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Trees, forests and land use in drylands: the first global assessment

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​FAO. 2019. Trees, forests and land use in drylands: the first global assessment –  Full report. FAO Forestry Paper No. 184. Rome.



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    Book (stand-alone)
    Trees, forests and land use in drylands 2016
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    Drylands cover about 41 percent of the Earth’s land surface and are home to 2 billion people, the majority of whom depend on forests and other wooded lands, grasslands and trees on farms for income and to meet basic needs. Yet surprising little is known about such ecosystems in drylands, despite widespread recognition of the need to restore drylands to cope with the effects of drought, desertification, land degradation and climate change. This document presents preliminary results of the first g lobal assessment of trees, forests and land use in drylands. It reports, among other things, that the global drylands contain 1.11 billion hectares of forest, which is more than one-quarter of the global forest area. There are also about 13.5 billion trees outside forests in drylands. More than 200 experts with knowledge of the land and land uses in specific dryland regions conducted the assessment, using freely available satellite imagery and a newly developed survey methodology. The pioneering study by FAO and many partners will be fully reported later in 2016.
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    Implications of forest definition for quantifying disturbance regime characteristics in Mediterranean forests
    XV World Forestry Congress, 2-6 May 2022
    2022
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    In the context of climate change and the increasing incidence of extreme events, global-scale assessments of forest disturbance regimes are needed to monitor changes, inform decision-making and adjust management and planning. But estimations of disturbance regime parameters can be strongly influenced by the criteria used for defining what constitutes a forest. Forests in Mediterranean regions are subject to increasingly higher pressure from climate change and anthropogenic factors. These pressures take the form of slow and diffuse degradation processes, such as drought-induced mortality and competition with shrubs, but also sudden stand- replacing disturbances, such as fire. Many Mediterranean forests, composed of widely spaced trees, are at the lower limit of the 10% canopy cover threshold set by the FAO for defining forests, while others are highly fragmented and mixed with a bushy matrix, qualifying them as other wooded lands. We thus expect assessments of forest disturbance regimes in the Mediterranean region to be particularly sensitive to the thresholds chosen. We assess the uncertainty linked to using different forest definitions for calculating disturbance rotation periods for the 40 ecoregions composing the Mediterranean biome. Using Google Earth Engine and remotely sensed data between 2000-2015, we apply different criteria for calculating the extent of forests and the areas disturbed within them, accounting for forest type, minimum size, canopy density and land use change. We identify the ecoregions with the disturbance rotation periods that are the most sensitive to these different definitions and compare the overall uncertainty with other major forest biomes. We conclude by discussing the importance of identifying harmonized definitions that can best support the sustainable management of Mediterranean forests, as well as opportunities for making consistent and accurate global baselines that can help improve projections of climate change impacts. Keywords: Forests, Disturbances, Remote Sensing, Planning, Climate Change ID: 3622233
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    Pilot assessment on global trends on tree cover, forest and land use 2016
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    This pioneering study by FAO and many partners presents preliminary results of the first pilot global assessment of trees, forest and land use in the world at global and continent level. More than 500 experts with knowledge of the land and land uses in specific regions conducted the assessment, using freely available satellite imagery and a newly developed survey methodology.

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