Arid
DOI10.2989/10220119.2014.914974
A century of woody plant encroachment in the dry Kimberley savanna of South Africa
Ward, David1; Hoffman, M. Timm2; Collocott, Sarah J.1
通讯作者Ward, David
来源期刊AFRICAN JOURNAL OF RANGE & FORAGE SCIENCE
ISSN1022-0119
EISSN1727-9380
出版年2014
卷号31期号:2页码:107-121
英文摘要

Woody plant encroachment is frequent in dry savannas. Grazing is often considered to be a major cause of encroachment in dry savannas because grasses are removed by livestock, leaving bare areas for trees to colonise in wetter years. Earlier experiments conducted in the Kimberley area of the Northern Cape showed that neither fire nor grazing was important for woody plant encroachment. We used aerial and fixed-point repeat ground photographs, including historical photographs taken at the time of the Second Anglo-Boer War of 1899-1902, to assess the scale and timing of woody plant encroachment in the dry savannas near Kimberley in South Africa (mean annual rainfall = 300-400 mm). There were large increases in woody plant encroachment in most areas. Even at the battlefield of Magersfontein, where grazing has been virtually absent since its protection in 1960, we found that encroachment by trees and shrubs has occurred. Using aerial photographs, we found that the rate of encroachment has increased substantially since 1993. However, repeated photographs at certain sites indicate that encroachment produced cohorts of trees. We show that global drivers are perhaps of greater importance than local drivers such as heavy grazing and absence of fire.


英文关键词aerial photography fixed-point photographs global climate change semi-arid shrub encroachment
类型Article
语种英语
国家South Africa
收录类别SCI-E
WOS记录号WOS:000339043600003
WOS关键词SHRUB ENCROACHMENT ; ELEVATED CO2 ; LAND-USE ; AERIAL-PHOTOGRAPHY ; BUSH ENCROACHMENT ; ATMOSPHERIC CO2 ; TEXTURAL ANALYSIS ; WATER RELATIONS ; CARBON-DIOXIDE ; ARID SAVANNA
WOS类目Ecology ; Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/180473
作者单位1.Univ KwaZulu Natal, Sch Life Sci, Pietermaritzburg, South Africa;
2.Univ Cape Town, Dept Bot, Plant Conservat Unit, ZA-7925 Cape Town, South Africa
推荐引用方式
GB/T 7714
Ward, David,Hoffman, M. Timm,Collocott, Sarah J.. A century of woody plant encroachment in the dry Kimberley savanna of South Africa[J],2014,31(2):107-121.
APA Ward, David,Hoffman, M. Timm,&Collocott, Sarah J..(2014).A century of woody plant encroachment in the dry Kimberley savanna of South Africa.AFRICAN JOURNAL OF RANGE & FORAGE SCIENCE,31(2),107-121.
MLA Ward, David,et al."A century of woody plant encroachment in the dry Kimberley savanna of South Africa".AFRICAN JOURNAL OF RANGE & FORAGE SCIENCE 31.2(2014):107-121.
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