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Plant-plant interactions influence post-fire recovery depending on fire history and nurse growth form 植物与植物之间的相互作用会影响火灾后的恢复,这取决于火灾历史和哺育植物的生长形式
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-01-26 DOI: 10.1186/s42408-024-00246-2
Maral Bashirzadeh, Mehdi Abedi, Mohammad Farzam
Plant-plant interactions are among the most important factors affecting the natural recovery of vegetation. While the impacts of nurse plants on species composition and biodiversity are well documented, the effects of different nurse’s growth forms on all biodiversity components including taxonomic, functional, and phylogenetic diversity have been less studied and compared, especially for their effects on different times after fire disturbance. This research was focused on comparing the effects of a perennial grass (Elymus hispidens), a perennial herb (Phlomis cancellata), and a high shrub species (Lonicera nummulariifolia) on species composition and the biodiversity components, and how these impacts change across five sites with short-term (1 and 4 years sites), long-term (10 and 20 years sites) times since last fire and a control site where no fire was known in recorded history in semi-arid shrublands of Fereizi Chenaran located in Northeast of Iran. The changes of species composition and taxonomic, functional, and phylogenetic diversity were calculated with respect to the presence/absence of nurse’s growth forms, fire history, and their interactions. Nurse shrubs affected species composition and all biodiversity components, whereas all indices were reduced when considering Elymus grass as nurse plant. On the other hand, the herb Phlomis enhanced species composition and taxonomic diversity, while it had a negative effect on functional and phylogenetic diversity. Such specific effects of nurse types were mostly observed under long timescales (i.e., 10- and 20-year sites). Interestingly, the relative importance of nurse types and time since the last fire largely explained the variation of species composition and biodiversity components, with larger effects of nurse types on all biodiversity components. However, we found a significant contribution of fire explaining variation of species composition and phylogenetic diversity. These results indicated nurse plants can affect the post-fire recovery of vegetation by providing specific mechanisms controlling beneficiary relatedness depending on their growth forms and time scales since the last fire. Therefore, these findings suggest perennial plants in the form of nurse species as a useful factor to develop techniques of active restoration in burned ecosystems.
植物与植物之间的相互作用是影响植被自然恢复的最重要因素之一。虽然护生植物对物种组成和生物多样性的影响已被充分记录,但不同护生植物的生长形式对所有生物多样性组成部分(包括分类、功能和系统发育多样性)的影响的研究和比较却较少,尤其是它们对火灾干扰后不同时期的影响。这项研究的重点是比较一种多年生草(Elymus hispidens)、一种多年生草本植物(Phlomis cancellata)和一种高灌木物种(Lonicera nummulariifolia)对物种组成和生物多样性组成部分的影响、在位于伊朗东北部的 Fereizi Chenaran 半干旱灌木林地中,研究了自上次火灾后短期(1 年和 4 年)、长期(10 年和 20 年)和有记录以来未发生过火灾的对照地点对物种组成和生物多样性组成部分的影响,以及这些影响在五个地点的变化情况。计算了物种组成的变化以及分类学、功能和系统发育多样性与有/无护林生长形式、火灾历史及其相互作用的关系。护生灌木影响了物种组成和所有生物多样性成分,而将酢浆草作为护生植物时,所有指数都有所降低。另一方面,草本植物 Phlomis 增强了物种组成和分类多样性,但对功能和系统发育多样性有负面影响。在长时间尺度下(即 10 年和 20 年的地点),主要观察到了哺育类型的这种特定影响。有趣的是,哺育类型的相对重要性和上次火灾后的时间在很大程度上解释了物种组成和生物多样性成分的变化,哺育类型对所有生物多样性成分的影响都较大。然而,我们发现火灾在解释物种组成和系统发育多样性的变化方面具有重要作用。这些结果表明,哺乳类植物可根据其生长形式和上次火灾后的时间尺度,通过控制受益亲缘关系的特定机制来影响火灾后植被的恢复。因此,这些研究结果表明,多年生植物是发展烧毁生态系统积极恢复技术的一个有用因素。
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引用次数: 0
Shapley-based interpretation of deep learning models for wildfire spread rate prediction 基于 Shapley 的深度学习模型对野火蔓延率预测的解释
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-01-25 DOI: 10.1186/s42408-023-00242-y
Faiza Qayyum, Nagwan Abdel Samee, Maali Alabdulhafith, Ahmed Aziz, Mohammad Hijjawi
Predicting wildfire progression is vital for countering its detrimental effects. While numerous studies over the years have delved into forecasting various elements of wildfires, many of these complex models are perceived as “black boxes”, making it challenging to produce transparent and easily interpretable outputs. Evaluating such models necessitates a thorough understanding of multiple pivotal factors that influence their performance. This study introduces a deep learning methodology based on transformer to determine wildfire susceptibility. To elucidate the connection between predictor variables and the model across diverse parameters, we employ SHapley Additive exPlanations (SHAP) for a detailed analysis. The model’s predictive robustness is further bolstered through various cross-validation techniques. Upon examining various wildfire spread rate prediction models, transformer stands out, outperforming its peers in terms of accuracy and reliability. Although the models demonstrated a high level of accuracy when applied to the development dataset, their performance deteriorated when evaluated against the separate evaluation dataset. Interestingly, certain models that showed the lowest errors during the development stage exhibited the highest errors in the subsequent evaluation phase. In addition, SHAP outcomes underscore the invaluable role of explainable AI in enriching our comprehension of wildfire spread rate prediction.
