Thinning after selective logging facilitates floristic composition recovery in a tropical rain forest of Central Africa : Method, insights and perspectives
In the Congo Basin where most timber species are light-demanding, the low logging intensities commonly implemented (1-2 trees harvested ha?1) do not provide sufficient canopy gaps to ensure species regeneration. The regeneration of light-demanding timber species may therefore benefit from more intensive logging, or from post-harvest treatments such as thinning by poison girdling that increases light penetration. Little is known of the impact of post-harvest treatments on the floristic composition of tropical moist forests. This study therefore aimed to assess the effects of low and high selective logging (?2.33 and 4.73 trees harvested ha?1, and ?4.96 and 9.16 m2 ha?1 of basal area removed (logging + damage), respectively) - followed or not by thinning (?21.14 trees thinned ha?1, and ?6.57 m2 ha?1 of basal area removed) - on the floristic composition of a tropical moist forest in the Central African Republic, from 7 to 23 years after logging. We analyzed abundance data for 110 tree genera recorded every year for 14 years in 25 one-hectare permanent subplots. We used multivariate analysis to detect floristic variations between treatments and we assessed changes in floristic composition throughout the period. We compared floristic composition recovery between thinned and unthinned subplots, using unlogged subplots as a reference characterizing the pre-logging floristic composition. Logging and thinning had little impact on the floristic composition of the subplots as quantified 7 to 23 years later, though they did increase the proportion of pioneer species. Surprisingly, additional thinning at both logging levels failed to further distance floristic composition from that of the unlogged subplots, though it did increase disturbance intensity. Floristic composition recovery appeared to be facilitated when thinning was associated with logging. Thinning seemed to favor the growth and survival of non-pioneer species, to the detriment of pioneer species. These non-pioneer species could either be non-pioneer light demanders or shade-bearers. One explanation for this is that thinning by tree-poison girdling increased light availability without causing major damage to the forest, and thus increased the growth and survival of advance regeneration. The resulting enhanced competition then reduced the survival of pioneer species.
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Subjects: | K10 - Production forestière, F40 - Écologie végétale, F70 - Taxonomie végétale et phytogéographie, forêt tropicale humide, abattage d'arbres, composition botanique, inventaire forestier, écologie forestière, évaluation de l'impact, http://aims.fao.org/aos/agrovoc/c_7976, http://aims.fao.org/aos/agrovoc/c_2847, http://aims.fao.org/aos/agrovoc/c_15945, http://aims.fao.org/aos/agrovoc/c_24174, http://aims.fao.org/aos/agrovoc/c_3044, http://aims.fao.org/aos/agrovoc/c_37938, http://aims.fao.org/aos/agrovoc/c_29751, http://aims.fao.org/aos/agrovoc/c_1433, |
Online Access: | http://agritrop.cirad.fr/562839/ http://agritrop.cirad.fr/562839/1/document_562839.pdf |
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K10 - Production forestière F40 - Écologie végétale F70 - Taxonomie végétale et phytogéographie forêt tropicale humide abattage d'arbres composition botanique inventaire forestier écologie forestière évaluation de l'impact http://aims.fao.org/aos/agrovoc/c_7976 http://aims.fao.org/aos/agrovoc/c_2847 http://aims.fao.org/aos/agrovoc/c_15945 http://aims.fao.org/aos/agrovoc/c_24174 http://aims.fao.org/aos/agrovoc/c_3044 http://aims.fao.org/aos/agrovoc/c_37938 http://aims.fao.org/aos/agrovoc/c_29751 http://aims.fao.org/aos/agrovoc/c_1433 K10 - Production forestière F40 - Écologie végétale F70 - Taxonomie végétale et phytogéographie forêt tropicale humide abattage d'arbres composition botanique inventaire forestier écologie forestière évaluation de l'impact http://aims.fao.org/aos/agrovoc/c_7976 http://aims.fao.org/aos/agrovoc/c_2847 http://aims.fao.org/aos/agrovoc/c_15945 http://aims.fao.org/aos/agrovoc/c_24174 http://aims.fao.org/aos/agrovoc/c_3044 http://aims.fao.org/aos/agrovoc/c_37938 http://aims.fao.org/aos/agrovoc/c_29751 http://aims.fao.org/aos/agrovoc/c_1433 |
