The function of the superficial root mat in the biogeochemical cycles of nutrients congolese Euclayptus plantations
Background and aims: The importance of superficial root mats inside the forest floor for the nutrition of Amazonian rain forests has been extensively investigated. The present study was aimed at assessing the function of a root mat adherent to decomposing organic material observed in Eucalyptus plantations. Methods: The development of the root mat was studied through micromorphological observations of thin litter sections, and the influence of soil microtopography and soil water repellency on root mat biomass was assessed in situ on an area of 5 m2. In addition, input-output budgets of nutrients within the forest floor were established from measurements of litterfall, dissolved nutrients in gravitational solutions, and forest floor nutrient contents. Key findings: The amounts of nutrients released during litter decay in this ecosystem during the period of study were, on average, 46, 3, 4, 19 and 17 kg/ha/year for N, P, K, Ca and Mg, respectively. The simultaneous measurements of the chemical composition of throughfall solutions and leachates beneath the forest floor showed a very quick uptake of nutrients by the root mat during the decomposition processes. Indeed, the solutions did not become noticeably enriched in nutrients during their passage through the holorganic layer, despite large amounts of elements being released during litter decay. The root mat biomass decreased significantly during the dry season, and a preferential development in microdepressions at the soil surface was observed. A strong water repellency observed in these depressions might enhance the ability of the roots to take up water and nutrients during the dry periods. Conclusions: The root mat was active throughout the year to catch the flux of nutrients from the biodegradation of the forest floor, preventing the transfer of dissolved nutrients toward deeper soil horizons. This mechanism is involved in the successful adaptation of this Eucalyptus hybrid in areas covered by 'climacic' savannas in Congo.
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Subjects: | F61 - Physiologie végétale - Nutrition, P33 - Chimie et physique du sol, Eucalyptus, nutrition des plantes, transport des substances nutritives, absorption, composition chimique, analyse de sol, http://aims.fao.org/aos/agrovoc/c_2683, http://aims.fao.org/aos/agrovoc/c_16379, http://aims.fao.org/aos/agrovoc/c_5272, http://aims.fao.org/aos/agrovoc/c_27, http://aims.fao.org/aos/agrovoc/c_1794, http://aims.fao.org/aos/agrovoc/c_7198, |
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dig-cirad-fr-5198562024-01-28T12:26:26Z http://agritrop.cirad.fr/519856/ http://agritrop.cirad.fr/519856/ The function of the superficial root mat in the biogeochemical cycles of nutrients congolese Euclayptus plantations. Laclau Jean-Paul, Toutain Bernard, Thongo M'Bou Armel, Arnaud Michel, Joffre Richard, Ranger Jacques. 2004. Annals of Botany, 93 (3) : 249-261.https://doi.org/10.1093/aob/mch035 <https://doi.org/10.1093/aob/mch035> The function of the superficial root mat in the biogeochemical cycles of nutrients congolese Euclayptus plantations Laclau, Jean-Paul Toutain, Bernard Thongo M'Bou, Armel Arnaud, Michel Joffre, Richard Ranger, Jacques eng 2004 Annals of Botany F61 - Physiologie végétale - Nutrition P33 - Chimie et physique du sol Eucalyptus nutrition des plantes transport des substances nutritives absorption composition chimique analyse de sol http://aims.fao.org/aos/agrovoc/c_2683 http://aims.fao.org/aos/agrovoc/c_16379 http://aims.fao.org/aos/agrovoc/c_5272 http://aims.fao.org/aos/agrovoc/c_27 http://aims.fao.org/aos/agrovoc/c_1794 http://aims.fao.org/aos/agrovoc/c_7198 Background and aims: The importance of superficial root mats inside the forest floor for the nutrition of Amazonian rain forests has been extensively investigated. The present study was aimed at assessing the function of a root mat adherent to decomposing organic material observed in Eucalyptus plantations. Methods: The development of the root mat was studied through micromorphological observations of thin litter sections, and the influence of soil microtopography and soil water repellency on root mat biomass was assessed in situ on an area of 5 m2. In addition, input-output budgets of nutrients within the forest floor were established from measurements of litterfall, dissolved nutrients in gravitational solutions, and forest floor nutrient contents. Key findings: The amounts of nutrients released during litter decay in this ecosystem during the period of study were, on average, 46, 3, 4, 19 and 17 kg/ha/year for N, P, K, Ca and Mg, respectively. The simultaneous measurements of the chemical composition of throughfall solutions and leachates beneath the forest floor showed a very quick uptake of nutrients by the root mat during the decomposition processes. Indeed, the solutions did not become noticeably enriched in nutrients during their passage through the holorganic layer, despite large amounts of elements being released during litter decay. The root mat biomass decreased significantly during the dry season, and a preferential development in microdepressions at the soil surface was observed. A strong water repellency observed in these depressions might enhance the ability of the roots to take up water and nutrients during the dry periods. Conclusions: The root mat was active throughout the year to catch the flux of nutrients from the biodegradation of the forest floor, preventing the transfer of dissolved nutrients toward deeper soil horizons. This mechanism is involved in the successful adaptation of this Eucalyptus hybrid in areas covered by 'climacic' savannas in Congo. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/519856/1/519856.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1093/aob/mch035 10.1093/aob/mch035 http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=181481 info:eu-repo/semantics/altIdentifier/doi/10.1093/aob/mch035 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1093/aob/mch035 |
