加拿大西部和中部亚北极地区近50年来没有Treeline进展和遥感数据中的植被错误分类问题

IF 1.3 4区 环境科学与生态学 Q3 ECOLOGY
K. Timoney, S. Mamet
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引用次数: 11

摘要

摘要在本研究中,我们考察了(1)在加拿大西部和中部960000平方公里的亚北极研究区域,1960-2010年期间是否发生了显著的树木覆盖变化;以及(2)全球森林变化(GFC)树木覆盖数据与其他数据集的一致程度。我们比较了GFC树木覆盖率与来自航空照片(约1960年)、地面地块数据(约1982-84年)、带注释的低层倾斜照片(约2005-09年)和世界图像底图上的航空照片足迹(约2010年)的覆盖率估计值。自1960年以来,树木覆盖率的变化因地理和生态区域而异。根据地区的不同,造林从适度到不显著。我们没有观察到树木向北迁移的证据。被烧毁的森林面积的增加,主要发生在森林苔原以南的地区,是检测到的最大变化。我们记录了树木覆盖率估计值和GFC数据之间的系统性差异。GFC对树木覆盖率的低估通常发生在树木密度低的地区。GFC数据高估树木覆盖率的地区很常见,尤其是在树木的北部边界附近以及以茂密或高大灌木为主的地区。仅从遥感数据中预测气候驱动的植被响应可能不可靠。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
No Treeline Advance Over the Last 50 Years in Subarctic Western and Central Canada and the Problem of Vegetation Misclassification in Remotely Sensed Data
ABSTRACT In this study we examined (1) whether there has been significant tree cover change over the period 1960–2010 in a 960,000 km2 subarctic study region in western and central Canada, and (2) the degree to which Global Forest Change (GFC) tree cover data agree with other datasets. We compared GFC tree cover to cover estimates from air photos (c. 1960), ground-level plot data (c. 1982–84), annotated low-level oblique photographs (c. 2005–09), and air photo footprints on the World Imagery Base Map (c. 2010). Tree cover changes since 1960 varied by physiographic and ecological regions. Afforestation was modest to non-significant depending on the region. We observed no evidence of northward tree migration. An increase in the areal extent of burned forests, mostly in areas south of the forest-tundra, was the largest change detected. We documented systematic discrepancies between our tree cover estimates and GFC data. GFC underestimates of tree cover typically occurred in areas of low tree density. Areas where GFC data overestimated tree cover were common, especially near the northern limits of trees and in areas dominated by dense or tall shrubs. Predictions of climate-driven vegetation response derived solely from remotely sensed data may not be reliable.
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来源期刊
Ecoscience
Ecoscience 环境科学-生态学
CiteScore
2.80
自引率
0.00%
发文量
13
审稿时长
>36 weeks
期刊介绍: Écoscience, is a multidisciplinary journal that covers all aspects of ecology. The journal welcomes submissions in English or French and publishes original work focusing on patterns and processes at various temporal and spatial scales across different levels of biological organization. Articles include original research, brief communications and reviews.
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