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Rational eucalypt logging site management patterns enhance soil phosphorus bioavailability and reshape phoD-harboring bacterial community structure 合理的桉树采伐场管理模式可提高土壤磷的生物有效性,重塑土壤磷寄存菌群落结构
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2024-11-30 DOI: 10.1016/j.foreco.2024.122434
Yuxing Xu, Chao Li, Zhichao Wang, Runxia Huang, Apeng Du, Wankuan Zhu
Continuous planting of eucalypt plantations negatively affects soil nutrient effectiveness, especially soil phosphorus (P) availability. Therefore, exploring the response characteristics of soil P-mineralising microbial communities and the distribution mechanism of soil P fractions under different transformation patterns on eucalypts logging sites holds great practical significance for improving soil nutrient effectiveness in plantations. This experiment investigated the effects and correlations between four different transformation patterns on soil phoD-harboring bacterial communities, alkaline phosphatase (ALP) activity, and P fractions. Management patterns mainly included non-forest area formed upon eucalypt stump germination suppression after two generations of Eucalyptus afforestation (TWE), the third generation of pure plantation planting (THE), mixing of Eucalyptus with Manglietia glauca (EM), and rotation of pure M. glauca plantation (MM), with previous mixed coniferous and broadleaf forest (CK) as the control. The results showed that, TWE and THE significantly reduced soil (0–10 cm and 10–20 cm) organic carbon (SOC), total nitrogen (TN), bioavailable P, and labile Po, and increased the occluded P and ALP activity compared to CK; however, SOC, TN, bioavailable P, and labile Po indices improved in plantations of EM or MM compared to TWE and THE. Meanwhile, the four management patterns on the logging site caused significant differences in phoD gene community structure and diversity. TWE and THE significantly increased the relative abundances (RAs) of Pseudomonadaceae and Comamonadaceae, which correlated negatively with soil bioavailable P and HCl-P and positively with ALP activity, suggesting a positive effect on Po mineralization and insoluble P mobilization. In contrast, Streptomycetaceae and Oxalobacteraceae were significantly enriched in EM or MM, implying that not all microorganisms carrying phoD genes play important roles in synthesizing ALP. The structure equation model showed that TN, resin-Pi, NaHCO3-Pi, and HCl-P had indirect effects on ALP through phoD-harbouring bacterial diversity and community composition. These findings provide a basis for understanding the soil P cycling mechanism after eucalypt plantations logging site transformation.
桉树人工林的连作对土壤养分有效性,尤其是磷有效性有负面影响。因此,研究桉树采伐场不同转化模式下土壤磷矿化微生物群落的响应特征和土壤磷组分的分布机制,对提高人工林土壤养分有效性具有重要的现实意义。本试验研究了4种不同转化方式对土壤有机磷细菌群落、碱性磷酸酶(ALP)活性和磷组分的影响及其相关性。经营模式主要包括两代桉树造林(TWE)后桉树树桩发芽抑制形成的非林区、第三代纯人工林种植(the)、桉树与青木混交(EM)、青木纯人工林轮作(MM),原针叶林与阔叶林混交林(CK)为对照。结果表明:与对照相比,TWE和The显著降低了土壤(0-10 cm和10-20 cm)有机碳(SOC)、全氮(TN)、生物有效磷和活性磷(Po),提高了封闭磷和ALP活性;EM和MM处理的土壤有机碳、全氮、生物有效磷和活性磷指数均高于TWE和TWE。同时,4种伐地管理模式在phoD基因群落结构和多样性上存在显著差异。TWE和THE显著提高了假单胞菌科和绿单胞菌科植物的相对丰度(RAs), RAs与土壤生物有效磷和HCl-P呈负相关,与ALP活性呈正相关,表明其对Po矿化和不溶性磷的动员有积极作用。相比之下,链霉菌科和草藻科的EM或MM显著富集,这表明并非所有携带phoD基因的微生物都在合成ALP中发挥重要作用。结构方程模型表明,TN、resin-Pi、NaHCO3-Pi和HCl-P通过寄存phod的细菌多样性和群落组成间接影响ALP。这些研究结果为了解桉树人工林采伐后土壤磷循环机制提供了依据。
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引用次数: 0
Long-term impacts of nurse plants on evergreen and deciduous oak saplings in Northern California 护理植物对北加州常绿和落叶栎树幼苗的长期影响
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2024-11-30 DOI: 10.1016/j.foreco.2024.122426
Chrysanthe Frangos , Rodolfo Dirzo , Marta Peláez
Throughout California, oak savannas exhibit poor recruitment of saplings in natural populations. To prevent the decline of California oak (Quercus spp.) populations, management practices need to elucidate the drivers of recruitment limitations. Previous research suggests that nurse plants enhance the establishment of oaks by buffering them from stressors such as insolation and herbivory. However, their long-term effects on sapling performance remain poorly known. Here we explore the differential impacts of nurse plants on the growth and distribution of sympatric evergreen and deciduous oak species. We compared all naturally occurring saplings found underneath and around nurse plants in two environments with contrasting densities of herbivorous mule deer (Odocoileus hemionus) in 2015 and 2023. The nurse plants and oaks observed in 2015 were located and evaluated after eight years, along with all new oak saplings recruited between 2015 and 2023. We uncovered that beneficiary oaks protected by nurse plants had greater height growth compared to those exposed in the open. Additionally, increased herbivory stress is associated with a shift in the distribution of beneficiaries underneath the nurse plant, favoring recruitment closer to the nurse plant’s center. We conclude that nurse plants are only beneficial to the long-term growth of oak saplings under high herbivory scenarios. As nurse plants are not as effective facilitators for deciduous species compared to evergreen ones, further research devoted to management solutions for deciduous oak species is warranted.
