Marie-Gabrielle Piketty

Dr. Marie-Gabrielle Piketty


Research Focus & Metrics

Academic Career Length

15Years (2012-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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30 April 2015 in Forests
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Journal Article
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MPMarie-Gabrielle Piketty
Marie-Gabrielle Piketty
RPRene Poccard
Rene Poccard
IDIsabel Drigo
Isabel Drigo
ECEmilie Coudel
Emilie Coudel
SPSophie Plassin
Sophie Plassin
MTMarcelo Thalês
Marcelo Thalês
Land use governance in the Brazilian Amazon has undergone significant changes in the last decade. At the national level, law enforcement capacity has increased and downstream industries linked to commodity chains responsible for deforestation have begun to monitor some of their suppliers’ impacts on forests. At the municipal level, local actors have launched a Green Municipality initiative, aimed at eliminating deforestation and supporting green supply chains at the territorial level. In this paper, we analyze the land use transition since 2001 in Paragominas—the first Green Municipality—and discuss the limits of the governance arrangements underpinning these changes. Our work draws on a spatially explicit analysis of biophysical variables and qualitative information collected in interviews with key private and public stakeholders of the main commodity chains operating in the region. We argue that, up to now, the emerging multi-level scheme of land governance has not succeeded in promoting large-scale land use intensification, reforestation and rehabilitation of degraded lands. Moreover, private governance mechanisms based on improved product standards, fail to benefit from potential successful partnerships between the public and private sector at the territorial level. We propose a governance approach that adopts a broader territorial focus as a way forward.

7 March 2019 in Sustainability
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ARAntonio Gabriel L. Resque
Antonio Gabriel L. Resque
ECEmilie Coudel
Emilie Coudel
MPMarie-Gabrielle Piketty
Marie-Gabrielle Piketty
NCNathalie Cialdella
Nathalie Cialdella
MPMarc Piraux
Marc Piraux
CPChristophe Le Page
Christophe Le Page
The last few years have seen the emergence of different initiatives designed to promote the biodiversification of agroecosystems as a counterpoint to the global expansion of homogenized industrial agriculture. In Brazil, two food procurement programs demonstrate the potential to promote discussions related to this agroecological transition: the National School Meal Program (Programa Nacional de Alimentação Escolar, PNAE) and the Food Procurement Program (Programa de Aquisição de Alimentos, PAA). The objectives of this paper are to analyze: (a) how these procurement programs currently integrate agrobiodiversity (crops and cropping systems) according to the local context; (b) the main challenges that key stakeholders perceive for the adoption of biodiverse systems; and (c) the extent to which the key stakeholders involved in these programs associate agrobiodiversity with the provision of ecosystem services. We carried out this research in 2017 in two contrasting municipalities in the eastern part of the Brazilian Amazon, Paragominas and Irituia. Our research shows that these programs have included up to 42 species in Irituia and 32 species in Paragominas. Perennial crop species are the most common type of culture in Irituia (up to 50%), while vegetables are the most common in Paragominas (up to 47%). Although in both municipalities stakeholders identify a large number of ecosystem services (up to 17), services mentioned in Irituia were more closely related to agrobiodiversity. Stakeholders indirectly associated with the programs have a broader view of ecosystem services. We conclude that these procurement programs can be useful tools to promote the biodiversification of local production systems, but their potential may depend on involving institutions not directly associated with their administration. Additionally, despite the observed differences in production context, providing more ecosystem services appears to be a compelling motivation for promoting changes in agroecosystems.

20 November 2015 in Forests
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Journal Article
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MPMarie-Gabrielle Piketty
Marie-Gabrielle Piketty
IDIsabel Drigo
Isabel Drigo
PSPhilippe Sablayrolles
Philippe Sablayrolles
EAEvandro Araujo De Aquino
Evandro Araujo De Aquino
DPDriss Pena
Driss Pena
PSPlinio Sist
Plinio Sist
Community forest management (CFM) is considered an alternative way to protect forests while providing income for smallholders. Since the mid-1990s, the number of CFM projects has rapidly increased in the Brazilian Amazon, although most of them still face several difficulties. In this paper, we discuss the obstacles to the financial viability of CFM in this region and propose some ways to overcome them. Based on evidence from five case studies, we assess the extent to which sustainable forest management for commercial timber production contributes to smallholder income. We show that harvesting timber only provides a limited cash income to smallholders, even though forest covers 80% of their landholding. Market access to timber is very uncertain and smallholder communities often fail to make a profit from their timber. Minimum remunerative public prices and support for timber marketing are thus needed. Simpler and more flexible procedures are required to reduce the high transaction costs of obtaining a permit and increase smallholder involvement in legal forest management for commercial purposes. Finally, a better assessment of timber potential in smallholder forest reserves through systematic inventories would be useful to avoid arousing false expectations.

