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“Profitability is sustainability:” framing of forest management practices by the Swedish forest industry “盈利就是可持续性”:瑞典森林工业的森林管理实践框架
IF 1.8 3区 农林科学 Q2 FORESTRY Pub Date : 2023-09-02 DOI: 10.1080/02827581.2023.2252740
Petter Heder Brandt, Anders Olsson, Karl Dahlquist, Tuba Inal
ABSTRACT This article investigates how the Swedish forest industry, as represented by the three largest Swedish private forest companies (Svenska Cellulosa AB, Stora Enso, and Holmen), through their main public relations (PR) channels frame the current dominant Swedish forestry model and alternative models that are promoted by the European Union (EU). The content analysis of the three companies’ trade magazines published between 2019 and 2022 explores the patterns in the PR framing of the forest management models with respect to economic, environmental, and social aspects. The time interval is centered by the July 2021 announcement of the EU's new Forest Strategy for 2030. The magazines’ target audience is private forest owners, from whom Svenska Cellulosa AB, Stora Enso, and Holmen buy 40–50% of the timber used in production. The main finding of the study is that these corporations did not present alternative methods as viable options to replace the Swedish forestry model. The magazines, with some individual variations, respond to the alternative methods promoted by the EU and environmental associations by an increased emphasis on the benefits, mainly environmental, of the Swedish forestry model – framing the model as not only the most profitable but also the most ecologically sustainable.
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引用次数: 0
How Białowieża Forest preserved its primevalness? The development of management and protection in the fourteenth−eighteenth centuries Białowieża森林是如何保存其原始状态的?14 - 18世纪管理和保护的发展
IF 1.8 3区 农林科学 Q2 FORESTRY Pub Date : 2023-08-18 DOI: 10.1080/02827581.2023.2239161
Stanisław Zawadzki, B. Jędrzejewska
ABSTRACT The former royal forests of the Grand Duchy of Lithuania present a unique example of centuries-old protection. Based on archival documents and published literature, we analyzed the evolution of the management and protection system of Białowieża Forest in the fourteenth-eighteenth century. The timeframe of our analysis (1386-1795) covers the period of the union of the Kingdom of Poland and the Grand Duchy of Lithuania. The Białowieża Forest (BF, now on the borderland of Poland and Belarus) has been the most prominent example of successful long-term protection efforts. The results present: (1) the evolution of the legal status of BF in 1386-1795, (2) the role this woodland played for the monarchs, (3) the goals of protecting BF's resources, (4) types of threats to the forest environment and methods of counteracting risks and enforcing protection, and (5) the development of the hunting and forest personnel of BF and their duties. The egalitarian character and horizontal structure of that personnel, which existed since the fourteenth century (beaters), by the years 1765-1795 developed into a five-level, hierarchical structure (beaters, rangers, guards, subordinate foresters, and a forester), with differentiated tasks and a high complexity of responsibilities and duties.
摘要立陶宛大公国的前皇家森林是数百年来保护的独特范例。根据档案文献和已发表的文献,我们分析了14至18世纪比亚沃维耶森林管理和保护系统的演变。我们分析的时间框架(1386-1795)涵盖了波兰王国和立陶宛大公国联合的时期。Białowieża森林(BF,现位于波兰和白俄罗斯边境)是长期保护工作取得成功的最突出例子。结果表明:(1)1386-1795年BF法律地位的演变,(2)这片林地对君主的作用,(3)保护BF资源的目标,(4)对森林环境的威胁类型和应对风险和加强保护的方法,以及(5)BF狩猎和林业人员的发展及其职责。自十四世纪(打人者)以来,该人员的平等主义特征和横向结构一直存在,到1765-1795年,发展成为五级层次结构(打人人者、护林员、警卫、下属护林员和护林员),任务不同,责任和职责高度复杂。
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引用次数: 0
Taper, volume, and bark thickness models for spruce, pine, and birch in Norway 挪威云杉、松树和桦树的锥度、体积和树皮厚度模型
IF 1.8 3区 农林科学 Q2 FORESTRY Pub Date : 2023-08-08 DOI: 10.1080/02827581.2023.2243821
E. Hansen, Johannes Rahlf, R. Astrup, T. Gobakken
ABSTRACT Taper models, which describe the shape of tree stems, are central to estimating stem volume. Literature provides both taper- and volume models for the three main species in Norway, Norway spruce, Scots pine, and birch. These models, however, were mainly developed using approaches established over 50 years ago, and without consistency between taper and volume. We tested eleven equations for taper and six equations for bark thickness. The models were fitted and evaluated using a large dataset covering all forested regions in Norway. The selected models were converted into volume functions using numerical integration, providing both with- and without-bark volumes and compared to the volume functions in operational use. Taper models resulted in root mean squared error (RMSE) of 7.2, 7.9, and 9.0 mm for spruce, pine, and birch respectively. Bark thickness models resulted in RMSE of 2.5, 6.1, and 4.1 mm, for spruce, pine, and birch respectively. Validation of volume models with bark resulted in RMSE of 12.7%, 13.0%, and 19.7% for spruce, pine, and birch respectively. Additional variables, tree age, site index, elevation, and live crown proportion, were tested without resulting in any strong increase in predictive power.