在整个加州,橡树稀树草原表现出幼树在自然种群中的招募不足。为了防止加利福尼亚栎(栎科)种群的减少,管理实践需要阐明招养限制的驱动因素。先前的研究表明,护理植物通过缓冲日晒和草食等压力源来促进橡树的生长。然而,它们对树苗性能的长期影响仍然知之甚少。本文探讨了护林植物对同域常绿栎树和落叶栎树生长和分布的差异影响。我们比较了2015年和2023年草食性骡鹿(Odocoileus hemionus)密度不同的两种环境中在护理植物下面和周围发现的所有自然树苗。2015年观察到的护理植物和橡树在8年后被定位和评估,以及2015年至2023年期间招募的所有新橡树树苗。我们发现,受护理植物保护的受益橡树比暴露在露天的橡树有更高的高度生长。此外,草食压力的增加与护理植物下方受益人分布的变化有关,有利于靠近护理植物中心的招募。我们得出结论,护理植物只有在高草食环境下才有利于橡树幼苗的长期生长。与常绿植物相比,护理植物对落叶树种的促进作用不如常绿植物,因此有必要进一步研究落叶栎树种的管理解决方案。
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引用次数: 0
Contrasting responses of bats and macro-moths to structural complexity in forest borders 蝙蝠和飞蛾对森林边界结构复杂性的反应对比
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2024-11-30 DOI: 10.1016/j.foreco.2024.122416
Heather Wood , Adam Kimberley , Sara A.O. Cousins
Habitat fragmentation increases the proportion of forest borders in the landscape and many forest borders lose their structural complexity due to modern forestry practices. However, remnants of structurally complex deciduous forests can remain as ecotones between plantations and agricultural fields. In this study we used terrestrial laser scanning to measure structural complexity of different forest borders, measured microclimate, and surveyed bats and macro-moths to understand how these taxa are affected. Our aim is to disentangle the main drivers, direct or indirect, that influence bat and moth assemblages. We studied 79 forest borders, and surrounding landscapes and compared them with adjacent agricultural fields and coniferous plantations. Overall, we found less bat activity and lower macro-moth diversity in simple compared to complex borders. Using structural equation modelling, we show the contrasting responses of forest-specialist bats and moths to structural complexity; with bats responding positively and moths negatively. We found similar divergent results in relation to understorey openness; with increasing forest-specialist bat activity but a lower diversity of forest-specialist moths in more open borders. Understorey vegetation also appears to regulate microclimate with more open borders being warmer and less humid. This has a potential knock-on effect for bats as they favoured borders that were warmer and more humid. Surrounding land-cover was more important than structural complexity for generalist species; with increasing generalist bat activity due to a higher proportion of local deciduous forest cover and increasing generalist moth diversity in landscapes with more forest borders. Overall, these complex relationships between forest structure, microclimate and landscape factors, coupled with divergent responses of both taxa highlight their diverse ecological needs. Therefore, we highlight the importance of managing forest borders to retain complexity and connectivity within multifunctional landscapes.
生境破碎化增加了森林边界在景观中的比例,由于现代林业实践,许多森林边界失去了其结构复杂性。然而,结构复杂的落叶森林的残余物可以作为人工林和农田之间的过渡带保留下来。在本研究中,我们利用陆地激光扫描测量了不同森林边界的结构复杂性,测量了小气候,并对蝙蝠和巨蛾进行了调查,以了解这些分类群是如何受到影响的。我们的目的是解开主要驱动因素,直接或间接,影响蝙蝠和蛾的组合。我们研究了79个森林边界及其周围景观,并将其与邻近的农田和针叶人工林进行了比较。总体而言,与复杂边界相比,我们发现简单边界的蝙蝠活动较少,大蛾多样性较低。利用结构方程模型,我们展示了森林专家蝙蝠和飞蛾对结构复杂性的对比反应;蝙蝠的反应是积极的,飞蛾的反应是消极的。我们在下层开放度方面发现了类似的不同结果;随着森林专家蝙蝠活动的增加,但在更开放的边界,森林专家飞蛾的多样性较低。下层植被似乎也调节着小气候,越开放的边界越温暖,湿度越低。这对蝙蝠有潜在的连锁反应,因为它们喜欢更温暖、更潮湿的边界。对于多面手物种,周围土地覆盖比结构复杂性更重要;在森林边界较多的景观中,由于当地落叶森林覆盖率的增加,一般蛾的活动增加,一般蛾的多样性增加。总体而言,森林结构、小气候和景观因子之间的复杂关系,加上两个类群的不同响应,凸显了它们不同的生态需求。因此,我们强调管理森林边界的重要性,以保持多功能景观的复杂性和连通性。
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引用次数: 0
Multi-scale forest heterogeneity promotes occupancy of dusky-footed woodrats in the Sierra Nevada 内华达山脉多尺度森林异质性促进了暗足木鼠的占据
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2024-11-30 DOI: 10.1016/j.foreco.2024.122412
Corbin C. Kuntze , Jonathan N. Pauli , John J. Keane , Kevin N. Roberts , Brian P. Dotters , H. Anu Kramer , M. Zachariah Peery
Forested landscapes are naturally heterogeneous, with the distribution of resources influencing animal habitat selection at multiple spatial scales. However, anthropogenic activities and changing disturbance regimes have reorganized how forests are structured from fine- to landscape-scales, generally with unknown consequences for forest-associated wildlife. For instance, fire suppression and selective logging in the western US has led to more homogeneous forests with fewer small patches of early-successional vegetation. As forest management aims to improve forest resilience to extreme fire and drought by restoring historical disturbance regimes and modifying forest structure through fuel management, there is a need for studies that evaluate how animals respond to forest heterogeneity at multiple scales. Here, we estimated occupancy for the dusky-footed woodrat (Neotoma fuscipes), an important prey species for many forest predators including the California spotted owl (Strix occidentalis