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Cost- and biodiversity- “friendly” management: Evaluating conservation behaviors among Vermont maple syrup producers 成本和生物多样性“友好”管理:评估佛蒙特州枫糖浆生产商的保护行为
IF 2.9 Q1 FORESTRY Pub Date : 2026-03-01 Epub Date: 2026-03-09 DOI: 10.1016/j.tfp.2026.101223
Daniel F. Pratson , Rachelle K. Gould , Anthony W. D’Amato , Brendan Fisher
Privately owned forests comprise around 60% of the total forest cover across the contiguous United States and are managed for a range of economic outputs. Such private working forests contribute to large-scale conservation outcomes across the US and the globe. Voluntary conservation programs aim to motivate private forest owners to adopt biodiversity-focused management actions. However, it is often assumed that such management, and by extension, participation in programs, meaningfully increases financial costs borne by forest owners. Thus, these costs may preclude biodiversity-focused management across working forests. We use maple syrup production to test the claim that biodiversity-focused management incurs additional costs, especially for those enrolled in conservation programs. We analyzed reports of forest management actions, management costs, and conservation program enrollment among 70 individuals who manage 5,252 hectares of forest for maple syrup. Our core findings were that 1) most private forest owners engaged with several management actions linked to improved biodiversity outcomes, 2) there was no difference in management costs between those who implemented many “biodiversity friendly” management actions and those with fewer actions. Additionally, relationships between maple syrup yields and management costs did not differ across the number of management actions adopted, nor with producer enrollment in conservation programs. This finding suggests that the maple syrup industry, valued globally at $1.1 billion USD, could play a significant role in delivering habitat at minimal cost to producers. Beyond maple syrup, our study provides a backdrop for future work investigating the opportunity costs of biodiversity-focused forest management in working forests across the globe.
私人拥有的森林约占美国相邻地区森林总面积的60%,并为一系列经济产出而进行管理。这样的私人森林为美国乃至全球的大规模保护做出了贡献。自愿保护计划旨在激励私人森林所有者采取以生物多样性为重点的管理行动。然而,人们通常认为,这种管理,以及推广到项目的参与,会大大增加森林所有者承担的财务成本。因此,这些费用可能妨碍在整个工作森林中进行注重生物多样性的管理。我们用枫糖浆的生产来检验这样一种说法,即以生物多样性为重点的管理会产生额外的成本,特别是对那些参与保护计划的人来说。我们分析了管理5,252公顷枫糖浆森林的70个人的森林管理行动、管理成本和保护计划登记报告。我们的核心发现是:1)大多数私人森林所有者参与了几种与改善生物多样性结果相关的管理行动;2)那些实施了许多“生物多样性友好”管理行动的人和那些采取较少行动的人之间的管理成本没有差异。此外,枫糖浆产量和管理成本之间的关系并没有因采取的管理措施的数量而有所不同,也没有因生产者参与保护计划而有所不同。这一发现表明,全球价值11亿美元的枫糖浆产业可以在以最低成本为生产者提供栖息地方面发挥重要作用。除了枫糖浆之外,我们的研究还为未来在全球工作森林中调查以生物多样性为重点的森林管理的机会成本提供了背景。
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引用次数: 0
From access to action: Digital pathways to pro-environmental behaviors in smallholder agriculture through risk perception 从获取到行动:通过风险认知实现小农环保行为的数字途径
IF 2.9 Q1 FORESTRY Pub Date : 2026-03-01 Epub Date: 2026-03-09 DOI: 10.1016/j.tfp.2026.101224
Wei He
This study investigates the impact of household internet use on farmers' pro-environmental behaviors, with a specific focus on the mediating role of ecological risk perception and the heterogeneity of effects across different farmer subgroups in Southwest China. Utilizing data from the China Rural Revitalization Survey (CRRS) comprising 562 farming households, this research employs a Probit regression model to analyze the relationship between household internet use and PEBs. A mediation analysis framework is implemented to quantify the role of ecological risk perception, and heterogeneity tests are conducted to examine effect variations based on ethnicity, cooperative membership, green food knowledge, and food safety concern. The key findings are: 1. Household internet use exhibits a significantly positive effect on the adoption of PEBs. 2. Ecological risk perception acts as a partial mediator, confirming a significant cognitive pathway. 3. Pronounced effect heterogeneity is observed: the impact is significant for Han Chinese farmers but non-significant for ethnic minorities; it is stronger for non-members of agricultural cooperatives compared to members; and it is more substantial among farmers with prior knowledge of green food and those concerned about food safety. This study contributes to the theoretical framework of digital environmental governance by validating a mediated mechanism and provides evidence-based insights for designing targeted digital interventions to promote sustainable agricultural practices, particularly within the Global South context.