描述树干形状的锥形模型是估计树干体积的核心。文献提供了挪威云杉、苏格兰松和桦树这三个主要物种的锥度和体积模型。然而,这些模型主要是使用50多年前建立的方法开发的,并且在锥度和体积之间没有一致性。我们测试了11个锥度方程和6个树皮厚度方程。使用覆盖挪威所有森林地区的大型数据集对模型进行了拟合和评估。使用数值积分将选定的模型转换为体积函数,提供有树皮和无树皮的体积,并与操作使用中的体积函数进行比较。锥度模型导致均方根误差(RMSE)分别为7.2、7.9和9.0 云杉、松树和桦树分别为mm。树皮厚度模型的RMSE分别为2.5、6.1和4.1 mm,分别用于云杉、松树和桦树。用树皮验证体积模型,结果云杉、松树和桦树的RMSE分别为12.7%、13.0%和19.7%。对其他变量,树龄、场地指数、海拔和活冠比例进行了测试,但预测能力没有显著提高。
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引用次数: 1
Change in Carpinus betulus flowering in the Czech Republic 捷克共和国桦树开花的变化
IF 1.8 3区 农林科学 Q2 FORESTRY Pub Date : 2023-08-08 DOI: 10.1080/02827581.2023.2245334
L. Hájková, M. Mozny, Veronika Oušková, Z. Žalud
ABSTRACT Common hornbeam (Carpinus betulus) is one of the most important spring pollen allergens widespread in the Czech Republic. This study evaluates the changes in Carpinus betulus flowering and the length of the blooming period in the Czech Republic during 1991–2020. Temporal and spatial evaluations in the timing of the flowering and the length of the blooming period were investigated at different altitudinal levels. Moreover, the changes in mean air temperature and precipitation total in spring months (March–April–May) were assessed, including the correlation with phenological data. Geographic Information System methods, the Mann–Kendall test and Pearson’s correlation coefficient were used for processing. The flowering of Carpinus betulus changed significantly over time during the 1991–2020 period. The linear models predicted early flowering in Carpinus betulus at different altitudes (27 days at > 701 m; 18 days at 501–700 m; and 13 days at 301–500 m) significantly (p<0.001) over the last three decades. Furthermore, the length of the blooming period of Carpinus betulus has been shortened (4 days) at the 301–500 m a.s.l. altitudinal level significantly (p<0.05). The strongest correlation was predominantly observed between flowering and the mean air temperature (March–April–May).
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引用次数: 0
Forest ownership objectives and their connection with forestry activities: a confirmatory approach to studying gender differences 森林所有权目标及其与林业活动的联系:研究性别差异的确证性方法
IF 1.8 3区 农林科学 Q2 FORESTRY Pub Date : 2023-07-18 DOI: 10.1080/02827581.2023.2235276
Juulia Kuhlman, S. Berghäll, Annukka Vainio
ABSTRACT Research suggests that gender is an important factor explaining the differences of forest owners. Nonetheless, little research has focused on gender. Results from a questionnaire (n = 6558) conducted in Finland are utilised to study the gender, forest owner objectives and their connection with forest owner activity. This paper aims to validate a five-dimensional forest ownership objective structure utilising confirmatory factor analysis. Furthermore, gender differences between objectives and forest owner activity are studied. Based on the confirmatory analysis, results support the five-dimensional objective structure with women and men forest owners. Further analysis indicates that income is the only objective connected with activity and the relationships between the objectives and activity differ between genders. This model is the first to connect forest ownership dimensions with activities related to forest ownership in a confirmatory factor analysis. Understanding that only income-related objectives correlate with activity may help in understanding forest owners with diversifying objectives.
