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Fire regimes and management options in mixed grassland-fynbos vegetation, South Africa 南非草原-森林混合植被的火灾机制和管理方案
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-03-18 DOI: 10.1186/s42408-024-00262-2
Izak P. J. Smit, Johan A. Baard, Brian W. van Wilgen
Fire regimes in South African fynbos shrublands have been quantified in the western (winter rainfall) and central (aseasonal rainfall) parts. They have not been quantified at their eastern extremity (summer rainfall), where fynbos transitions to grassland and is embedded in other fire-resistant vegetation types. We assessed fire regimes at the eastern extremity of the fynbos biome and discussed the ecological and management implications of our findings. Using remote sensing, we assessed fires over 21 years in a 350,000-ha study area at the eastern edge of the fynbos biome. Only 9% of the study area burned, almost exclusively in mixed grassland-fynbos vegetation. The largest proportion (44% of the total area burnt) burnt in late winter and early spring, but fires occurred throughout the year. Fires only occurred in 39% of the mixed grassland-fynbos vegetation. Of the mixed grassland-fynbos vegetation that did burn, 44%, 11%, 26%, and 19% experienced one, two, three, and four fires, respectively. Areas with multiple fires had return intervals ranging from 3 to 15 years, with 76% of the area with multiple fires burning every 4 to 6 years. Most large fires were preceded by two relatively dry months, when fuels were drier and more flammable. The mixed grassland-fynbos vegetation at the eastern extremity of the fynbos biome is surrounded by fire-resistant vegetation and exhibits a varied fire regime, with different parts experiencing frequent, infrequent, or no fire over 21 years. Fires were largely aseasonal, occurring throughout the year, although data over more years may reveal that a greater proportion of fires will occur in winter, when grasses are cured and rainfall is low, as well as after relatively long (> 2 months) periods of below-average rainfall. As most fires would burn out safely against fire-resistant vegetation, we conclude that lightning-ignited fires should be allowed to spread unhindered to approximate a natural and heterogeneous fire regime, provided that no neighboring properties or infrastructure are threatened. The response of the biota to fires is not well understood for this transition area, and further research is needed.
已经对南非芬布灌木林地西部(冬季降雨)和中部(季节性降雨)的火灾机制进行了量化。但对其东端(夏季降雨)的火灾情况还没有进行量化,因为那里的芬布斯林会过渡到草地,并与其他耐火植被类型相融合。我们评估了芬博斯生物群落东端的火灾机制,并讨论了我们的发现对生态和管理的影响。利用遥感技术,我们评估了芬博斯生物群落东部边缘 350,000 公顷研究区域 21 年来的火灾情况。只有 9% 的研究区域发生过火灾,几乎全部发生在草地-凤尾草混合植被中。冬末春初燃烧的面积最大(占燃烧总面积的 44%),但全年都有火灾发生。火灾只发生在 39% 的草原-雌雄混交植被中。在发生火灾的混合草地-鹅掌楸植被中,分别有 44%、11%、26% 和 19% 经历了一次、两次、三次和四次火灾。发生过多次火灾的地区的火灾发生间隔为 3 到 15 年不等,其中 76% 发生过多次火灾的地区每隔 4 到 6 年就会发生一次火灾。大多数大火都发生在两个相对干燥的月份之前,此时燃料更干燥、更易燃。位于芬博斯生物群落最东端的草地-芬博斯混合植被被耐火植被所包围,其火灾情况各不相同,在 21 年中,不同的地区经常发生火灾、不经常发生火灾或没有发生火灾。火灾基本上是季节性的,一年四季都会发生,不过更多年的数据可能会显示,火灾发生在冬季的比例会更大,因为此时草已经枯萎,降雨量较低,而且降雨量低于平均水平的时间相对较长(超过 2 个月)。由于大多数火灾都会在耐火植被的保护下安全烧尽,因此我们得出结论,在不威胁邻近财产或基础设施的情况下,应允许雷电引发的火灾不受阻碍地蔓延,以接近自然和异质的火灾机制。在这一过渡区域,生物群对火灾的反应尚不十分清楚,需要进一步研究。
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引用次数: 0
Branching out: species-specific canopy architecture limits live crown fuel consumption in Intermountain West USA conifers 分枝:物种特有的树冠结构限制了美国西部山区针叶树的活冠燃料消耗
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-03-15 DOI: 10.1186/s42408-024-00261-3
Elliott T. Conrad, W. Matt Jolly, Tegan P. Brown, Samuel C. Hillman