预测野火的发展对消除其有害影响至关重要。虽然多年来已有大量研究对野火的各种因素进行了预测,但其中许多复杂的模型都被视为 "黑盒子",难以产生透明且易于解释的输出结果。要评估这些模型,就必须彻底了解影响其性能的多个关键因素。本研究介绍了一种基于变压器的深度学习方法,用于确定野火易感性。为了阐明预测变量与不同参数模型之间的联系,我们采用了 SHapley Additive exPlanations(SHAP)进行详细分析。通过各种交叉验证技术,进一步增强了模型的预测稳健性。在对各种野火蔓延率预测模型进行检查后,变压器脱颖而出,在准确性和可靠性方面均优于同类模型。虽然这些模型在应用于开发数据集时表现出了很高的准确性,但在针对单独的评估数据集进行评估时,其性能却有所下降。有趣的是,某些在开发阶段误差最小的模型,在随后的评估阶段却表现出最高的误差。此外,SHAP 的结果还强调了可解释人工智能在丰富我们对野火蔓延率预测的理解方面所起的宝贵作用。
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引用次数: 0
Cellular automata-based simulators for the design of prescribed fire plans: the case study of Liguria, Italy 基于细胞自动机的模拟器用于设计规定火灾计划:意大利利古里亚案例研究
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-01-22 DOI: 10.1186/s42408-023-00239-7
Nicoló Perello, Andrea Trucchia, Francesco Baghino, Bushra Sanira Asif, Lola Palmieri, Nicola Rebora, Paolo Fiorucci
Socio-economic changes in recent decades have resulted in an accumulation of fuel within Mediterranean forests, creating conditions conducive to potential catastrophic wildfires intensified by climate change. Consequently, several wildfire management systems have integrated prescribed fires as a proactive strategy for land management and wildfire risk reduction. The preparation of prescribed fires involves meticulous planning, entailing the identification of specific objectives, verification of prescriptions, and the definition of various scenarios. During the planning phase, simulation models offer a valuable decision-support tool for the qualitative and quantitative assessment of different scenarios. In this study, we harnessed the capabilities of the well-established wildfire simulation tool PROPAGATOR, to identify areas where prescribed fires can be performed, optimizing the wildfire risk mitigation and the costs. We selected a case study in the Liguria region, Italy, where the model is utilized operationally by the regional wildfire risk management system in emergency situations. Initially, we employed the propagation model to simulate a historical wildfire event, showcasing its potential as an emergency response tool. We focused on the most significant fire incident that occurred in the Liguria region in 2022. Subsequently, we employed PROPAGATOR to identify optimal areas for prescribed fires with the dual objectives of maximizing the mitigation of wildfire risk and minimizing treatment costs. The delineation of potential areas for prescribed fires has been established in accordance with regional regulations and expert-based insights. The methodology put forth in this study is capable of discerning the most suitable areas for the implementation of prescribed burns from a preselected set. A Monte Carlo simulation framework was employed to evaluate the efficacy of prescribed burns in mitigating the spread of wildfires. This assessment accounted for a variety of conditions, including fuel loads, ignition points, and meteorological patterns. The PROPAGATOR model was utilized to simulate the progression of wildfire spread. This study underscores the utility of PROPAGATOR in offering both quantitative and qualitative insights that can inform prescribed fire planning. Our methodology has been designed to involve active engagement with subject matter experts throughout the process, to develop scenarios grounded in their expert opinions. The ability to assess diverse scenarios and acquire quantitative information empowers decision-makers to make informed choices, thereby advancing safer and more efficient fire management practices.
近几十年来的社会经济变化导致地中海森林中的燃料不断积累,为气候变化可能加剧的灾难性野火创造了有利条件。因此,一些野火管理系统已将预设火灾作为一种积极的土地管理和降低野火风险的策略。预设火灾的准备工作涉及周密的规划,包括确定具体目标、验证预设方案和定义各种情景。在规划阶段,模拟模型为定性和定量评估不同方案提供了宝贵的决策支持工具。在这项研究中,我们利用了成熟的野火模拟工具 PROPAGATOR 的功能,以确定可以进行规定火灾的区域,优化野火风险缓解和成本。我们选择了意大利利古里亚地区的一个案例进行研究,该地区的野火风险管理系统在紧急情况下使用了该模型。最初,我们利用传播模型模拟了一次历史野火事件,展示了其作为应急工具的潜力。我们重点研究了 2022 年发生在利古里亚地区的最重大火灾事件。随后,我们利用 PROPAGATOR 确定了最佳预设火灾区域,以实现最大限度降低野火风险和最小化处理成本的双重目标。根据地区法规和专家的见解,划定了可能进行明火的区域。本研究提出的方法能够从预先选定的区域中找出最适合实施规定燃烧的区域。采用蒙特卡洛模拟框架来评估规定烧荒在缓解野火蔓延方面的功效。该评估考虑了各种条件,包括燃料负荷、着火点和气象模式。PROPAGATOR 模型用于模拟野火蔓延的过程。这项研究强调了 PROPAGATOR 在定量和定性分析方面的实用性,可以为规定火灾规划提供参考。我们的方法旨在让主题专家积极参与整个过程,并根据他们的专业意见制定方案。评估不同情景和获取定量信息的能力使决策者能够做出明智的选择,从而推动更安全、更高效的火灾管理实践。
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引用次数: 0
Air quality and health impacts of the 2020 wildfires in California 2020 年加州野火对空气质量和健康的影响
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-01-19 DOI: 10.1186/s42408-023-00234-y
Marc Carreras-Sospedra, Shupeng Zhu, Michael MacKinnon, William Lassman, Jeffrey D. Mirocha, Michele Barbato, Donald Dabdub
