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Testing the validity of a chronosequence: Breeding bird diversity and abundance in regenerating oak-hardwood shelterwoods 测试时间序列的有效性:在再生的橡木-硬木遮荫林中繁殖鸟类的多样性和丰度
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2026-01-17 DOI: 10.1016/j.foreco.2026.123536
Marsh Hlavka, Marlyse Duguid, Mark Ashton
The characteristic shrubland of regenerating temperate mixed hardwood forests provide habitat for many early successional specialist species. The irregular shelterwood is a silvicultural method for regenerating a forest that promotes young complex shrubland landscapes for a period of 15–25 years. In this study, we surveyed bird diversity across an irregular shelterwood chronosequence of a southern New England oak-mixed hardwood forest. We measured the variation in diversity across a chronosequence comprising 31 stands and 30 years of growth as of 2022, with particular focus on nesting guilds. Secondly, we conducted a longitudinal analysis of bird diversity in each stand over a period of 16 years to assess the reliability of the shelterwood chronosequence as a within-year proxy for long-term study. Similar to many prior studies, we found that overall diversity and bird abundance decrease as the regenerating shelterwood ages. Over a 30-year period after harvest, Shannon diversity decreased by over 10 %, species richness decreased by over 20 %, and relative abundance decreased by 50 %. Shrub-nesting birds are particularly sensitive to the loss of young regenerating and shrubland habitat and decrease sharply in abundance as a forest ages, from 51 % of the population to 12 % after 30 years. Ground-nesting birds increase in abundance with young regenerating forests and tree-nesting birds are unaffected by stand age, from 8 % to 40 % over 30 years. However, most importantly, we show these trends occurred both longitudinally and within a single year, indicating that the use of a chronosequence is an effective method of measuring trends in bird abundance and diversity over a period of forest regeneration. This is the first study demonstrating the validity of this method for estimating breeding birds in temperate forests and allows for a more widespread application of its use, particularly where long-term monitoring has not been done.
温带混交林的灌丛为许多早期演替的特殊物种提供了栖息地。不规则的防护林是一种造林方法,用于再生森林,促进年轻复杂的灌木景观,持续15-25年。在这项研究中,我们调查了新英格兰南部一个不规则的栎树混合阔叶林的鸟类多样性。我们测量了截至2022年的31个林分和30年的生长时间序列中的多样性变化,特别关注了筑巢行会。其次,我们对每个林分的鸟类多样性进行了16年的纵向分析,以评估林分时间序列作为长期研究的年内代理的可靠性。与许多先前的研究类似,我们发现随着再生防护林的老化,整体多样性和鸟类丰度下降。收获后30年间,香农多样性下降了10 %以上,物种丰富度下降了20 %以上,相对丰度下降了50 %以上。灌木筑巢鸟对幼鸟再生和灌木栖息地的丧失特别敏感,随着森林年龄的增长,它们的数量急剧减少,30年后从种群的51 %减少到12 %。地面筑巢的鸟类数量随着新生森林的增加而增加,而树上筑巢的鸟类不受林龄的影响,在30年内从8% %增加到40% %。然而,最重要的是,我们发现这些趋势既发生在纵向上,也发生在一年内,这表明使用时间序列是测量森林更新期间鸟类丰度和多样性趋势的有效方法。这是第一次证明这种方法在估计温带森林中繁殖鸟类方面的有效性的研究,并允许更广泛地应用它的使用,特别是在没有进行长期监测的地方。
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引用次数: 0
Carbon stock models for early post-fire reforestation efforts in the southwestern US 美国西南部早期火灾后再造林工作的碳储量模型
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2026-01-17 DOI: 10.1016/j.foreco.2026.123507
Christopher Marsh , Matthew D. Hurteau , Owen Burney
Changing climate and high-severity wildfire are causing widespread tree mortality across the southwestern United States, significantly reducing the seed source availability to support post-fire regeneration of forest and woodland. This presents a challenge to both forest regeneration, and the potential contribution of disturbed areas to carbon storage. Planting tree seedlings can accelerate reforestation and rates of carbon sequestration, but in the semi-arid southwestern US, the carbon storage potential of reforestation efforts is uncertain due to limited information on seedling growth and survival rates. We surveyed eight post-wildfire reforestation sites and developed allometric equations to predict carbon sequestration as a function of directly measured seedling size, and indirectly using years since planting and current and future climate scenarios. Our findings highlight the critical role of seedling survival in the first few years after planting, which dramatically alters carbon stock trajectories. Future climate conditions, characterized by higher temperatures at low-elevation sites, may hinder reforestation efforts and reduce the carbon storage potential of these areas. Given our findings, we recommend climate-informed planting strategies in post-wildfire areas, including adjusting planting densities to maximize carbon stock accumulation while ensuring future wildfire resiliency. This research offers practical insights for forest managers aiming to improve reforestation outcomes, particularly as we face the challenges of a changing climate.
