Article
Forestry
Gabriela Ritokova, Douglas B. Mainwaring, David C. Shaw, Yung-Hsiang Lan
Summary: Swiss needle cast is a significant foliage disease of Douglas-fir caused by a native pathogen, with disease severity and foliage retention being correlated with crown depth and distance from the coast. Foliage retention is positively correlated with distance from the coast and elevation, while disease severity is negatively correlated with foliage retention and distance from the coast.
CANADIAN JOURNAL OF FOREST RESEARCH
(2021)
Review
Forestry
David C. Shaw, Gabriela Ritokova, Yung-Hsiang Lan, Doug B. Mainwaring, Andrew Russo, Randy Comeleo, Sarah Navarro, Daniel Norlander, Ben Smith
Summary: Swiss needle cast (SNC) caused by Nothophaeocryptopus gaeumannii is a foliage disease of Douglas-fir that has persisted in coastal Oregon since the mid-1990s, with significant impacts in coastal Washington and southwestern British Columbia. The study emphasizes the need for Douglas-fir tree growers to consider SNC and other emerging foliage diseases as threats to plantation productivity, and for managers to implement effective silvicultural responses to minimize disease impacts. The findings also suggest that regional foliage disease outbreaks can have broader ecological consequences beyond just the trees, with environmental controls on the SNC epidemic indicating potential future impacts of climate change on tree populations at higher elevations.
JOURNAL OF FORESTRY
(2021)
Article
Forestry
David Montwe, Bryan Elder, Peter Socha, Jessica Wyatt, David Noshad, Nicolas Feau, Richard Hamelin, Michael Stoehr, Jurgen Ehlting
Summary: Losses in Douglas-fir due to the fungus Nothophaeocryptopus gaeumannii, causing Swiss needle cast, is expected to worsen in regions with warmer winters and wetter springs. Research indicates that tolerance to this disease is partially genetically controlled. Screening for tolerance in coastal BC Douglas-fir breeding population is possible, but deployment strategies may need to be area-specific due to family rank changes across different environments.
Article
Ecology
Yung-Hsiang Lan, David C. Shaw, E. Henry Lee, Peter A. Beedlow
Summary: This study found that N. gaeumannii has the highest pseudothecia density on 3- and 4-year-old needles in mature trees, in contrast to plantations where pseudothecia density usually peaks on 2-year-old needles. The mature forest canopy and foliage appear to delay the emergence of pseudothecia from the needles, allowing mature trees to retain more needles.
FRONTIERS IN FORESTS AND GLOBAL CHANGE
(2022)
Article
Forestry
Jason Kelley, John A. (Tony) Trofymow, Juha M. Metsaranta, Cosmin N. Filipescu, Christopher Bone
Summary: The research shows that the multi-temporal application of the LiDAR area-based method can effectively detect the effects of fertilization on forest volume, biomass, and height. There were no significant differences in volume or biomass between treatments in both sample plots and LiDAR blocks, but significant differences were detected in height increments between treatments.
Article
Forestry
Jacob D. Putney, Douglas A. Maguire
Summary: This study established fertilization trials in the Coast Range of Oregon to investigate the response of coast Douglas-fir to nitrogen fertilizer. It was found that nitrogen fertilization influenced stem form through interaction with a crown variable, which was mediated by the initial crown length of trees. The results are expected to enhance site-specific growth response predictions.
FOREST ECOLOGY AND MANAGEMENT
(2021)
Article
Plant Sciences
Miha Humar, Viljem Vek, Primoz Oven, Bostjan Lesar, Davor Krzisnik, Eli Kerzic, Miha Hocevar, Robert Brus
Summary: Wood in outdoor applications is vulnerable to decomposition, but measures such as construction details, biocide treatments, wood modification, and selection of durable species can prevent degradation. Imported tree species offer a potential source of wood with better natural durability and resilience to climate change. This study presents data on the overall durability of American Douglas fir grown in Slovenia, showing its potential for outdoor use due to good water exclusion efficacy and extractives content.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Forestry
Douglas B. Mainwaring, Gabriela Ritokova, David C. Shaw, Rachel K. Brooks, Daniel W. Omdal
Summary: Cohort-based live foliage retention of Douglas-fir was estimated in western Oregon and Washington by correlating plot-level estimates with climate, soils, and topography variables. The sampling covered a wide geographical range and time period, with foliage retention correlated with several environmental factors. The study provided insights into potential volume growth loss and factors influencing Douglas-fir foliage retention.
FOREST ECOLOGY AND MANAGEMENT
(2023)
Article
Forestry
Benno Richard Eberhard, Tamara Eckhart, Hubert Hasenauer
Summary: Due to the growing demand for forest resources in Europe, introducing non-native tree species like Douglas-fir presents a potential solution, but proper management knowledge is essential. This study investigates theoretical silvicultural management options for Douglas-fir in central Europe, recommending planting in mono-species patches and active management to maximize productivity.
