Spacing patterns of an Acacia tree in the Kalahari over a 61-year period: How clumped becomes regular and vice versa. Moustakas, A., Wiegand, K., Getzin, S., Ward, D., Meyer, K. M., Guenther, M., & Mueller, K. H. Acta Oecologica, 33(3):355–364, 2008.
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Pdf doi abstract bibtex Nearest tree neighbour distances and the tree spatial formation on a large scale over time and space replicates were examined. The study was conducted in a natural savanna ecosystem in the Southern Kalahari, South Africa. Nearest tree neighbour and point pattern analysis methods were used to investigate changes in the spatial pattern of trees in two plots. Trees larger than 2 m canopy diameter were mapped. We used aerial photographs of the study area from 1940, 1964, 1984, 1993, and a satellite image from 2001 to follow two plots over time. Field work was carried out too for classification accuracy. We were able to identify and individually follow over 2400 individual trees from 1940 until 2001. Nearest neighbour analysis results indicate that dead trees were on average closer to their nearest neighbouring trees than living trees were to their neighbours. Most dead trees were on average 6 m from their nearest neighbours, while most living trees were about 20 m apart. Point pattern analysis results show a cyclical transition from clumped to random and sequentially to regular tree spacing. These transitions were not correlated across two plots. Generally, decreases in small-scale clumping coincided with periods of high mortality. Our findings show that regular, clumped, and random tree pattern can occur, pending on time, location, and scale within the location. © 2008 Elsevier Masson SAS. All rights reserved.
@Article{Moustakas2008,
author = {Moustakas, Aristides and Wiegand, Kerstin and Getzin, Stephan and Ward, David and Meyer, Katrin M. and Guenther, Matthias and Mueller, Karl Heinz},
title = {{Spacing patterns of an Acacia tree in the Kalahari over a 61-year period: How clumped becomes regular and vice versa}},
journal = {Acta Oecologica},
year = {2008},
volume = {33},
number = {3},
pages = {355--364},
issn = {1146609X},
url_pdf = {http://uni-goettingen.de/de/document/download/9024bb91a09195582b52c334ef55a1d2.PDF/Moustakas_et_al_(2008)_ACTA_OECOL_Spacing_patterns_Acacia%20tree.PDF},
abstract = {Nearest tree neighbour distances and the tree spatial formation on a large scale over time and space replicates were examined. The study was conducted in a natural savanna ecosystem in the Southern Kalahari, South Africa. Nearest tree neighbour and point pattern analysis methods were used to investigate changes in the spatial pattern of trees in two plots. Trees larger than 2 m canopy diameter were mapped. We used aerial photographs of the study area from 1940, 1964, 1984, 1993, and a satellite image from 2001 to follow two plots over time. Field work was carried out too for classification accuracy. We were able to identify and individually follow over 2400 individual trees from 1940 until 2001. Nearest neighbour analysis results indicate that dead trees were on average closer to their nearest neighbouring trees than living trees were to their neighbours. Most dead trees were on average 6 m from their nearest neighbours, while most living trees were about 20 m apart. Point pattern analysis results show a cyclical transition from clumped to random and sequentially to regular tree spacing. These transitions were not correlated across two plots. Generally, decreases in small-scale clumping coincided with periods of high mortality. Our findings show that regular, clumped, and random tree pattern can occur, pending on time, location, and scale within the location. {\textcopyright} 2008 Elsevier Masson SAS. All rights reserved.},
comment = {public},
doi = {10.1016/j.actao.2008.01.008},
isbn = {1146-609X},
keywords = {Acacia erioloba,Long-term study,Nearest neighbour analysis,Point pattern analysis,Savanna,Spatial patterns,Tree mortality,Tree size,Tree-tree competition},
}Downloads: 0
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