Wildfires in 2020 ravaged California to set the annual record of area burned to date. Clusters of wildfires in Northern California surrounded the Bay Area covering the skies with smoke and raising the air pollutant concentrations to hazardous levels. This study uses the Fire Inventory from the National Center for Atmospheric Research database and the Community Multiscale Air Quality model to estimate the effects of wildfire emissions on air quality during the period from August 16 to October 28 of 2020. In addition, low-cost sensor data for fine particulate matter (PM2.5) from the PurpleAir network is used to enhance modeled PM2.5 concentrations. The resulting impacts on ozone and PM2.5 are used to quantify the health impacts caused by wildfires using the Benefits Mapping and Analysis Program – Community Edition. Wildfire activity significantly increased direct PM2.5 emissions and emissions of PM2.5 and ozone precursors. Direct PM2.5 emissions surged up to 38 times compared to an average day. Modeling results indicated that wildfires alone led to a rise in ozone daily maximum 8-h average by up to 10 ppb and exceeded PM2.5 air quality standards in numerous locations by up to 10 times. While modeled PM2.5 concentrations were lower than measurements, correcting these with PurpleAir data improved the accuracy. The correction using PurpleAir data increased estimates of wildfire-induced mortality due to PM2.5 exposure by up to 16%. The increased hospital admissions and premature mortality attributed to wildfires were found to be comparable to the health impacts avoided by strategies aimed at meeting ozone and PM2.5 air quality standards. This suggests that widespread wildfire emissions can negate years of efforts dedicated to controlling air pollution. The integration of low-cost sensor data proved invaluable in refining the estimates of health impacts from PM2.5 resulting from wildfires.
2020 年的野火肆虐加州,创下了迄今为止的年度烧毁面积纪录。北加州的野火群包围了海湾地区,浓烟遮天蔽日,空气污染物浓度上升到危险水平。本研究利用美国国家大气研究中心数据库的火灾清单和社区多尺度空气质量模型,估算了 2020 年 8 月 16 日至 10 月 28 日期间野火排放对空气质量的影响。此外,来自 PurpleAir 网络的低成本细颗粒物(PM2.5)传感器数据也用于提高模型中 PM2.5 的浓度。由此产生的对臭氧和 PM2.5 的影响被用于使用 "效益绘图和分析程序--社区版 "对野火造成的健康影响进行量化。野火活动大大增加了 PM2.5 的直接排放量以及 PM2.5 和臭氧前体物的排放量。与平日相比,PM2.5 的直接排放量激增了 38 倍。建模结果表明,仅野火就导致臭氧日最大 8 小时平均值上升达 10 ppb,许多地方的 PM2.5 空气质量超标达 10 倍。虽然模拟的 PM2.5 浓度低于测量值,但使用 PurpleAir 数据进行校正后,精度有所提高。使用 PurpleAir 数据进行修正后,PM2.5 暴露导致的野火诱发死亡率估计值增加了 16%。研究发现,野火导致的入院人数和过早死亡率的增加与旨在达到臭氧和 PM2.5 空气质量标准的策略所避免的健康影响相当。这表明,大范围的野火排放会抵消多年来为控制空气污染所做的努力。事实证明,低成本传感器数据的整合对于完善野火造成的 PM2.5 健康影响的估算非常有价值。
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引用次数: 0
Correction: Fire severity influences large wood and stream ecosystem responses in western Oregon watersheds 更正:火灾严重程度影响俄勒冈州西部流域的大型木材和溪流生态系统响应
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-01-18 DOI: 10.1186/s42408-023-00240-0
Ashley A. Coble, Brooke E. Penaluna, Laura J. Six, Jake Verschuyl
<p><b>Correction: Fire Ecol 19, 34 (2023)</b></p><p><b>https://doi.org/10.1186/s42408-023–00192-5</b></p><p>When analysing subsequent years of fish and amphibian data, the authors identified an error in some of the reach area calculations that affected vertebrate densities for some sites (density and biomass density for fish and amphibians). Specifically, the formula for reach area in some cells (5 sites) referenced wetted width from an adjacent site instead of the correct site. Because this error did not occur across all cells (sites) and because abundance data were not affected this calculation error was not readily apparent. This error affected densities for fish and amphibians at some sites, including 2 of the most severely burned sites, and therefore affects the individual fish and amphibian responses reported in Fig. 7 a, b. For consistency, Fig. 5 (PCA) has also been updated to reflect these changes.</p><figure><figcaption><b data-test="figure-caption-text">Fig. 5</b></figcaption><picture><source srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs42408-023-00240-0/MediaObjects/42408_2023_240_Fig1_HTML.png?as=webp" type="image/webp"/><img alt="figure 1" aria-describedby="Fig1" height="1604" loading="lazy" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs42408-023-00240-0/MediaObjects/42408_2023_240_Fig1_HTML.png" width="685"/></picture><p>Principal components analysis (PCA) and relationships of axes with fire severity and pre-fire stand age. <b>a</b> PCA with scores and loadings of physical, chemical, biological, and watershed characteristics. <b>b</b> Principal component 1 (PC1) varied as a function of fire severity as RAVG mean. <b>c</b> Principal component 2 (PC2) varied as a function of pre-fire stand age</p><span>Full size image</span><svg aria-hidden="true" focusable="false" height="16" role="img" width="16"><use xlink:href="#icon-eds-i-chevron-right-small" xmlns:xlink="http://www.w3.org/1999/xlink"></use></svg></figure><p>This correction affects only the fish and amphibian density and biomass density results (Fig. 5, Fig. 7 panel a and b), with minimal edits to the text. However, this small adjustment does not affect the overall conclusions or interpretation of the article, which focuses on the response of in-stream large wood and riparian coarse wood to wildfire.