Accurate estimates of available live crown fuel loads are critical for understanding potential wildland fire behavior. Existing crown fire behavior models assume that available crown fuels are limited to all tree foliage and half of the fine branches less than 6 mm in diameter (1 h fuel). They also assume that this relationship is independent of the branchwood moisture content. Despite their widespread use, these assumptions have never been tested, and our understanding of the physiochemical properties that govern live crown flammability and consumption remains limited. To test these assumptions, we sampled branches from 11 common Intermountain West USA conifers and determined the corrected available fuel estimates using physiochemical measurements, diameter subsize class distributions, and a bench-scale consumption experiment. Additional branches were air-dried to explore interaction between moisture content and consumption. Corrected available live crown fuel was compared to existing models across species and then used to determine potential differences in crown fire energy release. Across the 11 common conifers, distinct patterns of sub 1 h fuel distributions were strong predictors of whether the existing available live crown fuel models overestimated, approximately correctly estimated, or underestimated available live fuel. Fine branchwood distributions generally fell into three archetypes: fine skewed, normally distributed, and coarse skewed. Based on our corrected estimates, existing models overestimated the potential canopy energy by 34% for an average-sized western larch and underestimated it by 18.8% for western hemlock. The critical fine branchwood consumption diameter varied with species and moisture content. Larger proportions of fine branches were consumed as the branchwood dried, and nearly all the 1 h fuel was consumed when the branches were completely dry. These results suggest that available live canopy fuel load estimates should consider species and moisture content to accurately assess and map fuel loads across landscapes. This work has implications for forest and fire management in conifer-dominated forests throughout western North America, and in other similar forests worldwide.
准确估算可用的活树冠燃料负荷对于了解潜在的野地火灾行为至关重要。现有的树冠火灾行为模型假定可用的树冠燃料仅限于所有树叶和直径小于 6 毫米的一半细枝(1 h 燃料)。它们还假设这种关系与枝木含水量无关。尽管这些假设被广泛使用,但从未经过测试,我们对控制活树冠可燃性和消耗的理化特性的了解仍然有限。为了验证这些假设,我们从 11 种常见的美国西部山间针叶树的树枝上取样,并利用理化测量、直径亚尺寸等级分布和台架规模的消耗实验确定了修正后的可用燃料估算值。还对其他树枝进行了风干,以探索水分含量与消耗量之间的相互作用。修正后的活树冠可用燃料与各树种的现有模型进行了比较,然后用于确定树冠火灾能量释放的潜在差异。在 11 种常见针叶树中,1 h 以下燃料分布的不同模式是现有可用活冠燃料模型高估、近似正确估计或低估可用活燃料的有力预测因素。细枝木分布一般分为三种原型:细斜分布、正态分布和粗斜分布。根据我们的修正估计,现有模型对平均大小的西部落叶松的树冠潜在能量高估了 34%,对西部铁杉则低估了 18.8%。临界细枝木消耗直径因树种和含水率而异。随着枝干的干燥,细枝被消耗的比例越来越大,当枝干完全干燥时,几乎所有的 1 h 燃料都被消耗掉了。这些结果表明,现有的活树冠燃料负荷估算应考虑树种和含水量,以准确评估和绘制整个地貌的燃料负荷图。这项工作对北美西部针叶林为主的森林以及全球其他类似森林的森林和火灾管理具有重要意义。
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引用次数: 0
Spatial and temporal patterns and driving factors of forest fires based on an optimal parameter-based geographic detector in the Panxi region, Southwest China 基于最优参数地理探测器的中国西南攀西地区森林火灾时空模式及驱动因素
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-03-15 DOI: 10.1186/s42408-024-00257-z
Jia Liu, Yukuan Wang, Haiyan Guo, Yafeng Lu, Yuanxin Xu, Yu Sun, Weiwei Gan, Rui Sun, Zhengyang Li
The Panxi region in China is among the areas that are most severely impacted by forest fires. Despite this, there is currently a lack of comprehensive and systematic research on the spatial and temporal distribution patterns, as well as the drivers, of forest fires in the region. To reveal bio-geo-climatic and anthropogenic influences, this study investigated the temporal and spatial characteristics of forest fires and migration patterns of the center of gravity of forest fires in Panxi. A parametric optimal geographical detection model was utilized to quantify the influence of various individual factors and their combinations on the spatial patterns of forest fire occurrence in the whole Panxi region and sub-region, by analyzing the forest fire dataset from 2004 to 2020. From 2004 to 2020, the Panxi region experienced an upward trend in the number of forest fires and the area burned. However, the trends were not consistent over the entire period. Between 2004 and 2014, both the number of fires and the area burned showed fluctuations and an overall increase. In contrast, between 2015 and 2020, there was a significant decrease in the number of fires, while the area burned showed a continued upward trend. The study identified