occidentalis), relative to forest structure and composition at site-, patch-, and landscape-scales within landscapes where forest heterogeneity was created by even-aged timber management. Woodrats were more likely to occupy sites with greater canopy cover, understory cover, and hardwoods – particularly tanoak (Notholithocarpus densiflorus) – and smaller patches of young forest. Woodrats were also more likely to occupy mature forests in close proximity to younger forests, suggesting that young forest patches with more favorable local conditions can produce populations that recruit into adjacent, lower-quality mature forests. Our results suggest that creating small (∼2 ha) patches of high-quality woodrat habitat (i.e., young forests with dense understory and hardwoods) could provide “fishing holes” for spotted owls and other predators by supporting higher woodrat densities in surrounding mature forests managed for fuels – thus helping to meet both spotted owl conservation and forest resilience objectives. More broadly, we highlight the benefits of multi-scale studies and demonstrate that restoring landscape heterogeneity, including the creation of small early-successional forests, may benefit species conservation without compromising efforts to improve resilience in forest ecosystems globally.
森林景观具有天然的异质性,其资源分布在多个空间尺度上影响着动物栖息地的选择。然而,人为活动和不断变化的干扰制度已经重新组织了森林的结构,从精细尺度到景观尺度,通常对森林相关的野生动物产生未知的后果。例如,美国西部的灭火和选择性砍伐导致了更均匀的森林,更少的小块早期演替植被。由于森林管理旨在通过燃料管理恢复历史干扰制度和改变森林结构,从而提高森林对极端火灾和干旱的抵御能力,因此有必要开展研究,评估动物如何在多尺度上对森林异质性作出反应。在这里,我们估计了暗足木鼠(Neotoma fuscipes)的占用率,它是包括加利福尼亚斑点猫头鹰(Strix occidentalis occidentalis)在内的许多森林捕食者的重要猎物,相对于场地尺度、斑块尺度和景观尺度上的森林结构和组成,其中森林异质性是由均匀年龄的木材管理造成的。木鼠更有可能占据有更大的树冠覆盖、林下覆盖和硬木的地方——尤其是橡树(Notholithocarpus densiflorus)——和小块的幼林。木鼠也更有可能占据靠近年轻森林的成熟森林,这表明当地条件更有利的年轻森林斑块可以产生种群,招募到邻近的低质量成熟森林。我们的研究结果表明,创造小块(~ 2 ha)的高质量木鼠栖息地(即具有茂密的林下植被和硬木的年轻森林)可以为斑点猫头鹰和其他捕食者提供“钓鱼洞”,从而支持周围成熟森林中更高的木鼠密度,从而有助于实现斑点猫头鹰保护和森林恢复力的目标。更广泛地说,我们强调了多尺度研究的好处,并证明恢复景观异质性,包括创建小型早期演替森林,可能有利于物种保护,而不会影响全球森林生态系统恢复能力的努力。
{"title":"Multi-scale forest heterogeneity promotes occupancy of dusky-footed woodrats in the Sierra Nevada","authors":"Corbin C. Kuntze ,&nbsp;Jonathan N. Pauli ,&nbsp;John J. Keane ,&nbsp;Kevin N. Roberts ,&nbsp;Brian P. Dotters ,&nbsp;H. Anu Kramer ,&nbsp;M. Zachariah Peery","doi":"10.1016/j.foreco.2024.122412","DOIUrl":"10.1016/j.foreco.2024.122412","url":null,"abstract":"<div><div>Forested landscapes are naturally heterogeneous, with the distribution of resources influencing animal habitat selection at multiple spatial scales. However, anthropogenic activities and changing disturbance regimes have reorganized how forests are structured from fine- to landscape-scales, generally with unknown consequences for forest-associated wildlife. For instance, fire suppression and selective logging in the western US has led to more homogeneous forests with fewer small patches of early-successional vegetation. As forest management aims to improve forest resilience to extreme fire and drought by restoring historical disturbance regimes and modifying forest structure through fuel management, there is a need for studies that evaluate how animals respond to forest heterogeneity at multiple scales. Here, we estimated occupancy for the dusky-footed woodrat (<em>Neotoma fuscipes</em>), an important prey species for many forest predators including the California spotted owl (<em>Strix occidentalis occidentalis</em>), relative to forest structure and composition at site-, patch-, and landscape-scales within landscapes where forest heterogeneity was created by even-aged timber management. Woodrats were more likely to occupy sites with greater canopy cover, understory cover, and hardwoods – particularly tanoak (<em>Notholithocarpus densiflorus</em>) – and smaller patches of young forest. Woodrats were also more likely to occupy mature forests in close proximity to younger forests, suggesting that young forest patches with more favorable local conditions can produce populations that recruit into adjacent, lower-quality mature forests. Our results suggest that creating small (∼2 ha) patches of high-quality woodrat habitat (i.e., young forests with dense understory and hardwoods) could provide “fishing holes” for spotted owls and other predators by supporting higher woodrat densities in surrounding mature forests managed for fuels – thus helping to meet both spotted owl conservation and forest resilience objectives. More broadly, we highlight the benefits of multi-scale studies and demonstrate that restoring landscape heterogeneity, including the creation of small early-successional forests, may benefit species conservation without compromising efforts to improve resilience in forest ecosystems globally.</div></div>","PeriodicalId":12350,"journal":{"name":"Forest Ecology and Management","volume":"578 ","pages":"Article 122412"},"PeriodicalIF":3.7,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Consistent growth responses of silver fir (Abies alba Mill.) and European beech (Fagus sylvatica L.) to drought in mixed and monospecific forests: Insights from Central European forests 在混合和单种森林中,银杉(Abies alba Mill.)和欧洲山毛榉(Fagus sylvatica L.)对干旱的持续生长响应:来自中欧森林的见解
