干旱区生态环境知识资源中心(Arid): Response of Kalahari vegetation to seasonal climate and herbivory: Results of 15 years of vegetation monitoring

Arid

DOI	10.1111/jvs.12927
	Response of Kalahari vegetation to seasonal climate and herbivory: Results of 15 years of vegetation monitoring
	Schmiedel, Ute; Jacke, Vasco; Hachfeld, Berit; Oldeland, Jens
通讯作者	Schmiedel, U
来源期刊	JOURNAL OF VEGETATION SCIENCE
ISSN	1100-9233
EISSN	1654-1103
英文摘要	Questions The arid Kalahari is prone to desertification as a result of climate change and/or land use. We analysed the effects of climatic variables and game herbivory on the vegetation composition to answer the question of how different life-form types respond to climate, browsers and grazers as drivers of vegetation change. Location The study was situated in the arid savanna of the South African Kalahari. Methods Vegetation monitoring was conducted on 20 randomly selected permanent plots (100 m(2)) within a biodiversity observatory. For each plot, individuals per species (abundance) were counted annually and grouped into eight life-form types (annual and perennial graminoid and annual and perennial forb, geophyte, dwarf shrub, large shrub and tree). We ran generalised linear mixed models (GLMM) with abundance per life-form type as response variable and a seasonal drought index (Standardised Precipitation-Evapotranspiration Index [SPEI]), total annual rainfall, year, density of large game and springbok as fixed effects, plot as random effect and year as random slope. Results Seasonal SPEI and density of large game and springbok had the strongest effect on abundance per life-form type. Annual rainfall did not show any effect. The grazing large game had positive effects on the abundance of herbaceous life forms and dwarf shrubs. The predominantly browsing springbok had negative effects on perennial forbs, dwarf shrubs and trees. Directional trends in abundance per life form over time (increase of annual and decrease of perennial graminoids and forbs, increase of large shrubs) and decrease of total annual cover suggest early stages of vegetation degradation and shrub encroachment in response to both herbivory and climate. Conclusions Our study showed that studies aimed at understanding the dynamics of arid systems should include both variance of intra-annual climatic conditions and herbivore density as environmental drivers, related to abundance per life-form/strategy type to reveal their specific responses to the environment.
英文关键词	abundance values browsing and grazing herbivory counts of plant individuals game density glmmTMB in-situ monitoring Kalahari rangeland savanna southern Africa Standardised Precipitation-Evapotranspiration Index vegetation dynamics
类型	Article ; Early Access
语种	英语
开放获取类型	Other Gold
收录类别	SCI-E
WOS记录号	WOS:000569447800001
WOS关键词	LONG-TERM RESPONSE ; SEMIARID SAVANNA ; LAND-USE ; RAINFALL VARIABILITY ; GRAZING PRESSURE ; SUCCULENT KAROO ; DYNAMICS ; RANGELAND ; STABILITY ; DROUGHT
WOS类目	Plant Sciences ; Ecology ; Forestry
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology ; Forestry
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/328249
作者单位	[Schmiedel, Ute; Jacke, Vasco; Hachfeld, Berit; Oldeland, Jens] Univ Hamburg, Inst Plant Sci & Microbiol, Hamburg, Germany; [Hachfeld, Berit] Univ Hamburg, Ctr Earth Syst Res & Sustainabil CEN, Hamburg, Germany
推荐引用方式 GB/T 7714	Schmiedel, Ute,Jacke, Vasco,Hachfeld, Berit,et al. Response of Kalahari vegetation to seasonal climate and herbivory: Results of 15 years of vegetation monitoring[J].
APA	Schmiedel, Ute,Jacke, Vasco,Hachfeld, Berit,&Oldeland, Jens.
MLA	Schmiedel, Ute,et al."Response of Kalahari vegetation to seasonal climate and herbivory: Results of 15 years of vegetation monitoring".JOURNAL OF VEGETATION SCIENCE