</p><figure><figcaption><b data-test="figure-caption-text">Fig. 7</b></figcaption><picture><source srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs42408-023-00240-0/MediaObjects/42408_2023_240_Fig2_HTML.png?as=webp" type="image/webp"/><img alt="figure 2" aria-describedby="Fig2" height="551" loading="lazy" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs42408-023-00240-0/MediaObjects/42408_2023_240_Fig2_HTML.png" width="685"/></picture><p>Biological responses that varied as a function of fire severity (RAVG). Biological responses included: <b>a</b> fish densit
图 5b;附加文件 2)火灾严重程度是 PC1 的一个重要预测因子,它表明火灾越严重的流域,其树木死亡率、挽救性采伐、光照可用性、 DOC、DON、NH4+、鱼类密度和溪流温度越高,树冠覆盖率、敏感和不耐受大型无脊椎动物类群、刮削器百分比以及溪流和河岸地区的小直径木材越低(图 5b;附加文件 2)。第五段我们假设溪流生物群会对暴露于更严重火灾的溪流做出负面反应,我们的结果与一些顶级捕食者的假设一致。在顶级捕食者(鱼类或两栖动物)中,我们发现只有鱼类密度和鱼类生物量密度随火灾严重程度和火灾前林木年龄而变化,而两栖动物密度和两栖动物生物量密度则不随任何预测因子而变化(图 5)。我们观察到鱼类密度与火灾严重程度、火灾前林龄以及它们各自的主效应之间存在明显的交互作用。鱼类生物量密度随火灾严重程度而变化,但不随火灾前林龄或它们之间的交互作用而变化。我们的假设是,溪流生物群会对遭受严重火灾的溪流做出负面反应,我们的结果与两栖动物的假设一致,但与鱼类的假设不一致。两栖动物的密度随火灾严重程度和火灾前林木年龄的变化而变化,而鱼类的密度则随火灾严重程度的变化而变化。鱼类生物量密度和两栖动物生物量密度不随任何预测因子的变化而变化(图 5)。我们没有观察到两栖动物密度与火灾严重程度和火灾前林木年龄之间存在明显的交互作用,但它们各自的主效应都很明显,在烧毁程度较轻的流域和火灾前林木年龄较大的地区,两栖动物密度较大。火灾严重程度和火灾前林木年龄对水生生态系统的影响 第一段在火灾严重程度较高的流域,上层林木死亡率、光照可用性、DOM 浓度、抢救性砍伐和溪流温度都有所上升,而树冠覆盖率、LW 直径、DOM 浓度和溪流温度都有所下降、敏感和不耐受大型无脊椎动物类群、刮食者功能摄食群、鱼类密度和鱼类生物量密度降低在燃烧严重程度较高的流域,上层树木死亡率、光照可用性、DOM 浓度、抢救性采伐、溪流温度和鱼类密度增加,而树冠覆盖率、LW 直径、鱼类生物量密度和鱼类生物量密度降低、火灾严重程度和火灾前林木年龄对水生生态系统的影响 第 6 段 我们发现,在整个研究区域内,火灾较严重的流域的鱼类密度和生物量密度都有所下降、这些变化可能共同导致了鱼类密度和鱼类生物量密度的下降。尽管在我们的研究中观察到了直接的下降,但预计这些本地种群将很快恢复(Rieman 和 Clayton,1997 年;Dunham 等人,2003 年;Rieman 等人,2012 年;Gomez Isaza 等人,2022 年)。尽管在我们的研究中观察到的捕食者反应不一,但预计这些本地种群将很快恢复(Rieman 和 Clayton,1997 年;Dunham 等,2003 年;Rieman 等,2012 年;Gomez Isaza 等,2022 年)。结论在喀斯喀特西部特大火灾后的最初 8 到 11 个月内,我们发现更严重的火灾烧毁了更多的上层河岸植被,导致光照、DOM 浓度和大型无脊椎动物密度增加,同时降低了树冠覆盖率、LW 直径、大型无脊椎动物多样性以及鱼类密度、在西卡斯卡特大火灾后的最初 8 到 11 个月内,我们发现更严重的火灾烧毁了更多的上层河岸植被,导致光照、DOM 浓度、大型无脊椎动物和鱼类密度增加,同时树冠覆盖率、LW 直径、大型无脊椎动物多样性和两栖动物密度降低附加文件 5 生物变量与火灾前林木年龄(y)的函数关系。变量包括:a) 无灰干质量(g m-2);b) 采集器-滤网(%);c) 碎纸机(%);d) EPT(%);e) 两栖动物密度(no. 生物变量与火灾前林龄(y)和火灾严重程度(RAVG)的函数关系。变量包括:a) 无灰干质量(克 m-2);b) 采集器-滤器(%);c) 碎纸机(%);d) EPT(%);e) 鱼类生物量密度(克 m-2);f) 两栖动物生物量密度(克 m-2)Coble, A.A., Penaluna, B.E., Six, L.J. et al. 火灾严重程度影响俄勒冈州西部流域的大型木材和溪流生态系统响应。Fire Ecol 19, 34 (2023). https://doi.org/10.1186/s42408-023-00192-5.Download 参考文献作者及单位NCASI, 2438 NW Professional Drive, Corvallis, OR, 97330, USAAshley A. CobleU.S.D.A. Forest Service, Pacific Northwest Research Station, 3200 SW Jefferson Way, Corvallis, OR, 97331, USABrooke E.PenalunaWeyerhaeuser Company, 505 N Pearl St, Centralia, WA, 98531, USALaura J. SixNCASI, 1117 3Rd Street, Anacortes, WA, 98221, USAJake VerschuylAuthorsAshley A. CobleView author publications您也可以在PubMed Google Scholar中搜索该作者Brooke E. PenalunaView author publications您也可以在PubMed Google Scholar中搜索该作者Laura J. Six查看作者发表的文章Six查看作者发表的文章您也可以在PubMed Google Scholar中搜索该作者Jake Verschuyl查看作者发表的文章您也可以在PubMed Google Scholar中搜索该作者通信作者Ashley A. Coble.开放存取本文采用知识共享署名 4.0 国际许可协议进行许可,该协议允许以任何媒介或格式使用、共享、改编、分发和复制,只要您适当注明原作者和来源,提供知识共享许可协议的链接,并注明是否进行了修改。本文中的图片或其他第三方材料均包含在文章的知识共享许可协议中,除非在材料的署名栏中另有说明。如果材料未包含在文章的知识共享许可协议中,且您打算使用的材料不符合法律规定或超出许可使用范围,您需要直接从版权所有者处获得许可。要查看该许可的副本,请访问 http://creativecommons.org/licenses/by/4.0/.Reprints and permissionsCite this articleCoble, A.A., Penaluna, B.E., Six, L.J. et al. Correction:Fire Ecol 20, 5 (2024). https://doi.org/10.1186/s42408-023-00240-0Download citationPublished: 18 January 2024DOI: https://doi.org/10.1186/s42408-023-00240-0Share this articleAnyone you share the following link with will be able to read this cont