abrupt changes in the frequency of forest fires and burned areas, primarily in 2007 and 2016. Spatially, forest fires in Panxi exhibited a positive correlation and local clustering. The river valley basin and hilly regions displayed a higher incidence of forest fires, which were concentrated mainly along the hill edges. In the whole area of Panxi, climatic factors have a predominant influence on forest fire occurrences. Specifically, evaporation, maximum temperature, average temperature, number of days without rain, and minimum temperature demonstrated the strongest explanatory power. Furthermore, this relationship was found to be reinforced when combined with topographical, human activities, and vegetation factors. The spatial variation of drought within each sub-district has a stronger explanatory power for the distribution characteristics of forest fires in the region than at the Panxi-wide scale. The factor with the maximum interaction in most regions was the dual factor of rainfall and drought. The study’s findings validate the applicability of geographic probes for identifying the drivers of fire occurrence and enhance our understanding of the drivers and their combined effects on the spatial context of the fire-incident study area.
中国攀西地区是受森林火灾影响最严重的地区之一。尽管如此,目前对该地区森林火灾的时空分布模式和驱动因素还缺乏全面系统的研究。为了揭示生物地理气候和人为因素的影响,本研究调查了攀西地区森林火灾的时空特征和森林火灾重心的迁移规律。通过对 2004-2020 年森林火灾数据集的分析,利用参数最优地理探测模型,量化了各种单独因素及其组合对整个攀西地区和次区域森林火灾发生空间格局的影响。从 2004 年到 2020 年,攀西地区的森林火灾次数和燃烧面积呈上升趋势。然而,整个期间的趋势并不一致。2004 年至 2014 年期间,火灾次数和燃烧面积均呈波动和总体上升趋势。相比之下,在 2015 年至 2020 年期间,火灾次数显著减少,而燃烧面积则呈持续上升趋势。研究发现,森林火灾频率和烧毁面积的突然变化主要发生在 2007 年和 2016 年。从空间上看,攀西地区的森林火灾呈现出正相关性和局部聚集性。河谷盆地和丘陵地区森林火灾发生率较高,主要集中在山体边缘。在整个攀西地区,气候因素对森林火灾的发生具有主导影响。其中,蒸发量、最高气温、平均气温、无雨日数和最低气温的解释力最强。此外,这种关系在与地形、人类活动和植被因素相结合时得到了加强。与全攀西范围相比,各分区干旱的空间变化对该地区森林火灾分布特征的解释力更强。在大多数地区,降雨和干旱双重因子的交互作用最大。研究结果验证了地理探针在识别火灾发生驱动因素方面的适用性,并加深了我们对火灾发生驱动因素及其对火灾发生研究区域空间环境的综合影响的理解。
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引用次数: 0
Blanket bog vegetation response to wildfire and drainage suggests resilience to low severity, infrequent burning 块状沼泽植被对野火和排水的反应表明,它们对低强度、不频繁的燃烧有较强的适应能力
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-03-14 DOI: 10.1186/s42408-024-00256-0
Roxane Andersen, Paula Fernandez-Garcia, Alice Martin-Walker, Daniela Klein, Chris Marshall, David J. Large, Robert Hughes, Mark H. Hancock
In 2019, a wildfire impacted an area of blanket bog and wet heath > 60 km2 in the Flow Country peatlands of northern Scotland, a site of global significance. Unusually the footprint of the wildfire included discrete areas of degraded, restored, and near-natural blanket bogs. Following the wildfire, we surveyed vegetation in 387 quadrats in burnt and unburnt areas. The study aimed to determine whether and how proximity to human-made drains and microtopography affected fire-vegetation interactions and included older wildfire sites and unburnt control sites for context. Overall, our study suggests that the 2019 Flow Country wildfire caused mostly superficial burning; except in the most degraded area, which burned more severely and where we recorded more profound impacts on the vegetation. We found higher cover of litter, which in turn led to increased localized fire damage in quadrats close to drains compared with quadrats away from the influence of drains. We also found greater fire impacts (e.g., proportions of moss burnt and Sphagnum discoloration) on hummocks, particularly where they were higher relative to the hollows. Overall, vegetation both near and away from drains largely resembled nearby unburnt sites within 20 years. Overall, our study suggests that the 2019 Flow Country wildfire caused mostly superficial burning, except in the most degraded areas. Vegetation communities of blanket bogs associated with conservation and restoration areas in the region appear to be largely resilient to occasional, low severity wildfires. This implies that management interventions that maintain wet conditions in peatlands have the potential to help reduce the risks of severe wildfires.
