Biomass and nutrient dynamics in a littoral savanna subjected to annual fires in Congo
The dynamics of nutrient accumulation were studied between two annual fires in a herbaceous savanna of the Congolese littoral region. Trees and shrubs were not studied because of their very low density. After fire the aboveground biomass increased for 10 months up to a maximum of 520 g m-2. The underground biomass amounted to roughly 630 g m-2 during the dry season and increased after the fire up to a maximum of 870 g m-2 during the rainy season. In the aerial parts, the accumulation dynamics differed according to the type of nutrient: Ca accumulation was steady until the following dry season in proportion to the total biomass, while the pattern of K accumulation was similar to the living biomass dynamic and reached a maximum four months after the fire. N, P and Mg followed a middle course. For the underground biomass, N accumulation reached a maximum value at the end of the rainy season (10 g m-2) and decreased at the beginning of the dry season. Most of this element was incorporated into the root system. During the rainy season, accumulation in the root system was of the same order of magnitude as in the aerial parts for P and Ca, whereas it was much lower for K and Mg. Transfers of nutrients to the atmosphere during the annual burning amounted, respectively, to 85, 25, 39, 21 and 28% of the amounts of N, P, K, Ca and Mg accumulated in the aerial biomass and litter components. Losses during fire were small for P, K, Ca and Mg compared to the available soil reserves, but not for N. The legume Eriosema erici-rosenii ought to play an important role in N input in this ecosystem.
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Subjects: | P35 - Fertilité du sol, savane, biomasse, transport des substances nutritives, incendie spontané, Fixation de l'azote, http://aims.fao.org/aos/agrovoc/c_6825, http://aims.fao.org/aos/agrovoc/c_926, http://aims.fao.org/aos/agrovoc/c_5272, http://aims.fao.org/aos/agrovoc/c_34150, http://aims.fao.org/aos/agrovoc/c_5196, http://aims.fao.org/aos/agrovoc/c_1811, |
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dig-cirad-fr-4888992024-01-28T10:14:12Z http://agritrop.cirad.fr/488899/ http://agritrop.cirad.fr/488899/ Biomass and nutrient dynamics in a littoral savanna subjected to annual fires in Congo. Laclau Jean-Paul, Sama-Poumba Wilfrid, De Dieu Nzila Jean, Bouillet Jean-Pierre, Ranger Jacques. 2002. Acta Oecologica, 23 : 41-50.https://doi.org/10.1016/S1146-609X(02)01132-3 <https://doi.org/10.1016/S1146-609X(02)01132-3> Biomass and nutrient dynamics in a littoral savanna subjected to annual fires in Congo Laclau, Jean-Paul Sama-Poumba, Wilfrid De Dieu Nzila, Jean Bouillet, Jean-Pierre Ranger, Jacques eng 2002 Acta Oecologica P35 - Fertilité du sol savane biomasse transport des substances nutritives incendie spontané Fixation de l'azote http://aims.fao.org/aos/agrovoc/c_6825 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_5272 http://aims.fao.org/aos/agrovoc/c_34150 http://aims.fao.org/aos/agrovoc/c_5196 Congo http://aims.fao.org/aos/agrovoc/c_1811 The dynamics of nutrient accumulation were studied between two annual fires in a herbaceous savanna of the Congolese littoral region. Trees and shrubs were not studied because of their very low density. After fire the aboveground biomass increased for 10 months up to a maximum of 520 g m-2. The underground biomass amounted to roughly 630 g m-2 during the dry season and increased after the fire up to a maximum of 870 g m-2 during the rainy season. In the aerial parts, the accumulation dynamics differed according to the type of nutrient: Ca accumulation was steady until the following dry season in proportion to the total biomass, while the pattern of K accumulation was similar to the living biomass dynamic and reached a maximum four months after the fire. N, P and Mg followed a middle course. For the underground biomass, N accumulation reached a maximum value at the end of the rainy season (10 g m-2) and decreased at the beginning of the dry season. Most of this element was incorporated into the root system. During the rainy season, accumulation in the root system was of the same order of magnitude as in the aerial parts for P and Ca, whereas it was much lower for K and Mg. Transfers of nutrients to the atmosphere during the annual burning amounted, respectively, to 85, 25, 39, 21 and 28% of the amounts of N, P, K, Ca and Mg accumulated in the aerial biomass and litter components. Losses during fire were small for P, K, Ca and Mg compared to the available soil reserves, but not for N. The legume Eriosema erici-rosenii ought to play an important role in N input in this ecosystem. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/488899/1/488899.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1016/S1146-609X(02)01132-3 10.1016/S1146-609X(02)01132-3 http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=171983 info:eu-repo/semantics/altIdentifier/doi/10.1016/S1146-609X(02)01132-3 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1016/S1146-609X(02)01132-3 |
