Analysis of changes before and after forest fires with LAI, NDVI and ET time series: Focusing on major forest fires in Korea

IF 4.1 2区环境科学与生态学 Q1 ECOLOGY Ecological Engineering Pub Date : 2024-09-27 DOI:10.1016/j.ecoleng.2024.107412

Chulsang Yoo , Ki-Ho Chang , Munseok Lee , Sung-uk Song , Wooyoung Na , Jeong-Hyeok Ma

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Abstract

This study investigates the changes caused by forest fires and the following recovery processes, targeting four forest fire sites in Korea. The time series of two vegetation indices, leaf area index (LAI) and normalized difference vegetation index (NDVI) are investigated along with evapotranspiration (ET) time series for the study objectives. The analysis results show that LAI is most sensitive to burn severity and burned area with its change ranging from 40 % to 70 %, while the changes of NDVI and ET remain 30 % and 20 %, respectively, regardless of forest fire sites. The recovery time from forest fire also varies according to indices: the recovery time is estimated to be about 15 years when considering LAI and NDVI, while just 5 years when considering ET. Overall, LAI seems better to analyze the change in vegetation before and after forest fires. Different vegetation shift patterns after the forest fire are also noticed, mostly from evergreen needleleaf trees to deciduous broadleaf trees. However, it is also found that bad soil fertility condition and artificial afforestation help to maintain the evergreen needleleaf trees after the forest fire.

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利用 LAI、NDVI 和蒸散发时间序列分析森林火灾前后的变化：以韩国重大森林火灾为重点

本研究以韩国的四个森林火灾现场为对象，调查了森林火灾引起的变化以及随后的恢复过程。为实现研究目标，研究了叶面积指数（LAI）和归一化差异植被指数（NDVI）这两个植被指数的时间序列以及蒸散量（ET）时间序列。分析结果表明，叶面积指数对燃烧严重程度和燃烧面积最为敏感，其变化范围在 40% 至 70% 之间，而归一化差异植被指数和蒸散发指数的变化分别为 30% 和 20%，与森林火灾地点无关。森林火灾的恢复时间也因指数而异：考虑 LAI 和 NDVI 时，恢复时间估计约为 15 年，而考虑 ET 时，恢复时间仅为 5 年。总的来说，LAI 似乎更适合分析森林火灾前后植被的变化。人们还注意到森林火灾后植被的不同转变模式，主要是从常绿针叶树转变为落叶阔叶树。然而，研究还发现，土壤肥力条件差和人工造林有助于森林火灾后常绿针叶树的维持。

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来源期刊

Ecological Engineering 环境科学-工程：环境

CiteScore

8.00

自引率

5.30%

发文量

293

审稿时长

57 days

期刊介绍： Ecological engineering has been defined as the design of ecosystems for the mutual benefit of humans and nature. The journal is meant for ecologists who, because of their research interests or occupation, are involved in designing, monitoring, or restoring ecosystems, and can serve as a bridge between ecologists and engineers. Specific topics covered in the journal include: habitat reconstruction; ecotechnology; synthetic ecology; bioengineering; restoration ecology; ecology conservation; ecosystem rehabilitation; stream and river restoration; reclamation ecology; non-renewable resource conservation. Descriptions of specific applications of ecological engineering are acceptable only when situated within context of adding novelty to current research and emphasizing ecosystem restoration. We do not accept purely descriptive reports on ecosystem structures (such as vegetation surveys), purely physical assessment of materials that can be used for ecological restoration, small-model studies carried out in the laboratory or greenhouse with artificial (waste)water or crop studies, or case studies on conventional wastewater treatment and eutrophication that do not offer an ecosystem restoration approach within the paper.