2019 年,一场野火影响了苏格兰北部流乡泥炭地面积大于 60 平方公里的毯状沼泽和湿石楠区,这是一个具有全球意义的地点。不同寻常的是,野火的足迹包括退化、恢复和接近自然的毯状沼泽的离散区域。野火发生后,我们对烧毁和未烧毁区域的 387 个四分区进行了植被调查。该研究旨在确定与人为排水沟和微地形的距离是否以及如何影响火灾与植被之间的相互作用,并将较早的野火地点和未烧毁的对照地点纳入研究范围。总体而言,我们的研究表明,2019 年流溪河流域野火主要造成表层燃烧;但在退化最严重的地区除外,那里的燃烧更为严重,我们记录到那里的植被受到了更深远的影响。我们发现,与远离排水沟影响的四分区相比,靠近排水沟的四分区垃圾覆盖率更高,这反过来又导致局部火害加剧。我们还发现,火灾对沼丘的影响更大(例如,苔藓被烧毁的比例和泥炭藓变色),尤其是在沼丘相对于洼地较高的地方。总体而言,在 20 年内,靠近和远离排水沟的植被与附近未被烧毁的地点基本相似。总体而言,我们的研究表明,除了最退化的地区外,2019 年流乡野火造成的大部分是表层燃烧。与该地区保护和恢复区相关的毯状沼泽植被群落似乎在很大程度上能够抵御偶尔发生的低强度野火。这意味着,保持泥炭地湿润条件的管理干预措施有可能有助于降低严重野火的风险。
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引用次数: 0
Global impacts of fire regimes on wildland bird diversity 全球火灾机制对野地鸟类多样性的影响
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-03-13 DOI: 10.1186/s42408-024-00259-x
Fátima Arrogante-Funes, Inmaculada Aguado, Emilio Chuvieco
Fire is a natural disturbance that significantly impacts ecosystems and plays a crucial role in the distribution and preservation of biota worldwide. The effects of fires on bird diversity can be both positive, as they can create new habitats, and negative, as they can reduce nesting success. To fully understand the ecological implications of wildfires, we need to understand the spatial distribution of wildland bird diversity and fire regimes and how fire regimes affect wildland bird diversity ecosystems. Using data collected at a global scale, we examined effects of time-averaged fire regimes on the spatial diversity of wildland bird species. Initially, we used the MaxEnt algorithm to model the potential distribution of 1,115 wildland bird species over a 20-year period. We also processed satellite observations of burned areas (FIRECCI51) during the same period to estimate fire regime characteristics, including the average proportion of burnt vegetation, interannual variability in the burnt area, and fire intensity. Finally, the association between wild bird diversity and fire variables in each biome was determined through Spearman, Bonferroni, and Kruskal-Wallis statistics. Our findings revealed that (I) the most affected wildland bird communities are those found in tropical ecosystems, where the majority of fires occur; (II) high fire intensity values and a substantial proportion of burned vegetation have a positive impact on maintaining a diverse population of wildland birds in biomes characterized by savannah or grassland covers, as seen in temperate or tropical zones. Conversely, low fire intensity values and a smaller proportion of burned vegetation also promote greater diversity of wildland birds in boreal or temperate zones, and (III) in Mediterranean ecosystems, a clear association between wildland bird diversity and wildfires could not be established. This research could help identify areas that are ecologically vulnerable to wildfires. It could also be useful in guiding regional studies aligned with developing sustainable landscape management practices and conserving priority ecological zones in tropical ecosystems.
