DOI: 10.1111/gcb.14121
Scopus记录号: 2-s2.0-85045223567
论文题名: Disturbance from traditional fire management in subalpine heathlands increases Afro-alpine plant resilience to climate change
作者: Johansson M.U. ; Frisk C.A. ; Nemomissa S. ; Hylander K.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 7 起始页码: 2952
结束页码: 2964
语种: 英语
英文关键词: biodiversity
; competition
; cultural landscapes
; pastoral fire
; plant community assembly
; range margin
; REDD+
; warm-edge distribution limits
Scopus关键词: biodiversity
; climate change
; competition (ecology)
; cultural landscape
; deforestation
; ecosystem resilience
; fire management
; plant community
; subalpine environment
; Erica
; Tracheophyta
英文摘要: Species are often controlled by biotic factors such as competition at the warm edge of their distribution range. Disturbances at the treeline, disrupting competitive dominance, may thus enable alpine species to utilize lower altitudes. We searched for evidence for range expansion in grazed, fire-managed Ethiopian subalpine Erica heathlands across a 25-year chronosequence. We examined vascular plant composition in 48 plots (5 × 5 m) across an altitudinal range of 3,465–3,711 m.a.s.l. and analyzed how community composition changed in relation to increasing competition over time (using a Shade index based on Erica shrub height and cover) and altitude. Species‘ habitats and altitudinal ranges were derived from literature. Time since fire explained more variation (r2 =.41) in species composition than altitude did (r2 =.32) in an NMDS analysis. Community-weighted altitudinal optima for species in a plot decreased strongly with increasing shade (GLM, Standardized Regression Coefficient SRC = −.41, p =.003), but increased only weakly with altitude (SRC =.26, p =.054). In other words, young stands were dominated by species with higher altitudinal optima than old stands. Forest species richness increased with Log Shade index (SRC =.12, p =.008), but was unaffected by altitude (SRC = −.07, p =.13). However, richness of alpine and heathland species was not highest in plots with lowest Shade index, but displayed a unimodal pattern with an initial increase, followed by a decrease when shading increased (altitude was not significant). Our results indicate that disturbance from the traditional patch burning increases the available habitat for less competitive high-altitude plants and prevents tree line ascent. Therefore, maintaining, but regulating, the traditional land use increases the Afro-alpine flora's resilience to global warming. However, this system is threatened by a new REDD+ program attempting to increase carbon storage via fire suppression. This study highlights the importance of understanding traditional management regimes for biodiversity conservation in cultural landscapes in an era of global change. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110345
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Department of Plant Biology and Biodiversity Management, Addis Ababa University, Addis Ababa, Ethiopia; National Pollen and Aerobiological Research Unit, Institute of Science and the Environments, University of Worcester, Worcester, United Kingdom
Recommended Citation:
Johansson M.U.,Frisk C.A.,Nemomissa S.,et al. Disturbance from traditional fire management in subalpine heathlands increases Afro-alpine plant resilience to climate change[J]. Global Change Biology,2018-01-01,24(7)