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2024-11-29 DOI: 10.1016/j.foreco.2024.122415
Piotr Gbur , Piotr Wrzesiński , Marcin Klisz , Jernej Jevšenak , Marzena Niemczyk , Stanisław Drozdowski
Ongoing climate change, characterized by an increased frequency of extreme weather events, including severe droughts, negatively impacts forest ecosystems. However, tree responses differ across tree species and stand composition (mixtures vs. pure stands), which may serve as an important management strategy for forest adaptation to climate change. To investigate the effect of stand composition on drought resilience, we conducted research on forest ecosystems in the Polish Outer Carpathians at the eastern edge of the distribution range of two important European tree species, silver fir (Abies alba) and European beech (Fagus sylvatica). The aim of our study was to identify climatic factors influencing the growth of these species and to examine their drought sensitivity and productivity. For this purpose, we sampled 100 fir and 100 beech trees from both mixed and monospecific stands. We applied a dendroclimatological approach to determine temporal stability of climate–growth relationships. Lloret’s resilience indices were used to quantify the response of tree growth to episodic drought stress, while to derive differences in productivity, we applied the generalized additive mixed models (GAMMs). Our results showed species specific climate sensitivity which remain consistent regardless of mixture only for fir. Fir responded positively to higher temperatures, especially during spring, but required more precipitation, particularly in summer. Beech exhibited lower sensitivity to climate in mixed than in monospecific stands and exhibited higher resistance than fir. Importantly, species responses to droughts were driven by the duration of specific drought event and the timing in which it occurred. Furthermore, our results revealed that mixed stands were more resistant to extreme drought events. Fir showed higher resistance to extreme drought events in mixed stands than in pure stands. Overall, silver fir exhibited higher productivity than European beech. Especially in younger cohorts, it was higher for pure stands, but fir from mixed stands exhibited increasing productivity with age and delayed culmination. Our findings indicate that both species can form resilient stands in the studied region, making them viable for forest management in the face of climate change. Mixtures of fir and beech are particularly valid option to promote forest sustainability and productivity in mountain regions. Managed mixed stands of Abies alba and Fagus sylvatica demonstrated advantages in productivity and stability under extreme drought conditions. However, varying intensities of management interventions and structural differences between stands and among studies complicate direct comparisons, highlighting the need for more standardized approaches to analyzing species responses and management strategies in the future.
以极端天气事件(包括严重干旱)频率增加为特征的持续气候变化对森林生态系统产生了负面影响。然而,不同树种和林分(混交林与纯林分)对气候变化的响应存在差异,这可能是森林适应气候变化的重要管理策略。为了研究林分组成对干旱恢复能力的影响,我们在波兰外喀尔巴阡山脉的两种重要欧洲树种银杉(Abies alba)和欧洲山毛榉(Fagus sylvatica)分布范围的东部边缘对森林生态系统进行了研究。我们研究的目的是确定影响这些物种生长的气候因素,并检查它们的干旱敏感性和生产力。为此,我们从混合和单种林分中取样了100棵冷杉和100棵山毛榉。我们应用树木气候学方法来确定气候-生长关系的时间稳定性。采用Lloret弹性指数来量化树木生长对干旱胁迫的响应,采用广义加性混合模型(GAMMs)来推导生产力差异。我们的结果表明,物种特定的气候敏感性保持一致,无论混合,只有杉木。冷杉对高温有积极的反应,特别是在春季,但需要更多的降水,特别是在夏季。山毛榉混合林分对气候的敏感性低于单一林分,对气候的抗性高于冷杉林分。重要的是,物种对干旱的反应是由特定干旱事件的持续时间和发生时间驱动的。此外,我们的研究结果表明,混交林对极端干旱事件的抵抗能力更强。杉木混交林对极端干旱事件的抗逆性高于单纯林分。总体而言,银杉的生产力高于欧洲山毛榉。特别是在年轻群体中,纯林分的产量较高,但混合林分的产量随年龄和生育期的推迟而增加。我们的研究结果表明,这两个物种都可以在研究区域形成有弹性的林分,使它们在面对气候变化时能够进行森林管理。冷杉和山毛榉的混合物是促进山区森林可持续性和生产力的特别有效的选择。在极端干旱条件下,经管理的冷杉和山毛榉混交林在生产力和稳定性方面具有优势。然而,不同的管理干预强度和林分之间和研究之间的结构差异使直接比较复杂化,突出表明未来需要更标准化的方法来分析物种反应和管理策略。
