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Spatial Analysis of the Woody Flora of the Djoumouna Peri-urban Forest, Brazzaville (Congo)

Received: 8 January 2019     Accepted: 27 February 2019     Published: 20 March 2019
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Abstract

The spatial analysis of the flora of the peri-urban forest of Djoumouna has been conducted in Brazzaville, Congo. Data collection, conducted from April to August 2017, is based on a floristic inventory of 75 plots of each 400 m2 (20 m x 20 m). The study shows 898 trees of dbh ≥ 10 cm corresponding to 106 species and 36 families. The number of individuals per plot averages 11.97 ± 0.42 feet/plot while the number of species per plot averages 7.37 ± 0.30. The land used by projecting the trunk sections is on average 0.74 ± 0.05 m2/plot. The Jaccard similarity coefficient between plots is between 0 and 75% while the average Skewness is 1.26 ± 0.11. The average Shannon index is 1.77 ± 0.05 per plot with an average maximum diversity of 1.93 ± 0.04. The average Pielou index is 0.91 ± 0.01. The absolute diversity index averages 6.54 ± 0.29 while α-Fisher averages 11.44 ± 1.39. The average value of the Green index is -0.04 ± 0.01 and finally 7.55% of taxa have a rarefaction index of species between 40 and 77% compared to 92.45% where this index varies from 81 to 99%. The upward hierarchical classification and the AFC highlight the presence of floristic subfacies resulting from taxa independence. Since most species have a density of less than 1 tree.ha-1, the floristic composition is heterogeneous, resulting in insufficient natural regeneration and low resilience of this ecosystem threatened with extinction in the very short term.

Published in Ecology and Evolutionary Biology (Volume 4, Issue 1)
DOI 10.11648/j.eeb.20190401.11
Page(s) 1-10
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

Congo, Peri-urban Forest, Plant Diversity, Bio-Ecological Diversity Indices, Structural Parameters

References
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    Victor Kimpouni, Jean de Dieu Nzila, Charmes-Maïdet Massamba-Makanda, Salisou Yallo Mouhamed, Jean-Pierre Kampe. (2019). Spatial Analysis of the Woody Flora of the Djoumouna Peri-urban Forest, Brazzaville (Congo). Ecology and Evolutionary Biology, 4(1), 1-10. https://doi.org/10.11648/j.eeb.20190401.11

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    Victor Kimpouni; Jean de Dieu Nzila; Charmes-Maïdet Massamba-Makanda; Salisou Yallo Mouhamed; Jean-Pierre Kampe. Spatial Analysis of the Woody Flora of the Djoumouna Peri-urban Forest, Brazzaville (Congo). Ecol. Evol. Biol. 2019, 4(1), 1-10. doi: 10.11648/j.eeb.20190401.11

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    Victor Kimpouni, Jean de Dieu Nzila, Charmes-Maïdet Massamba-Makanda, Salisou Yallo Mouhamed, Jean-Pierre Kampe. Spatial Analysis of the Woody Flora of the Djoumouna Peri-urban Forest, Brazzaville (Congo). Ecol Evol Biol. 2019;4(1):1-10. doi: 10.11648/j.eeb.20190401.11