{"title":"Correction: Fire severity influences large wood and stream ecosystem responses in western Oregon watersheds","authors":"Ashley A. Coble, Brooke E. Penaluna, Laura J. Six, Jake Verschuyl","doi":"10.1186/s42408-023-00240-0","DOIUrl":"https://doi.org/10.1186/s42408-023-00240-0","url":null,"abstract":"&lt;p&gt;&lt;b&gt;Correction: Fire Ecol 19, 34 (2023)&lt;/b&gt;&lt;/p&gt;&lt;p&gt;&lt;b&gt;https://doi.org/10.1186/s42408-023–00192-5&lt;/b&gt;&lt;/p&gt;&lt;p&gt;When analysing subsequent years of fish and amphibian data, the authors identified an error in some of the reach area calculations that affected vertebrate densities for some sites (density and biomass density for fish and amphibians). Specifically, the formula for reach area in some cells (5 sites) referenced wetted width from an adjacent site instead of the correct site. Because this error did not occur across all cells (sites) and because abundance data were not affected this calculation error was not readily apparent. This error affected densities for fish and amphibians at some sites, including 2 of the most severely burned sites, and therefore affects the individual fish and amphibian responses reported in Fig. 7 a, b. For consistency, Fig. 5 (PCA) has also been updated to reflect these changes.&lt;/p&gt;&lt;figure&gt;&lt;figcaption&gt;&lt;b data-test=\"figure-caption-text\"&gt;Fig. 5&lt;/b&gt;&lt;/figcaption&gt;&lt;picture&gt;&lt;source srcset=\"//media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs42408-023-00240-0/MediaObjects/42408_2023_240_Fig1_HTML.png?as=webp\" type=\"image/webp\"/&gt;&lt;img alt=\"figure 1\" aria-describedby=\"Fig1\" height=\"1604\" loading=\"lazy\" src=\"//media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs42408-023-00240-0/MediaObjects/42408_2023_240_Fig1_HTML.png\" width=\"685\"/&gt;&lt;/picture&gt;&lt;p&gt;Principal components analysis (PCA) and relationships of axes with fire severity and pre-fire stand age. &lt;b&gt;a&lt;/b&gt; PCA with scores and loadings of physical, chemical, biological, and watershed characteristics. &lt;b&gt;b&lt;/b&gt; Principal component 1 (PC1) varied as a function of fire severity as RAVG mean. &lt;b&gt;c&lt;/b&gt; Principal component 2 (PC2) varied as a function of pre-fire stand age&lt;/p&gt;&lt;span&gt;Full size image&lt;/span&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"16\" role=\"img\" width=\"16\"&gt;&lt;use xlink:href=\"#icon-eds-i-chevron-right-small\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;/use&gt;&lt;/svg&gt;&lt;/figure&gt;&lt;p&gt;This correction affects only the fish and amphibian density and biomass density results (Fig. 5, Fig. 7 panel a and b), with minimal edits to the text. However, this small adjustment does not affect the overall conclusions or interpretation of the article, which focuses on the response of in-stream large wood and riparian coarse wood to wildfire.&lt;/p&gt;&lt;figure&gt;&lt;figcaption&gt;&lt;b data-test=\"figure-caption-text\"&gt;Fig. 7&lt;/b&gt;&lt;/figcaption&gt;&lt;picture&gt;&lt;source srcset=\"//media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs42408-023-00240-0/MediaObjects/42408_2023_240_Fig2_HTML.png?as=webp\" type=\"image/webp\"/&gt;&lt;img alt=\"figure 2\" aria-describedby=\"Fig2\" height=\"551\" loading=\"lazy\" src=\"//media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs42408-023-00240-0/MediaObjects/42408_2023_240_Fig2_HTML.png\" width=\"685\"/&gt;&lt;/picture&gt;&lt;p&gt;Biological responses that varied as a function of fire severity (RAVG). Biological responses included: &lt;b&gt;a&lt;/b&gt; fish densit","PeriodicalId":12273,"journal":{"name":"Fire Ecology","volume":"4 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139496593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prescribed burning mitigates the severity of subsequent wildfires in Mediterranean shrublands 有规定的焚烧可减轻地中海灌木林后续野火的严重程度
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-01-17 DOI: 10.1186/s42408-023-00233-z
José Manuel Fernández-Guisuraga, Paulo M. Fernandes
Prescribed burning (PB) is becoming relevant in fuel reduction and thus fire hazard abatement in fire-prone ecosystems of southern Europe. Yet, empirical evidence on the effectiveness of this practice to mitigate wildfire severity in Mediterranean shrublands is non-existent, despite being the focus of PB efforts in this region. Here, we intended to quantify the protective effect of PB treatment units (2005–2021) to subsequent wildfire severity in shrublands across mainland Portugal, as well as the relative contribution and complex interactions between drivers of wildfire severity in PB-treated areas and untreated neighboring counterparts through Random Forest regression. We leveraged cloud-computing remote sensing data processing in Google Earth Engine to estimate fire severity (PB and wildfire) as the Relativized Burn Ratio (RBR) using Landsat data catalog. PB treatment