气候变化和高度严重的野火导致美国西南部树木普遍死亡,大大减少了支持火灾后森林和林地再生的种子来源。这对森林再生和受干扰地区对碳储存的潜在贡献都提出了挑战。种植树苗可以加速再造林和碳固存速度,但在半干旱的美国西南部,由于幼苗生长和存活率的信息有限,再造林的碳储存潜力尚不确定。我们调查了8个野火后再造林地点,并建立了异速生长方程,以预测碳固存作为直接测量幼苗大小的函数,并间接使用种植后的年份以及当前和未来的气候情景。我们的研究结果强调了种植后最初几年幼苗存活的关键作用,这极大地改变了碳储量的轨迹。未来的气候条件,其特征是低海拔地区的温度更高,可能会阻碍重新造林的努力,并降低这些地区的碳储存潜力。鉴于我们的研究结果,我们建议在野火后地区采取气候信息型种植策略,包括调整种植密度以最大限度地提高碳储量积累,同时确保未来的野火恢复能力。这项研究为旨在改善再造林成果的森林管理者提供了实际见解,特别是在我们面临气候变化挑战的情况下。
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引用次数: 0
Soil pH and alkaline phosphatase-harboring microorganisms closely link to available phosphorus dynamics of Cunninghamia lanceolata plantations 杉木人工林土壤pH和含碱性磷酸酶微生物与速效磷动态密切相关
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2026-01-17 DOI: 10.1016/j.foreco.2026.123530
Song Wang , Honggang Sun , Gongxiu He
Soil microorganisms play a pivotal role in regulating plant productivity and biogeochemical processes in forest ecosystems. Here, we investigated shifts in soil microbial community, chemical properties, and extracellular enzyme activities across a chronosequence of Cunninghamia lanceolata plantations aged 5–60 years. Our findings demonstrated that the Shannon diversity indices of both bacteria and fungi, along with the abundances of bacteria and fungi exhibited age-associated fluctuations. Fungal community composition exhibited differences between young with half-mature stages (5–20 years) and near-mature with mature stages (25–35 years), while that of bacteria displayed differences between young with half-mature stages (5–20 years) and overmature stages (41–60 years). Specifically, young and over-mature forests promoted oligotrophic and pathogenic taxa (i.e. class of Ustilaginomycetes and Dothideomycetes, and Chloroflexi phylum), while middle-aged stands enriched copiotrophic groups (i.e. phylum of Mortierellomycota and Rozellomycota). Except for soil pH, total nitrogen, and acid phosphatase, the variation ranges of soil nutrients and enzyme activities exceeded 50 % between the forest ages of 5 and 60 years. Soil factors including total phosphorus, pH, dissolved organic carbon, and NO3--N jointly explained 23.50 % and 17.52 % of the variations in bacterial and fungal communities, respectively. In addition, microbial network complexity and bacterial Shannon index exhibited a close relationship with soil available nitrogen and pH, respectively. The proposed mechanism suggests that the fluctuations in NH4+-N content driven by forest aging negatively influences soil pH, which subsequently lowers bacterial Shannon index and abundances of microorganisms secreting alkaline phosphatase, thereby reducing the availability of available phosphorus. Notably, natural understory colonization by broad-leaved trees shifted microbial communities to resemble those of 15-year-younger plantations, and their microbial community changes were closely related to dissolved organic carbon and Ascomycota phylum. Overall, our findings highlight stage-specific patterns in soil microbial diversity, abundance, and composition, which mediate nutrient transformations through distinct biogeochemical pathways in Cunninghamia lanceolata plantations.
