Decreases in soil moisture and organic matter quality suppress microbial decomposition following a boreal forest fire

被引:53
作者
Holden, Sandra R. [1 ]
Berhe, Asmeret Asefaw [2 ]
Treseder, Kathleen K. [1 ]
机构
[1] Univ Calif Irvine, Dept Ecol & Evolutionary Biol, Irvine, CA 92697 USA
[2] Univ Calif, Sch Nat Sci, Merced, CA 95343 USA
基金
美国国家科学基金会;
关键词
Boreal forest; Decomposition; Forest fire; Microbial respiration; Reciprocal transplant; Soil microbial community; LEAF-LITTER DECOMPOSITION; CLIMATE-CHANGE; TERRESTRIAL ECOSYSTEMS; ENZYME-ACTIVITIES; INTERIOR ALASKA; UNBALANCED DATA; CARBON; BIOMASS; FUNGAL; PRODUCTIVITY;
D O I
10.1016/j.soilbio.2015.04.005
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Climate warming is projected to increase the frequency and severity of wildfires in boreal forests, and increased wildfire activity may alter the large soil carbon (C) stocks in boreal forests. Changes in boreal soil C stocks that result from increased wildfire activity will be regulated in part by the response of microbial decomposition to fire, but post-fire changes in microbial decomposition are poorly understood. Here, we investigate the response of microbial decomposition to a boreal forest fire in interior Alaska and test the mechanisms that control post-fire changes in microbial decomposition. We used a reciprocal transplant between a recently burned boreal forest stand and a late successional boreal forest stand to test how post-fire changes in abiotic conditions, soil organic matter (SOM) composition, and soil microbial communities influence microbial decomposition. We found that SOM decomposing at the burned site lost 30.9% less mass over two years than SOM decomposing at the unburned site, indicating that post-fire changes in abiotic conditions suppress microbial decomposition. Our results suggest that moisture availability is one abiotic factor that constrains microbial decomposition in recently burned forests. In addition, we observed that burned SOM decomposed more slowly than unburned SOM, but the exact nature of SOM changes in the recently burned stand are unclear. Finally, we found no evidence that post-fire changes in soil microbial community composition significantly affect decomposition. Taken together, our study has demonstrated that boreal forest fires can suppress microbial decomposition due to post-fire changes in abiotic factors and the composition of SOM. Models that predict the consequences of increased wildfires for C storage in boreal forests may increase their predictive power by incorporating the observed negative response of microbial decomposition to boreal wildfires. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1 / 9
页数:9
相关论文
共 69 条
[2]   Warming and drying suppress microbial activity and carbon cycling in boreal forest soils [J].
Allison, Steven D. ;
Treseder, Kathleen K. .
GLOBAL CHANGE BIOLOGY, 2008, 14 (12) :2898-2909
[3]   Microbial abundance and composition influence litter decomposition response to environmental change [J].
Allison, Steven D. ;
Lu, Ying ;
Weihe, Claudia ;
Goulden, Michael L. ;
Martiny, Adam C. ;
Treseder, Kathleen K. ;
Martiny, Jennifer B. H. .
ECOLOGY, 2013, 94 (03) :714-725
[4]   Climate change feedbacks to microbial decomposition in boreal soils [J].
Allison, Steven D. ;
Treseder, Kathleen K. .
FUNGAL ECOLOGY, 2011, 4 (06) :362-374
[5]   PHYSIOLOGICAL METHOD FOR QUANTITATIVE MEASUREMENT OF MICROBIAL BIOMASS IN SOILS [J].
ANDERSON, JPE ;
DOMSCH, KH .
SOIL BIOLOGY & BIOCHEMISTRY, 1978, 10 (03) :215-221
[6]   Home-field advantage accelerates leaf litter decomposition in forests [J].
Ayres, Edward ;
Steltzer, Heidi ;
Simmons, Breana L. ;
Simpson, Rodney T. ;
Steinweg, J. Megan ;
Wallenstein, Matthew D. ;
Mellor, Nate ;
Parton, William J. ;
Moore, John C. ;
Wall, Diana H. .
SOIL BIOLOGY & BIOCHEMISTRY, 2009, 41 (03) :606-610
[7]   Assessing the extent of decomposition of natural organic materials using solid-state C-13 NMR spectroscopy [J].
Baldock, JA ;
Oades, JM ;
Nelson, PN ;
Skene, TM ;
Golchin, A ;
Clarke, P .
AUSTRALIAN JOURNAL OF SOIL RESEARCH, 1997, 35 (05) :1061-1083
[8]  
BALDOCK JA, 1992, BIOGEOCHEMISTRY, V16, P1, DOI 10.1007/BF02402261
[9]   Cycling and composition of organic matter in terrestrial and marine ecosystems [J].
Baldock, JA ;
Masiello, CA ;
Gélinas, Y ;
Hedges, JI .
MARINE CHEMISTRY, 2004, 92 (1-4) :39-64
[10]  
Balldock J., 2011, Handbook of Soil Sciences, P1