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Modelling intra- and inter-annual growth dynamics of Scots pine in the whole-tree carbon framework 在全树碳框架中模拟苏格兰松的年际生长动态
Pub Date : 2017-04-19 DOI: 10.14214/df.234
Pauliina Schiestl-Aalto
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引用次数: 1
Optimization of early cleaning and precommercial thinning methods in juvenile stand management of Norway spruce stands 挪威云杉幼林管理中早期清洁和商业前间伐方法的优化
Pub Date : 2017-01-27 DOI: 10.14214/DF.231
Karri Uotila
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引用次数: 13
Dynamic variations in bark hydraulics - understanding whole tree processes and its linkage to bark hydraulic function and structure 树皮水力力学的动态变化——理解整个树的过程及其与树皮水力功能和结构的联系
Pub Date : 2016-11-04 DOI: 10.14214/DF.229
Tommy Chan
A mature tree stem generally consists of a column of wood that is composed of a series of annual incremental layers and enclosed in a covering of bark. The dynamic variations of the bark are complex due to its structure and function: the thick outer-bark acts as a protective barrier against the abiotic and biotic environment; while the phloem is where sugar transport occurs. Much of the bark variation is due to the transport of sugars and its related processes. The driving force for sugar transport in the phloem is generated by the accumulation of sugars at source sites (e.g. leaves), which creates differences in gradients in turgor pressure along the stem. As a result, mass flow occurs – transporting sugars to sink regions that require it (e.g. stem and roots) for active growth, respiration and storage. The xylem pathway, which transports water in the opposite direction, is connected to the phloem in parallel along the entire length of the stem. The immediate connection between these two transport pathways suggests a functional linkage, as the phloem draws water from the xylem in order for mass flow to occur. The dynamic interactions between the xylem and phloem, and the processes occurring within the bark have great implications for whole tree physiology. The purpose of this thesis is to study the dynamic processes that occur within the bark and its interaction with other internal tree processes and the external environment. This is accomplished by first understanding the bark hydraulic architecture and its linkage to the environment, followed by its linkage to various tree processes. These linkages have not been thoroughly quantified, especially on an intra-annual (e.g. daily) scale. The study of bark hydraulic dynamics is of great interest because it is a relatively new topic with great potential. The changes of the bark in response to the environment may play a large part as a regulator to other tree processes. The thesis consists of four papers, of which one is a modelling paper and three are experimental (field and laboratory) studies. The model estimates growth by using dendrometer measurements as inputs for the model. Growth is estimated by separating the water-related influences from measured inner-bark, revealing a growth signal – proxy for cambial stem growth. Using this growth signal, a correlation study to microclimate variables is examined in one paper; and to assumed growth respiration in a second paper. The remaining two papers explore the seasonality of photosynthesis and respiration, and bark stem dynamics during the spring recovery period in the spring. As a conclusion of this thesis, these four papers show how inextricably linked, the individual tree processes are to the changes within the bark, due to the tight coupling with sap flow-related changes of the xylem. The culmination of this thesis opens new opportunities to further understand the dynamics of bark hydraulics and ecophysiological processes by implementing field me