1 January 2017 in Echogéo
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Journal Article
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FLFrançois Laurent
François Laurent
DADamien Arvor
Damien Arvor
MDMarion Daugeard
Marion Daugeard
ROReinis Osis
Reinis Osis
ITIsabelle Tritsch
Isabelle Tritsch
FMFrançois Messner
François Messner
L’Amazonie a amorcé depuis quelques années une baisse de la déforestation couplée à un développement économique. Le processus est cependant inégal. Si les grands et moyens producteurs font évoluer leurs systèmes de production vers l’intensification et la diversification dans les espaces déjà ouverts, délaissant en apparence les stratégies d’expansion, l’agriculture familiale reste à l’écart du découplage entre production et déforestation. Dans cet article, les engagements des pouvoirs publics et des filières, leurs effets en matière de déforestation et les inégalités d’adaptation sont analysés à l’échelle de l’Amazonie Légale et à celle d’une municipalité considérée comme un modèle car à l’initiative d’une démarche de Município Verde : Paragominas, en Amazonie orientale.

1 November 2012 in Applied Economics
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Journal Article
Closed access
TMTatiane Almeida de Menezes
Tatiane Almeida de Menezes
MPMarie-Gabrielle Piketty
Marie-Gabrielle Piketty
Brazil is a major exporter of several agricultural commodities and has shown strong interest in agricultural trade negotiations. For several commodities, trade liberalization is expected to be followed by farmgate prices increase and to boost domestic production. However, in a country as big as Brazil, possible supply responses to price increase will probably strongly differ from one region to another. This article focuses on soya beans for which Brazil became a top exporter. The panel data technique is used to estimate the soy bean supply response at national and regional level. Soya bean supply is shown to be very price elastic. Moreover, soya bean supply own price elasticity is much higher in the Center-North regions than in the South of the country. Substitution between livestock and soya bean is also very significant in the Center-North region. World agricultural trade models should take account for such regional variability of soya bean supply elasticity. The results also allow us to discuss the issue of soya bean expansion at the Amazon border.

12 July 2024 in Regional Environmental Change
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DKDavid Katz-Asprilla
David Katz-Asprilla
MPMarie-Gabrielle Piketty
Marie-Gabrielle Piketty
GCGuido Briceño Castillo
Guido Briceño Castillo
LBLilian Blanc
Lilian Blanc
JPJhon Camacho Peña
Jhon Camacho Peña
AKAlain Karsenty
Alain Karsenty
Deforestation has been at the heart of the transformation of the Amazon. Global concerns over deforestation and its impact on climate change have resulted in the adoption of a number of initiatives in the framework of zero deforestation. However, undifferentiated application of the concepts of zero net, gross, and illegal deforestation has revealed a lack of understanding of their scope and of challenges to their implementation. Zero legal and illegal deforestation is, in particular, a controversial subject from the point of view of regulation and sovereignty but an essential aspect from the perspective of public policy design. In Colombia, zero deforestation commitments make no mention of legal deforestation. Papers that analyze deforestation and official data sources fail to incorporate the legal dimension in their analysis. This article addresses this gap by identifying areas where deforestation is legal and where it is illegal in one deforestation hotspot of the Colombian Amazon, the administrative department of Guaviare. Our results show that deforestation has increased since 2013, mainly occurs in illegal zones, and that Guaviare department, 85% of which is covered by forest, has very little legal deforestation potential. Our findings reveal that assessing the legality and illegality of deforestation is more complex than often assumed and must become a priority, especially in forested countries where regulation on forest and land management is shared between different level of governments and institutions.