土壤微生物在调节森林生态系统植物生产力和生物地球化学过程中起着关键作用。本文研究了杉木人工林5 ~ 60年树龄土壤微生物群落、化学性质和胞外酶活性的变化。研究结果表明,细菌和真菌的Shannon多样性指数以及细菌和真菌的丰度都呈现出与年龄相关的波动。真菌群落组成在半成熟期(5 ~ 20年)和近成熟期(25 ~ 35年)之间存在差异,细菌群落组成在半成熟期(5 ~ 20年)和过成熟期(41 ~ 60年)之间存在差异。具体而言,幼林和过成熟林促进了少营养和致病类群(即菇菌纲和多菌纲,以及绿菌门),而中年林分则丰富了共营养类群(即Mortierellomycota门和Rozellomycota门)。除土壤pH、全氮和酸性磷酸酶外,5 ~ 60年林龄土壤养分和酶活性的变化幅度均超过50% %。土壤因子包括全磷、pH、溶解有机碳和NO3—N分别解释了23.50% %和17.52% %的细菌和真菌群落变化。此外,微生物网络复杂性和细菌Shannon指数分别与土壤有效氮和pH密切相关。该机制表明,森林老化驱动的NH4+-N含量波动对土壤pH产生负面影响,进而降低细菌香农指数和分泌碱性磷酸酶的微生物丰度,从而降低有效磷的有效性。阔叶树自然定植林下的微生物群落向15年生林下相似,其微生物群落变化与溶解有机碳和子囊菌门密切相关。总体而言,我们的研究结果强调了杉木人工林土壤微生物多样性、丰度和组成的阶段性模式,这些模式通过不同的生物地球化学途径介导养分转化。
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引用次数: 0
How artificial drought generated by the Balbina hydropower dam has transformed the floristic structure of downstream floodplain forests 巴尔比纳水电站大坝造成的人工干旱是如何改变下游洪泛区森林的植物区系结构的
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2026-01-17 DOI: 10.1016/j.foreco.2025.123496
Carla Iara Dos Santos Dantas , Layon Oreste Demarchi , Florian Wittmann , Maria Teresa Fernandez Piedade , Giuliette Barbosa Mano , João Paulo Martins de Souza , Jochen Schöngart
The central Amazon basin has been affected by the two lowest water levels on instrumental records in 2023/2024, inducing severe hydrological droughts affecting human populations and floodplain ecosystems. However, the impacts of severe droughts on Amazonian floodplains are poorly studied. Here we investigate the extent of an artificial drought in the blackwater floodplains (igapó) downstream of the Balbina dam, caused by the damming of the Uatumã River to fill the reservoir in the period 1987–1989. Our hypothesis is that the severe prolonged hydrological drought conditions killed the igapó forests downstream the dam. Therefore, we established at regular fluvial distance of 10 ± 1 km a plot along the main course of the Uatumã River to analyze changes in floristic composition, diversity, structure and biomass of the igapó forests downstream of the Balbina dam. In 15 plots (total area 3,75 ha) a total of 2559 trees with diameter at breast height (DBH) ≥ 10 cm were inventoried, identified, and allometric equations were applied to estimate aboveground biomass. Based on floristic dissimilarity, a non-metric multidimensional scaling suggests two plot clusters, separated by the fluvial distance of about 120 km downstream of the dam. While the plot cluster close to the dam is characterized by a high abundance of resprouting trees and biomass of disturbance-indicator species, plot cluster 2 presents a higher species richness and basal area and is dominated by late-successional species. We discuss these findings in the background of increased frequency and magnitude of severe droughts in recent years and the planned hydropower plants which are threats for this ecosystems harboring an unique biodiversity.