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F61 - Physiologie végétale - Nutrition P33 - Chimie et physique du sol Eucalyptus nutrition des plantes transport des substances nutritives absorption composition chimique analyse de sol http://aims.fao.org/aos/agrovoc/c_2683 http://aims.fao.org/aos/agrovoc/c_16379 http://aims.fao.org/aos/agrovoc/c_5272 http://aims.fao.org/aos/agrovoc/c_27 http://aims.fao.org/aos/agrovoc/c_1794 http://aims.fao.org/aos/agrovoc/c_7198 F61 - Physiologie végétale - Nutrition P33 - Chimie et physique du sol Eucalyptus nutrition des plantes transport des substances nutritives absorption composition chimique analyse de sol http://aims.fao.org/aos/agrovoc/c_2683 http://aims.fao.org/aos/agrovoc/c_16379 http://aims.fao.org/aos/agrovoc/c_5272 http://aims.fao.org/aos/agrovoc/c_27 http://aims.fao.org/aos/agrovoc/c_1794 http://aims.fao.org/aos/agrovoc/c_7198 |
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F61 - Physiologie végétale - Nutrition P33 - Chimie et physique du sol Eucalyptus nutrition des plantes transport des substances nutritives absorption composition chimique analyse de sol http://aims.fao.org/aos/agrovoc/c_2683 http://aims.fao.org/aos/agrovoc/c_16379 http://aims.fao.org/aos/agrovoc/c_5272 http://aims.fao.org/aos/agrovoc/c_27 http://aims.fao.org/aos/agrovoc/c_1794 http://aims.fao.org/aos/agrovoc/c_7198 F61 - Physiologie végétale - Nutrition P33 - Chimie et physique du sol Eucalyptus nutrition des plantes transport des substances nutritives absorption composition chimique analyse de sol http://aims.fao.org/aos/agrovoc/c_2683 http://aims.fao.org/aos/agrovoc/c_16379 http://aims.fao.org/aos/agrovoc/c_5272 http://aims.fao.org/aos/agrovoc/c_27 http://aims.fao.org/aos/agrovoc/c_1794 http://aims.fao.org/aos/agrovoc/c_7198 Laclau, Jean-Paul Toutain, Bernard Thongo M'Bou, Armel Arnaud, Michel Joffre, Richard Ranger, Jacques The function of the superficial root mat in the biogeochemical cycles of nutrients congolese Euclayptus plantations |
description |
Background and aims: The importance of superficial root mats inside the forest floor for the nutrition of Amazonian rain forests has been extensively investigated. The present study was aimed at assessing the function of a root mat adherent to decomposing organic material observed in Eucalyptus plantations. Methods: The development of the root mat was studied through micromorphological observations of thin litter sections, and the influence of soil microtopography and soil water repellency on root mat biomass was assessed in situ on an area of 5 m2. In addition, input-output budgets of nutrients within the forest floor were established from measurements of litterfall, dissolved nutrients in gravitational solutions, and forest floor nutrient contents. Key findings: The amounts of nutrients released during litter decay in this ecosystem during the period of study were, on average, 46, 3, 4, 19 and 17 kg/ha/year for N, P, K, Ca and Mg, respectively. The simultaneous measurements of the chemical composition of throughfall solutions and leachates beneath the forest floor showed a very quick uptake of nutrients by the root mat during the decomposition processes. Indeed, the solutions did not become noticeably enriched in nutrients during their passage through the holorganic layer, despite large amounts of elements being released during litter decay. The root mat biomass decreased significantly during the dry season, and a preferential development in microdepressions at the soil surface was observed. A strong water repellency observed in these depressions might enhance the ability of the roots to take up water and nutrients during the dry periods. Conclusions: The root mat was active throughout the year to catch the flux of nutrients from the biodegradation of the forest floor, preventing the transfer of dissolved nutrients toward deeper soil horizons. This mechanism is involved in the successful adaptation of this Eucalyptus hybrid in areas covered by 'climacic' savannas in Congo. |
format |
article |
topic_facet |
F61 - Physiologie végétale - Nutrition P33 - Chimie et physique du sol Eucalyptus nutrition des plantes transport des substances nutritives absorption composition chimique analyse de sol http://aims.fao.org/aos/agrovoc/c_2683 http://aims.fao.org/aos/agrovoc/c_16379 http://aims.fao.org/aos/agrovoc/c_5272 http://aims.fao.org/aos/agrovoc/c_27 http://aims.fao.org/aos/agrovoc/c_1794 http://aims.fao.org/aos/agrovoc/c_7198 |
author |
Laclau, Jean-Paul Toutain, Bernard Thongo M'Bou, Armel Arnaud, Michel Joffre, Richard Ranger, Jacques |
author_facet |
Laclau, Jean-Paul Toutain, Bernard Thongo M'Bou, Armel Arnaud, Michel Joffre, Richard Ranger, Jacques |
author_sort |
Laclau, Jean-Paul |
title |
The function of the superficial root mat in the biogeochemical cycles of nutrients congolese Euclayptus plantations |
title_short |
The function of the superficial root mat in the biogeochemical cycles of nutrients congolese Euclayptus plantations |
title_full |
The function of the superficial root mat in the biogeochemical cycles of nutrients congolese Euclayptus plantations |
title_fullStr |
The function of the superficial root mat in the biogeochemical cycles of nutrients congolese Euclayptus plantations |
title_full_unstemmed |
The function of the superficial root mat in the biogeochemical cycles of nutrients congolese Euclayptus plantations |
title_sort |
function of the superficial root mat in the biogeochemical cycles of nutrients congolese euclayptus plantations |
url |
http://agritrop.cirad.fr/519856/ http://agritrop.cirad.fr/519856/1/519856.pdf |
work_keys_str_mv |
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