本研究探讨了家庭互联网使用对农户亲环境行为的影响,重点研究了生态风险感知的中介作用以及影响在西南地区不同农户亚群之间的异质性。本研究利用562户中国乡村振兴调查数据,采用Probit回归模型分析农户互联网使用与PEBs的关系。采用中介分析框架量化生态风险感知的作用,并通过异质性检验检验基于种族、合作成员、绿色食品知识和食品安全关注的影响差异。主要发现有:1。家庭互联网使用对peb的采用有显著的正向影响。2. 生态风险感知作为部分中介,证实了一个重要的认知途径。3. 效应异质性显著:汉族农户的影响显著,少数民族农户的影响不显著;非农业合作社成员比农业合作社成员的影响力更大;在对绿色食品有先验知识的农民和关心食品安全的农民中,这种情况更为严重。本研究通过验证一种中介机制,为数字环境治理的理论框架做出了贡献,并为设计有针对性的数字干预措施以促进可持续农业实践(特别是在全球南方背景下)提供了基于证据的见解。
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引用次数: 0
American graffiti: Spatial distribution and ecological consequences of aspen arborglyphs 美国涂鸦:白杨树纹的空间分布和生态后果
IF 2.9 Q1 FORESTRY Pub Date : 2026-03-01 Epub Date: 2026-02-13 DOI: 10.1016/j.tfp.2026.101188
James A. Lutz , Soren Struckman , Joseph D. Birch
Aspen (Populus tremuloides Michaux) is perhaps the most iconic tree species of the American West. The thin, white bark of aspen has long been a canvas for aspiring artists and those seeking to leave a mark on the wilderness. However, a question arises as to whether these carvings – or “arborglyphs” – damage aspen and either reduce growth or increase mortality. Here we leveraged a long-term, spatially mapped forest demography plot in Utah, USA, to investigate the spatial distribution of aspen arborglyphs in proximity to a trail and to assess differences in survival and growth between marked and unmarked trees.
Arborglyphs overwhelmingly (77%) consisted of names, initials, and dates, with the oldest arborglyph dating from 1887. We found that 75% of arborglyphs were within 20 m of the trail, primarily occurring on aspen of ≥ 20 cm diameter at breast height. Surprisingly, aspen with arborglyphs had 24% higher annual basal area increment and had no evidence of increased ten-year mortality rates, relative to aspen without arborglyphs. Cumulatively, our results suggest that individuals carving arborglyphs seek aspen canvases that are near the trail, have large diameter, and appear vigorous, which may explain why marked aspen had greater growth than unmarked aspen. Though we found no evidence in our study for a negative impact of arborglyphs on aspen, we caution that the creation of new arborglyphs likely poses a risk of injury and mortality to aspen over longer timescales.
