DOI: 10.1111/gcb.14575
Scopus记录号: 2-s2.0-85061991892
论文题名: Drought and its legacy modulate the post-fire recovery of soil functionality and microbial community structure in a Mediterranean shrubland
作者: Hinojosa M.B. ; Laudicina V.A. ; Parra A. ; Albert-Belda E. ; Moreno J.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2019
卷: 25, 期: 4 起始页码: 1409
结束页码: 1427
语种: 英语
英文关键词: climate change
; enzyme activity
; fire
; microbial community
; rainfall manipulation
; resilience
; soil nutrients
Scopus关键词: Cistus
; Erica
; Fungi
; Posibacteria
英文摘要: The effects of drought on soil dynamics after fire are poorly known, particularly its long-term (i.e., years) legacy effects once rainfall returns to normal. Understanding this is particularly important for nutrient-poor soils in semi-arid regions affected by fire, in which rainfall is projected to decrease with climate change. Here, we studied the effects of post-fire drought and its legacy on soil microbial community structure and functionality in a Cistus-Erica shrubland (Spain). Rainfall total and patterns were experimentally modified to produce an unburned control (natural rainfall) and four burned treatments: control (natural rainfall), historical control (long-term average rainfall), moderate drought (percentile 8 historical rainfall, 5 months of drought per year), and severe drought (percentile 2, 7 months of drought). Soil nutrients and microbial community composition (ester-linked fatty acid approach) and functionality (enzyme activities and C mineralization rate) were monitored during the first 4 years after fire under rainfall treatments, plus two additional ones without them (six post-fire years). We found that the recovery of burned soils was lower under drought. Post-fire drought increased nitrate in the short term and reduced available phosphorus, exchangeable potassium, soil organic matter, enzyme activities, and carbon mineralization rate. Moreover, drought decreased soil total microbial biomass and fungi, with bacteria becoming relatively more abundant. Two years after discontinuing the drought treatments, the drought legacy was significant for available phosphorus and enzyme activities. Although microbial biomass did not show any drought legacy effect, the proportion of fungi and bacteria (mainly gram-positive) did, being lower and higher, respectively, in former drought-treated plots. We show that drought has an important impact on soil processes, and that some of its effects persist for at least 2 years after the drought ended. Therefore, drought and its legacy effects can be important for modeling biogeochemical processes in burned soils under future climate change. © 2019 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117452
Appears in Collections: 气候变化与战略
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Recommended Citation:
Hinojosa M.B.,Laudicina V.A.,Parra A.,et al. Drought and its legacy modulate the post-fire recovery of soil functionality and microbial community structure in a Mediterranean shrubland[J]. Global Change Biology,2019-01-01,25(4)