DOI: 10.1111/gcb.12844
论文题名: Charcoal-inferred Holocene fire and vegetation history linked to drought periods in the Democratic Republic of Congo
作者: Hubau W. ; Van den Bulcke J. ; Van Acker J. ; Beeckman H.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 6 起始页码: 2296
结束页码: 2308
语种: 英语
英文关键词: Central Africa
; Charcoal analysis
; Fire
; Palaeobotany
; Palaeoenvironment
; Vegetation history
; Wood anatomy
Scopus关键词: charcoal
; drought
; fire history
; Holocene
; Medieval Warm Period
; paleobotany
; paleoclimate
; paleoenvironment
; vegetation history
; wood
; Democratic Republic Congo
; charcoal
; soil
; climate change
; Democratic Republic Congo
; drought
; ecosystem
; fire
; history
; radiometric dating
; rain forest
; soil
; tree
; Charcoal
; Climate Change
; Democratic Republic of the Congo
; Droughts
; Ecosystem
; Fires
; History, Ancient
; History, Medieval
; Radiometric Dating
; Rainforest
; Soil
; Trees
英文摘要: The impact of Holocene drought events on the presumably stable Central African rainforest remains largely unexplored, in particular the significance of fire. High-quality sedimentary archives are scarce, and palynological records mostly integrate over large regional scales subject to different fire regimes. Here, we demonstrate a direct temporal link between Holocene droughts, palaeofire and vegetation change within present-day Central African rainforest, using records of identified charcoal fragments extracted from soil in the southern Mayumbe forest (Democratic Republic of Congo). We find three distinct periods of local palaeofire occurrence: 7.8-6.8 ka BP, 2.3-1.5 ka BP, 0.8 ka BP - present. These periods are linked to well-known Holocene drought anomalies: the 8.2 ka BP event, the 3rd millennium BP rainforest crisis and the Mediaeval Climate Anomaly. During and after these Holocene droughts, the Central African rainforest landscape was characterized by a fragmented pattern with fire-prone open patches. Some fires occurred during the drought anomalies although most fires seem to lag behind them, which suggests that the open patches remained fire-prone after the actual climate anomalies. Charcoal identifications indicate that mature rainforest patches did persist through the Early to Mid-Holocene climatic transition, the subsequent Holocene thermal optimum and the third millennium BP rainforest crisis, until 0.8 ka BP. However, disturbance and fragmentation were probably more prominent near the boundary of the southern Mayumbe forest. Furthermore, the dominance of pioneer and woodland savanna taxa in younger charcoal assemblages indicates that rainforest regeneration was hampered by increasingly severe drought conditions after 0.8 ka BP. These results support the notion of a dynamic forest ecosystem at multicentury time scales across the Central African rainforest. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61858
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Forest and Water Management, Laboratory of Wood Technology, Ghent University, Coupure Links 653, Gent, Belgium; Royal Museum for Central Africa, Laboratory for Wood Biology, Leuvensesteenweg 13, Tervuren, Belgium
Recommended Citation:
Hubau W.,Van den Bulcke J.,Van Acker J.,et al. Charcoal-inferred Holocene fire and vegetation history linked to drought periods in the Democratic Republic of Congo[J]. Global Change Biology,2015-01-01,21(6)