白杨(Populus tremuloides Michaux)可能是美国西部最具代表性的树种。长久以来,白杨树薄而白的树皮一直是有抱负的艺术家和那些想在荒野上留下印记的人的画布。然而,一个问题出现了,这些雕刻-或“树雕”-是否损害白杨,要么减少生长,要么增加死亡率。在这里,我们利用了一个长期的、空间绘制的森林人口统计图,在美国犹他州,调查了白杨树在步道附近的空间分布,并评估了有标记和没有标记的树木在生存和生长方面的差异。绝大多数(77%)由名字、首字母和日期组成,最古老的树形文字可以追溯到1887年。研究发现,75%的树木分布在距山径20 m以内,主要分布在胸径直径≥20 cm的白杨上。令人惊讶的是,与没有树木砍伐的杨树相比,有树木砍伐的杨树的年基础面积增量高出24%,并且没有证据表明十年死亡率增加。总的来说,我们的研究结果表明,雕刻树雕的个体寻求靠近小径的白杨画布,直径大,看起来很有活力,这可能解释了为什么有标记的白杨比没有标记的白杨生长得更快。虽然我们在研究中没有发现树木对白杨有负面影响的证据,但我们警告说,在更长的时间尺度上,新的树木的产生可能会对白杨造成伤害和死亡的风险。
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引用次数: 0
Indigenous medicinal plant knowledge among the Meitei community of Salungpham village, Thoubal district, Manipur, India 印度曼尼普尔邦Thoubal区salungham村Meitei社区的土著药用植物知识
IF 2.9 Q1 FORESTRY Pub Date : 2026-03-01 Epub Date: 2026-02-13 DOI: 10.1016/j.tfp.2026.101193
Keithellakpam Ojit Singh , Khaidem Kennedy Singh , Ningombam Bishwamitra Singh , Nikki Konthoujam , Bhaskar Das , Tonjam Bidyasana Chanu , Biona Thokchom , Bunindro Nameirakpam , Shweta Rai , Neeta Pathaw , Oinam Shajan Singh , Bisheshwor Meitei Laishram , Pardeep Kumar Bhardwaj , Nanaocha Sharma
Indigenous knowledge of medicinal plants represents a vital resource for healthcare, cultural preservation, and scientific exploration. Passed down through generations, this knowledge remains integral to many communities around the world. In Salungpham village of Thoubal district, Manipur, the Meitei community maintains a rich heritage of using medicinal plants in their healing practices. Despite the spread of modern medicine, villagers continue to depend on these traditional remedies-much of which remain undocumented. This study records traditional medicinal practices by collecting ethnomedicinal data from informants in Salungpham village, Thoubal district, Manipur, through open-ended and semi-structured questionnaires. All the diseases and the treated ailments revealed by the informants were categorized according to the International Classification of Primary Care (ICPC-2). The ethnobotanical data were analysed using a variety of quantitative indices, including informant consensus factor (ICF), use value (UV). There were 130 medicinal plant species belonging to 114 genera and 58 families, mostly Lamiaceae and Zingiberaceae. The most widely used plant part was the leaf, and the most popular ways to use it were by oral administration and decoction. High ICF values indicated strong agreement on plant use against ailments, where the respiratory category had the highest ICF treated by 32 plant species with 587 use reports. Some of the high-use-value plant species are Alpinia galanga, Arundo donax, and Neptunia oleracea. This study highlights the continued reliance on medicinal plants and the importance of documenting these knowledge practices. It provides recognition and opens new avenues for pharmacological research for improved healthcare.
药用植物的本土知识是医疗保健、文化保护和科学探索的重要资源。代代相传,这种知识仍然是世界上许多社区不可或缺的一部分。在曼尼普尔邦Thoubal区的salungham村,Meitei社区保留了在治疗实践中使用药用植物的丰富遗产。尽管现代医学的普及,村民们仍然依赖于这些传统的治疗方法——其中很多都没有记录在案。本研究通过开放式和半结构化的问卷调查,从曼尼普尔邦Thoubal区salungham村的信息者那里收集民族医学数据,记录了传统医学实践。根据国际初级保健分类(ICPC-2),检出者所披露的所有疾病和治疗的疾病都进行了分类。使用多种定量指标对民族植物学数据进行分析,包括知情共识因子(ICF)、使用价值(UV)。共有药用植物130种,隶属于58科114属,以兰科和姜科为主。最广泛使用的植物部位是叶子,最流行的使用方式是口服和煎煮。较高的ICF值表明植物对疾病的利用具有很强的一致性,其中呼吸类植物在32种植物中具有最高的ICF,有587份使用报告。一些高利用价值的植物物种是高良姜、龙竹和水仙花。这项研究强调了对药用植物的持续依赖以及记录这些知识实践的重要性。它为改善医疗保健的药理学研究提供了认可和开辟了新的途径。
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引用次数: 0
Understanding community perceptions of forest ecosystem services to motivate REDD+ actions: A case study of Jalisco, Mexico 了解社区对森林生态系统服务的看法,以激励REDD+行动:以墨西哥哈利斯科州为例
IF 2.9 Q1 FORESTRY Pub Date : 2026-03-01 Epub Date: 2026-01-31 DOI: 10.1016/j.tfp.2026.101176
María Liliana Ávalos Rodríguez , Michael K. McCall , José Juan Alvarado Flores , Jorge Víctor Alcaraz Vera
This study aims to examine community perceptions of ECAs (Farmer Field Schools) in Jalisco, Mexico, to understand how participatory learning contributes to sustainable local practices and climate adaptation. FFS are bottom-up learning models that test, validate, and integrate local knowledge and external scientific ideas are tested, validated, and integrated within the context of the local ecosystem and community-based problem analysis. They can be supported by the MESMIS (Framework for the Evaluation of Natural Resource Management Systems Incorporating Sustainability Indicators), because both share the same agroecological principles based on participation and sustainability. To achieve the objective of this study, a survey with structured and semi-structured questions was administered to a population representing only 20% of the sample obtained, so the results are partial but offer important insights into ECAs in the study area. The main findings indicate that communities perceive ECAs as spaces where they can develop and reinforce their experiences and interests to achieve improvements in production, silvopastoralism, animal health, and agroforestry systems, among others. In addition, it was observed that MESMIS allows for the participatory evaluation of sustainable practices in communities, and both models provide findings for understanding the complexity of agroecological systems, from local understanding to the effects of that understanding on sustainability. This study has practical implications because it analyzes shared and improved experiences in livelihoods based on a learning field system that has generated local benefits. It also provides valuable findings on the benefits of participating in a learning field system based on sustainability indicators that can be replicated in other areas with similar characteristics in the future.
