Assessing the level of organization in agroforestry systems
Agroforestry systems are generally characterized by several parameters, such as the number of plant species, the density of each species, or various biodiversity indexes. Many systems have a main crop, like coffee or cacao. In such systems, the ratio of the number of trees of the main crop to the total number of trees (the main crop plus the associated species) is also used to characterize the system. This parameter can vary from 1, in the case of a pure crop, to a value near 0 in more complex systems. This parameter assesses the relative density of the main species, but it does not provide an idea of the organization of a system. Indeed, for the same relative density, the system may be completely spatially regular or completely disordered with pockets of the pure main crop alternating with pockets without main crop trees. To estimate the level of organization in agroforestry systems with a main crop, we propose an index which varies from 0 to 1. For a given area, the plot is split into n sub-plots with the same area. In each sub-plot, the relative density is estimated, i.e. the number of trees of the main crop out of the total number of trees. The index En is expressed as the ratio of the relative minimum density obtained in one of the n sub-plots to the relative density estimated for the whole plot. In the case of a very regular system En =1 whereas in very irregular systems En -> 0. A second index of the organization of the system is the speed of convergence of En to E1 when n decreases (n -> n/2 ...-> 1). Several examples are presented to illustrate the relevance of these parameters, which could help to more effectively compare agroforestry systems. (Texte intégral)
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Subjects: | F08 - Systèmes et modes de culture, K01 - Foresterie - Considérations générales, Coffea, Theobroma cacao, agroforesterie, http://aims.fao.org/aos/agrovoc/c_1720, http://aims.fao.org/aos/agrovoc/c_7713, http://aims.fao.org/aos/agrovoc/c_207, |
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dig-cirad-fr-5536312024-03-05T07:15:59Z http://agritrop.cirad.fr/553631/ http://agritrop.cirad.fr/553631/ Assessing the level of organization in agroforestry systems. Cilas Christian, Jagoret Patrick, Avelino Jacques. 2009. In : Book of abstracts of the 2nd World Congress of Agroforestry, 23-28 August 2009, Nairobi, Kenya : Agroforestry, the future of global land use. ICRAF. Nairobi : WCA [Nairobi], Résumé, 381. ISBN 978-92-9059-255-6 World Congress of Agroforestry. 2, Nairobi, Kenya, 23 Août 2009/28 Août 2009. Assessing the level of organization in agroforestry systems Cilas, Christian Jagoret, Patrick Avelino, Jacques eng 2009 WCA [Nairobi] Book of abstracts of the 2nd World Congress of Agroforestry, 23-28 August 2009, Nairobi, Kenya : Agroforestry, the future of global land use F08 - Systèmes et modes de culture K01 - Foresterie - Considérations générales Coffea Theobroma cacao agroforesterie http://aims.fao.org/aos/agrovoc/c_1720 http://aims.fao.org/aos/agrovoc/c_7713 http://aims.fao.org/aos/agrovoc/c_207 Agroforestry systems are generally characterized by several parameters, such as the number of plant species, the density of each species, or various biodiversity indexes. Many systems have a main crop, like coffee or cacao. In such systems, the ratio of the number of trees of the main crop to the total number of trees (the main crop plus the associated species) is also used to characterize the system. This parameter can vary from 1, in the case of a pure crop, to a value near 0 in more complex systems. This parameter assesses the relative density of the main species, but it does not provide an idea of the organization of a system. Indeed, for the same relative density, the system may be completely spatially regular or completely disordered with pockets of the pure main crop alternating with pockets without main crop trees. To estimate the level of organization in agroforestry systems with a main crop, we propose an index which varies from 0 to 1. For a given area, the plot is split into n sub-plots with the same area. In each sub-plot, the relative density is estimated, i.e. the number of trees of the main crop out of the total number of trees. The index En is expressed as the ratio of the relative minimum density obtained in one of the n sub-plots to the relative density estimated for the whole plot. In the case of a very regular system En =1 whereas in very irregular systems En -> 0. A second index of the organization of the system is the speed of convergence of En to E1 when n decreases (n -> n/2 ...-> 1). Several examples are presented to illustrate the relevance of these parameters, which could help to more effectively compare agroforestry systems. (Texte intégral) conference_item info:eu-repo/semantics/conferenceObject Conference info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/553631/1/document_553631.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=207202 |