{"title":"Consistent growth responses of silver fir (Abies alba Mill.) and European beech (Fagus sylvatica L.) to drought in mixed and monospecific forests: Insights from Central European forests","authors":"Piotr Gbur ,&nbsp;Piotr Wrzesiński ,&nbsp;Marcin Klisz ,&nbsp;Jernej Jevšenak ,&nbsp;Marzena Niemczyk ,&nbsp;Stanisław Drozdowski","doi":"10.1016/j.foreco.2024.122415","DOIUrl":"10.1016/j.foreco.2024.122415","url":null,"abstract":"<div><div>Ongoing climate change, characterized by an increased frequency of extreme weather events, including severe droughts, negatively impacts forest ecosystems. However, tree responses differ across tree species and stand composition (mixtures vs. pure stands), which may serve as an important management strategy for forest adaptation to climate change. To investigate the effect of stand composition on drought resilience, we conducted research on forest ecosystems in the Polish Outer Carpathians at the eastern edge of the distribution range of two important European tree species, silver fir (<em>Abies alba</em>) and European beech (<em>Fagus sylvatica</em>). The aim of our study was to identify climatic factors influencing the growth of these species and to examine their drought sensitivity and productivity. For this purpose, we sampled 100 fir and 100 beech trees from both mixed and monospecific stands. We applied a dendroclimatological approach to determine temporal stability of climate–growth relationships. Lloret’s resilience indices were used to quantify the response of tree growth to episodic drought stress, while to derive differences in productivity, we applied the generalized additive mixed models (GAMMs). Our results showed species specific climate sensitivity which remain consistent regardless of mixture only for fir. Fir responded positively to higher temperatures, especially during spring, but required more precipitation, particularly in summer. Beech exhibited lower sensitivity to climate in mixed than in monospecific stands and exhibited higher resistance than fir. Importantly, species responses to droughts were driven by the duration of specific drought event and the timing in which it occurred. Furthermore, our results revealed that mixed stands were more resistant to extreme drought events. Fir showed higher resistance to extreme drought events in mixed stands than in pure stands. Overall, silver fir exhibited higher productivity than European beech. Especially in younger cohorts, it was higher for pure stands, but fir from mixed stands exhibited increasing productivity with age and delayed culmination. Our findings indicate that both species can form resilient stands in the studied region, making them viable for forest management in the face of climate change. Mixtures of fir and beech are particularly valid option to promote forest sustainability and productivity in mountain regions. Managed mixed stands of <em>Abies alba</em> and <em>Fagus sylvatica</em> demonstrated advantages in productivity and stability under extreme drought conditions. However, varying intensities of management interventions and structural differences between stands and among studies complicate direct comparisons, highlighting the need for more standardized approaches to analyzing species responses and management strategies in the future.</div></div>","PeriodicalId":12350,"journal":{"name":"Forest Ecology and Management","volume":"577 ","pages":"Article 122415"},"PeriodicalIF":3.7,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Root rot increases the vulnerability of Norway spruce trees to Ips typographus infestation 根腐病使挪威云杉更容易受到 Ips typographus 的侵袭
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2024-11-27 DOI: 10.1016/j.foreco.2024.122409
W. Wahlman , R. Kasanen , L. Lappalainen , J. Honkaniemi
Norway spruce (Picea abies) is one of the most economically important tree species in Northern and Central Europe. Root rot caused by Heterobasidion annosum s.l. and the European spruce bark beetle (Ips typographus) are major disturbance agents of Norway spruce and are expected to increasingly affect spruce-dominated forests as the climate warms. This study investigated the direct interaction between root rot and I. typographus, with the aim of examining whether root rot and the stress it causes to a tree increases the risk of subsequent bark beetle attack.
In total, 442 Norway spruce trees from nine different mature, even-aged forest stands were studied. First, symptoms caused by I. typographus were evaluated before final felling from each tree based on visual assessments of crown and stem conditions. After the felling, the sample plots were relocated from the clearcut areas, and the stumps of sampled trees were reassessed for root rot. Exploratory analysis and binomial Generalized Linear Mixed Model (GLMM) were used to analyze relationships between explanatory variables and their effect to I. typographus infestation.
The best predictors for I. typographus infestation at individual tree level were presence of root rot and to a lesser extent, tree diameter at breast height. Seventy-five percent of root rot-infected trees were also infested with I. typographus, and most of those trees were either dead or severely infested. Results suggest that root rot weakens trees, making them more vulnerable to subsequent I. typographus infestation, especially early in outbreaks when bark beetle population densities are low.