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  • @article{10.11648/j.eeb.20190401.11,
      author = {Victor Kimpouni and Jean de Dieu Nzila and Charmes-Maïdet Massamba-Makanda and Salisou Yallo Mouhamed and Jean-Pierre Kampe},
      title = {Spatial Analysis of the Woody Flora of the Djoumouna Peri-urban Forest, Brazzaville (Congo)},
      journal = {Ecology and Evolutionary Biology},
      volume = {4},
      number = {1},
      pages = {1-10},
      doi = {10.11648/j.eeb.20190401.11},
      url = {https://doi.org/10.11648/j.eeb.20190401.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.eeb.20190401.11},
      abstract = {The spatial analysis of the flora of the peri-urban forest of Djoumouna has been conducted in Brazzaville, Congo. Data collection, conducted from April to August 2017, is based on a floristic inventory of 75 plots of each 400 m2 (20 m x 20 m). The study shows 898 trees of dbh ≥ 10 cm corresponding to 106 species and 36 families. The number of individuals per plot averages 11.97 ± 0.42 feet/plot while the number of species per plot averages 7.37 ± 0.30. The land used by projecting the trunk sections is on average 0.74 ± 0.05 m2/plot. The Jaccard similarity coefficient between plots is between 0 and 75% while the average Skewness is 1.26 ± 0.11. The average Shannon index is 1.77 ± 0.05 per plot with an average maximum diversity of 1.93 ± 0.04. The average Pielou index is 0.91 ± 0.01. The absolute diversity index averages 6.54 ± 0.29 while α-Fisher averages 11.44 ± 1.39. The average value of the Green index is -0.04 ± 0.01 and finally 7.55% of taxa have a rarefaction index of species between 40 and 77% compared to 92.45% where this index varies from 81 to 99%. The upward hierarchical classification and the AFC highlight the presence of floristic subfacies resulting from taxa independence. Since most species have a density of less than 1 tree.ha-1, the floristic composition is heterogeneous, resulting in insufficient natural regeneration and low resilience of this ecosystem threatened with extinction in the very short term.},
     year = {2019}
    }
    

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  • TY  - JOUR
    T1  - Spatial Analysis of the Woody Flora of the Djoumouna Peri-urban Forest, Brazzaville (Congo)
    AU  - Victor Kimpouni
    AU  - Jean de Dieu Nzila
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    AU  - Salisou Yallo Mouhamed
    AU  - Jean-Pierre Kampe
    Y1  - 2019/03/20
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    N1  - https://doi.org/10.11648/j.eeb.20190401.11
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    T2  - Ecology and Evolutionary Biology
    JF  - Ecology and Evolutionary Biology
    JO  - Ecology and Evolutionary Biology
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    EP  - 10
    PB  - Science Publishing Group
    SN  - 2575-3762
    UR  - https://doi.org/10.11648/j.eeb.20190401.11
    AB  - The spatial analysis of the flora of the peri-urban forest of Djoumouna has been conducted in Brazzaville, Congo. Data collection, conducted from April to August 2017, is based on a floristic inventory of 75 plots of each 400 m2 (20 m x 20 m). The study shows 898 trees of dbh ≥ 10 cm corresponding to 106 species and 36 families. The number of individuals per plot averages 11.97 ± 0.42 feet/plot while the number of species per plot averages 7.37 ± 0.30. The land used by projecting the trunk sections is on average 0.74 ± 0.05 m2/plot. The Jaccard similarity coefficient between plots is between 0 and 75% while the average Skewness is 1.26 ± 0.11. The average Shannon index is 1.77 ± 0.05 per plot with an average maximum diversity of 1.93 ± 0.04. The average Pielou index is 0.91 ± 0.01. The absolute diversity index averages 6.54 ± 0.29 while α-Fisher averages 11.44 ± 1.39. The average value of the Green index is -0.04 ± 0.01 and finally 7.55% of taxa have a rarefaction index of species between 40 and 77% compared to 92.45% where this index varies from 81 to 99%. The upward hierarchical classification and the AFC highlight the presence of floristic subfacies resulting from taxa independence. Since most species have a density of less than 1 tree.ha-1, the floristic composition is heterogeneous, resulting in insufficient natural regeneration and low resilience of this ecosystem threatened with extinction in the very short term.
    VL  - 4
    IS  - 1
    ER  - 

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Author Information
  • Higher Teacher Training College (ENS), Marien Ngouabi University, Brazzaville, Republic of Congo

  • Higher Teacher Training College (ENS), Marien Ngouabi University, Brazzaville, Republic of Congo

  • National Forestry Research Institute (IRF), Brazzaville, Republic of Congo

  • National Forestry Research Institute (IRF), Brazzaville, Republic of Congo

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