Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.foreco.2017.11.056 |
Population structure and spatial point-pattern analysis of a mono stand of Acacia polyacantha along a catena in a savanna ecosystem | |
Muvengwi, Justice1,2; Mbiba, Monicah1,2; Chikumbindi, Joyline2; Ndagurwa, Hilton G. T.1,3,4; Mureva, Admore2 | |
2018-02-01 | |
发表期刊 | FOREST ECOLOGY AND MANAGEMENT
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ISSN | 0378-1127 |
EISSN | 1872-7042 |
出版年 | 2018 |
卷号 | 409页码:499-508 |
文章类型 | Article |
语种 | 英语 |
国家 | South Africa; Zimbabwe |
英文摘要 | Soil catenas represent a major environmental gradient that shape vegetation structure (e.g. as reflected in changes in the distribution of tree height, basal diameter and crown diameter) and spatial patterns in savanna landscapes. However, determining the mechanisms behind vegetation patterns remains challenging since distinct processes like species interactions and environmental factors can promote the formation of similar patterns. Here, we combine quantitative analyses of vegetation structure and tree morphology with spatial point pattern analysis to understand the impact of catena gradients in a savanna ecosystem. We focused on changes in the density, structure and spatial pattern of Acacia poiyaccuitha along a catena gradient. We sampled three 50 m x 50 m plots in the upper, middle and bottom sections of the catena. The cartesian coordinates of all the trees in the plots were recorded using the ruler method. Variables such as height, canopy cover and basal diameter for each tree were measured. Tree height, basal area and canopy cover were compared across the slope using one-way analysis of variance. Spatial point-pattern of the trees was explored using lxith Ripley's K-function and the pair-correlation function. Intraspecific interactions were also inferred from nearest-neighbour analysis. Trees were of highest basal area, height and canopy cover in the bottom section of the catena compared with both middle and upper sections. As expected, trees showed some regular distribution in the bottom section of the catena at scales between 8 and 10 m which is similar to the mean nearest neighbour distance. Contrary to the expected clustered distribution in the upper section of the catena, regular distribution was noted between 1 and 5 m and 9 and 11 m. The fact that trees were larger for all measured variables in the bottom section of the catena than in the middle or upper, support the findings of other studies where eluviation and illuviation resulted in nutrient rich soils at bottom of catena that support high plant growth. We conclude that both topography and negative density dependent play an important role in shaping the structure and spatial point-pattern of A. polyacantha. |
英文关键词 | Acacia polyacantha Catena Ripley' s K fraction Spatial analysis Pair correlation function |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425578000050 |
WOS关键词 | SIZE-CLASS DISTRIBUTIONS ; AFRICAN SAVANNA ; RAIN-FOREST ; LANDSCAPE PATTERN ; SOUTHERN AFRICA ; TERMITE MOUNDS ; TREE COMMUNITY ; COMPETITION ; TOPOGRAPHY ; INFORMATION |
WOS类目 | Forestry |
WOS研究方向 | Forestry |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/23703 |
专题 | 气候变化 |
作者单位 | 1.Univ Witwatersrand, Sch Anim Plant & Environm Sci, Private Bag 3, ZA-2050 Johannesburg, South Africa; 2.Bindura Univ Sci Educ, Dept Nat Resources, Bindura 1020, Zimbabwe; 3.Natl Univ Sci & Technol, Fac Sci Appl, Dept Forest Resources & Wildlife Management, POB AC 939 Ascot, Bulawayo, Zimbabwe; 4.Natl Univ Sci & Technol, Fac Sci Appl, Forest Ecol Lab, POB AC 939 Ascot, Bulawayo, Zimbabwe |
推荐引用方式 GB/T 7714 | Muvengwi, Justice,Mbiba, Monicah,Chikumbindi, Joyline,et al. Population structure and spatial point-pattern analysis of a mono stand of Acacia polyacantha along a catena in a savanna ecosystem[J]. FOREST ECOLOGY AND MANAGEMENT,2018,409:499-508. |
APA | Muvengwi, Justice,Mbiba, Monicah,Chikumbindi, Joyline,Ndagurwa, Hilton G. T.,&Mureva, Admore.(2018).Population structure and spatial point-pattern analysis of a mono stand of Acacia polyacantha along a catena in a savanna ecosystem.FOREST ECOLOGY AND MANAGEMENT,409,499-508. |
MLA | Muvengwi, Justice,et al."Population structure and spatial point-pattern analysis of a mono stand of Acacia polyacantha along a catena in a savanna ecosystem".FOREST ECOLOGY AND MANAGEMENT 409(2018):499-508. |
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