2020年8月CZU闪电综合体火灾对大盆地红木州立公园森林的影响

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-04-12 DOI:10.51492/cfwj.109.1

C. Potter

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引用次数: 0

摘要

CZU闪电综合体大火始于2020年8月16日，烧毁了加利福尼亚州圣克鲁斯县35000多公顷（80000英亩）的林地。在这项研究中，使用2020年火灾前后植被覆盖的陆地卫星图像，首次绘制了大盆地红木州立公园（BBRSP）及其周围CZU火灾景观的烧伤严重程度（低、中、高比例）模式。为了绘制活的再生林分与目前已经死亡的林分的地图，将10米分辨率哨兵卫星图像（CZU火灾后）得出的归一化差异植被指数（NDVI）的变化转化为一种新的评估指标，称为恢复再生绿色指数（RRGI）。2020年10月至2022年7月，Sentinel NDVI变化得出的RRGI结果显示，BBRSP中只有24%的被烧毁森林覆盖层仍然存在，并重新生长为中等水平的新绿色树冠覆盖层。2022年7月，BBRSP的实地调查显示，在CZU火灾发生两年后，没有达到RRGI等级3级或更高的树木，其大部分水平枝条上都长出了新的绿叶，这些树木不再存活并重新生长。CZU大火的空前强度，加上连续两年（2021年和2022年）的极端干旱和夏季高温，对BBRSP的大多数老树造成了严重破坏。

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Impacts of the CZU Lightning Complex Fire of August 2020 on the forests of Big Basin Redwoods State Park

The CZU Lightning Complex Fire started on 16 August 2020 and burned across more than 35,000 ha (80,000 acres) of forest lands in Santa Cruz County, California. In this study, Landsat satellite images of pre- and post-fire vegetation cover from 2020 were used to first map burn severity (low, moderate, high fraction) patterns on the CZU Fire landscape in and around Big Basin Redwoods State Park (BBRSP). For mapping of live regrowing versus currently dead forest stands, changes in the normalized difference vegetation index (NDVI) derived from 10-m resolution Sentinel satellite imagery (post-CZU Fire) were transformed into a new assessment metric called the Recovery-Regrowth-Green-Index (RRGI). The RRGI result derived from Sentinel NDVI change from October 2020 to July 2022 showed that just 24% of the burned forest cover in BBRSP was still alive and regrowing to a moderate level of new green canopy cover. Field surveys in BBRSP in July 2022 showed that trees not having attained a RRGI class level of 3 or greater, with sprouting of new green foliage on most of their horizontal limbs two years after the CZU Fire, were no longer alive and growing back. The unprecedented intensity of the CZU Fires together with two successive years (2021 and 2022) of extreme drought and summer heat has inflicted severe damage on the majority of old-growth trees in BBRSP.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.