亚马逊中部盆地在2023/2024年受到仪器记录中最低水位的影响,导致严重的水文干旱,影响人口和洪泛区生态系统。然而,严重干旱对亚马逊洪泛区的影响研究甚少。在这里,我们研究了1987-1989年期间Uatumã河筑坝填满水库造成的Balbina大坝下游黑水洪泛平原(igapó)人工干旱的程度。我们的假设是,长期严重的水文干旱条件杀死了大坝下游的igapó森林。因此,我们沿Uatumã河主河道在规则河流距离10 ± 1 km处建立了一个样地,分析了巴尔比纳大坝下游igapó森林的植物区系组成、多样性、结构和生物量的变化。在15个样地(总面积3,75 ha)共调查鉴定了胸径≥ 10 cm的树木2559株,并应用异速生长方程估算了地上生物量。基于植物区系差异,非度量多维尺度显示两个地块群,被大坝下游约120 km的河流距离隔开。靠近坝体的样地集群具有较高的再生树丰度和干扰指示物种生物量,而样地集群2具有较高的物种丰富度和基底面积,以晚演替物种为主。我们在近年来严重干旱的频率和程度增加的背景下讨论这些发现,以及计划中的水电站对这个拥有独特生物多样性的生态系统构成威胁。
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引用次数: 0
Morphological and heat-tolerance traits are associated with progression and impact of, but not vulnerability to, tree decline 形态和耐热性状与树木退化的进展和影响有关,但与树木退化的易损性无关
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2026-01-16 DOI: 10.1016/j.foreco.2026.123523
Sabina M. Aitken , Pieter A. Arnold , Matthew T. Brookhouse , Alicia M. Cook , Lisa M. Danzey , Rosalie J. Harris , Andy Leigh , Adrienne B. Nicotra
Warming and drying climate trends have been linked to tree-dieback phenomena worldwide with broad-reaching impacts on ecosystem services. Studying tree decline is unavoidably a retrospective exercise in which a challenge lies in determining whether trait values contribute to, or are consequences of, decline. Here we used sub-alpine snow gum (Eucalyptus pauciflora ssp. niphophila) to test whether plant traits explain vulnerability of individual trees to decline, assess how progression of dieback symptoms affect traits and physiological tolerance, and ask whether those responses could exacerbate decline. Snow gum woodlands are in widespread decline reflecting the compounding effects of climate warming and drought, and infestation by the wood-boring cerambycid, Phoracantha mastersi. While the impact of drought on tree mortality is well documented, we considered the potential role of heat stress, given exposure of high-elevation forests to increasing temperature. We measured changes in leaf and stem morphology, and stomatal anatomy across orthogonal dieback severity and elevation gradients. Trees showing severe dieback exhibited trait values indicating water stress, while less severely- and un-affected trees did not differ. This suggests observed differences are responses to stress caused by the impacts of wood-borer infestation and provide no evidence of underlying differences in vulnerability. We also modelled the viability of photosynthetic machinery in leaves under current and future climate scenarios; models indicated that leaves on severely-affected trees were likely to accumulate lethal damage to photosystems within a growing season. Even under the current thermal regime, dieback affected trees have lower capacity to tolerate compounded extreme events, contributing to a feedback cycle of decline.
气候变暖和干燥的趋势与全球范围内的树木枯死现象有关,并对生态系统服务产生广泛影响。研究树木的衰退不可避免地是一项回顾性的工作,其中的挑战在于确定性状值是否有助于衰退,或者是衰退的后果。本研究采用亚高山雪胶(Eucalyptus pauciflora ssp)。Niphophila)来测试植物性状是否解释单个树木对衰退的脆弱性,评估枯死症状的进展如何影响性状和生理耐受性,并询问这些反应是否会加剧衰退。雪胶林地正在广泛减少,这反映了气候变暖和干旱的综合影响,以及蛀木的天牛(Phoracantha mastersi)的侵扰。虽然干旱对树木死亡率的影响有很好的记录,但我们考虑了热应激的潜在作用,因为高海拔森林暴露于不断升高的温度。我们测量了叶片和茎的形态变化,以及在垂直枯病严重程度和海拔梯度上的气孔解剖。严重枯死的树木表现出的性状值表明水分胁迫,而不严重和未受影响的树木没有差异。这表明观察到的差异是对木蛀虫侵扰影响引起的压力的反应,并没有提供脆弱性潜在差异的证据。我们还模拟了当前和未来气候情景下叶片光合机制的生存能力;模型表明,在一个生长季节,受到严重影响的树木的叶子可能会对光系统造成致命的损害。即使在当前的热状态下,受影响的枯死树耐受复合极端事件的能力也较低,从而导致了退化的反馈循环。
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引用次数: 0
Quantifying post-fire live tree presence and spatial variation using Sentinel-2 time series 利用Sentinel-2时间序列量化火灾后活树的存在和空间变化
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2026-01-16 DOI: 10.1016/j.foreco.2025.123461
Saba J. Saberi , Phillip J. van Mantgem , Micah C. Wright , Christopher Y.S. Wong , Andrew M. Latimer , Derek J.N. Young
Accurate mapping of post-fire surviving trees is important for tracking forest recovery and prioritizing land management decisions. Satellite-based remote sensing is an effective method to assess post-fire forest conditions. Traditionally, differenced satellite-derived burn severity indices are computed by differencing one year pre- and post-fire spectral reflectance values. Differenced burn severity indices are useful for quantifying and mapping the magnitude of ecological change, but their application to detecting and mapping post-fire live trees may not be as appropriate, particularly for delayed tree mortality. Delayed tree mortality (“delayed mortality”) is a phenomenon where trees that initially survive fire then die over an extended period (between one and five years), and it can be challenging to measure and predict. In this study, we demonstrate the potential of mapping delayed mortality using readily available remotely sensed imagery alone. We used random forest models to detect post-fire live trees using 10-m resolution Sentinel-2 data at one-, three-, and five-years post-fire for four fires in the southern Sierra Nevada, California, USA. Using imagery from the National Agriculture Imagery Program (NAIP; 60-cm resolution), we manually classified live tree presence in 6000 Sentinel-2 pixels (500 pixels for each fire-year combination) to calibrate and validate models. Sentinel-2 based model accuracies ranged from 65 % to 86 % with F-scores ranging from 0.52 to 0.86, and their predictions of live pixel area were on average 44 % lower than inferred from more traditional indices such as relative differenced normalized burn ratio (RdNBR). This work represents a promising first step in using freely available post-fire spectral reflectance imagery to detect live trees over an extended period to support post-fire management.