一棵成熟的树干通常由一根木头柱组成,这根木头柱由一系列每年递增的层组成,并被树皮覆盖。由于树皮的结构和功能,其动态变化是复杂的:厚厚的外树皮对非生物和生物环境起着保护屏障的作用;韧皮部是糖运输发生的地方。大部分树皮的变异是由于糖的运输及其相关过程。韧皮部中糖运输的驱动力是由糖在来源部位(如叶片)的积累产生的,这在茎干上产生了膨胀压力梯度的差异。因此,发生了质量流——将糖运送到需要它的区域(如茎和根)以进行积极生长、呼吸和储存。沿着茎的整个长度,木质部通道与韧皮部平行连接,以相反的方向运输水分。这两种运输途径之间的直接联系表明了一种功能联系,因为韧皮部从木质部吸取水分以便发生质量流动。木质部和韧皮部之间的动态相互作用以及树皮内部发生的过程对整个树木的生理具有重要意义。本论文的目的是研究树皮内部发生的动态过程及其与其他内部树木过程和外部环境的相互作用。这是通过首先了解树皮的水力结构及其与环境的联系来实现的,其次是它与各种树木过程的联系。这些联系还没有完全量化,特别是在年内(例如每日)尺度上。树皮水力动力学是一个较新的研究课题,具有很大的发展潜力,引起了人们的广泛关注。树皮的变化对环境的反应可能在调节树木的其他过程中起很大的作用。论文由四篇论文组成,其中一篇是模型论文,三篇是实验(现场和实验室)研究。该模型通过使用树枝计测量值作为模型的输入来估计生长。通过从测量的内层树皮中分离水相关影响来估计生长,揭示形成层茎生长的生长信号代理。利用这一生长信号,对小气候变量进行了相关性研究;在第二篇论文中假设生长呼吸作用。其余两篇论文探讨了光合作用和呼吸作用的季节性,以及春季恢复期间树皮茎的动态。作为本文的结论,这四篇论文表明,由于木质部与汁液流相关的变化紧密耦合,单个树木过程与树皮内部的变化是如何密不可分的。本论文的高潮为通过实施现场测量和最先进的建模,进一步了解树皮液压和生态生理过程的动力学提供了新的机会。
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引用次数: 0
The role of terpenes in carbon and nitrogen cycling in boreal forest soils. 萜烯在北方森林土壤碳氮循环中的作用。
Pub Date : 2016-10-28 DOI: 10.14214/DF.228
S. Adamczyk
Cycling of carbon (C) and nutrients plays pivotal role for functioning of every ecosystem. Biogeochemical cycles of carbon and nitrogen (N) are balanced by a network of interactions between plants, litter and soil chemistry, microbial communities, enzyme machinery and climate conditions. This thesis focuses on the role of terpenes in C and N transformations in boreal forest soils. Terpenes are abundant plant secondary compounds. The focus was on certain mono-, di-, and triterpenes. Soil incubation experiments revealed that terpenes increased the mineralization of carbon but decreased net nitrogen mineralization and net nitrification. Additionally they increased the amounts of carbon and nitrogen in the microbial biomass through enhancement of bacterial growth; however, they inhibited fungal growth. This study suggests that terpenes can act as a C source for some microbial communities. Moreover, terpenes showed inhibitory potential against enzymes, which are involved in C, N, P, S cycling. The mechanism of inhibition seems to be based at least partially on ability of terpenes to bind enzymes. The field experiment presented the effect of logging residues and wood ash on composition of terpenes and C and N cycling in soil five years after clear-cutting a Norway spruce stand. Logging residue treatment increased the concentrations of certain terpenes in the organic layer. Both, logging residue and wood ash treatments increased net N mineralization and net nitrification. Some changes in terpene concentrations correlated with C and N cycling processes, but the relationship between terpene concentration and C and N cycling processes remained still unclear in the field conditions. In conclusion, terpenes can affect C and N transformations in boreal forest soil. It is probable that terpenes change N cycling retaining more N in organic forms and potentially decrease nitrogen losses from forest ecosystem.
碳(C)和营养物质的循环对每个生态系统的功能起着关键作用。碳和氮(N)的生物地球化学循环通过植物、凋落物和土壤化学、微生物群落、酶机制和气候条件之间的相互作用网络来平衡。本文主要研究了萜烯在北方森林土壤碳氮转化中的作用。萜烯是丰富的植物次生化合物。重点是某些单萜、二萜和三萜。土壤培养试验表明,萜烯增加了碳矿化,但降低了净氮矿化和净硝化作用。此外,它们通过促进细菌生长增加了微生物生物量中的碳和氮的数量;然而,它们抑制了真菌的生长。本研究提示萜烯可以作为某些微生物群落的C源。此外,萜烯对参与碳、氮、磷、硫循环的酶具有抑制作用。抑制的机制似乎至少部分是基于萜烯结合酶的能力。通过田间试验,研究了伐后5年挪威云杉林分采伐后,采伐剩余物和木灰对土壤萜类成分和碳氮循环的影响。采伐残渣处理增加了有机层中某些萜烯的浓度。伐渣和木灰处理均能提高净氮矿化和净硝化作用。萜烯浓度的一些变化与碳氮循环过程相关,但在田间条件下萜烯浓度与碳氮循环过程的关系尚不清楚。综上所述,萜烯能够影响北方森林土壤中碳、氮的转化。萜烯可能改变了氮循环,以有机形式保留了更多的氮,并可能减少森林生态系统中氮的损失。
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引用次数: 1
Developing laser scanning applications for mapping and monitoring single tree characteristics for the needs of urban forestry 开发激光扫描应用于测绘和监测单株树木的特征,以满足城市林业的需要
Pub Date : 2016-10-28 DOI: 10.14214/DF.230
Topi Tanhuanpää
Urban forests provide various ecosystem services. However, they also require fairly intensive management, which can be supported with up-to-date tree-level data. Until recently, the data have been collected using traditional field measurements. Laser scanning (LS) techniques provide efficient means for acquiring detailed three-dimensional (3D) data from the vegetation. The objective of this dissertation was to develop methods for mapping and monitoring urban forests at tree level. In substudy I, a method (MS-STI) utilizing multiple data sources was developed for extracting tree-level attributes. The method combined airborne laser scanning (ALS), field measurements, and tree locations. The field sample was generalized using the non-parametric nearest neighbor (NN) approach. The relative root mean square error (RMSE) of diameter at breast height (DBH) varied between 18.8–33.8%. The performance of MS-STI was assessed in substudy II by applying it to an existing tree register. 