was particularly effective at mitigating wildfire severity at the first PB-wildfire encounter in shrublands, with a mean reduction of around 24% in RBR units. Fuel age (i.e., time since prescribed burning) in PB-wildfire intersection areas overwhelmed to a large extent the effect of fire weather, burning probability, and PB severity. The mitigating effect of PB on wildfire severity persisted for a fuel age of around 5 years. However, this effect decreased with increasingly adverse fire weather conditions, such that variation in wildfire severity was somewhat insensitive to fuel age under extreme fire weather. Similarly, the lowest wildfire severity experienced in sites with high burning probability, along with the interaction effect observed between burning probability and fuel age, suggest that repeated PB treatments may be useful in controlling fuel accumulation and mitigating wildfire severity. The relative contribution of fire weather in explaining wildfire severity was exceedingly high in untreated areas, doubling that of the other variables in the model in the absence of PB treatment variables. Our results suggest that the implementation of PB treatments at intervals of less than 5 years is of paramount importance to control fuel build-up and fire hazard under extreme fire weather in productive Mediterranean shrublands. Further research on this topic is warranted in other shrublands worldwide, namely in Mediterranean-type climate regions.
在南欧易发生火灾的生态系统中,规定焚烧(PB)在减少燃料从而降低火灾危害方面正变得越来越重要。然而,尽管规定焚烧是地中海灌木林地的工作重点,但有关这种做法在减轻该地区野火严重程度方面的有效性的经验证据却并不存在。在此,我们打算通过随机森林回归法量化灌木林处理单元(2005-2021 年)对葡萄牙大陆灌木林地随后野火严重程度的保护作用,以及灌木林处理地区和未处理邻近地区野火严重程度驱动因素的相对贡献和复杂相互作用。我们利用谷歌地球引擎中的云计算遥感数据处理功能,使用 Landsat 数据目录以相对燃烧比(RBR)估算火灾严重程度(PB 和野火)。在灌木林地中,PB 处理对减轻首次 PB 与野火相遇时的野火严重程度尤为有效,RBR 单位的平均降幅约为 24%。PB-野火交汇区的燃料年龄(即规定燃烧后的时间)在很大程度上抵消了火灾天气、燃烧概率和 PB 严重程度的影响。预烧对野火严重程度的缓解作用在燃料年龄为 5 年左右时仍然存在。然而,随着火灾天气条件越来越恶劣,这种影响也随之减弱,因此在极端火灾天气下,野火严重程度的变化对燃料年限并不敏感。同样,燃烧概率高的地点野火严重程度最低,而且燃烧概率与燃料年龄之间存在交互作用,这表明重复的 PB 处理可能有助于控制燃料积累和减轻野火严重程度。在未处理地区,火灾天气在解释野火严重性方面的相对贡献率非常高,在没有 PB 处理变量的情况下,其贡献率是模型中其他变量的两倍。我们的研究结果表明,在地中海高产灌木林地的极端火灾天气条件下,间隔少于 5 年实施 PB 处理对控制燃料堆积和火灾危害至关重要。有必要在全球其他灌木林地,即地中海型气候地区进一步开展这方面的研究。
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引用次数: 0
Human influence on late Holocene fire history in a mixed-conifer forest, Sierra National Forest, California 人类对加利福尼亚塞拉利昂国家森林针阔混交林全新世晚期火灾历史的影响
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-01-15 DOI: 10.1186/s42408-023-00245-9
Anna Klimaszewski-Patterson, Theodore Dingemans, Christopher T. Morgan, Scott A. Mensing
Understanding pre-1850s fire history and its effect on forest structure can provide insights useful for fire managers in developing plans to moderate fire hazards in the face of forecasted climate change. While climate clearly plays a substantial role in California wildfires, traditional use of fire by Indigenous people also affected fire history and forest structure in the Sierra Nevada. Disentangling the effects of human versus climatically-induced fire on Sierran forests from paleoecological records has historically proved challenging, but here we use pollen-based forest structure reconstructions and comparative paleoclimatic-vegetation response modeling to identify periods of human impact over the last 1300 years at Markwood Meadow, Sierra National Forest. We find strong evidence for anthropogenic fires at Markwood Meadow ca. 1550 – 1750 C.E., contemporaneous with archaeological evidence for fundamental shifts in Indigenous lifeways. When we compare our findings to five other paleoecological sites in the central and southern Sierra Nevada, we find evidence for contemporaneous anthropogenic effects on forest structure across a broad swath of cismontane central California. This is significant because it implies that late 19th and early twentieth century forest structure – the structure that land managers most often seek to emulate – was in part the result anthropogenic fire and precolonial resource management. We consequently suggest that modern management strategies consider (1) further incorporating traditional ecological knowledge fire practices in consultation with local tribal groups, and (2) using pollen-based reconstructions to track how forest composition compares to pre-1850 C.E. conditions rather than the novel forest states encountered in the late 20th and early twenty-first centuries. These strategies could help mitigate the effects of forecast climate change and associated megafires on forests and on socio-ecological systems in a more comprehensive manner.
