. 135 (Aug. 2019) , p. 51-59, ISSN 0038-0717

DOI: 10.1016/j.soilbio.2019.04.012

Postprint 39 p, 1.3 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Research articles
Articles > Published articles