Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.14455 |
Fire severity effects on soil carbon and nutrients and microbial processes in a Siberian larch forest | |
Ludwig, Sarah M.1; Alexander, Heather D.2; Kielland, Knut3; Mann, Paul J.4; Natali, Susan M.1; Ruess, Roger W.3 | |
2018-12-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2018 |
卷号 | 24期号:12页码:5841-5852 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England |
英文摘要 | Fire frequency and severity are increasing in tundra and boreal regions as climate warms, which can directly affect climate feedbacks by increasing carbon (C) emissions from combustion of the large soil C pool and indirectly via changes in vegetation, permafrost thaw, hydrology, and nutrient availability. To better understand the direct and indirect effects of changing fire regimes in northern ecosystems, we examined how differences in soil burn severity (i.e., extent of soil organic matter combustion) affect soil C, nitrogen (N), and phosphorus (P) availability and microbial processes over time. We created experimental burns of three fire severities (low, moderate, and high) in a larch forest in the northeastern Siberian Arctic and analyzed soils at 1, 8 days, and 1 year postfire. Labile dissolved C and N increased with increasing soil burn severity immediately (1 day) postfire by up to an order of magnitude, but declined significantly 1 week later; both variables were comparable or lower than unburned soils by 1 year postfire. Soil burn severity had no effect on P in the organic layer, but P increased with increasing severity in mineral soil horizons. Most extracellular enzyme activities decreased by up to 70% with increasing soil burn severity. Increasing soil burn severity reduced soil respiration 1 year postfire by 50%. However, increasing soil burn severity increased net N mineralization rates 1 year postfire, which were 10-fold higher in the highest burn severity. While fires of high severity consumed approximately five times more soil C than those of low severity, soil C pools will also be driven by indirect effects of fire on soil processes. Our data suggest that despite an initial increase in labile C and nutrients with soil burn severity, soil respiration and extracellular activities related to the turnover of organic matter were greatly reduced, which may mitigate future C losses following fire. |
英文关键词 | arctic boreal forest carbon cycling climate change extracellular enzyme activity fire permafrost |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000449650600020 |
WOS关键词 | DISSOLVED ORGANIC-MATTER ; CLIMATE-CHANGE ; PERMAFROST DEGRADATION ; BOREAL FOREST ; LITTER DECOMPOSITION ; NORTHEASTERN SIBERIA ; PRESCRIBED FIRE ; BURN SEVERITY ; ACTIVE LAYER ; NITROGEN |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/16667 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Woods Hole Res Ctr, Falmouth, MA 02540 USA; 2.Mississippi State Univ, Forest & Wildlife Res Ctr, Dept Forestry, Starkville, MS USA; 3.Univ Alaska Fairbanks, Inst Arctic Biol, Fairbanks, AK USA; 4.Northumbria Univ, Dept Geog & Environm Sci, Newcastle Upon Tyne, Tyne & Wear, England |
推荐引用方式 GB/T 7714 | Ludwig, Sarah M.,Alexander, Heather D.,Kielland, Knut,et al. Fire severity effects on soil carbon and nutrients and microbial processes in a Siberian larch forest[J]. GLOBAL CHANGE BIOLOGY,2018,24(12):5841-5852. |
APA | Ludwig, Sarah M.,Alexander, Heather D.,Kielland, Knut,Mann, Paul J.,Natali, Susan M.,&Ruess, Roger W..(2018).Fire severity effects on soil carbon and nutrients and microbial processes in a Siberian larch forest.GLOBAL CHANGE BIOLOGY,24(12),5841-5852. |
MLA | Ludwig, Sarah M.,et al."Fire severity effects on soil carbon and nutrients and microbial processes in a Siberian larch forest".GLOBAL CHANGE BIOLOGY 24.12(2018):5841-5852. |
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