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ArticleJournal articleAllometric equation for estimating tree above ground biomass modified by ecological environmental factors in tropical dipterocarp forests
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Tropical Dipterocarp Forest (DF) plays an important role in mitigating climate change thanks to its carbon sequestration capacity. In order to estimate the CO2 absorption capacity of DF as a basis for the development of forest ecological services, a system of biomass equations is needed; while very few models for estimating biomass in DF have been published and have not yet reflected the impact of ecological environmental factors. The purpose of the study was to validate and select the best model for estimating tree above ground biomass (AGB, kg) in DF under the influence of ecological environmental factors, thereby improving the reliability. Twenty-eight 0.25 ha plots in the Central Highlands and one 1 ha plot in the Southeast ecoregion in Viet Nam were measured. A total of 329 trees were destructively sampled to obtain a dataset of AGB; Methods for developing equations were weighted nonlinear fixed/mixed models with/without random effects fit by Maximum Likelihood; Using K-fold cross validation with K = 10, we compared and selected the best model with and without ecological environmental factors. As a result, separate ecological environmental factors did not affect AGB, while the combination of the factors influences the AGB model through the form: AGB = AVERAGE × MODIFIER, AGB = a × Db ×WDd × exp (e2 × (P - 1502) + e3 × (BA - 12.62)) that was significantly more reliable than a model without these factors involved; where D (cm), WD (g / cm3), P (mm year-1) and BA (m2 ha-1) are the diameter at breast height, wood density, averaged annual rainfall and total basal area of forest stand, respectively. Keywords: above ground biomass, dipterocarp forest, ecological factor ID: 3473259 -
Book (stand-alone)Technical studyPlan méthodologique pour l’élaboration des équations allométriques pour l’estimation du volume et de la biomasse des principales espèces forestières en Tunisie 2025
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No results found.L’augmentation de la concentration des gaz à effet de serre dans l’atmosphère terrestre est l’un des facteurs responsables du réchauffement climatique et de la dégradation de la couche d’ozone. Ces résultats catastrophiques à court et à long terme ont confirmé l’impact des gaz à effet de serre sur l’avenir de notre planète et ont incité les instances internationales à entreprendre plusieurs actions visant principalement à réduire les émissions des gaz à effet de serre et à augmenter leur séquestration. Dans le but de satisfaire aux exigences de la Convention-cadre des Nations Unies sur les changements climatiques, la Tunisie a mis en place une stratégie nationale de réduction des émissions causées par le déboisement et la dégradation des forêts dans les pays en développement qui comprend l’inventaire du carbone forestier ainsi qu’une méthodologie de suivi, de rapportage et de vérification. Pour convertir les données des inventaires forestiers en estimation d’émissions ou de stockage de carbone pour le pays, il faut utiliser des équations allométriques. Reconnaissant l’absence d’un tel outil d’estimation, la Direction générale des forêts, avec l’appui financier de la Banque mondiale et l’assistance technique de l’Organisation des Nations Unies pour l’alimentation et l’agriculture a sollicité les services de l’Institut national de la recherche en génie rural, eaux et forêts afin d’établir un état des lieux sur les équations allométriques des principales formations forestières en Tunisie. Dans le cadre de cette étude, il a été demandé à l’Institut national de la recherche en génie rural, eaux et forêts d’élaborer des modèles allométriques qui permettront de prévoir et d’évaluer la quantité de biomasse et le carbone séquestré par les peuplements forestiers. Par ailleurs, les espèces forestières arborées qui caractérisent les formations forestières retenues seront considérées et leurs biomasses seront modélisées. -
DocumentManual / guideManuel de construction d’équations allométriques pour l’estimation du volume et la biomasse des arbres
De la mesure de terrain à la prédiction
2012
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Brochure, flyer, fact-sheetBrochureFood wastage footprint & Climate Change 2015
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No results found.The 2011 FAO assessment of global food losses and waste estimated that each year, one-third of all food produced in the world for human consumption never reached the consumer’s table. This not only means a missed opportunity for the economy and food security, but also a waste of all the natural resources used for growing, processing, packaging, transporting and marketing food. Through an extensive literature search, the 2011 assessment of food wastage volumes gathered weight ratios of food losse s and waste for different regions of the world, different commodity groups and different steps of the supply chain. These ratios were applied to regional food mass flows of FAO’s Food Balance Sheets for the year 2007. Food wastage arises at all stages of the food supply chains for a variety of reasons that are very much dependent on the local conditions within each country. At a global level, a pattern is clearly visible; in high income regions, volumes of wasted food are higher in the processin g, distribution and consumption stages, whereas in low-income countries, food losses occur in the production and postharvesting phases. -
Book (series)FlagshipThe State of World Fisheries and Aquaculture 2018 (SOFIA)
Meeting the sustainable development goals
2018The 2018 edition of The State of World Fisheries and Aquaculture emphasizes the sector’s role in achieving the 2030 Agenda for Sustainable Development and the Sustainable Development Goals, and measurement of progress towards these goals. It notes the particular contributions of inland and small-scale fisheries, and highlights the importance of rights-based governance for equitable and inclusive development. As in past editions, the publication begins with a global analysis of trends in fisheries and aquaculture production, stocks, processing and use, trade and consumption, based on the latest official statistics, along with a review of the status of the world’s fishing fleets and human engagement and governance in the sector. Topics explored in Parts 2 to 4 include aquatic biodiversity; the ecosystem approach to fisheries and to aquaculture; climate change impacts and responses; the sector’s contribution to food security and human nutrition; and issues related to international trade, consumer protection and sustainable value chains. Global developments in combating illegal, unreported and unregulated fishing, selected ocean pollution concerns and FAO’s efforts to improve capture fishery data are also discussed. The issue concludes with the outlook for the sector, including projections to 2030. As always, The State of World Fisheries and Aquaculture aims to provide objective, reliable and up-to-date information to a wide audience, including policy-makers, managers, scientists, stakeholders and indeed all those interested in the fisheries and aquaculture sector. -
Brochure, flyer, fact-sheetBrochureSustainable food systems: Concept and framework 2018
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No results found.The brief will be uploaded in the Sustainable Food Value Chain Knowledge Platform website http://www.fao.org/sustainable-food-value-chains/home/en/ and it will be distributed internally through ES Updates, the Sustainable Food Value Chain Technical Network and upcoming Sustainable Food Value Chain trainings in Suriname, Namibia, HQ and Egypt.