本研究旨在调查墨西哥哈利斯科州社区对农民田间学校(ECAs)的看法,以了解参与式学习如何促进可持续的地方实践和气候适应。FFS是一种自下而上的学习模式,可以在当地生态系统和基于社区的问题分析的背景下测试、验证和整合当地知识和外部科学思想。它们可以得到MESMIS(包含可持续性指标的自然资源管理系统评价框架)的支持,因为它们具有基于参与和可持续性的相同农业生态原则。为了实现本研究的目标,对仅占所获得样本20%的人群进行了结构化和半结构化问题的调查,因此结果是部分的,但为研究领域的eca提供了重要见解。主要研究结果表明,社区将eca视为可以发展和加强其经验和兴趣的空间,以实现生产、森林畜牧业、动物健康和农林系统等方面的改进。此外,有人指出,MESMIS允许对社区的可持续做法进行参与性评价,两种模式都提供了了解农业生态系统复杂性的结果,从当地的了解到这种了解对可持续性的影响。这项研究具有实际意义,因为它分析了在产生当地效益的学习现场系统基础上分享和改进的生计经验。它还就参与基于可持续性指标的实地学习系统的好处提供了宝贵的发现,这些发现今后可在具有类似特点的其他领域复制。
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引用次数: 0
The canopy and the community: Quantifying the disparity of urban forest benefits and vulnerability in Maryland 林冠与群落:量化马里兰州城市森林效益与脆弱性的差异
IF 2.9 Q1 FORESTRY Pub Date : 2026-03-01 Epub Date: 2026-02-07 DOI: 10.1016/j.tfp.2026.101182
Ian Kalama, Stephanie Stotts
Urban forests deliver essential ecosystem services, such as carbon storage, air-pollution removal, and stormwater regulation, that support environmental quality and public health. Yet these benefits are unevenly distributed, exacerbating inequities between high- and low-vulnerability communities. The primary goal of this study was twofold: (1) to quantify the tract-level distribution of key urban forest ecosystem services (ES) across Maryland's 34 urban areas, and (2) to statistically evaluate the extent to which their provision is tied to social vulnerability. Using GIS-based spatial analysis, i-Tree Landscape estimates, and 2020 U.S. Census tract boundaries, we mapped tree canopy cover, carbon storage and sequestration, air-pollution removal, transpiration, rainfall interception, and avoided runoff (volume and value). Social vulnerability classifications were derived from Social Vulnerability Index (SVI) metrics based on U.S. Census Bureau’s Community Resilience Estimates (CRE). Disparities were quantified using Kruskal–Wallis and Tukey’s post-hoc tests to compare ES provision across three CRE vulnerability classes. Results indicate that low-vulnerability communities consistently exhibit higher tree canopy cover and greater ecosystem service benefits, while highly vulnerable communities experience reduced canopy cover and diminished access to these services. Significant associations between SVI metrics and ES distribution highlight persistent socio-environmental disparities in urban forestry. These findings demonstrate unequal distribution of ecosystem service provision, with the most vulnerable communities receiving the fewest benefits. This tract-level framework provides a replicable and scalable tool for assessing equity in urban forest benefits, supporting prioritization of urban greening investments, equitable strategies, and policy interventions aimed at promoting more inclusive resilient urban landscapes and restoring ecosystem benefits.