88.8% of the trees were successfully detected, and the relative RMSE of DBH for the most common diameter classes varied between 21.7–24.3%. In substudy III, downed trees were mapped from a recreational forest area by detecting changes in the canopy. 97.7% of the downed trees were detected and the commission error was 10%. Species group, DBH, and volume were estimated for all downed trees using ALS metrics and existing allometric models. For the DBH, the relative RMSE was 20.8% and 34.1% for conifers and deciduous trees respectively. Finally, in substudy IV, a method utilizing terrestrial laser scanning (TLS) and tree basic density was developed for estimating tree-level stem biomass for urban trees. The relative RMSE of the stem biomass estimates varied between 8.4–10.5%. The dissertation demonstrates the applicability of LS data in assessing tree-level attributes for urban forests. The methods developed show potential in providing the planning and management of urban forests with cost-efficient and up-to-date tree-level data.
城市森林提供各种生态系统服务。然而,它们也需要相当密集的管理,这可以用最新的树级数据来支持。直到最近,这些数据都是使用传统的现场测量方法收集的。激光扫描(LS)技术为获取植被的详细三维数据提供了有效手段。本文的目的是发展城市森林在树木水平上的制图和监测方法。在子研究1中,开发了一种利用多数据源提取树级属性的方法(MS-STI)。该方法结合了机载激光扫描(ALS)、现场测量和树木定位。采用非参数最近邻(NN)方法对现场样本进行广义化。胸高直径的相对均方根误差(RMSE)在18.8 ~ 33.8%之间。子研究II通过将MS-STI应用于现有的树寄存器来评估其性能。88.8%的树木被成功检测,最常见径级的胸径相对RMSE在21.7% ~ 24.3%之间。在子研究III中,通过检测林冠的变化,从一个休闲林区绘制了被砍伐树木的地图。97.7%的树木被检测到,委托误差为10%。利用ALS指标和现有异速生长模型对所有倒下树木的物种群、胸径和体积进行了估计。对于胸径,针叶树和落叶树的相对RMSE分别为20.8%和34.1%。最后,在子研究IV中,建立了基于地面激光扫描(TLS)和树木基本密度的城市树木树干生物量估算方法。茎生物量估计值的相对RMSE在8.4 ~ 10.5%之间。本文论证了LS数据在城市森林树级属性评估中的适用性。所制订的方法显示出在为城市森林的规划和管理提供具有成本效益的最新树木数据方面的潜力。
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引用次数: 1
Changing institutions and consumer-driven development of forest products and services 制度变革和消费者驱动的林产品和服务发展
Pub Date : 2016-09-02 DOI: 10.14214/DF.223
J. Holopainen
The forest sector has been able to develop many new bio-based and sustainable products catered to business-to-business markets, but the sector still lacks a breakthrough in new forest products and services targeting consumer markets. This is due to higher prices of forest products compared to competing materials, such as concrete, steel, and plastics, but also due to a lack of new product and service innovations targeting end-consumer markets. To understand the emergence of bioeconomy, also bringing new consumer market opportunities to the forest sector, we need to understand the new business ecosystem. The business ecosystem model is a holistic view of the current institutions capturing stakeholder relations and opportunities brought by various resources and technologies. Better understanding of these concepts can lead to consumer-driven development of forest products and services, and improved competitive advantage. This doctoral dissertation introduces a holistic research and development model for new product and service innovations in the forest sector. This research was motivated by the fact that recent forest sector product introductions have been driven by the technology push, and therefore, this research concentrates on the consumer perspective to build new business models and the development of products and services to meet current consumer trends. Evolving sustainability trends among consumers, where bio-based forest products and services can fulfill consumer demand, are central in this thesis. The doctoral thesis consists of one book chapter and three peer-reviewed articles, each using different methodologies. The subjects and results of the papers are grouped into three themes in the framework of the Consumer-Driven Business Ecosystem Research and Development (CDBERD) model. The model extends the classical “technology-push and demand-pull” innovation model, to better consider consumer values, enabling resources and dominant logics along with the smooth flow of information during each phase of the research and development process leading towards new consumer-driven solutions.