Article
Engineering, Environmental
Naba Krishna Das, Chanaka M. Navarathna, Jacinta Alchouron, Beatrice Arwenyo, Sharifur Rahman, Brooke Hoffman, Khiara Lee, Sean Stokes, Renel Anderson, Felio Perez, Dinesh Mohan, Charles U. Pittman Jr, Todd Mlsna
Summary: This study evaluated the sorptive removal of molybdate from water using Douglas fir biochar (DFBC) and a hybrid DFBC/Fe3O4 composite. The results showed that DFBC and DFBC/Fe3O4 had high adsorption capacities for molybdate, with values ranging from 459.3-487.9 mg/g and 288-572 mg/g, respectively. The adsorption mechanisms were primarily governed by electrostatic attraction and chemisorption onto magnetite surface hydroxyl groups.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Forestry
Edward Henry Lee, Peter A. Beedlow, J. Renee Brooks, David T. Tingey, Charlotte Wickham, William Rugh
Summary: SNC caused by Nothophaeocryptopus gaeumannii is a major forest disease affecting Douglas-fir stands in PNW, with concerns that the epidemic will worsen with future warming. The effects of SNC on stem growth and physiological responses differ between sites and growth periods, with differences in stomatal conductance and assimilation playing a key role. Rising temperatures since the mid-1970s have directly affected Douglas-fir growth in PNW, influenced by changes in evaporative demand during summer drought and the expanding SNC epidemic regionally.
Article
Forestry
Isabel Miranda, Joana Ferreira, Sofia Cardoso, Helena Pereira
Summary: This study investigated the antioxidant ability and chemical composition of extracts from Douglas-fir bark, cork, and phloem, showing high levels of phenolic compounds and antioxidant capacity. The composition of Douglas-fir bark extracts varied with stem height and geographic location, with terpenoids and sterols being the main components. The detailed knowledge of these extracts demonstrates their potential as a source of fine chemicals for various applications.
Article
Forestry
Maree Brennan, David Hentges, Sylvain Cosgun, Stephane Dumarcay, Francis Colin, Christine Gerardin, Philippe Gerardin
Summary: Softwood species' knotwood is rich in lignans and terpenes, with D-pinitol also present in high concentrations at the crown top. Different softwood species exhibit variability in extractive yields and compositions, with potential bioactive molecules for anti-tumor properties and food-supplement markets.
Article
Environmental Sciences
Alexia Paul, Christophe Hissler, Alessandro Florio, Serge Didier, Benoit Pollier, Gregory van der Heijden, Etienne Dambrine, Jacques Ranger, Bernd Zeller, Arnaud Legout
Summary: In rural areas, nitrate concentrations in surface waters are mainly affected by excess nitrogen fertilizer in agricultural lands. However, Douglas-fir plantations can result in an imbalance in the nitrogen cycle, leading to higher nitrate production in the soil. This study found that streams draining Douglas-fir catchments had significantly higher nitrate concentrations compared to other land covers. Nitrate concentrations in groundwater and soil were also elevated under Douglas-fir. The study suggests that excessive nitrate production under Douglas-fir is responsible for the high nitrate concentrations in stream water.
ENVIRONMENTAL POLLUTION
(2023)
Article
Ecology
Jan-Peter George, Silvio Schueler, Michael Grabner, Sandra Karanitsch-Ackerl, Konrad Mayer, Michael Stierschneider, Lambert Weissenbacher, Marcela van Loo
Summary: Conifers, especially Douglas-fir, show signals of climate adaptation along various climate gradients, with a small proportion of the exome exhibiting truly adaptive signals despite the presence of neutral evolutionary processes. Phenotypic and genomic signals of adaptation to climate are responsible for differentiation in trees, particularly in explaining the disparity between coastal and interior varieties of Douglas-fir.
ECOLOGY AND EVOLUTION
(2021)
Article
Ecology
Leif A. Mortenson, Andrew N. Gray, David C. Shaw
Article
Entomology
M. Miller-Pierce, D. C. Shaw, A. Demarco, P. T. Oester
ENVIRONMENTAL ENTOMOLOGY
(2015)
Article
Forestry
Lisa M. Ganio, Travis Woolley, David C. Shaw, Stephen A. Fitzgerald
Article
Ecology
Garrett W. Meigs, John L. Campbell, Harold S. J. Zald, John D. Bailey, David C. Shaw, Robert E. Kennedy
Article
Forestry
Kathryn H. Hrinkevich, Robert A. Progar, David C. Shaw
Article
Multidisciplinary Sciences
Kathryn H. Hrinkevich, Robert A. Progar, David C. Shaw
Article
Forestry
Gabriela Ritokova, David C. Shaw, Greg Filip, Alan Kanaskie, John Browning, Danny Norlander
Article
Forestry
David C. Shaw, Travis Woolley, Rick G. Kelsey, Brice A. McPherson, Doug Westlind, David L. Wood, Ebba K. Peterson
FOREST ECOLOGY AND MANAGEMENT
(2017)
Article
Ecology
David C. Shaw, Travis Woolley
Article
Plant Sciences
Brandy J. Saffell, Frederick C. Meinzer, Steven L. Voelker, David C. Shaw, J. Renee Brooks, Barbara Lachenbruch, Jennifer McKay
PLANT CELL AND ENVIRONMENT
(2014)
Article
Forestry
Stephen J. Calkins, David C. Shaw, Yung-Hsiang Lan
Summary: Dwarf mistletoe parasitism on western hemlock trees can alter tree crown structure and function, affecting branch foliage and leading to crown compaction. Increasing infection severity results in reduced branch foliage, a higher proportion of foliage distal to infections, and crown volume decreases with deformities dominating.