摘要研究表明,性别是解释森林所有者差异的重要因素。尽管如此,很少有研究关注性别问题。问卷调查结果(n = 6558)用于研究性别、森林所有者目标及其与森林所有者活动的关系。本文旨在利用验证性因素分析来验证五维森林所有权目标结构。此外,还研究了目标和森林所有者活动之间的性别差异。基于验证性分析,结果支持男女森林所有者的五维目标结构。进一步的分析表明,收入是与活动相关的唯一目标,这些目标与活动之间的关系因性别而异。该模型是第一个在验证性因素分析中将森林所有权维度与森林所有权相关活动联系起来的模型。了解只有与收入有关的目标与活动相关,可能有助于了解目标多样化的森林所有者。
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引用次数: 0
Occupancy rates of excavated cavities and nest boxes in managed boreal forest in relation to forest structure 经管理的北方针叶林挖洞和巢箱占用率与森林结构的关系
IF 1.8 3区 农林科学 Q2 FORESTRY Pub Date : 2023-07-13 DOI: 10.1080/02827581.2023.2235272
Jan Hanzelka, Daniele Baroni, T. Laaksonen
ABSTRACT Cavity nesting birds depend on the availability of tree cavities for breeding, but the structure of the surrounding environment may also impact cavity occupancy. Here we investigated the effects of forest structure on occupancy rates of excavated cavities and similar-size nest boxes by cavity nesters in managed southern boreal forests in Finland. We recorded the occupancy over five breeding seasons (2017–2021) and derived forest structure parameters from high-resolution thematic raster maps. We found a high occupancy rate in nest boxes (81%), but lower rates in natural cavities excavated in forest interior, forest edges and retention trees (42-46%). The analyzes focusing on Paridae only revealed that the occupancy rates in nest boxes were decreasing with increasing amounts of Norway spruce and deciduous tree foliage biomass, and tree height, but increasing with the proportion of Scots pine. In forest interior cavities, we found a negative effect of stand age but a positive effect of the proportion of spruce. We conclude that the benefits of nest boxes can be maximized by considering specific forest parameters when deploying them. In excavated cavities the occupancy rates are likely more dependent on the varying internal quality than on the forest structure.
洞巢鸟的繁殖依赖于树洞的可用性,但周围环境的结构也可能影响洞的占用。本文研究了森林结构对芬兰南方北方针叶林中洞巢和类似大小的巢箱占用率的影响。我们记录了五个繁殖季节(2017-2021)的占用情况,并从高分辨率主题栅格图中获得森林结构参数。巢箱的入住率较高(81%),而森林内部、森林边缘和滞留树的自然洞的入住率较低(42-46%)。巢箱的占用率随挪威云杉和落叶树叶片生物量的增加和树高的增加而降低,随苏格兰松比例的增加而增加。林分林龄对林分结构的影响为负,而云杉比例对林分结构的影响为正。我们得出结论,巢箱的效益可以通过在部署时考虑特定的森林参数来最大化。在挖掘的洞穴中,占用率可能更多地取决于不同的内部质量,而不是森林结构。
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引用次数: 0
Analysis of forest tree dieback using UltraCam and UAV imagery 基于UltraCam和无人机影像的林木枯死分析
IF 1.8 3区 农林科学 Q2 FORESTRY Pub Date : 2023-07-07 DOI: 10.1080/02827581.2023.2231349
M. Naseri, Shaban Shataee Jouibary, H. Habashi
ABSTRACT In recent years, increasing tree diebacks and mortality in some forests, particularly in forest parks, created a need amongst forest managers to find effective methods to gather information about the rate of dieback and mortality and their reasons. High-quality air and space-born remote sensing data has established as an alternative to field surveys for certain inventory tasks. This study used high-quality UltraCam-Xp and UAV drone images from 2016 and 2021 to map tree dieback and mortality in Daland Forest Park, Golestan Province, Iran. High-quality ortho mosaics and Digital Surface Models (DSMs) were generated from UltraCam (2016) and UAV (2021) images. The images were then classified through object-based classification by Nearest Neighbor (NN), Support Vector Machine (SVM), and Bayes algorithms using various input data sets including spectral bands, Canopy Height Model (CHM), vegetation indices, and texture analysis features. Our results indicate that the Bayes algorithm is more precise in mapping tree dieback for the two time steps compared to other algorithms. The best tree dieback map on UltraCam images was obtained using the spectral bands with CHM, texture analysis features, and vegetation indices. This combination resulted in an overall accuracy of 91.20% and a Kappa coefficient of 0.88. It was also found that combining the UAV main bands with CHM and texture features did produce a high-accuracy map with an overall accuracy of 88.46% and a Kappa coefficient of 0.84. Change detection analysis of tree dieback showed that between 2016 and 2021, the number of healthy trees decreased, and the number of gaps and open areas increased in the study area. We conclude that UltraCam and UAV photographs can serve to identify and map tree dieback and dead trees with good accuracies and can hence support forest health monitoring.