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P35 - Fertilité du sol savane biomasse transport des substances nutritives incendie spontané Fixation de l'azote http://aims.fao.org/aos/agrovoc/c_6825 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_5272 http://aims.fao.org/aos/agrovoc/c_34150 http://aims.fao.org/aos/agrovoc/c_5196 http://aims.fao.org/aos/agrovoc/c_1811 P35 - Fertilité du sol savane biomasse transport des substances nutritives incendie spontané Fixation de l'azote http://aims.fao.org/aos/agrovoc/c_6825 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_5272 http://aims.fao.org/aos/agrovoc/c_34150 http://aims.fao.org/aos/agrovoc/c_5196 http://aims.fao.org/aos/agrovoc/c_1811 |
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P35 - Fertilité du sol savane biomasse transport des substances nutritives incendie spontané Fixation de l'azote http://aims.fao.org/aos/agrovoc/c_6825 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_5272 http://aims.fao.org/aos/agrovoc/c_34150 http://aims.fao.org/aos/agrovoc/c_5196 http://aims.fao.org/aos/agrovoc/c_1811 P35 - Fertilité du sol savane biomasse transport des substances nutritives incendie spontané Fixation de l'azote http://aims.fao.org/aos/agrovoc/c_6825 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_5272 http://aims.fao.org/aos/agrovoc/c_34150 http://aims.fao.org/aos/agrovoc/c_5196 http://aims.fao.org/aos/agrovoc/c_1811 Laclau, Jean-Paul Sama-Poumba, Wilfrid De Dieu Nzila, Jean Bouillet, Jean-Pierre Ranger, Jacques Biomass and nutrient dynamics in a littoral savanna subjected to annual fires in Congo |
description |
The dynamics of nutrient accumulation were studied between two annual fires in a herbaceous savanna of the Congolese littoral region. Trees and shrubs were not studied because of their very low density. After fire the aboveground biomass increased for 10 months up to a maximum of 520 g m-2. The underground biomass amounted to roughly 630 g m-2 during the dry season and increased after the fire up to a maximum of 870 g m-2 during the rainy season. In the aerial parts, the accumulation dynamics differed according to the type of nutrient: Ca accumulation was steady until the following dry season in proportion to the total biomass, while the pattern of K accumulation was similar to the living biomass dynamic and reached a maximum four months after the fire. N, P and Mg followed a middle course. For the underground biomass, N accumulation reached a maximum value at the end of the rainy season (10 g m-2) and decreased at the beginning of the dry season. Most of this element was incorporated into the root system. During the rainy season, accumulation in the root system was of the same order of magnitude as in the aerial parts for P and Ca, whereas it was much lower for K and Mg. Transfers of nutrients to the atmosphere during the annual burning amounted, respectively, to 85, 25, 39, 21 and 28% of the amounts of N, P, K, Ca and Mg accumulated in the aerial biomass and litter components. Losses during fire were small for P, K, Ca and Mg compared to the available soil reserves, but not for N. The legume Eriosema erici-rosenii ought to play an important role in N input in this ecosystem. |
format |
article |
topic_facet |
P35 - Fertilité du sol savane biomasse transport des substances nutritives incendie spontané Fixation de l'azote http://aims.fao.org/aos/agrovoc/c_6825 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_5272 http://aims.fao.org/aos/agrovoc/c_34150 http://aims.fao.org/aos/agrovoc/c_5196 http://aims.fao.org/aos/agrovoc/c_1811 |
author |
Laclau, Jean-Paul Sama-Poumba, Wilfrid De Dieu Nzila, Jean Bouillet, Jean-Pierre Ranger, Jacques |
author_facet |
Laclau, Jean-Paul Sama-Poumba, Wilfrid De Dieu Nzila, Jean Bouillet, Jean-Pierre Ranger, Jacques |
author_sort |
Laclau, Jean-Paul |
title |
Biomass and nutrient dynamics in a littoral savanna subjected to annual fires in Congo |
title_short |
Biomass and nutrient dynamics in a littoral savanna subjected to annual fires in Congo |
title_full |
Biomass and nutrient dynamics in a littoral savanna subjected to annual fires in Congo |
title_fullStr |
Biomass and nutrient dynamics in a littoral savanna subjected to annual fires in Congo |
title_full_unstemmed |
Biomass and nutrient dynamics in a littoral savanna subjected to annual fires in Congo |
title_sort |
biomass and nutrient dynamics in a littoral savanna subjected to annual fires in congo |
url |
http://agritrop.cirad.fr/488899/ http://agritrop.cirad.fr/488899/1/488899.pdf |
work_keys_str_mv |
AT laclaujeanpaul biomassandnutrientdynamicsinalittoralsavannasubjectedtoannualfiresincongo AT samapoumbawilfrid biomassandnutrientdynamicsinalittoralsavannasubjectedtoannualfiresincongo AT dedieunzilajean biomassandnutrientdynamicsinalittoralsavannasubjectedtoannualfiresincongo AT bouilletjeanpierre biomassandnutrientdynamicsinalittoralsavannasubjectedtoannualfiresincongo AT rangerjacques biomassandnutrientdynamicsinalittoralsavannasubjectedtoannualfiresincongo |
_version_ |
1792495214641807360 |