准确绘制火灾后幸存树木的地图对于跟踪森林恢复和优先考虑土地管理决策非常重要。卫星遥感是评估火灾后森林状况的有效方法。传统上,通过区分火灾前后一年的光谱反射率值来计算卫星衍生的不同烧伤严重程度指数。不同的烧伤严重程度指数对于量化和绘制生态变化的大小是有用的,但它们在火灾后活树探测和绘制活树图方面的应用可能不合适,特别是对于延迟死亡的树木。树木延迟死亡(“延迟死亡”)是一种现象,即树木最初在火灾中幸存下来,然后在较长时间(1到5年)内死亡,这可能很难测量和预测。在这项研究中,我们证明了单独使用现成的遥感图像绘制延迟死亡率的潜力。我们使用随机森林模型,利用10米分辨率的Sentinel-2数据,在火灾后1年、3年和5年对美国加州内华达山脉南部的4次火灾进行检测。使用来自国家农业图像计划(NAIP; 60厘米分辨率)的图像,我们手动对6000个Sentinel-2像素的活树进行分类(每个5年组合500像素),以校准和验证模型。基于Sentinel-2的模型精度范围为65 %至86 %,f值范围为0.52至0.86,其对活像素面积的预测平均比传统指数(如相对差异归一化燃烧比(RdNBR))的预测低44 %。这项工作代表了利用免费的火灾后光谱反射图像来检测长时间活树以支持火灾后管理的有希望的第一步。
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引用次数: 0
Fine root vitality decline results in reduced branch formation in mature beech stands after drought 干旱后成熟山毛榉林分细根活力下降导致树枝形成减少
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2026-01-15 DOI: 10.1016/j.foreco.2026.123506
Alexandra Koller , Alina Azekenova , Karl-Heinz Feger , Karsten Kalbitz , Goddert von Oheimb
Climate change is deteriorating the health, growth and thus functioning and services of forests through ongoing droughts and an increase in the severity of these effects is predicted. Although fine roots can serve as an early indicator of drought stress, we still lack a basic understanding of how tree fine root vitality is reflected in aboveground tree morphology. Our study uses multitemporal fine root data obtained by sequential coring, as well as high-resolution tree crown data obtained by terrestrial laser scanning in mature European beech (Fagus sylvatica) stands. First, we assessed which fine root vitality traits are affected by drought, and second, evaluated the relationship between fine root vitality and crown vitality including trees within three different radial distances (5, 8 or 10 m) from the fine root sampling point. We found that fine root necromass, fine root biomass to necromass ratio and turnover were correlated with drought. Mainly fine roots in the upper 10 cm of soil affected the crown vitality of beech trees within a 5-m radius of the fine root sampling point, highlighting the tree-centred horizontal distribution of fine roots and shallow rooting pattern of beech. A decreased fine root vitality in the upper soil in the previous growing seasons led to decreased crown vitality. Including fine root inventories in forest monitoring protocols could substantially improve our understanding of the status and trends of forests and enable forest management to deal more effectively with the growing pressure on forests.