摘要近年来,一些森林,特别是森林公园的树木枯死和死亡率不断增加,森林管理者需要找到有效的方法来收集有关枯死率和死亡率及其原因的信息。高质量的空气和太空遥感数据已成为某些库存任务的实地调查的替代方案。这项研究使用了2016年和2021年的高质量UltraCam Xp和无人机无人机图像,绘制了伊朗戈勒斯坦省达兰森林公园的树木枯死和死亡率图。根据UltraCam(2016)和UAV(2021)图像生成了高质量的正射马赛克和数字表面模型。然后,使用各种输入数据集(包括谱带、冠层高度模型、植被指数和纹理分析特征),通过最近邻(NN)、支持向量机(SVM)和贝叶斯算法对图像进行基于对象的分类。我们的结果表明,与其他算法相比,贝叶斯算法在映射两个时间步长的树枯死方面更精确。利用具有CHM的光谱带、纹理分析特征和植被指数,获得了UltraCam图像上的最佳树木枯死图。这种组合的总体准确率为91.20%,Kappa系数为0.88。研究还发现,将无人机主波段与CHM和纹理特征相结合,确实产生了高精度地图,总体精度为88.46%,Kappa系数为0.84。树木枯死的变化检测分析显示,在2016年至2021年间,研究区域内健康树木的数量减少,缺口和开放区域的数量增加。我们得出的结论是,UltraCam和无人机照片可以很准确地识别和绘制树木枯死和枯树图,从而支持森林健康监测。
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引用次数: 1
Comparing stand growth models in optimizing mixed-species forest management 林分生长模式在混交林经营优化中的比较
IF 1.8 3区 农林科学 Q2 FORESTRY Pub Date : 2023-07-04 DOI: 10.1080/02827581.2023.2227095
Nico Österberg, Vesa-Pekka Parkatti, O. Tahvonen
ABSTRACT We study the effect of forest stand growth models on the economically optimal management of boreal mixed-species forests. Our size-structured economic–ecological model includes the optimization of harvest timing, harvesting intensities, rotation periods, and the choice between rotation forestry and continuous cover forestry. We carry out a systemic comparison of economically optimal solutions obtained with three statistical–empirical stand growth models for both single- and mixed-species stands with up to four tree species. Given a 1% interest rate, the optimal choice between continuous cover and rotation forestry depends on the applied growth model. However, under a 3% interest rate, the optimal management regime is always continuous cover forestry. The optimal solution details are highly dependent on the growth models. With a 1% interest rate, it may become optimal to apply intensive close-to-clearcut harvesting that results in a dominant species change via natural regeneration. However, the level of natural regeneration varies strongly between the growth models. The economic superiority of a species mixture cannot be determined from overyielding differences. Mixed-species stands have higher maximum sustainable yields, bare land values, and average net revenues compared with monocultures.
摘要研究不同林分生长模式对北方混交林经济最优经营的影响。我们的规模结构经济生态模型包括采伐时间、采伐强度、轮作周期的优化,以及轮作林与连续覆盖林的选择。本文系统比较了单树种和混合树种林分的三种统计-经验林分生长模型的经济最优解。在1%的利率条件下,连续覆盖和轮作林业的最优选择取决于应用的生长模式。然而,在3%的利率下,最优的经营制度始终是连续覆盖森林。最优解决方案的细节高度依赖于增长模型。在利率为1%的情况下,进行密集的近距离采伐可能是最佳选择,从而通过自然再生导致优势物种的变化。然而,自然再生水平在不同的生长模式之间差异很大。一个物种混合物的经济优势不能由过度屈服的差异来决定。与单一栽培相比,混合树种林具有更高的最大可持续产量、裸地价值和平均净收入。
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引用次数: 0
EU wood production vs. biodiversity goals – possible reconciliation in Finland? 欧盟木材生产与生物多样性目标——芬兰可能和解?
