Spatial and Temporal Patterns of Fire on Saipan, CNMI

IF 0.7 4区 生物学 Q4 MARINE & FRESHWATER BIOLOGY
Pacific Science Pub Date : 2022-03-02 DOI:10.2984/76.1.1
Ilan E. Bubb, Z. Williams
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引用次数: 1

Abstract

Abstract: Sediment core studies from Saipan suggest that fires did not play a prominent role in the disturbance regime of the Mariana Islands and have increased in frequency since human settlement around 4,000 years ago. On Saipan fires are understood to interrupt the pattern of succession leading to the degradation of native limestone forests, the proliferation of grasslands and the eventual creation of badlands. Little baseline data regarding the spatial and temporal patterns of fire on Saipan exist to create effective Fire Management Plans. This project uses Landsat 8 images from April 2013 to July 2020 and the Normalized Burn Ratio to identify historic fires to evaluate patterns that will inform on effective fire management policies. Over the study period we detected 1,608 ha of burnt land, in four specific hotspots. Of the area burned, 40% were in grasslands, 31% in evergreen forests, and 21% in scrub-shrub. 41% of all hectares that burned more than once throughout the study period were grasslands, indicating that this was the landcover type most vulnerable to repeat burn events. We also found a strong seasonal trend, with the average amount of burnt land detected in the dry season 280% higher than the average amount of burnt land detected in the wet season. Finally, both total precipitation and the absence of precipitation were highly correlated to the amount of burn area identified (P < .05). The information elucidated through this study will be used by local agencies to implement management plans geared toward controlling wildfires.
塞班岛火灾的时空格局,CNMI
摘要:塞班岛沉积物岩心研究表明,火灾在马里亚纳群岛的扰动机制中没有发挥重要作用,自4000年前人类定居以来,火灾的频率有所增加。据了解,塞班岛的火灾中断了演替模式,导致原生石灰岩森林退化、草原泛滥,最终形成荒地。关于塞班岛火灾的空间和时间模式的基线数据很少,无法制定有效的火灾管理计划。该项目使用2013年4月至2020年7月的陆地卫星8号图像和归一化燃烧率来识别历史火灾,以评估模式,从而为有效的火灾管理政策提供信息。在研究期间,我们在四个特定的热点地区发现了1608公顷被烧毁的土地。在被烧毁的地区中,40%在草原,31%在常绿森林,21%在灌木林。在整个研究期间,超过一次被烧毁的所有公顷土地中,41%是草原,这表明这是最容易受到重复焚烧事件影响的土地覆盖类型。我们还发现了一个强烈的季节性趋势,旱季检测到的平均焚烧土地数量比雨季检测到的焚烧土地数量高280%。最后,总降水量和无降水量与确定的燃烧面积高度相关(P<.05)。通过这项研究阐明的信息将被地方机构用于实施旨在控制野火的管理计划。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Pacific Science
Pacific Science 生物-动物学
CiteScore
1.40
自引率
14.30%
发文量
17
审稿时长
3 months
期刊介绍: Pacific Science: A Quarterly Devoted to the Biological and Physical Sciences of the Pacific Region The official journal of the Pacific Science Association. Appearing quarterly since 1947, Pacific Science is an international, multidisciplinary journal reporting research on the biological and physical sciences of the Pacific basin. It focuses on biogeography, ecology, evolution, geology and volcanology, oceanography, paleontology, and systematics. In addition to publishing original research, the journal features review articles providing a synthesis of current knowledge.
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