了解 19 世纪 50 年代以前的火灾历史及其对森林结构的影响,有助于火灾管理者制定计划,在预测气候变化的情况下减轻火灾危害。虽然气候显然在加利福尼亚野火中扮演了重要角色,但土著人传统的用火方式也影响了内华达山脉的火灾历史和森林结构。从古生态学记录中厘清人为火灾和气候引起的火灾对锡耶拉森林的影响历来具有挑战性,但在本文中,我们利用基于花粉的森林结构重建和古气候-植被响应比较模型,确定了锡耶拉国家森林公园马克伍德草甸在过去 1300 年中受人类影响的时期。我们发现了约公元前 1550 年至 1750 年马克伍德草甸发生人为火灾的有力证据,与此同时,考古证据表明土著人的生活方式发生了根本性转变。当我们将我们的发现与内华达山脉中部和南部的其他五个古生态遗址进行比较时,我们发现有证据表明,在加利福尼亚州中部广大的沼泽地带,同时代的人为因素对森林结构产生了影响。这一点意义重大,因为它意味着 19 世纪末和 20 世纪初的森林结构--土地管理者最常试图模仿的结构--在一定程度上是人为火灾和前殖民时期资源管理的结果。因此,我们建议现代管理策略应考虑:(1)与当地部落团体协商,进一步融入传统生态知识的防火实践;(2)使用基于花粉的重建方法,跟踪森林组成与公元前 1850 年前的状况相比如何,而不是 20 世纪末和 21 世纪初遇到的新森林状态。这些战略有助于以更全面的方式减轻预测气候变化和相关特大火灾对森林和社会生态系统的影响。
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引用次数: 0
Fire regimes of the Southern Appalachians may radically shift under climate change 在气候变化的影响下,南阿巴拉契亚山脉的火灾机制可能会发生根本变化
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-01-12 DOI: 10.1186/s42408-023-00231-1
Zachary J. Robbins, E. L. Loudermilk, Tina G. Mozelewski, Kate Jones, R. Scheller
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引用次数: 0
Simulating long-term wildfire impacts on boreal forest structure in Central Yakutia, Siberia, since the Last Glacial Maximum 模拟末次冰川极盛时期以来野火对西伯利亚雅库特中部北方森林结构的长期影响
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-01-04 DOI: 10.1186/s42408-023-00238-8
Ramesh Glückler, Josias Gloy, Elisabeth Dietze, Ulrike Herzschuh, Stefan Kruse
Wildfires are recognized as an important ecological component of larch-dominated boreal forests in eastern Siberia. However, long-term fire-vegetation dynamics in this unique environment are poorly understood. Recent paleoecological research suggests that intensifying fire regimes may induce millennial-scale shifts in forest structure and composition. This may, in turn, result in positive feedback on intensifying wildfires and permafrost degradation, apart from threatening human livelihoods. Most common fire-vegetation models do not explicitly include detailed individual-based tree population dynamics, but a focus on patterns of forest structure emerging from interactions among individual trees may provide a beneficial perspective on the impacts of changing fire regimes in eastern Siberia. To simulate these impacts on forest structure at millennial timescales, we apply the individual-based, spatially explicit vegetation model LAVESI-FIRE, expanded with a new fire module. Satellite-based fire observations along with fieldwork data were used to inform the implementation of wildfire occurrence and adjust model parameters. Simulations of annual forest development and wildfire activity at a study site in the Republic of Sakha (Yakutia) since the Last Glacial Maximum (c. 20,000 years BP) highlight the variable impacts of fire regimes on forest structure throughout time. Modeled annual fire probability and subsequent burned area in the Holocene compare well with a local reconstruction of charcoal influx in lake sediments. Wildfires can be followed by different forest regeneration pathways, depending on fire frequency and intensity and the pre-fire forest conditions. We find that medium-intensity wildfires at fire return intervals of 50 years or more benefit the dominance of fire-resisting Dahurian larch (Larix gmelinii (Rupr.) Rupr.), while stand-replacing fires tend to enable the establishment of evergreen conifers. Apart from post-fire mortality, wildfires modulate forest development mainly through competition effects and a reduction of the model’s litter layer. With its fine-scale population dynamics, LAVESI-FIRE can serve as a highly localized, spatially explicit tool to understand the long-term impacts of boreal wildfires on forest structure and to better constrain interpretations of paleoecological reconstructions of fire activity.
