Arid
DOI10.1016/j.sajb.2008.12.001
The impact of browsing-induced degradation on the reproduction of subtropical thicket canopy shrubs and trees
Sigwela, A. M.2; Kerley, G. I. H.2; Mills, A. J.3; Cowling, R. M.1
通讯作者Cowling, R. M.
来源期刊SOUTH AFRICAN JOURNAL OF BOTANY
ISSN0254-6299
EISSN1727-9321
出版年2009
卷号75期号:2页码:262-267
英文摘要

The regeneration dynamics of South African subtropical thicket are poorly understood. This lack of knowledge hampers the development of appropriate restoration protocols in degraded landscapes. To address this we compared the magnitude of seed production and the frequency seedlings of canopy species in intact and browsing-degraded forms of Portulacaria afra-dominated thicket. Severe browsing had a negative impact on sexual reproduction of canopy species. Seed production for all species was lower in the degraded than the intact states of both vegetation types. In the case of seedlings, almost all individuals were associated with beneath-canopy microsites, irrespective of degradation status. Exceptions were P. afra, Putterlickia pyracantha and Grewia robusta. Of the 511 seedlings that we observed, 480 (94%) were found in the beneath-canopy microsite and 31 (6%) in the open. In both intact and degraded sites, there were significantly fewer seedlings (all species combined) in open microsites than would be expected on the basis of the aerial extent of this microsite. The results show firstly that preservation of remnant clumps of closed-canopy thicket in degraded landscapes is of paramount importance for restoration, and that for recruitment of a wide range of canopy species to occur outside of these remnant clumps, it is essential to restore closed-canopy conditions as speedily as possible. (c) 2008 SAAB. Published by Elsevier B.V. All rights reserved.


英文关键词Carbon credits Portulacaria afra Restoration Seed production Seedling establishment Soil organic matter
类型Article
语种英语
国家South Africa
收录类别SCI-E
WOS记录号WOS:000265814000007
WOS关键词SEMIARID SUCCULENT THICKET ; SUNDAYS-RIVER-VALLEY ; SOUTH-AFRICA ; EASTERN CAPE ; SOIL RESOURCES ; DESERTIFICATION ; TRANSFORMATION ; VEGETATION ; PATTERNS ; ORIGIN
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/2XILL650/162635
作者单位1.Nelson Mandela Metropolitan Univ, Restorat Res Grp, Dept Bot, ZA-6031 Port Elizabeth, South Africa;
2.Nelson Mandela Metropolitan Univ, Dept Zool, Ctr African Conservat Ecol, ZA-6031 Port Elizabeth, South Africa;
3.Univ Stellenbosch, Dept Soil Sci, Restorat Res Grp, ZA-7602 Matieland, South Africa
推荐引用方式
GB/T 7714
Sigwela, A. M.,Kerley, G. I. H.,Mills, A. J.,et al. The impact of browsing-induced degradation on the reproduction of subtropical thicket canopy shrubs and trees[J],2009,75(2):262-267.
APA Sigwela, A. M.,Kerley, G. I. H.,Mills, A. J.,&Cowling, R. M..(2009).The impact of browsing-induced degradation on the reproduction of subtropical thicket canopy shrubs and trees.SOUTH AFRICAN JOURNAL OF BOTANY,75(2),262-267.
MLA Sigwela, A. M.,et al."The impact of browsing-induced degradation on the reproduction of subtropical thicket canopy shrubs and trees".SOUTH AFRICAN JOURNAL OF BOTANY 75.2(2009):262-267.
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