DOI: 10.1016/j.foreco.2015.06.036
Scopus记录号: 2-s2.0-84945462118
论文题名: Caught in a human disturbance trap: Responses of tropical savanna trees to increasing land-use pressure
作者: Ouédraogo O. ; Bondé L. ; Boussim J.I. ; Linstädter A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 354 起始页码: 68
结束页码: 76
语种: 英语
英文关键词: Burkina Faso
; Regeneration
; Size-class distribution
; Sudanian savannas
; Tree populations
; Vulnerability
Scopus关键词: Biometrics
; Forestry
; Land use
; Population statistics
; Reforestation
; Burkina Faso
; Regeneration
; Size class
; Sudanian savannas
; Tree population
; Vulnerability
; Population distribution
; allometry
; environmental disturbance
; human activity
; juvenile
; land use
; land use change
; phytomass
; regeneration
; savanna
; tropical environment
; vulnerability
; Burkina Faso
英文摘要: Increasing land-use pressure threatens the persistence of tree populations in West Africa's savannas. We do not fully understand yet why tree species respond differently to human disturbances, hampering the design of appropriate management strategies. To identify typical response pathways, we compared tree populations in three land-use types with increasing levels of human disturbance (protected forest, fallow and field). We analyzed size-class distributions (SCDs) of species and plant functional types, and compared the performance of juvenile and adult age-classes. Biomass was derived from biometric measurements via allometric equations. Higher land-use pressure increased juvenile proportions of plant functional types, but divergent responses were found for species: Juvenile proportions on fields were either very low (0%) or, in most cases, very high (>96%), leading to SCDs with significant negative slopes. While negative slopes are commonly interpreted as indicating populations with sufficient recruitment, they could also indicate growth suppression, particularly if size-classes are missing between juveniles and adults. This 'juveniles get trapped' pathway is well-recognized for near-natural savannas with a high incidence of fire ('fire trap') or wild browsers ('browse trap'), and is attributed to a high resprouting ability of trees. As resprouting constitutes a pre-adaptation to human disturbances, the trap concept should be extended accordingly. Species dominating in highly disturbed environments are either characterized by trait combinations allowing them to persist in a 'human disturbance trap', or they are actively protected. Our results advocate for designing management strategies that take into account how species' age-classes respond to disturbances. As the escape of juveniles to mature vegetation is a main demographic bottleneck for most Sudanian savanna species, it is essential to create escape opportunities. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65335
Appears in Collections: 影响、适应和脆弱性
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作者单位: University of Ouagadougou, Laboratory of Plant Biology and Ecology, Ouagadougou 03, Burkina Faso; University of Cologne, Botanical Institute, Range Ecology and Range Management Group, Zülpicher Str. 47b, Cologne, Germany
Recommended Citation:
Ouédraogo O.,Bondé L.,Boussim J.I.,et al. Caught in a human disturbance trap: Responses of tropical savanna trees to increasing land-use pressure[J]. Forest Ecology and Management,2015-01-01,354