城市森林提供基本的生态系统服务,如碳储存、空气污染清除和雨水调节,从而支持环境质量和公众健康。然而,这些利益分配不均,加剧了高脆弱性社区和低脆弱性社区之间的不平等。本研究的主要目标有两个:(1)量化马里兰州34个城市地区关键城市森林生态系统服务(ES)的区域分布;(2)统计评估其提供与社会脆弱性的联系程度。利用基于gis的空间分析、i-Tree景观估算和2020年美国人口普查区边界,我们绘制了树冠覆盖、碳储存和固存、空气污染去除、蒸腾、降雨拦截和避免径流(体积和价值)。社会脆弱性分类来源于基于美国人口普查局社区恢复力估算(CRE)的社会脆弱性指数(SVI)指标。使用Kruskal-Wallis和Tukey的事后测试对差异进行量化,以比较三个CRE漏洞类别的ES供应。结果表明,低脆弱性群落表现出较高的冠层覆盖度和更大的生态系统服务效益,而高度脆弱性群落则表现出冠层覆盖度减少和生态系统服务的获取减少。SVI指标与ES分布之间的显著关联突出了城市林业中持续存在的社会环境差异。这些发现表明,生态系统服务提供的分配不平等,最脆弱的社区获得的利益最少。该框架提供了一个可复制和可扩展的工具,用于评估城市森林效益的公平性,支持城市绿化投资的优先排序、公平战略和旨在促进更具包容性的弹性城市景观和恢复生态系统效益的政策干预。
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引用次数: 0
Spatiotemporal analysis of forest cover change in southwestern Ethiopia: revealing degradation pathways and management implications 埃塞俄比亚西南部森林覆盖变化的时空分析:揭示退化途径和管理意义
IF 2.9 Q1 FORESTRY Pub Date : 2026-03-01 Epub Date: 2026-02-09 DOI: 10.1016/j.tfp.2026.101181
Andualem Mulatu Aga , Mitiku Badasa Moisa , Ababo Workineh Tadesse , LI Jing
Forest degradation has emerged as a critical environmental challenge in many tropical regions, driven by agricultural expansion, population pressure, and unsustainable land-use practices, resulting in biodiversity loss and ecosystem instability. Accordingly, this study examines the spatiotemporal dynamics of forest cover change using GIS and remote sensing techniques in Buno Bedele and Ilu Ababor Zones, southwestern Ethiopia. For this study, Landsat ETM+ of 2003 ETM+ of 2013 and OLI/TIRS of 2023 were used. Potential Land use and land cover (LULC) types of the study area were classified using a supervised classification approach with the maximum likelihood algorithm. The result revealed that, a significant decrease in both dense forest cover and sparse forest cover by 4% and 3.3% respectively, from 2003 to 2023. In contrast, cultivated land expanded considerably during the same period, rising with 5.7% over the study period. This indicates that agricultural expansion is the leading cause of deforestation in the study area. Furthermore, the LULC conversion analysis reveals that nearly 60% of dense forest loss occurred through degradation into sparse forest before being converted into agricultural land, highlighting a critical forest degradation pathway. Therefore, the finding underscore the urgent need for effective and targeted land use policies to promote sustainable forest management and to establish land-use zoning strategies to mitigate on going land degradation and enhance resilience against future disturbances.
