基于卫星的时间序列土地覆盖和变化信息,用于绘制符合国家和国际报告要求的森林区域图

IF 3 2区 农林科学 Q1 FORESTRY Forestry Pub Date : 2020-05-14 DOI:10.1093/forestry/cpaa006
M. Wulder, T. Hermosilla, G. Stinson, F. Gougeon, Joanne C. White, D. A. Hill, B. Smiley
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引用次数: 21

摘要

森林是动态的生态系统,受到自然和人为因素变化的影响。野火、采伐和其他人类活动改变了森林中树木覆盖的面积。从国家和国际报告的角度来看,森林包括目前有树木的地区,以及目前没有树木的受干扰的森林地区,这些地区将有时间进行更新和推进自然演替过程。因此,可以在一个特定的时间点描绘森林面积,并根据回顾性的时间背景加以说明。利用陆地卫星图像的时间序列,可以根据过去干扰历史(如野火和收获)的知识生成年度土地覆盖图。在这项研究中,我们使用从Landsat时间序列中产生的30多年的年度土地覆盖数据来生成2010年加拿大森林面积的空间明确估计。我们展示了如何将土地覆盖和干扰信息结合起来,绘制出加拿大650公顷森林生态区内的“森林”面积图,这是联合国粮农组织(FAO)所定义的。根据这种方法,我们估计2010年加拿大的森林总面积为354.5 Mha。这一估计包括2010年324.5公顷的现有森林覆盖面积,加上额外的33.2公顷(或9.4%)由于火灾或采伐而暂时失去树木覆盖的临时通报森林面积,减去3.3公顷的面积,以满足连续森林面积的定义最小面积(0.5公顷)。使用加拿大国家森林清查作为独立参考来源,两种森林面积估计之间的空间一致性总体上约为84%。从空间上看,由landsat得出的2010年森林面积估计值与NFI基线估计值的总面积仅相差3%,在以湿地为主的哈德逊平原生态区存在显著的区域差异。卫星获得的时间序列土地覆盖和变化信息能够以可靠和透明的方式在空间上明确地描绘森林面积(不同于森林覆盖的表示),从而产生对科学、管理和报告信息需求有价值的信息。
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Satellite-based time series land cover and change information to map forest area consistent with national and international reporting requirements
Forests are dynamic ecosystems, subject to both natural and anthropogenic agents of change. Wildfire, harvesting and other human activities alter the tree-covered area present in forests. From national and international reporting perspectives, forests include areas currently treed, as well as those disturbed forest areas that are not currently treed but will be, given time for regeneration and the advancement of natural successional processes. As a consequence, forest area can be depicted at a particular point in time, informed by a retrospective temporal context. Using time series of Landsat imagery, annual land cover maps can be generated that are informed by knowledge of past disturbance history (such as wildfire and harvesting). In this research, we use over three decades of annual land cover data generated from Landsat time series to generate a spatially explicit estimate of the forest area of Canada in 2010. We demonstrate how land cover and disturbance information can be combined to map the area of ‘forest’, as defined by the Food and Agricultural Organization of the United Nations (FAO), within Canada’s 650 Mha of forested ecozones. Following this approach, we estimated Canada’s total forest area in 2010 to be 354.5 Mha. This estimate includes 324.5 Mha of current forest cover in 2010, plus an additional 33.2 Mha (or 9.4 per cent) of temporally informed forest area where tree cover had been temporarily lost due to fire or harvest, less 3.3 Mha that were removed to meet a definitional minimum size (0.5 ha) for contiguous forest area. Using Canada’s National Forest Inventory (NFI) as an independent reference source, the spatial agreement between the two estimates of forest area was ~84 per cent overall. Aspatially, the total area of the Landsat-derived estimate of 2010 forest area and the NFI baseline estimates differed by only 3 per cent, with notable regional differences in the wetland-dominated Hudson Plains Ecozone. Satellite-derived time series land cover and change information enable spatially explicit depictions of forest area (distinct from representations of forest cover) in a robust and transparent fashion, producing information of value to science, management and reporting information needs.
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来源期刊
Forestry
Forestry 农林科学-林学
CiteScore
6.70
自引率
7.10%
发文量
47
审稿时长
12-24 weeks
期刊介绍: The journal is inclusive of all subjects, geographical zones and study locations, including trees in urban environments, plantations and natural forests. We welcome papers that consider economic, environmental and social factors and, in particular, studies that take an integrated approach to sustainable management. In considering suitability for publication, attention is given to the originality of contributions and their likely impact on policy and practice, as well as their contribution to the development of knowledge. Special Issues - each year one edition of Forestry will be a Special Issue and will focus on one subject in detail; this will usually be by publication of the proceedings of an international meeting.
期刊最新文献
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