野火被认为是西伯利亚东部以落叶松为主的北方森林的重要生态组成部分。然而,人们对这一独特环境中的长期火灾-植被动态却知之甚少。最近的古生态学研究表明,不断加剧的火灾机制可能会导致森林结构和组成发生千年规模的变化。这反过来又可能导致野火加剧和永久冻土退化的正反馈,并威胁到人类的生计。大多数常见的火灾-植被模型都没有明确包括详细的基于个体的树木种群动态,但关注个体树木之间相互作用所产生的森林结构模式可能会为了解西伯利亚东部火灾制度变化的影响提供一个有益的视角。为了在千年时间尺度上模拟这些对森林结构的影响,我们应用了基于个体、空间明确的植被模型 LAVESI-FIRE,并扩展了一个新的火灾模块。基于卫星的火灾观测数据和实地考察数据被用来为野火发生提供信息并调整模型参数。在萨哈共和国(雅库特)的一个研究地点,模拟了自末次冰川极盛时期(约公元前 2 万年)以来的年度森林发展和野火活动,突出显示了火灾机制在不同时期对森林结构的不同影响。模拟的全新世年火灾概率和随后的烧毁面积与当地湖泊沉积物中木炭流入量的重建结果进行了很好的比较。野火之后可能会出现不同的森林再生途径,这取决于火灾频率和强度以及火灾前的森林状况。我们发现,间隔 50 年或更长的中等强度野火有利于耐火的达胡里亚落叶松(Larix gmelinii (Rupr.) Rupr.)的优势地位,而取代林分的野火则有利于常绿针叶树的建立。除了火后死亡率,野火主要通过竞争效应和减少模型的枯落物层来调节森林的发展。LAVESI-FIRE 具有精细的种群动态,可以作为一种高度本地化、空间明确的工具,用于了解北方野火对森林结构的长期影响,并更好地约束对火灾活动的古生态重建的解释。
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引用次数: 0
Fuel types misrepresent forest structure and composition in interior British Columbia: a way forward. 燃料类型错误地反映了不列颠哥伦比亚省内陆地区的森林结构和组成:前进之路。
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-01-01 Epub Date: 2024-02-07 DOI: 10.1186/s42408-024-00249-z
Jennifer N Baron, Paul F Hessburg, Marc-André Parisien, Gregory A Greene, Sarah E Gergel, Lori D Daniels

Background: A clear understanding of the connectivity, structure, and composition of wildland fuels is essential for effective wildfire management. However, fuel typing and mapping are challenging owing to a broad diversity of fuel conditions and their spatial and temporal heterogeneity. In Canada, fuel types and potential fire behavior are characterized using the Fire Behavior Prediction (FBP) System, which uses an association approach to categorize vegetation into 16 fuel types based on stand structure and composition. In British Columbia (BC), provincial and national FBP System fuel type maps are derived from remotely sensed forest inventory data and are widely used for wildfire operations, fuel management, and scientific research. Despite their widespread usage, the accuracy and applicability of these fuel type maps have not been formally assessed. To address this knowledge gap, we quantified the agreement between on-site assessments and provincial and national fuel type maps in interior BC.

Results: We consistently found poor correspondence between field assessment data and both provincial and national fuel types. Mismatches were particularly frequent for (i) dry interior ecosystems, (ii) mixedwood and deciduous fuel types, and (iii) post-harvesting conditions. For 58% of field plots, there was no suitable match to the extant fuel structure and composition. Mismatches were driven by the accuracy and availability of forest inventory data and low applicability of the Canadian FBP System to interior BC fuels.

Conclusions: The fuel typing mismatches we identified can limit scientific research, but also challenge wildfire operations and fuel management decisions. Improving fuel typing accuracy will require a significant effort in fuel inventory data and system upgrades to adequately represent the diversity of extant fuels. To more effectively link conditions to expected fire behavior outcomes, we recommend a fuel classification approach and emphasis on observed fuels and measured fire behavior data for the systems we seek to represent.

Supplementary information: The online version contains supplementary material available at 10.1186/s42408-024-00249-z.

背景:清楚地了解野地燃料的连通性、结构和组成对于有效的野火管理至关重要。然而,由于燃料条件的广泛多样性及其时空异质性,燃料类型划分和绘图具有挑战性。在加拿大,燃料类型和潜在火灾行为是通过火灾行为预测(FBP)系统来描述的,该系统采用关联方法,根据林分结构和组成将植被分为 16 种燃料类型。在不列颠哥伦比亚省(BC 省),省级和国家级 FBP 系统燃料类型图来自遥感森林资源数据,被广泛用于野火行动、燃料管理和科学研究。尽管使用广泛,但这些燃料类型图的准确性和适用性尚未得到正式评估。为了填补这一知识空白,我们对不列颠哥伦比亚省内陆地区的现场评估与省级和国家级燃料类型图之间的一致性进行了量化:我们一致发现,现场评估数据与省级和国家级燃料类型之间的对应性很差。不匹配现象在以下方面尤为常见:(i) 干旱的内陆生态系统;(ii) 杂木和落叶燃料类型;(iii) 采伐后条件。在 58% 的野外地块中,没有与现存燃料结构和组成匹配的地块。造成不匹配的原因是森林资源清查数据的准确性和可用性,以及加拿大森林分类系统对不列颠哥伦比亚省内陆燃料的适用性较低:我们发现的燃料类型不匹配不仅会限制科学研究,还会给野火行动和燃料管理决策带来挑战。要提高燃料分类的准确性,需要在燃料清单数据和系统升级方面做出巨大努力,以充分反映现存燃料的多样性。为了更有效地将条件与预期的火灾行为结果联系起来,我们建议采用燃料分类方法,并将重点放在观测到的燃料和测量到的火灾行为数据上,以代表我们所寻求的系统:在线版本包含补充材料,可查阅 10.1186/s42408-024-00249-z。
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Fire Ecology
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