在农业扩张、人口压力和不可持续的土地利用做法的推动下,森林退化已成为许多热带地区的一个重大环境挑战,导致生物多样性丧失和生态系统不稳定。因此,本研究利用GIS和遥感技术研究了埃塞俄比亚西南部Buno Bedele和Ilu Ababor地区森林覆盖变化的时空动态。本研究使用2003年的Landsat ETM+, 2013年的ETM+和2023年的OLI/TIRS。利用最大似然算法对研究区潜在土地利用和土地覆盖类型进行了监督分类。结果表明:2003 - 2023年,林下茂密森林和稀疏森林分别减少了4%和3.3%;相比之下,耕地面积在同一时期大幅扩大,在研究期间增加了5.7%。这表明农业扩张是研究区森林砍伐的主要原因。此外,LULC转换分析显示,近60%的密林损失是在转化为农用地之前通过退化成疏林发生的,这凸显了森林退化的关键途径。因此,这一发现强调了迫切需要制定有效和有针对性的土地利用政策,以促进可持续森林管理,并建立土地利用分区战略,以减轻正在发生的土地退化,增强对未来干扰的抵御能力。
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引用次数: 0
Cultivation practices, socioeconomic contributions, and challenges of Moringa stenopetala in Southern Ethiopia: A systematic review 埃塞俄比亚南部辣木的种植实践、社会经济贡献和挑战:系统综述
IF 2.9 Q1 FORESTRY Pub Date : 2026-03-01 Epub Date: 2026-03-04 DOI: 10.1016/j.tfp.2026.101219
Workalemahu Tsegaye , Yishak Adgo Kassie
Moringa stenopetala is a fast-growing, drought-tolerant, multipurpose indigenous tree species that plays a critical role in food security, nutrition, income generation, and traditional medicine in southern Ethiopia. The species is particularly important in semi-arid areas where alternative food sources are limited during prolonged dry seasons. Despite its socioeconomic and ecological importance, Moringa stenopetala has received limited scientific and policy attention compared to other Moringa species, particularly Moringa oleifera. This systematic review synthesizes existing literature on cultivation practices, processing methods, socioeconomic contributions, and major challenges associated with Moringa stenopetala in southern Ethiopia. Peer-reviewed journal articles, theses, and institutional reports published between 2000 and 2024 were reviewed using Scopus, Web of Science, and Google Scholar databases. The review indicates that Moringa stenopetala is well adapted to semi-arid environments and contributes significantly to household nutrition, income generation, livestock feed, and cultural practices. However, insect pests, limited processing technologies, weak market access, and inadequate institutional support remain major constraints to its wider utilization.
辣木(Moringa stenopetala)是一种快速生长、耐旱、多用途的本土树种,在埃塞俄比亚南部的粮食安全、营养、创收和传统医学方面发挥着关键作用。该物种在半干旱地区尤其重要,因为在长时间的干旱季节,可供选择的食物来源有限。尽管辣木具有重要的社会经济和生态意义,但与其他辣木品种相比,辣木受到的科学和政策关注有限,特别是辣木。本系统综述综合了有关埃塞俄比亚南部辣木种植实践、加工方法、社会经济贡献和主要挑战的现有文献。通过Scopus、Web of Science和谷歌Scholar数据库对2000年至2024年间发表的同行评议的期刊文章、论文和机构报告进行了审查。该综述表明,辣木很好地适应半干旱环境,对家庭营养、创收、牲畜饲料和文化习俗有重要贡献。然而,害虫、加工技术有限、市场准入薄弱和体制支持不足仍然是制约其广泛利用的主要因素。
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引用次数: 0
Ecological niche dynamics of treeline birches (Betula spp.) under pleistocene - holocene - future climate change in the Caucasus 高加索地区更新世-全新世-未来气候变化下的桦树生态位动态
IF 2.9 Q1 FORESTRY Pub Date : 2026-03-01 Epub Date: 2026-02-13 DOI: 10.1016/j.tfp.2026.101192
Ilia Akobia , Vasil Metreveli , Ketevan Ugrekhelidze , Ketevan Batsatsashvili , Zurab Javakhishvili , Nugzar Zazanashvili
Treeline birches (Betula spp.) are key components of subalpine forests in the Caucasus, providing important ecosystem services but facing growing threats from climate change. We applied ecological niche modeling (Maximum Entropy – MaxEnt) to assess birch habitat dynamics across multiple temporal scales: the Last Glacial Maximum (LGM), the Mid-Holocene (MH), the present and future projections for 2100 under three Shared Socioeconomic Pathways (SSP126, SSP370, SSP585), using MIROC and CMCC-ESM2 climate models. Model performance was high (Area Under the Curve (AUC) > 0.97). Thermal variables, particularly the mean temperature of the warmest (Bio10) and coldest (Bio11) quarters, were the dominant predictors, complemented by seasonal precipitation (Bio18, Bio19). Paleoclimatic reconstructions showed confinement to refugial areas in Colchis and Hyrcania during the LGM, with expansion during the wetter Mid-Holocene. Present conditions represent the ecological optimum, supporting continuous treeline belts along the Greater Caucasus and fragmented patches in the Lesser Caucasus. Future projections revealed strong scenario-dependent shrinkages: SSP126 maintained relative stability, whereas SSP370 and SSP585 indicated losses exceeding 80-95%, leaving only small, isolated refugia at high elevations. These results demonstrate a refugia – recolonization – optimum – shrinkage trajectory and identify the Caucasus ecoregion as both a long-term refugial zone and a climate-sensitive hotspot. Conservation strategies should prioritize refugial strongholds, ecological connectivity and climate-adaptive management to safeguard birch treelines under future climate warming.