森林部门已经能够开发出许多适应企业对企业市场的新型生物基可持续产品,但该部门在针对消费者市场的新型森林产品和服务方面仍然缺乏突破。这是由于与混凝土、钢铁和塑料等竞争材料相比,林产品的价格更高,但也是由于缺乏针对终端消费者市场的新产品和服务创新。要理解生物经济的出现,以及为林业部门带来新的消费市场机会,我们需要了解新的商业生态系统。商业生态系统模型是对现有制度的整体观察,捕捉各种资源和技术带来的利益相关者关系和机会。更好地了解这些概念可以导致消费者推动森林产品和服务的发展,并提高竞争优势。这篇博士论文介绍了森林部门新产品和服务创新的整体研发模式。这项研究的动机是,最近森林部门产品的引进是由技术推动的,因此,这项研究侧重于消费者的观点,以建立新的商业模式和开发产品和服务,以满足当前的消费趋势。在消费者中不断变化的可持续性趋势,其中生物基林产品和服务可以满足消费者的需求,是本论文的中心。博士论文由一本书的一章和三篇同行评议的文章组成,每篇文章使用不同的方法。论文的主题和结果在消费者驱动的商业生态系统研究与发展(CDBERD)模型的框架中分为三个主题。该模型扩展了经典的“技术推动和需求拉动”创新模式,更好地考虑了消费者的价值,使资源和主导逻辑以及信息在研发过程的每个阶段都能顺利流动,从而产生新的消费者驱动的解决方案。
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引用次数: 2
The ecosystem services approach in corporate sustainability: results from industrial plantation forestry in China 企业可持续发展中的生态系统服务方法:来自中国工业人工林的结果
Pub Date : 2016-08-19 DOI: 10.14214/df.221
D. D’Amato
The concept of ecosystem services, wide-spread in academia and policy making, emphasizes societal and economic dependence on natural systems for, among others, provision of food, fibres and water, regulation of climate and soil, and contribution to spiritual and cultural values. Anthropogenic pressures driven by rapid economic development are, however, causing a disruption in the benefits that humans obtain from ecosystems. Several economic sectors both depend on and impact ecosystem services. There is therefore maturing expectation for the private sector involvement in environmental governance worldwide, as firms are increasingly motivated to pursue sustainability for financial or strategic opportunities. This dissertation is among the first to address the current research void on the interactions between industries and ecosystem services. The topic is analysed in the context of extensive plantation forestry in the emerging economy of China. The main aim of this work is to investigate if and how the ecosystem services narrative can contribute to further develop corporate sustainability agendas and practices. Based on the findings from this work, ecosystem services research can provide insights and tools to pursue a more comprehensive and holistic acknowledgement of and response to interlinked ecological and social issues in corporate sustainability. For instance it can enable the understanding of company impacts and dependencies on ecosystems, and associated business risks and opportunities; deepen the analysis of company stakeholders’ perspectives and expectations; contribute to the design of sustainability-oriented practices; and enrich corporate disclosure practices. Further operationalisation of the ecosystem services approach into corporate sustainability would require a more systematic assessment and comparison of the relations between relevant business sectors and ecosystems, the analysis of global-local trade-offs, the internalizations of concepts such as ecological limits and ecological resilience, and the elaboration of suitable corporate and industrial response strategies.