火灾是一种对生态系统有重大影响的自然干扰,在全球生物群落的分布和保护方面起着至关重要的作用。火灾对鸟类多样性的影响既可能是积极的,因为火灾可以创造新的栖息地;也可能是消极的,因为火灾会降低鸟类筑巢的成功率。为了充分了解野火对生态的影响,我们需要了解野地鸟类多样性和火灾机制的空间分布,以及火灾机制如何影响野地鸟类多样性生态系统。利用在全球范围内收集的数据,我们研究了时间平均火灾机制对野鸟物种空间多样性的影响。首先,我们使用 MaxEnt 算法模拟了 1,115 种野地鸟类在 20 年间的潜在分布情况。我们还处理了同期烧毁面积的卫星观测数据(FIRECCI51),以估算火情特征,包括烧毁植被的平均比例、烧毁面积的年际变化和火灾强度。最后,通过 Spearman、Bonferroni 和 Kruskal-Wallis 统计法确定了每个生物群落中野生鸟类多样性与火灾变量之间的关联。我们的研究结果表明:(I) 受影响最大的野鸟群落是热带生态系统中的野鸟群落,因为大多数火灾都发生在热带地区;(II) 在温带或热带地区以热带草原或草地覆盖为特征的生物群落中,高火灾强度值和大量被烧毁的植被对维持野鸟的多样性有积极影响。相反,在北方或温带地区,低火力值和较小比例的燃烧植被也会促进野地鸟类的多样性;(III)在地中海生态系统中,野地鸟类多样性与野火之间无法建立明确的联系。这项研究有助于确定在生态上易受野火影响的地区。这项研究还有助于指导区域研究,以制定可持续景观管理方法和保护热带生态系统中的重点生态区。
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引用次数: 0
Historical fire regimes from red pines (Pinus resinosa Ait.) across the Tension Zone in the Lower Peninsula, Michigan USA 美国密歇根州下半岛张力带红松(Pinus resinosa Ait.)的历史火灾机制
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-03-08 DOI: 10.1186/s42408-024-00253-3
Michael C. Stambaugh, Joseph M. Marschall, Erin R. Abadir, Richard P. Guyette, Daniel C. Dey
Currently, no multiple century fire scar records have been constructed in the Lower Peninsula of Michigan, USA, a region where historical vegetation ranged from prairies and oak-dominated woodlands in the south to conifer-northern hardwood forests and swamps to the north. The western portion of the Huron-Manistee National Forests is located within this strong vegetation transition (i.e., “Tension Zone”) and, based on this study, has well-preserved remnant red pine trees dating back to at least the late 1400s with fire scars dating back to 1523. From fire scar records constructed at four study sites, we documented historical fires as having a wide range of fire intervals and seasonalities. A general timeline of fire activity changes in this region can be described as relatively frequent fire in the pre- and early-European contact eras, variable and generally less fire from this point forward until the period of major logging activities after which fire frequency was significantly increased. Historical fires were associated with drought in the year of fire. Some broad synchronies of fire occurrence existed among sites such as 3 of 4 sites recording fires in years 1717, 1774, and 1829. Interestingly, these years were not exceptionally dry nor among the driest fire years. Future development of fire scar records will likely improve spatio-temporal characterization of regional fire regimes including understanding of human-climate-fire dynamics.
目前,美国密歇根州下半半岛还没有多个世纪的火灾疤痕记录,该地区的历史植被从南部的大草原和橡树为主的林地到北部的针叶林-北方阔叶林和沼泽不等。休伦-曼尼斯蒂尔国家森林的西部位于这一植被强烈过渡区(即 "张力区"),根据这项研究,这里保存完好的残存红松至少可追溯到 14 世纪晚期,火痕可追溯到 1523 年。根据在四个研究地点建立的火痕记录,我们发现历史上的火灾有很宽的火灾间隔和季节性。该地区火灾活动变化的总体时间表可以描述为:在与欧洲接触前和接触初期,火灾相对频繁,此后火灾多变且普遍较少,直到主要伐木活动时期,此后火灾频率显著增加。历史上的火灾与火灾发生当年的干旱有关。不同地点之间的火灾发生有一些广泛的同步性,例如在 1717 年、1774 年和 1829 年,4 个地点中有 3 个发生了火灾。有趣的是,这些年份并不是特别干旱,也不是最干旱的火灾年份。未来火痕记录的发展可能会改善区域火灾机制的时空特征,包括对人类-气候-火灾动态的理解。
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引用次数: 0
Assessment of forest fire severity and land surface temperature using Google Earth Engine: a case study of Gujarat State, India 利用谷歌地球引擎评估森林火灾严重程度和地表温度:印度古吉拉特邦案例研究
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-03-07 DOI: 10.1186/s42408-024-00254-2
Keval H. Jodhani, Haard Patel, Utsav Soni, Rishabh Patel, Bhairavi Valodara, Nitesh Gupta, Anant Patel, Padam jee Omar
Forest fires are a recurring issue in many parts of the world, including India. These fires can have various causes, including human activities (such as agricultural burning, campfires, or discarded cigarettes) and natural factors (such as lightning). The present study presents a comprehensive and advanced methodology for assessing wildfire susceptibility by integrating diverse environmental variables and leveraging cutting-edge machine learning techniques across Gujarat State, India. The primary goal of the study is to utilize Google Earth Engine to compare locations in Gujarat, India, before and after forest fires. High-resolution satellite data were used to assess the amount and types of changes caused by forest fires. The present study meticulously analyzes various environmental variables, i.e., slope orientation, elevation, normalized difference vegetation index (NDVI), drainage