DOI: 10.1111/gcb.14861
论文题名: Altered ignition catchments threaten a hyperdiverse fire-dependent ecosystem
作者: Slingsby J.A. ; Moncrieff G.R. ; Rogers A.J. ; February E.C.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2020
卷: 26, 期: 2 语种: 英语
英文关键词: alternative stable states
; anthropogenic fire shadows
; Cape Floristic Region
; fire pools
; fire regimes
; fire shadows
; forest
; Fynbos
; hidden collapse
; native invasion
Scopus关键词: anthropogenic effect
; biodiversity
; biological invasion
; conceptual framework
; forested catchment
; fynbos
; land use change
; prescribed burning
; wildfire
; South Africa
; Table Mountain National Park
; Western Cape
英文摘要: Human activities affect fire in many ways, often unintentionally or with considerable time-lags before they manifest themselves. Anticipating these changes is critical, so that insidious impacts on ecosystems, their biodiversity and associated goods and services can be avoided, mitigated or managed. Here we explore the impact of anthropogenic land cover change on fire and biodiversity in adjacent ecosystems on the hyperdiverse Cape Peninsula, South Africa. We develop a conceptual framework based on the notion of an ignition catchment, or the spatial extent and temporal range where an ignition is likely to result in a site burning. We apply this concept using fire models to estimate spatial changes in burn probability between historical and current land cover. This change layer was used to predict the observed record of fires and forest encroachment into fire-dependent Fynbos ecosystems in Table Mountain National Park. Urban expansion has created anthropogenic fire shadows that are modifying fire return intervals, facilitating a state shift to low-diversity, non-flammable forest at the expense of hyperdiverse, flammable Fynbos ecosystems. Despite occurring in a conservation area, these ecosystems are undergoing a hidden collapse and desperately require management intervention. Anthropogenic fire shadows can be caused by many human activities and are likely to be a universal phenomenon, not only contributing to the observed global decline in fire activity but also causing extreme fires in ecosystems where there is no shift to a less flammable state and flammable fuels accumulate. The ignition catchment framework is highly flexible and allows detection or prediction of changes in the fire regime, the threat this poses for ecosystems or fire risk and areas where management interventions and/or monitoring are required. Identifying anthropogenic impacts on ignition catchments is key for both understanding global impacts of humans on fire and guiding management of human-altered landscapes for desirable outcomes. © 2019 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159682
Appears in Collections: 气候变化与战略
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作者单位: Fynbos Node, South African Environmental Observation Network (SAEON), Cape Town, South Africa; Centre for Statistics in Ecology, Environment and Conservation, Department of Biological Sciences, University of Cape Town, Rondebosch, South Africa; Department of Biological Sciences, University of Cape Town, Rondebosch, South Africa
Recommended Citation:
Slingsby J.A.,Moncrieff G.R.,Rogers A.J.,et al. Altered ignition catchments threaten a hyperdiverse fire-dependent ecosystem[J]. Global Change Biology,2020-01-01,26(2)