由于持续干旱,气候变化正在使森林的健康、生长、功能和服务恶化,预计这些影响的严重程度将会增加。虽然细根可以作为干旱胁迫的早期指标,但我们对树木细根活力如何反映在地上树木形态上仍然缺乏基本的了解。本研究采用时序取心法获取欧洲山毛榉(Fagus sylvatica)成熟林分的多时段细根数据,以及地面激光扫描获得的高分辨率树冠数据。首先,我们评估了哪些细根活力性状受到干旱的影响,其次,我们评估了细根活力与树冠活力之间的关系,包括距离细根采样点3个不同径向距离(5、8和10 m)内的树木。结果表明,细根坏死质量、细根生物量/坏死质量比和周转量与干旱有关。在细根采样点半径5 m范围内,土壤上部10 cm的细根主要影响山毛榉树冠活力,突出了细根以树为中心的水平分布和山毛榉的浅生根格局。前几个生长季节上层土壤细根活力下降导致树冠活力下降。在森林监测议定书中列入细根清单可以大大提高我们对森林状况和趋势的了解,并使森林管理能够更有效地处理对森林日益增长的压力。
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引用次数: 0
As forests reclaim the land: Latitudinal variations in carbon-biodiversity trade-offs under natural forest expansion in Italy 随着森林开垦土地:意大利天然林扩张下碳生物多样性权衡的纬度变化
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2026-01-15 DOI: 10.1016/j.foreco.2026.123527
Lorenzo Orzan , Antonio Tomao , Gabriele Antoniella , Gianmaria Bonari , Valentino Casolo , Tommaso Chiti , Paolo Cingano , Alessandro Foscari , Guido Incerti , Speranza Claudia Panico , Natalie Piazza , Giacomo Trotta , Giorgio Alberti
Spontaneous forest expansion following land abandonment can play a key role in achieving European targets for climate-change mitigation and biodiversity conservation. Understanding how biodiversity relates to carbon (C) stocks across successional stages can inform management strategies that simultaneously promote species diversity and C sequestration, thereby optimizing land use for ecosystem multifunctionality. We analysed 16 chronosequences spanning five successional stages, from meadows and pastures to mature forests (up to ∼75 years since abandonment), organized into four clusters along a latitudinal gradient in Italy, encompassing the Alpine, Continental, and Mediterranean biogeographical regions. We quantified vegetation, deadwood, and soil C pools and calculated diversity indices for herbaceous plant species. Linear and generalized linear mixed models were used to assess successional stage and site effects on C stocks and diversity indices. Total ecosystem C increased along succession, driven primarily by tree biomass, reaching 195–289 Mg C ha−1 in late-successional forests. Soil C showed no clear successional trend, with weak or site-specific patterns. Herbaceous species richness and diversity peaked in managed meadows/pastures and early encroachment stages but declined towards closed-canopy forests in three sites. By contrast, a U-shaped pattern emerged in the southernmost site. Consequently, the C–diversity relationship was predominantly negative, except for the non-linear response observed in the Mediterranean site. Overall, spontaneous reforestation promotes C storage but often reduce herbaceous plant diversity, revealing potential trade-offs between climate mitigation and plant diversity. However, under favourable environmental conditions, partial recovery of plant diversity in late-successional forests may occur, suggesting for win-win management policies.