挪威云杉(Picea abies)是北欧和中欧最重要的经济树种之一。由Heterobasidion annosum s.l.和欧洲云杉树皮甲虫(Ips typographus)引起的根腐病是对挪威云杉的主要干扰因素,随着气候变暖,预计对云杉为主的森林的影响将越来越大。本研究调查了根腐病和欧洲云杉树皮甲虫之间的直接相互作用,目的是研究根腐病及其对树木造成的压力是否会增加随后树皮甲虫侵袭的风险。首先,在最终砍伐每棵树之前,根据对树冠和树干状况的目测评估,对I.typographus造成的症状进行评估。砍伐后,将样本地块从砍伐区域移出,并对样本树桩的根腐病进行重新评估。探索性分析和二项式广义线性混合模型(GLMM)被用来分析解释变量之间的关系及其对I. typographus侵扰的影响。75%受根腐病侵染的树木也受到了典型斑潜蝇的侵染,其中大部分树木已经死亡或受到严重侵染。研究结果表明,根腐病会削弱树木的生命力,使其更容易受到I. typographus的侵扰,尤其是在树皮甲虫种群密度较低的爆发初期。
{"title":"Root rot increases the vulnerability of Norway spruce trees to Ips typographus infestation","authors":"W. Wahlman ,&nbsp;R. Kasanen ,&nbsp;L. Lappalainen ,&nbsp;J. Honkaniemi","doi":"10.1016/j.foreco.2024.122409","DOIUrl":"10.1016/j.foreco.2024.122409","url":null,"abstract":"<div><div>Norway spruce (<em>Picea abies</em>) is one of the most economically important tree species in Northern and Central Europe. Root rot caused by <em>Heterobasidion annosum</em> s.l. and the European spruce bark beetle (<em>Ips typographus</em>) are major disturbance agents of Norway spruce and are expected to increasingly affect spruce-dominated forests as the climate warms. This study investigated the direct interaction between root rot and <em>I. typographus</em>, with the aim of examining whether root rot and the stress it causes to a tree increases the risk of subsequent bark beetle attack.</div><div>In total, 442 Norway spruce trees from nine different mature, even-aged forest stands were studied. First, symptoms caused by <em>I. typographus</em> were evaluated before final felling from each tree based on visual assessments of crown and stem conditions. After the felling, the sample plots were relocated from the clearcut areas, and the stumps of sampled trees were reassessed for root rot. Exploratory analysis and binomial Generalized Linear Mixed Model (GLMM) were used to analyze relationships between explanatory variables and their effect to <em>I. typographus</em> infestation.</div><div>The best predictors for <em>I. typographus</em> infestation at individual tree level were presence of root rot and to a lesser extent, tree diameter at breast height. Seventy-five percent of root rot-infected trees were also infested with <em>I. typographus</em>, and most of those trees were either dead or severely infested. Results suggest that root rot weakens trees, making them more vulnerable to subsequent <em>I. typographus</em> infestation, especially early in outbreaks when bark beetle population densities are low.</div></div>","PeriodicalId":12350,"journal":{"name":"Forest Ecology and Management","volume":"577 ","pages":"Article 122409"},"PeriodicalIF":3.7,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tree size and site environment affects sessile oak growth and intrinsic water-use efficiency response to wet-dry years 树木大小和地点环境影响无梗栎树的生长和对干湿年的内在用水效率反应
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2024-11-26 DOI: 10.1016/j.foreco.2024.122413
Kathiravan Meeran , Michael Grabner , Katharina Schott , Elisabeth Wächter , Marcela van Loo , Andrea Watzinger
Drought is a significant global environmental stressor that impacts tree growth and survival, often causing substantial die-offs in temperate forests. Hence, contemporary forest management strategies increasingly aim to transition from spruce-dominated to mixed forest with more climate-resilient species such as oaks. Sessile oak (Quercus petraea (Matt.) Liebl.), a key forest tree species, is widespread across central Europe, but its response to climate extremes, especially individual intraspecific variability, remains poorly understood. In this study, we analysed tree-ring cores from 404 sessile oak trees in Thayatal National park, Austria. We assessed radial growth through tree-ring width and evaluated intrinsic water-use efficiency (iWUE) by analyzing δ13C in latewood from wet (1987) and dry (1994) years. Further, we investigated the effects of site conditions, specifically light and water status inferred from potential daylight duration and the topographic wetness index (TWI), on key tree characteristics such as diameter at breast height (DBH), height, and the height-to-diameter ratio (HDR). We then examined how these factors affected iWUE and radial growth under wet and dry years, assessing radial growth's resistance, resilience, and recovery. As expected, iWUE was increased and radial growth was decreased during the dry year compared to the wet year, but there was high intraspecific variability. Tree age and size influenced these responses; age positively affected growth during the dry year, followed by decreased drought recovery. Increased daylight duration improved iWUE and reduced growth during the dry year but supported drought recovery. During the dry year, iWUE positively affected growth and resistance to drought. The TWI correlated with increased tree height and DBH but did not affect iWUE and growth responses under extreme years. Our findings suggest promoting mixed-age stands could enhance forest resilience against drought. Moreover, forest management strategies should integrate specific environmental conditions, including light availability and water status, to effectively mitigate impact of climate extremes.