IF 1.8 3区 农林科学 Q2 FORESTRY Pub Date : 2023-07-03 DOI: 10.1080/02827581.2023.2229732
M. Räty, A. Juutinen, K. Korhonen, K. Syrjänen, L. Kärkkäinen
ABSTRACT According to protection targets of EU Biodiversity Strategy 2030, 30% of EU’s land and sea area should be legally protected by 2030. While the actual targets and even terms are still to be defined, the strategy’s possible impacts can be simulated for policy support purposes. The strategy aims to increase protection by setting aside forests and extending closer-to-nature forest management practices. We simulated Finland’s forest resources with the European Forestry Dynamics Model (EFDM) considering the protection targets. According to our simulations, the total growing stock and net present value will be lower with the additional protection than by carrying on the business-as-usual management. The additional protection resulted in intensified harvesting in the remaining forest area available for wood supply with the current harvest level. This may weaken the positive ecological impacts of protection. Reducing the harvest level from the current level is not a likely alternative either, because the demand for biomass is predicted to increase in the future, while the supply is insufficient, and EU policies aim to avoid shifting the negative impacts of resource extraction outside the EU. The feasibility of the additional protection depends on the actual implementation and definitions.
根据《欧盟生物多样性战略2030》的保护目标,到2030年,欧盟30%的陆地和海洋面积应得到法律保护。虽然实际目标和术语仍有待确定,但可以模拟该战略的可能影响,以供政策支持之用。该战略旨在通过留出森林和推广更接近自然的森林管理做法来加强保护。考虑芬兰的森林保护目标,采用欧洲林业动态模型(EFDM)对芬兰的森林资源进行了模拟。根据我们的模拟,在额外的保护下,总增长库存和净现值将低于照常经营。额外的保护导致在现有采伐水平下可用于木材供应的剩余森林地区加强采伐。这可能会削弱保护的积极生态影响。从目前的水平降低收获水平也不是一个可能的选择,因为预计未来对生物质的需求会增加,而供应不足,欧盟的政策旨在避免将资源开采的负面影响转移到欧盟以外。附加保护的可行性取决于实际实施和定义。
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引用次数: 0
Walnut in Sweden: effects of nurse trees, weed control and fertilization on five-year survival and growth of planted Juglans × intermedia NG23 and NG38 瑞典核桃:护树、除草和施肥对种植核桃五年生存和生长的影响 × 中间NG23和NG38
IF 1.8 3区 农林科学 Q2 FORESTRY Pub Date : 2023-06-27 DOI: 10.1080/02827581.2023.2221038
J. P. Skovsgaard, U. Johansson, J. Englund, Stefan Juravle
ABSTRACT This study quantified the effects of different establishment practices on survival, dieback and early growth of Juglans × intermedia NG23 and NG38 planted in a statistically designed field experiment on glacial till in southern Sweden. Establishment practices included the use or absence of nurse trees (Populus maximowiczii × trichocarpa var. OP42 planted one year before J. × intermedia), weed control (2 m2·tree−1) and fertilization (+25 g N·tree−1·year−1). NG23 transplants were smaller than NG38 at the time of planting. The overall survival rate was 97%. NG23 suffered marginally more mortality than NG38. Leader shoot dieback occurred in all treatment combinations but was most severe in the presence of nurse trees. NG23 suffered less dieback than NG38. Annual height growth of trees unaffected by dieback increased with increasing levels of precipitation during the growing season (194–407 mm) and with increasing soil quality in terms of nitrogen (94·10−3–607·10−3 g·g−1), base saturation (14–99%) or available soil water capacity (8.6–30.6 l·m−3). It was negatively influenced by poplar nurse trees and positively by fertilization. Weed control had no impact on height growth, possibly due to inefficient implementation. With nurse trees, NG23 had stronger growth than NG38. The opposite was true without nurse trees. It was hypothesized that less growth and more dieback resulted from competition for water.
摘要本研究量化了不同栽培方式对核桃存活、枯死和早期生长的影响 × 在瑞典南部的一个统计设计的冰原田间试验中种植的中间品种NG23和NG38。建立实践包括使用或不使用护树(Populus maximowiczii × 毛果变种OP42在J。 × 媒介)、杂草控制(2 m2·树−1)和施肥(+25 g N·树−1·年−1)。NG23移植体在种植时比NG38移植体小。总生存率为97%。NG23的死亡率略高于NG38。在所有的治疗组合中都发生了Leader Shot枯死,但在有护树的情况下最为严重。NG23的死亡率低于NG38。未受枯死影响的树木的年高度增长随着生长季节降水量的增加而增加(194-407 mm),土壤质量在氮(94.10−3–607·10−3 g·g−1)、基本饱和度(14–99%)或有效土壤含水量(8.6–30.6 l·m−3)。杨树护树对其有负向影响,施肥对其有正向影响。杂草控制对身高增长没有影响,可能是由于实施效率低下。有护树的情况下,NG23的生长比NG38强。如果没有护树,情况正好相反。据推测,较少的生长和更多的枯死是由于对水的竞争造成的。
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引用次数: 0
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Scandinavian Journal of Forest Research
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