globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-014-0022-y
Scopus ID: 2-s2.0-84911368529
Different effects of warming and cooling on the decomposition of soil organic matter in warm–temperate oak forests: a reciprocal translocation experiment
Author: Luan J.; Liu S.; Chang S.X.; Wang J.; Zhu X.; Liu K.; Wu J.
Source Publication: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
Publishing Year: 2014
Volume: 121, Issue:3
pages begin: 551
pages end: 564
Language: 英语
Keyword: Climate warming ; CO2 flux ; Microbial metabolic quotient ; Q10 ; Simulated cooling ; Soil organic carbon decomposition
Scopus Keyword: climate change ; decomposition ; dicotyledon ; microbial activity ; soil carbon ; soil organic matter ; temperate forest ; temperature effect ; Baotianman Nature Reserve ; China ; Henan
English Abstract: A reciprocal soil monolith-transfer experiment was conducted along an altitude gradient to investigate the effect of climate change on soil carbon (C) processes in two warm–temperate oak forests in Baotianman Nature Reserve, Henan Province, China. Microclimate conditions, soil surface CO2 flux, and labile organic C were measured for in-situ and transferred soils at both high and low-elevation sites. The soil temperature at 5 cm depth was, on average, 3.27 °C warmer at the low-elevation site than at the high-elevation site. Net CO2 flux (911 g C m−2 13 months−1, 4.7 % of total C) of soil monoliths transferred from the high to the low-elevation site (simulating warming) was substantially (44 %) greater than for high-elevation soil monoliths incubated in situ (633 g C m−2 13 months−1, 3.3 % of total C) during 13 months of incubation. Increased extractable organic C (K2SO4-C) supply with warming partly explained the increase of soil CO2 flux. Simulated warming also significantly increased the temperature sensitivity (Q10 values) of soil organic matter decomposition. The positive linear relationship between microbial metabolic quotient (qCO2) and Q10 suggests a connection between microbial population and Q10 under warming conditions. Transfer of soil monoliths from the low to the high-elevation site (simulating cooling) substantially (30 %) reduced soil CO2 flux (383 g C m−2 13 months−1, 2.5 % of total C) compared with those incubated in situ (550 g C m−2 13 months−1, 3.5 % of total C). However, this was not accompanied by consistently opposite changes, to a similar extent, in labile organic C (microbial biomass carbon and K2SO4-C) and decomposition results (i.e., Q10 and R10, soil respiration at 10 °C), indicating that the soil organic matter decomposition process may not respond equally to cooling and warming. Different soil organic matter decomposition responses to cooling and warming should be considered for paleoecological modeling when both warming and cooling are involved in the changes in regional and global climates, particularly during the Holocene. © 2014, The Author(s).
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Document Type: 期刊论文
Appears in Collections:气候减缓与适应

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Affiliation: The Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Key Laboratory of Forest Ecology and Environment, China’s State Forestry Administration, Beijing, China; Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada; Division of Forestry and Natural Resources, West Virginia University, Morgantown, WV, United States; Baotianman Natural Reserve Administration, Neixiang, Henan, China; Institute for Clinical Evaluative Sciences, ELL-108, 800 Commissioners Road, London, ON, Canada; Sustainable Resource management, Grenfell Campus, Memorial University of Newfoundland, Corner Brook, NL, Canada

Recommended Citation:
Luan J.,Liu S.,Chang S.X.,et al. Different effects of warming and cooling on the decomposition of soil organic matter in warm–temperate oak forests: a reciprocal translocation experiment[J]. Biogeochemistry,2014-01-01,121(3)
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