干旱是影响树木生长和存活的一个重要的全球环境压力因素,经常导致温带森林大量死亡。因此,当代森林管理战略的目标越来越多地从云杉为主过渡到种植橡树等气候适应性更强的树种的混交林。无梗橡树(Quercus petraea (Matt.) Liebl.)是一种重要的森林树种,广泛分布于中欧地区,但人们对其对极端气候的反应,尤其是种内个体差异,仍然知之甚少。在这项研究中,我们分析了奥地利塔亚塔尔国家公园中 404 棵无柄橡树的树环芯。我们通过树环宽度评估了径向生长,并通过分析潮湿年份(1987 年)和干燥年份(1994 年)晚材中的 δ13C 评估了内在水分利用效率(iWUE)。此外,我们还研究了场地条件(特别是从潜在日照时间和地形湿润指数(TWI)推断出的光照和水分状况)对胸径(DBH)、高度和高径比(HDR)等关键树木特征的影响。然后,我们研究了这些因素在潮湿和干旱年份对 iWUE 和径向生长的影响,评估了径向生长的抵抗力、恢复力和复原力。不出所料,与潮湿年份相比,干旱年份的iWUE增加,径向生长减少,但种内差异很大。树龄和大小对这些反应有影响;树龄对干旱年份的生长有积极影响,随后干旱恢复能力下降。日照时间的延长改善了iWUE,降低了干旱年份的生长,但有利于干旱恢复。在干旱年份,iWUE 对生长和抗旱能力有积极影响。TWI与树高和DBH的增加相关,但不影响iWUE和极端年份下的生长反应。我们的研究结果表明,推广混龄林可以提高森林的抗旱能力。此外,森林管理策略应结合特定的环境条件,包括光照和水分状况,以有效减轻极端气候的影响。
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引用次数: 0
The influence of fire and termites on tree hollow development in an Australian tropical savanna 火灾和白蚁对澳大利亚热带稀树草原树洞发育的影响
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2024-11-26 DOI: 10.1016/j.foreco.2024.122403
Ellen Rochelmeyer , Brett P. Murphy , Shaun R. Levick , Alyson M. Stobo-Wilson , Anna E. Richards
Tree hollows are important habitat resources for wildlife globally. In the tropical savannas of northern Australia, the abundance of tree hollows is influenced by both fire and termites. With the regular application of prescribed fire in these ecosystems, it is important to understand the implications of fire management on important habitat resources – especially when applied over the long-term. This study uses a long-term fire experiment (18 years of applied fire treatments) with targeted termite and tree hollow surveys to investigate how the proportion of stem hollowing and abundance of hollow entrances are affected by termites and different long-term fire regimes. We used sonic tomography in a novel application to non-destructively estimate tree stem hollowing. Trunk diameter was identified as the strongest predictor of both stem hollowing and hollow entrance abundance, with larger trees having a greater proportion of the stem hollowing and greater number of hollow entrances. The proportion of stem hollowing tended to be greater closer to the base of the tree, and the number of hollow entrances was greater in Eucalyptus miniata than E. tetrodonta. While the proportion of stem that was hollowed did not influence the number of hollow entrances, the presence of any hollowing at 1.3 m was associated with more hollow entrances. We did not detect an effect of fire activity on stem hollowing or the abundance of hollow entrances at the individual tree level, and it may be that these effects are only detectable at the stand level due to changes in tree demographics with varying fire regimes. As large trees tend to have more hollow entrances, management to promote habitat for wildlife should focus on fire regimes that avoid the loss of large trees in the landscape.
树洞是全球野生动物的重要栖息地资源。在澳大利亚北部的热带稀树草原,树洞的丰富程度受到火灾和白蚁的影响。由于在这些生态系统中定期使用规定火种,因此了解火种管理对重要栖息地资源的影响非常重要,尤其是在长期使用火种的情况下。本研究利用长期用火试验(18 年的用火处理)和有针对性的白蚁与树洞调查,研究白蚁和不同的长期用火制度如何影响茎干掏空的比例和树洞入口的丰度。我们采用声波断层扫描技术,以非破坏性方式估算树干中空程度。树干直径被认为是预测树干空洞和空洞入口数量的最有力指标,大树的树干空洞比例更高,空洞入口数量也更多。靠近树基的茎干中空比例往往更大,迷你桉树的中空入口数量也比四叶桉树多。虽然茎干中空的比例并不影响中空入口的数量,但在1.3米处出现任何中空都与中空入口的数量有关。我们没有在单棵树的水平上检测到火灾活动对茎干掏空或空洞入口数量的影响,可能只有在林分水平上才能检测到这些影响,这是因为不同的火灾制度会改变树木的结构。由于大树往往有更多的空洞入口,因此促进野生动物栖息地的管理应侧重于避免景观中大树损失的火灾机制。
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引用次数: 0
Determining the effects of reduced water availability on seed germination of five bottomland hardwood tree species 确定水分供应减少对五种底层硬木树种种子萌发的影响
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2024-11-26 DOI: 10.1016/j.foreco.2024.122410
Charles J. Pell , Sammy L. King , Tracy Hawkins , Matt Symmank
Globally, floodplain forests are experiencing shifts in species composition associated with drier conditions and disruptions of flood pulse hydrology. The specific processes behind these shifts in composition are not fully understood, but differential effects of drought on regeneration processes such as seed germination may be partially responsible. To determine how reduced water availability impacts seed germination of different floodplain tree species, a lab-controlled germination experiment was conducted. Seeds from tree species common to floodplain forests of the southeastern and southcentral United States whose abundance have been altered by drier hydrogeomorphic conditions were examined. These seeds included desiccation resistant, or orthodox, seeds of sugarberry (Celtis laevigata) and green ash (Fraxinus pennsylvanica), and desiccation sensitive, or recalcitrant, acorns of overcup oak (Quercus lyrata), water oak (Quercus nigra), and willow oak (Quercus phellos). Seeds of each species were incubated with one of eight osmotically adjusted water solutions ranging in water potential from 0.0 MPa to −1.4 MPa. This reduction in water potential decreases the water available to the seeds for germination. After four weeks, seed germination of all species decreased with reduced water potential; however, desiccation tolerance did not correspond with the ability to germinate under lower water potential. Orthodox seeds only germinated in higher water potential treatments. Sugarberry reached 30 % germination in only the control 0.0 MPa treatment while green ash reached 30 % germination in treatments as low as −0.4 MPa. In contrast, recalcitrant acorns continued to germinate under lower water potentials. Water oak maintained 30 % or greater germination under all treatments and willow oak reached 30 % down to −0.8 MPa. Overcup oak was the only species to not respond to water potential treatment. With respect to maximum germination, sugarberry and green ash reached maximum germination an average of 9 days sooner than the oak species. The results of this study agree with others that demonstrate that seed germination success is sensitive to environmental water conditions and that species specific differences in germination traits are linked to broader life history strategies that are adaptive to common environmental conditions in their range.