桦树(Betula spp.)是高加索亚高山森林的重要组成部分,提供重要的生态系统服务,但面临越来越大的气候变化威胁。利用MIROC和ccc - esm2气候模型,应用生态位模型(Maximum Entropy - MaxEnt)评估了白桦树栖息地在末次极大冰期(LGM)、中全新世(MH)、三种共享社会经济路径(SSP126、SSP370、SSP585)下2100年的现状和未来动态。模型性能高(曲线下面积(AUC) > 0.97)。热变量,特别是最热(Bio10)和最冷(Bio11)季度的平均温度是主要预测因子,季节性降水(Bio18, Bio19)是补充。古气候重建显示,在LGM时期,Colchis和hycania的避难区受到限制,而在湿润的中全新世时期则有所扩大。目前的条件代表了生态的最佳状态,支持大高加索地区连续的树木线带和小高加索地区破碎的斑块。未来的预测显示出强烈的情景依赖收缩:SSP126保持相对稳定,而SSP370和SSP585的损失超过80-95%,只留下小的,孤立的避难所在高海拔地区。这些结果显示了一个避难-再殖民化-优化-收缩的轨迹,并确定高加索生态区既是一个长期的避难区,也是一个气候敏感热点。在未来气候变暖的背景下,保护桦树应优先考虑庇护据点、生态连通性和气候适应性管理。
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Current status and threatening factors of the critically endangered mangrove fern Acrostichum speciosum in China 中国极度濒危红树蕨类植物Acrostichum speciosum的现状及威胁因素
IF 2.9 Q1 FORESTRY Pub Date : 2026-03-01 Epub Date: 2026-02-07 DOI: 10.1016/j.tfp.2026.101177
Bingyan Guo , Hongjuan Zhu , Wending Zeng , Manman Chen , Xialan Cheng , Yougen Wu , Ya Liu , Jing Yu , Dongmei Yang
Acrostichum speciosum, a critically endangered mangrove fern in China, faces severe population decline with poorly understood mechanisms. We combined field quadrat surveys, reproductive experiments, and genotyping-by-sequencing across its Chinese range to investigate its community ecology, population structure, and genetic diversity. The species inhabits species-poor communities, though Zhanjiang supported higher diversity than Wenchang. While population structures were stable, regeneration was limited by scarce juveniles. The Zhanjiang population demonstrated superior density, cover, and vigor. The fern exhibits slow growth, high disease susceptibility, and critically low reproductive efficiency—evidenced by minimal spore germination (3.78%), low seedling establishment (6.38%), and prolonged gametophyte development (240 days). Genetically, populations were significantly differentiated. Despite high overall diversity and heterozygote excess, nucleotide diversity positively correlated with community diversity, and both were reduced by human activities. We conclude that anthropogenic pressures, combined with intrinsically low reproductive efficiency and slow regeneration, drive its endangerment. Conservation should prioritize the robust Zhanjiang population, minimize anthropogenic disturbance in Wenchang, and enhance gene flow through assisted introduction and rapid propagation techniques.
中国濒临灭绝的红树蕨类植物棘顶蕨(Acrostichum speciosum)种群数量急剧下降,但机制尚不清楚。通过野外样方调查、繁殖实验和基因分型测序等方法,对其群落生态、种群结构和遗传多样性进行了研究。该物种生活在物种贫乏的群落中,但湛江的多样性高于文昌。虽然种群结构稳定,但由于幼体稀少,种群更新受到限制。湛江的人口密度、覆盖率和活力均较强。该蕨类植物生长缓慢,疾病易感,繁殖效率极低,孢子萌发率低(3.78%),幼苗成活率低(6.38%),配子体发育时间长(240天)。遗传上,种群分化显著。尽管总体多样性较高,杂合子过多,但核苷酸多样性与群落多样性正相关,且两者均因人类活动而降低。我们的结论是,人为的压力,加上固有的低繁殖效率和缓慢的再生,导致了它的濒危。保护应优先考虑健壮的湛江种群,尽量减少文昌的人为干扰,并通过辅助引种和快速繁殖技术加强基因流动。
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Trees, Forests and People
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