density, precipitation, and temperature to understand landscape characteristics and assess wildfire susceptibility. In addition, a sophisticated random forest regression model is used to predict land surface temperature based on a set of environmental parameters. The maps that result depict the geographical distribution of normalized burn ratio and difference normalized burn ratio and land surface temperature forecasts, providing valuable insights into spatial patterns and trends. The findings of this work show that an automated temporal analysis utilizing Google Earth Engine may be used successfully over a wide range of land cover types, providing critical data for future monitoring of such threats. The impact of forest fires can be severe, leading to the loss of biodiversity, damage to ecosystems, and threats to human settlements.
森林火灾是包括印度在内的世界许多地区经常发生的问题。这些火灾的起因多种多样,包括人类活动(如农业焚烧、篝火或丢弃的香烟)和自然因素(如闪电)。本研究通过整合各种环境变量,并利用印度古吉拉特邦的尖端机器学习技术,提出了一种评估野火易发性的全面而先进的方法。本研究的主要目标是利用谷歌地球引擎对印度古吉拉特邦发生森林火灾前后的地点进行比较。高分辨率卫星数据用于评估森林火灾造成的变化数量和类型。本研究细致分析了各种环境变量,即坡度方向、海拔、归一化差异植被指数(NDVI)、排水密度、降水量和温度,以了解地貌特征并评估野火易发性。此外,还使用复杂的随机森林回归模型,根据一组环境参数预测地表温度。由此绘制的地图描述了归一化燃烧比、归一化燃烧比差值和地表温度预测的地理分布,为了解空间模式和趋势提供了宝贵的信息。这项工作的结果表明,利用谷歌地球引擎进行的自动时间分析可成功应用于多种土地覆被类型,为今后监测此类威胁提供重要数据。森林火灾的影响可能非常严重,会导致生物多样性丧失、生态系统遭到破坏,并对人类住区构成威胁。
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引用次数: 0
Wildfire probability estimated from recent climate and fine fuels across the big sagebrush region 根据最近的气候和整个大沙棘灌木地区的细小燃料估算出的野火概率
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-02-28 DOI: 10.1186/s42408-024-00252-4
Martin C. Holdrege, Daniel R. Schlaepfer, Kyle A. Palmquist, Michele Crist, Kevin E. Doherty, William K. Lauenroth, Thomas E. Remington, Karin Riley, Karen C. Short, John C. Tull, Lief A. Wiechman, John B. Bradford
Wildfire is a major proximate cause of historical and ongoing losses of intact big sagebrush (Artemisia tridentata Nutt.) plant communities and declines in sagebrush obligate wildlife species. In recent decades, fire return intervals have shortened and area burned has increased in some areas, and habitat degradation is occurring where post-fire re-establishment of sagebrush is hindered by invasive annual grasses. In coming decades, the changing climate may accelerate these wildfire and invasive feedbacks, although projecting future wildfire dynamics requires a better understanding of long-term wildfire drivers across the big sagebrush region. Here, we integrated wildfire observations with climate and vegetation data to derive a statistical model for the entire big sagebrush region that represents how annual wildfire probability is influenced by climate and fine fuel characteristics. Wildfire frequency varied significantly across the sagebrush region, and our statistical model represented much of that variation. Biomass of annual and perennial grasses and forbs, which we used as proxies for fine fuels, influenced wildfire probability. Wildfire probability was highest in areas with high annual forb and grass biomass, which is consistent with the well-documented phenomenon of increased wildfire following annual grass invasion. The effects of annuals on wildfire probability were strongest in places with dry summers. Wildfire probability varied with the biomass of perennial grasses and forbs and was highest at intermediate biomass levels. Climate, which varies substantially across the sagebrush region, was also predictive of wildfire probability, and predictions were highest in areas with a low proportion of precipitation received in summer, intermediate precipitation, and high temperature. We developed a carefully validated model that contains relatively simple and biologically plausible relationships, with the goal of adequate performance under novel conditions so that useful projections of average annual wildfire probability can be made given general changes in conditions. Previous studies on the impacts of vegetation and climate on wildfire probability in sagebrush ecosystems have generally used more complex machine learning approaches and have usually been applicable to only portions of the sagebrush region. Therefore, our model complements existing work and forms an additional tool for understanding future wildfire and ecological dynamics across the sagebrush region.
