干旱区生态环境知识资源中心(Arid): One savanna, many shapes: How bush control affects the woody layer in the southern Kalahari

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DOI	10.1016/j.sajb.2019.08.026
	One savanna, many shapes: How bush control affects the woody layer in the southern Kalahari
	Dreber, N.1,2; van Rooyen, S. E.2,3; Kellner, K.2
通讯作者	Dreber, N.
来源期刊	SOUTH AFRICAN JOURNAL OF BOTANY
ISSN	0254-6299
EISSN	1727-9321
出版年	2019
卷号	125 页码:511-520
英文摘要	Bush thickening (shrub encroachment) is a major ecological and economic threat in southern African savannas. Different types and intensities of bush control (BC) are applied to counteract and mitigate bush thickening. However, woody vegetation response to BC and possible ecological side effects can be manifold. Land users therefore require solid knowledge about the associated structural and compositional changes, helping to apply an informed BC strategy that preserves multiple ecosystem services and functions. The present study addresses this need in a South African thornbush-type savanna. We sampled 41 rangeland sites with a known history of BC in comparison to benchmark conditions. The BC treatments included a selective and non-selective arboricide application and a selective stem burning. We identified each woody species in belt transects and measured the size and canopy of all individuals. The data were used to calculate measures of diversity, cover and density and to describe the population structure of key species. Marked differences in woody species composition and abundance patterns as well as significant alterations of the horizontal and vertical woody vegetation structure clearly reflected the intensity and level of selectivity with which BC had been conducted. While population trends displayed regeneration of key species, important structural elements (large mature trees) were often at risk of being lost from the savanna ecosystem. Results suggest varying degrees of ecosystem functional integrity following the BC treatments. It is concluded that selective BC treatments should be preferred as they allow to create open and well-structured savannas in benefit of the stability and biodiversity of the system. Yet, for improved predictions further research is needed into species-specific population dynamics and trait-related plant-plant interactions. In addition, there is still uncertainty about possible long-term ecological effects associated with the use of arboricides in this type of savanna, which should receive special attention in future research. (C) 2019 SAAB. Published by Elsevier B.V. All rights reserved.
英文关键词	Arboricide Biodiversity Diversity profile Height-class distribution Savanna Shrub encroachment Species composition Sustainable land management Vegetation structure Woody vegetation
类型	Article
语种	英语
国家	Germany ; South Africa
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000488195200060
WOS关键词	SHRUB ENCROACHMENT ; POPULATION-STRUCTURE ; ECOSYSTEM SERVICES ; ARID SAVANNA ; SOIL CARBON ; LAND-USE ; AFRICAN ; VEGETATION ; NITROGEN ; DENSITY
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218912
作者单位	1.Univ Gottingen, Fac Forest Sci & Forest Ecol, Dept Ecosyst Modelling, Busgenweg 4, D-37077 Gottingen, Germany; 2.North West Univ, Unit Environm Sci & Management, Private Bag X6001, ZA-2520 Potchefstroom, South Africa; 3.Environm Management Grp, ZA-9300 Bloemfontein, South Africa
推荐引用方式 GB/T 7714	Dreber, N.,van Rooyen, S. E.,Kellner, K.. One savanna, many shapes: How bush control affects the woody layer in the southern Kalahari[J],2019,125:511-520.
APA	Dreber, N.,van Rooyen, S. E.,&Kellner, K..(2019).One savanna, many shapes: How bush control affects the woody layer in the southern Kalahari.SOUTH AFRICAN JOURNAL OF BOTANY,125,511-520.
MLA	Dreber, N.,et al."One savanna, many shapes: How bush control affects the woody layer in the southern Kalahari".SOUTH AFRICAN JOURNAL OF BOTANY 125(2019):511-520.