Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0254-6299 |
EISSN | 1727-9321 |
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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