野火是导致完整的大鼠尾草(Artemisia tridentata Nutt.)近几十年来,火灾发生的时间间隔缩短了,一些地区的焚烧面积增加了,在火灾后重新建立的鼠尾草受到入侵一年生草类的阻碍时,栖息地正在退化。在未来几十年中,气候的变化可能会加速这些野火和入侵的反馈作用,但预测未来的野火动态需要更好地了解整个大鼠尾草地区的长期野火驱动因素。在这里,我们将野火观测数据与气候和植被数据相结合,为整个大鼠尾草地区推导出了一个统计模型,该模型体现了每年野火发生的概率是如何受到气候和精细燃料特征的影响的。整个鼠尾草地区的野火频率变化很大,我们的统计模型代表了其中的大部分变化。一年生和多年生禾本科及草本植物的生物量(我们将其作为精细燃料的代用指标)影响着野火发生的概率。野火发生概率在一年生草本植物生物量高的地区最高,这与文献记载的一年生草本植物入侵后野火增加的现象一致。在夏季干燥的地方,一年生草对野火概率的影响最大。野火概率随多年生禾本科和草本植物生物量的变化而变化,在生物量处于中等水平时野火概率最高。整个鼠尾草地区的气候差异很大,气候也能预测野火发生概率,夏季降水比例低、降水量中等和温度高的地区野火发生概率最高。我们开发了一个经过仔细验证的模型,该模型包含相对简单且在生物学上合理的关系,目的是在新条件下充分发挥其性能,以便在条件发生普遍变化时对年平均野火发生概率做出有用的预测。以前关于植被和气候对鼠尾草生态系统野火发生概率的影响的研究通常使用较为复杂的机器学习方法,而且通常只适用于部分鼠尾草地区。因此,我们的模型是对现有工作的补充,是了解整个鼠尾草地区未来野火和生态动态的又一工具。
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引用次数: 0
Flammability features of native and non-native woody species from the southernmost ecosystems: a review 最南端生态系统中本地和非本地木本物种的易燃性特征:综述
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-02-15 DOI: 10.1186/s42408-024-00250-6
Octavio Toy-Opazo, Andrés Fuentes-Ramirez, Valeria Palma-Soto, Rafael A. Garcia, Kirk A. Moloney, Rodrigo Demarco, Andrés Fuentes-Castillo
Vegetation plays a crucial role in the ignition, propagation, and severity of fire, and understanding the relationship between plants and fire through flammability attributes has become a useful tool that is increasingly used in studies on fire dynamics worldwide. However, in the southern cone of South America, rather few studies have systematically and specifically addressed the flammability of vegetation, and yet fewer have compared native and non-native species. Given the increasing interest in knowing the flammability characteristics of vegetation, this review aims to assess the potential differences in flammability between native and non-native plant species that inhabit the southern cone and to identify the main methodologies and experiments used to analyze vegetation flammability. Twenty-eight species were identified, 18 native to the region and 10 non-native. Additionally, 64 experimental tests were revised to evaluate plant flammability. It was found that Cryptocarya alba, Acacia dealbata, Eucalyptus globulus, and Pinus ponderosa are the species with a high flammability index. By contrast, the species Araucaria araucana, Austrocedrus chilensis, Embothrium coccineum, and Persea lingue showed low flammability. The methodologies used to evaluate vegetation flammability were highly variable, with the use of epiradiators being the most frequent. Our review indicates that the geographic origin of vegetation (native vs. non-native in South America) is not a decisive factor in determining species-level differences in flammability. Other relevant factors that contribute with the degree of plant flammability include fuel moisture, the morphology of the species, and its internal chemical compounds. We highlight the necessity of continuing the study of plant flammability and advance in the standardization of protocols and measurements, using uniform criteria and increasing comparative studies between species, particularly in the southern cone of South America where catastrophic wildfires are increasing.