在全球范围内,洪泛平原森林正经历着与更干旱条件和洪水脉冲水文中断相关的物种组成变化。这些物种组成变化背后的具体过程尚不完全清楚,但干旱对种子萌发等再生过程的不同影响可能是部分原因。为了确定水分供应的减少如何影响不同洪泛平原树种的种子萌发,我们进行了一项实验室控制的萌发实验。实验研究了美国东南部和中南部洪泛平原森林中常见的树种的种子,这些树种的丰度因较干旱的水文地质条件而有所改变。这些种子包括糖莓(Celtis laevigata)和绿梣(Fraxinus pennsylvanica)的抗干燥种子或正统种子,以及过杯栎(Quercus lyrata)、水栎(Quercus nigra)和柳栎(Quercus phellos)的干燥敏感种子或顽固种子。每个物种的种子都用水势从 0.0 兆帕到-1.4 兆帕的八种渗透调节水溶液之一进行培养。水势的降低会减少种子萌发所需的水分。四周后,所有物种的种子萌发率都随着水势的降低而降低;然而,干燥耐受性与在较低水势下的萌发能力并不一致。东正教种子只在水势较高的处理中发芽。糖果树仅在 0.0 兆帕的对照处理中达到 30% 的发芽率,而白蜡树在低至 -0.4 兆帕的处理中也能达到 30% 的发芽率。相比之下,顽固的橡子在较低的水势下仍能继续发芽。水栎在所有处理下都能保持 30% 或更高的发芽率,柳栎在-0.8 兆帕时也能达到 30%。过杯栎是唯一对水势处理无反应的物种。在最大发芽率方面,糖莓和青灰比栎树平均早 9 天达到最大发芽率。这项研究结果与其他研究结果一致,都表明种子萌发成功与否对环境水势条件很敏感,而且物种在萌发特性上的具体差异与适应其分布区常见环境条件的更广泛的生活史策略有关。
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引用次数: 0
Towards the construction of a seed traits database for restoration of subtropical seasonally dry ecosystems: Effects of light, temperature and seed storage on germination 为恢复亚热带季节性干旱生态系统建立种子性状数据库:光照、温度和种子储藏对萌发的影响
IF 3.7 2区 农林科学 Q1 FORESTRY Pub Date : 2024-11-26 DOI: 10.1016/j.foreco.2024.122390
Ana E. Ferreras , Paula Venier , Paula I. Marcora , Paula A. Tecco , Guillermo Funes , Melisa A. Giorgis , Fernando A. Gallará , Sebastián R. Zeballos
There is an increasing need to restore areas with native species, but there is scarce knowledge about their germination requirements. Understanding the conditions for producing a high number of germinated seeds and how long seeds can be stored while maintaining their viability, may determine the success of a restoration project. Here, we present a group of species from subtropical seasonally dry forests of Córdoba, and the main modulators of their germination, in order to improve restoration practices. In recently collected seeds of 36 species, we evaluated germination at four alternating temperatures (15/5, 20/10, 25/15 and 35/20 ºC) in light and darkness, to define the optimal germination conditions. Additionally, we determined the effect of different times of seed storage on germination. Twenty three species showed germination percentages higher than 60 % at least at one temperature. Temperature and light had an effect on germination of most species. Many species had optimal germination at 25/15 ºC (50 %), most were indifferent to light (84.6 %), germinated in an average of ten days (73.5 %), and maintained their germination capacity for at least a year after being stored (65 %). This work marks the beginning of the development of a database of seed traits for subtropical native species of various life forms, distinguished by being produced from experimental trials conducted for this purpose.
人们越来越需要用本地物种来恢复这些地区,但对它们的发芽要求却知之甚少。了解产生大量发芽种子的条件以及种子在保持活力的情况下可储存多长时间,可能会决定恢复项目的成败。在此,我们介绍了科尔多瓦亚热带季节性干旱森林中的一组物种及其萌发的主要调节因素,以改进恢复实践。在最近收集的 36 个物种的种子中,我们评估了在四种交替温度(15/5、20/10、25/15 和 35/20 ºC)下的光照和黑暗条件下的萌发情况,以确定最佳萌发条件。此外,我们还测定了不同的种子储藏时间对萌发的影响。23 种植物至少在一种温度下的发芽率高于 60%。温度和光照对大多数物种的发芽都有影响。许多物种在 25/15 ºC 的温度下发芽率最高(50%),大多数物种对光照无影响(84.6%),平均十天发芽一次(73.5%),贮藏后至少一年仍能保持发芽能力(65%)。这项工作标志着亚热带各种生命形式的本地物种种子性状数据库的开发工作已经开始。
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引用次数: 0
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Forest Ecology and Management
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