在放弃土地后自发扩大森林,可在实现欧洲减缓气候变化和保护生物多样性的目标方面发挥关键作用。了解生物多样性与不同演替阶段碳(C)储量之间的关系,可以为同时促进物种多样性和碳封存的管理策略提供信息,从而优化土地利用,实现生态系统的多功能。我们分析了16个时间序列,跨越5个演替阶段,从草甸和牧场到成熟森林(遗弃后长达75年),沿着意大利的纬度梯度组织成4个集群,包括高山、大陆和地中海生物地理区域。我们量化了植被、枯木和土壤C库,并计算了草本植物物种的多样性指数。采用线性和广义线性混合模型评价演替阶段和场址效应对C种群和多样性指数的影响。生态系统总碳随演替而增加,主要受树木生物量的驱动,在演替后期森林达到195 ~ 289 Mg C ha - 1。土壤C的演替趋势不明显,表现出微弱的演替格局或特定的演替格局。3个样地草本物种丰富度和多样性在有管理的草甸/牧场和早期入侵阶段达到峰值,而在闭林阶段有所下降。相比之下,在最南端出现了u形图案。因此,c -多样性关系主要是负的,除了在地中海遗址观察到的非线性响应。总体而言,自发再造林促进了碳储存,但往往减少了草本植物多样性,揭示了减缓气候变化与植物多样性之间的潜在权衡。然而,在有利的环境条件下,晚演替林的植物多样性可能会出现部分恢复,建议采取双赢的管理政策。
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引用次数: 0
Corrigendum to “Native species seedlings in forest restoration in the Southern Amazon rapidly increase soil carbon stocks” [For. Ecol. Manage. 603 (2026) 123467] “亚马逊南部森林恢复中的本地物种幼苗迅速增加了土壤碳储量”的勘误表[For。生态。管理。603 (2026)123467]
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2026-01-15 DOI: 10.1016/j.foreco.2026.123526
Alexandre Ferreira do Nascimento , Ingo Isernhagen , Jorge Lulu , Antonio Okada , Jussane Antunes Fogaça dos Santos , Austeclínio Lopes de Farias Neto
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引用次数: 0
Retrospective long-term effects of halo thinning: Ground-cover vegetation diversity 20 years after remnant oak release 光晕间伐的回顾性长期影响:残栎树释放后20年的地被植被多样性
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2026-01-15 DOI: 10.1016/j.foreco.2026.123522
Agnese Anta Liepiņa, Diāna Jansone, Didzis Elferts, Jānis Donis, Zane Lībiete
Integrating biodiversity objectives into production forestry requires management practices that maintain structural and functional diversity over time. In hemiboreal regions, historical favouring of conifers has simplified forest composition, reducing broadleaved components crucial to understorey diversity. Selective canopy release through halo thinning has been proposed as a multifunctional approach to enhance habitat heterogeneity, yet its long-term ecological outcomes remain insufficiently quantified. This study retrospectively assessed canopy light conditions and forest ground-cover vegetation around halo-thinned pedunculate oak (Quercus robur L.) trees twenty years after the intervention in mixed hemiboreal forests of Latvia. Vegetation surveys and hemispherical canopy photography were conducted in the vicinity of 22 halo-thinned and 21 control oak trees across eight forest stands. Ground-cover vegetation structure beneath remnant oak trees was broadly comparable between managed and control plots, with no persistent differences in cover, richness, or diversity. Species associated with oak-dominated habitats likewise showed limited responses, indicating that targeted oak release alone was insufficient to recreate conditions characteristic of broadleaved forests. Notably, herb-layer richness showed no consistent relationship with stand basal area or gap fraction but was strongly associated with fine-scale canopy architecture, emphasising that foliage distribution, rather than overall stand openness, shaped long-term understorey responses. Overall, the findings suggest that small-scale halo thinning alone is unlikely to induce persistent shifts in understorey composition, but it may help maintain structural heterogeneity around remnant oaks. When integrated with broader or repeated interventions, halo thinning may contribute to multipurpose forestry strategies that reconcile oak conservation with production-oriented forest management.
将生物多样性目标纳入生产性林业需要长期保持结构和功能多样性的管理实践。在半北方地区,历史上对针叶树的偏爱简化了森林组成,减少了对林下多样性至关重要的阔叶成分。通过晕减薄的选择性冠层释放被认为是增强生境异质性的多功能方法,但其长期生态结果仍然缺乏足够的量化。本研究回顾性评估了拉脱维亚半北方混交林干预20年后冠层光照条件和有羽栎树(Quercus robur L.)周围的森林地被植被。在8个林分的22棵晕疏栎树和21棵对照栎树附近进行了植被调查和半半球冠层摄影。残余栎树下的地被植被结构在管理样地和对照样地之间具有大致可比性,在覆盖度、丰富度或多样性方面没有持续的差异。与橡树为主的栖息地相关的物种同样表现出有限的响应,这表明仅有针对性地释放橡树不足以重建阔叶林的特征条件。值得注意的是,草本层丰富度与林分基面积或林隙分数没有一致的关系,但与细尺度林冠结构密切相关,强调叶片分布而不是林分总体开度决定了林下植被的长期响应。总的来说,研究结果表明,单靠小规模的光晕变薄不太可能引起林下成分的持续变化,但它可能有助于维持残栎树周围的结构异质性。当与更广泛或重复的干预措施相结合时,光晕间伐可能有助于协调橡树保护与面向生产的森林管理的多用途林业战略。
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Forest Ecology and Management
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