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K10 - Production forestière F40 - Écologie végétale F70 - Taxonomie végétale et phytogéographie forêt tropicale humide abattage d'arbres composition botanique inventaire forestier écologie forestière évaluation de l'impact http://aims.fao.org/aos/agrovoc/c_7976 http://aims.fao.org/aos/agrovoc/c_2847 http://aims.fao.org/aos/agrovoc/c_15945 http://aims.fao.org/aos/agrovoc/c_24174 http://aims.fao.org/aos/agrovoc/c_3044 http://aims.fao.org/aos/agrovoc/c_37938 http://aims.fao.org/aos/agrovoc/c_29751 http://aims.fao.org/aos/agrovoc/c_1433 K10 - Production forestière F40 - Écologie végétale F70 - Taxonomie végétale et phytogéographie forêt tropicale humide abattage d'arbres composition botanique inventaire forestier écologie forestière évaluation de l'impact http://aims.fao.org/aos/agrovoc/c_7976 http://aims.fao.org/aos/agrovoc/c_2847 http://aims.fao.org/aos/agrovoc/c_15945 http://aims.fao.org/aos/agrovoc/c_24174 http://aims.fao.org/aos/agrovoc/c_3044 http://aims.fao.org/aos/agrovoc/c_37938 http://aims.fao.org/aos/agrovoc/c_29751 http://aims.fao.org/aos/agrovoc/c_1433 Ouédraogo, Dakis-Yaoba Beina, Denis Picard, Nicolas Mortier, Frédéric Baya, Fidèle Gourlet-Fleury, Sylvie Thinning after selective logging facilitates floristic composition recovery in a tropical rain forest of Central Africa : Method, insights and perspectives |
description |
In the Congo Basin where most timber species are light-demanding, the low logging intensities commonly implemented (1-2 trees harvested ha?1) do not provide sufficient canopy gaps to ensure species regeneration. The regeneration of light-demanding timber species may therefore benefit from more intensive logging, or from post-harvest treatments such as thinning by poison girdling that increases light penetration. Little is known of the impact of post-harvest treatments on the floristic composition of tropical moist forests. This study therefore aimed to assess the effects of low and high selective logging (?2.33 and 4.73 trees harvested ha?1, and ?4.96 and 9.16 m2 ha?1 of basal area removed (logging + damage), respectively) - followed or not by thinning (?21.14 trees thinned ha?1, and ?6.57 m2 ha?1 of basal area removed) - on the floristic composition of a tropical moist forest in the Central African Republic, from 7 to 23 years after logging. We analyzed abundance data for 110 tree genera recorded every year for 14 years in 25 one-hectare permanent subplots. We used multivariate analysis to detect floristic variations between treatments and we assessed changes in floristic composition throughout the period. We compared floristic composition recovery between thinned and unthinned subplots, using unlogged subplots as a reference characterizing the pre-logging floristic composition. Logging and thinning had little impact on the floristic composition of the subplots as quantified 7 to 23 years later, though they did increase the proportion of pioneer species. Surprisingly, additional thinning at both logging levels failed to further distance floristic composition from that of the unlogged subplots, though it did increase disturbance intensity. Floristic composition recovery appeared to be facilitated when thinning was associated with logging. Thinning seemed to favor the growth and survival of non-pioneer species, to the detriment of pioneer species. These non-pioneer species could either be non-pioneer light demanders or shade-bearers. One explanation for this is that thinning by tree-poison girdling increased light availability without causing major damage to the forest, and thus increased the growth and survival of advance regeneration. The resulting enhanced competition then reduced the survival of pioneer species. |
format |
article |
topic_facet |
K10 - Production forestière F40 - Écologie végétale F70 - Taxonomie végétale et phytogéographie forêt tropicale humide abattage d'arbres composition botanique inventaire forestier écologie forestière évaluation de l'impact http://aims.fao.org/aos/agrovoc/c_7976 http://aims.fao.org/aos/agrovoc/c_2847 http://aims.fao.org/aos/agrovoc/c_15945 http://aims.fao.org/aos/agrovoc/c_24174 http://aims.fao.org/aos/agrovoc/c_3044 http://aims.fao.org/aos/agrovoc/c_37938 http://aims.fao.org/aos/agrovoc/c_29751 http://aims.fao.org/aos/agrovoc/c_1433 |
author |
Ouédraogo, Dakis-Yaoba Beina, Denis Picard, Nicolas Mortier, Frédéric Baya, Fidèle Gourlet-Fleury, Sylvie |
author_facet |
Ouédraogo, Dakis-Yaoba Beina, Denis Picard, Nicolas Mortier, Frédéric Baya, Fidèle Gourlet-Fleury, Sylvie |
author_sort |
Ouédraogo, Dakis-Yaoba |
title |
Thinning after selective logging facilitates floristic composition recovery in a tropical rain forest of Central Africa : Method, insights and perspectives |
title_short |
Thinning after selective logging facilitates floristic composition recovery in a tropical rain forest of Central Africa : Method, insights and perspectives |
title_full |
Thinning after selective logging facilitates floristic composition recovery in a tropical rain forest of Central Africa : Method, insights and perspectives |
title_fullStr |
Thinning after selective logging facilitates floristic composition recovery in a tropical rain forest of Central Africa : Method, insights and perspectives |