生态系统服务的概念在学术界和政策制定中广泛传播,强调社会和经济对自然系统的依赖,其中包括提供食物、纤维和水,调节气候和土壤,以及对精神和文化价值的贡献。然而,由经济快速发展驱动的人为压力正在破坏人类从生态系统中获得的利益。一些经济部门既依赖又影响生态系统服务。因此,对私营部门参与全球环境治理的期望日益成熟,因为企业越来越有动力追求财务或战略机会的可持续性。本文是第一批解决当前产业与生态系统服务之间相互作用研究空白的论文之一。本课题是在中国新兴经济中粗放型人工林的背景下进行分析的。这项工作的主要目的是调查生态系统服务叙述是否以及如何有助于进一步发展企业可持续发展议程和实践。基于这项工作的发现,生态系统服务研究可以为企业可持续发展中相互关联的生态和社会问题提供更全面和全面的认识和响应。例如,它可以帮助理解公司对生态系统的影响和依赖,以及相关的业务风险和机会;深化对公司利益相关者的观点和期望的分析;为可持续发展实践的设计做出贡献;丰富公司信息披露实践。将生态系统服务方法进一步应用到企业可持续发展中,需要对相关商业部门和生态系统之间的关系进行更系统的评估和比较,分析全球与地方之间的权衡,将生态限制和生态复原力等概念内部化,并制定适当的企业和工业应对战略。
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引用次数: 0
Beaver in the drainage basin : an ecosystem engineer restores wetlands in the boreal landscapes 河狸在流域:生态系统工程师恢复湿地在北方景观
Pub Date : 2016-06-10 DOI: 10.14214/DF.220
Mia Vehkaoja
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引用次数: 4
A service-dominant perspective on payment for ecosystem service offerings 以服务为主导的生态系统服务产品支付视角
Pub Date : 2016-05-20 DOI: 10.14214/DF.219
B. D. Matthies
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引用次数: 1
On the high road to future forest sector competitiveness 在通往未来森林部门竞争力的大道上
Pub Date : 2016-05-06 DOI: 10.14214/df.217
J. Korhonen
International industrial competitiveness depends on many aspects. It can be based on cost advantages over international competitors, which are realized as higher market shares and increased trade flows in global markets. Competitiveness can also be improved by creating higher value through increased product quality and by means of sustainability. This places increasing strategic importance on scarcening natural resources and on how proactively environmental responsibility is perceived in the international forest sector in the future; as an additional cost or more as an opportunity of a high road to competitiveness? The goal of this dissertation is to analyze international competitiveness and its drivers from five different perspectives at the regional, country, and firm levels, with an emphasis on the pulp and paper industry. The empirical research problems of five individual research articles are approached by combining quantitative and qualitative data analyses. The time period from 1990 to 2030 was covered in the analyses. The results highlight the importance of forests, markets, and regulation in creating competitive advantages at different levels in the sector. The traditional forest sector factors such as resource availability and traditional economic factors such price competitiveness are going to play an important role also in the future. However, sustainability will become increasingly important for the value creation opportunities of industries. It is an opportunity for companies in their global value chains if the global environmental awareness and societal demand for sustainability continue to increase. Therefore, more responsible use of global forest resources can offer solutions to global sustainability challenges, and in the transition to a bioeconomy in which the forest industry plays a key role.
产业的国际竞争力取决于许多方面。它可以基于相对于国际竞争对手的成本优势,这种优势通过在全球市场上获得更高的市场份额和增加的贸易流量来实现。竞争力也可以通过提高产品质量和可持续性创造更高的价值来提高。这使稀缺的自然资源以及今后国际森林部门如何积极地认识到环境责任具有日益重要的战略意义;作为一种额外的成本,还是作为一种通往竞争力之路的机会?本论文的目的是分析国际竞争力及其驱动因素从五个不同的角度在区域,国家和企业层面,重点是纸浆和造纸行业。采用定量与定性相结合的数据分析方法,探讨了五篇独立研究论文的实证研究问题。这些分析涵盖了1990年至2030年这段时间。研究结果强调了森林、市场和监管在该部门不同层面创造竞争优势方面的重要性。传统的森林部门因素,如资源可得性和传统的经济因素,如价格竞争力,在未来也将发挥重要作用。然而,可持续性对于行业的价值创造机会将变得越来越重要。如果全球环保意识和社会对可持续发展的需求继续增加,这对处于全球价值链中的公司来说是一个机会。因此,更负责任地利用全球森林资源可以为全球可持续性挑战提供解决方案,并在向生物经济过渡的过程中发挥关键作用。
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引用次数: 1
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Dissertationes Forestales
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