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F08 - Systèmes et modes de culture K01 - Foresterie - Considérations générales Coffea Theobroma cacao agroforesterie http://aims.fao.org/aos/agrovoc/c_1720 http://aims.fao.org/aos/agrovoc/c_7713 http://aims.fao.org/aos/agrovoc/c_207 F08 - Systèmes et modes de culture K01 - Foresterie - Considérations générales Coffea Theobroma cacao agroforesterie http://aims.fao.org/aos/agrovoc/c_1720 http://aims.fao.org/aos/agrovoc/c_7713 http://aims.fao.org/aos/agrovoc/c_207 |
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F08 - Systèmes et modes de culture K01 - Foresterie - Considérations générales Coffea Theobroma cacao agroforesterie http://aims.fao.org/aos/agrovoc/c_1720 http://aims.fao.org/aos/agrovoc/c_7713 http://aims.fao.org/aos/agrovoc/c_207 F08 - Systèmes et modes de culture K01 - Foresterie - Considérations générales Coffea Theobroma cacao agroforesterie http://aims.fao.org/aos/agrovoc/c_1720 http://aims.fao.org/aos/agrovoc/c_7713 http://aims.fao.org/aos/agrovoc/c_207 Cilas, Christian Jagoret, Patrick Avelino, Jacques Assessing the level of organization in agroforestry systems |
description |
Agroforestry systems are generally characterized by several parameters, such as the number of plant species, the density of each species, or various biodiversity indexes. Many systems have a main crop, like coffee or cacao. In such systems, the ratio of the number of trees of the main crop to the total number of trees (the main crop plus the associated species) is also used to characterize the system. This parameter can vary from 1, in the case of a pure crop, to a value near 0 in more complex systems. This parameter assesses the relative density of the main species, but it does not provide an idea of the organization of a system. Indeed, for the same relative density, the system may be completely spatially regular or completely disordered with pockets of the pure main crop alternating with pockets without main crop trees. To estimate the level of organization in agroforestry systems with a main crop, we propose an index which varies from 0 to 1. For a given area, the plot is split into n sub-plots with the same area. In each sub-plot, the relative density is estimated, i.e. the number of trees of the main crop out of the total number of trees. The index En is expressed as the ratio of the relative minimum density obtained in one of the n sub-plots to the relative density estimated for the whole plot. In the case of a very regular system En =1 whereas in very irregular systems En -> 0. A second index of the organization of the system is the speed of convergence of En to E1 when n decreases (n -> n/2 ...-> 1). Several examples are presented to illustrate the relevance of these parameters, which could help to more effectively compare agroforestry systems. (Texte intégral) |
format |
conference_item |
topic_facet |
F08 - Systèmes et modes de culture K01 - Foresterie - Considérations générales Coffea Theobroma cacao agroforesterie http://aims.fao.org/aos/agrovoc/c_1720 http://aims.fao.org/aos/agrovoc/c_7713 http://aims.fao.org/aos/agrovoc/c_207 |
author |
Cilas, Christian Jagoret, Patrick Avelino, Jacques |
author_facet |
Cilas, Christian Jagoret, Patrick Avelino, Jacques |
author_sort |
Cilas, Christian |
title |
Assessing the level of organization in agroforestry systems |
title_short |
Assessing the level of organization in agroforestry systems |
title_full |
Assessing the level of organization in agroforestry systems |
title_fullStr |
Assessing the level of organization in agroforestry systems |
title_full_unstemmed |
Assessing the level of organization in agroforestry systems |
title_sort |
assessing the level of organization in agroforestry systems |
publisher |
WCA [Nairobi] |
url |
http://agritrop.cirad.fr/553631/ http://agritrop.cirad.fr/553631/1/document_553631.pdf |
work_keys_str_mv |
AT cilaschristian assessingtheleveloforganizationinagroforestrysystems AT jagoretpatrick assessingtheleveloforganizationinagroforestrysystems AT avelinojacques assessingtheleveloforganizationinagroforestrysystems |
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1794797410572042240 |