植被在火灾的点燃、传播和严重程度方面起着至关重要的作用,通过可燃性属性了解植物与火灾之间的关系已成为一种有用的工具,在全球火灾动态研究中得到越来越多的应用。然而,在南美洲南锥体地区,系统性地专门研究植被易燃性的研究相当少,对本地物种和非本地物种进行比较的研究更少。鉴于人们对了解植被可燃性特征的兴趣与日俱增,本综述旨在评估居住在南锥体的本地和非本地植物物种在可燃性方面的潜在差异,并确定用于分析植被可燃性的主要方法和实验。研究确定了 28 个物种,其中 18 个为该地区的本地物种,10 个为非本地物种。此外,还修订了 64 项实验测试,以评估植物的易燃性。结果发现,白隐翅树、相思树、桉树和松柏是易燃指数较高的树种。相比之下,Araucaria araucana、Austrocedrus chilensis、Embothrium coccineum 和 Persea lingue 的易燃指数较低。用于评估植被易燃性的方法差异很大,其中最常使用的是外辐照仪。我们的研究表明,植被的地理起源(南美洲的原生植被与非原生植被)并不是决定物种易燃性差异的决定性因素。影响植物易燃程度的其他相关因素包括燃料湿度、物种形态及其内部化合物。我们强调有必要继续研究植物的易燃性,并推进协议和测量的标准化,采用统一标准,增加物种间的比较研究,尤其是在灾难性野火不断增加的南美洲南锥体地区。
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引用次数: 0
Fire-type heat increases the germination of Cistaceae seeds in contrast to summer heat 与夏季高温相比,火热型高温可提高肉苁蓉种子的萌发率
IF 5.1 3区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2024-02-13 DOI: 10.1186/s42408-024-00251-5
Byron B. Lamont, Geoffrey E. Burrows, Juli G. Pausas
Our analyses of data in Luna et al. (Fire Ecology 19:52, 2023) do not support the proposal that dormancy release of the hard seeds in 12 species of Cistaceae is a “two-step process” involving high summer temperatures followed by fire-type heat. The reverse is true: subjection to a month of daily alternating temperatures of 50/20 °C (summer heat) is more likely to induce dormancy among initially soft seeds or secondary dormancy among those softened by fire heat or reduce the ability of fire heat to soften the seeds. The need to inspect seeds for the presence of an open “water gap” following various heat treatments, and using more realistic summer temperatures in future studies, is clear.
我们对 Luna 等人(《火灾生态学》19:52, 2023 年)中数据的分析并不支持 12 种肉苁蓉科植物硬种子的休眠释放是一个 "两步过程"(先是夏季高温,然后是火灾高温)。事实恰恰相反:在 50/20 °C(夏季高温)每日交替的一个月内,更有可能诱导最初柔软的种子进入休眠状态,或诱导因火热而软化的种子进入二次休眠状态,或降低火热软化种子的能力。显然,有必要在各种热处理后检查种子是否存在开放的 "水隙",并在今后的研究中使用更真实的夏季温度。
{"title":"Fire-type heat increases the germination of Cistaceae seeds in contrast to summer heat","authors":"Byron B. Lamont, Geoffrey E. Burrows, Juli G. Pausas","doi":"10.1186/s42408-024-00251-5","DOIUrl":"https://doi.org/10.1186/s42408-024-00251-5","url":null,"abstract":"Our analyses of data in Luna et al. (Fire Ecology 19:52, 2023) do not support the proposal that dormancy release of the hard seeds in 12 species of Cistaceae is a “two-step process” involving high summer temperatures followed by fire-type heat. The reverse is true: subjection to a month of daily alternating temperatures of 50/20 °C (summer heat) is more likely to induce dormancy among initially soft seeds or secondary dormancy among those softened by fire heat or reduce the ability of fire heat to soften the seeds. The need to inspect seeds for the presence of an open “water gap” following various heat treatments, and using more realistic summer temperatures in future studies, is clear.","PeriodicalId":12273,"journal":{"name":"Fire Ecology","volume":"32 1","pages":""},"PeriodicalIF":5.1,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139764237","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
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Fire Ecology
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