title_full_unstemmed |
Thinning after selective logging facilitates floristic composition recovery in a tropical rain forest of Central Africa : Method, insights and perspectives |
title_sort |
thinning after selective logging facilitates floristic composition recovery in a tropical rain forest of central africa : method, insights and perspectives |
url |
http://agritrop.cirad.fr/562839/ http://agritrop.cirad.fr/562839/1/document_562839.pdf |
work_keys_str_mv |
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1792498044316418048 |
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dig-cirad-fr-5628392024-01-28T19:59:06Z http://agritrop.cirad.fr/562839/ http://agritrop.cirad.fr/562839/ Thinning after selective logging facilitates floristic composition recovery in a tropical rain forest of Central Africa : Method, insights and perspectives. Ouédraogo Dakis-Yaoba, Beina Denis, Picard Nicolas, Mortier Frédéric, Baya Fidèle, Gourlet-Fleury Sylvie. 2011. Forest Ecology and Management, 262 (12) : 2176-2186.https://doi.org/10.1016/j.foreco.2011.08.009 <https://doi.org/10.1016/j.foreco.2011.08.009> Thinning after selective logging facilitates floristic composition recovery in a tropical rain forest of Central Africa : Method, insights and perspectives Ouédraogo, Dakis-Yaoba Beina, Denis Picard, Nicolas Mortier, Frédéric Baya, Fidèle Gourlet-Fleury, Sylvie eng 2011 Forest Ecology and Management K10 - Production forestière F40 - Écologie végétale F70 - Taxonomie végétale et phytogéographie forêt tropicale humide abattage d'arbres composition botanique inventaire forestier écologie forestière évaluation de l'impact http://aims.fao.org/aos/agrovoc/c_7976 http://aims.fao.org/aos/agrovoc/c_2847 http://aims.fao.org/aos/agrovoc/c_15945 http://aims.fao.org/aos/agrovoc/c_24174 http://aims.fao.org/aos/agrovoc/c_3044 http://aims.fao.org/aos/agrovoc/c_37938 fleuve Congo République centrafricaine http://aims.fao.org/aos/agrovoc/c_29751 http://aims.fao.org/aos/agrovoc/c_1433 In the Congo Basin where most timber species are light-demanding, the low logging intensities commonly implemented (1-2 trees harvested ha?1) do not provide sufficient canopy gaps to ensure species regeneration. The regeneration of light-demanding timber species may therefore benefit from more intensive logging, or from post-harvest treatments such as thinning by poison girdling that increases light penetration. Little is known of the impact of post-harvest treatments on the floristic composition of tropical moist forests. This study therefore aimed to assess the effects of low and high selective logging (?2.33 and 4.73 trees harvested ha?1, and ?4.96 and 9.16 m2 ha?1 of basal area removed (logging + damage), respectively) - followed or not by thinning (?21.14 trees thinned ha?1, and ?6.57 m2 ha?1 of basal area removed) - on the floristic composition of a tropical moist forest in the Central African Republic, from 7 to 23 years after logging. We analyzed abundance data for 110 tree genera recorded every year for 14 years in 25 one-hectare permanent subplots. We used multivariate analysis to detect floristic variations between treatments and we assessed changes in floristic composition throughout the period. We compared floristic composition recovery between thinned and unthinned subplots, using unlogged subplots as a reference characterizing the pre-logging floristic composition. Logging and thinning had little impact on the floristic composition of the subplots as quantified 7 to 23 years later, though they did increase the proportion of pioneer species. Surprisingly, additional thinning at both logging levels failed to further distance floristic composition from that of the unlogged subplots, though it did increase disturbance intensity. Floristic composition recovery appeared to be facilitated when thinning was associated with logging. Thinning seemed to favor the growth and survival of non-pioneer species, to the detriment of pioneer species. These non-pioneer species could either be non-pioneer light demanders or shade-bearers. One explanation for this is that thinning by tree-poison girdling increased light availability without causing major damage to the forest, and thus increased the growth and survival of advance regeneration. The resulting enhanced competition then reduced the survival of pioneer species. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/562839/1/document_562839.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1016/j.foreco.2011.08.009 10.1016/j.foreco.2011.08.009 http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=213985 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.foreco.2011.08.009 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1016/j.foreco.2011.08.009 |