Review
Forestry
David C. Shaw, Peter A. Beedlow, E. Henry Lee, David R. Woodruff, Garrett W. Meigs, Stephen J. Calkins, Matthew J. Reilly, Andrew G. Merschel, Steven P. Cline, Randy L. Comeleo
Summary: Forest biological disturbance agents (BDAs), such as insects, pathogens, and parasitic plants, can affect tree decline, mortality, and forest ecosystems processes. Recent research suggests that BDAs may not necessarily increase the likelihood or severity of fire, but their role in influencing fuels and fire in fire-prone western US forests is still unclear. This study reviews the existing literature on BDAs and develops a conceptual framework to better understand the complex relationships between BDAs, fuels, and fire. The framework considers the spatiotemporal aspects of BDA life histories and their effects on fuel characteristics, fire outcomes, and forest heterogeneity.
FOREST ECOLOGY AND MANAGEMENT
(2022)
Review
Forestry
Andrew G. Merschel, Peter A. Beedlow, David C. Shaw, David R. Woodruff, E. Henry Lee, Steven P. Cline, Randy L. Comeleo, R. Keala Hagmann, Matthew J. Reilly
Summary: Wildland fires (WLF) are increasing in frequency and severity, impacting society and ecosystems. Ponderosa pine forests in Oregon and Washington are threatened by dense forest structure, climate change, and human population growth. Maintaining disturbance resistance through low-severity disturbances is crucial for the ecological health of these forests.
TREES FORESTS AND PEOPLE
(2021)
Article
Plant Sciences
Kyle R. Pritchard, Joan C. Hagar, David C. Shaw
Review
Plant Sciences
David C. Shaw, Michelle C. Agne
Article
Forestry
Sadadi Ojoatre, Jos Barlow, Suzanne R. Jacobs, Mariana C. Rufino
Summary: This study evaluates the changes in a forest complex in Kenya and finds that within 20 years of disturbance, there is rapid recovery of aboveground biomass and carbon accumulation, and the species diversity remains high in these previously disturbed fragments.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Astor Torano Caicoya, Peter Biber, Miren del Rio, Ricardo Ruiz-Peinado, Catia Arcangeli, Robert Matthews, Hans Pretzsch
Summary: This study analyzed the effects of site and climate on the self-thinning line in Scots pine forests in Europe. The results showed that species tolerance, temperature, and precipitation influenced the slope of the self-thinning line. In terms of the intercept, latitude and radiation had compensating effects. Time did not show significant trends in the self-thinning line. The study highlights the need to adapt management strategies and models based on self-thinning to different latitudes. Climate change has not yet significantly impacted the self-thinning trajectory, but a continuous rise in temperature and high precipitation may accelerate the self-thinning process and result in increased biomass accumulation.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Haonan Zhang, Jianing Xu, Weiqi Meng, Zhonglin Li, Yanyan Ni, Weijie Li, Hao Chen, Xingshuo Zhang, Huanhuan Yuan, Zhi Wang
Summary: Secondary forests play a crucial role in ecosystem dynamics and biodiversity recovery. This study investigated the mechanisms underlying secondary succession in a restored secondary forest and found that deciduous tree species transition from diversity accumulators to repellents as they progress through different life history stages, while evergreen tree species can act as accumulators or remain neutral. The study also revealed the effects of density dependence on the mortality and regeneration of different tree species, and highlighted the importance of early-arriving tree species in facilitating the establishment and diversity of late-arriving counterparts.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Yierxiati Abulaiti, Zijian Huang, Guojiao Xie, Xiaojuan Zou, Qin Luo, Minhuang Wang, Qiong Yang, Ping Hu, Shixiao Yu
Summary: In this study, the resistance to pest infestation of native and exotic mangrove species was compared based on their traits and spectral reflectance. The results showed that exotic species exhibited higher resistance to pest infestation compared to native species.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Thomas Feiss, Vincent Robin, Delphine Aran, Joseph Levillain, Thierry Paul, Jean-Luc Dupouey
Summary: Fagus sylvatica L. is a competitive tree in European temperate deciduous forests, but often sporadic or absent in present-day stands where Quercus spp. are dominant. Through soil charcoal analysis in the Lorraine Plateau in France, the presence of Fagus and Quercus in mature Quercus stands was confirmed. Radiocarbon dating results indicated that historical forest management caused the replacement of Fagus by Quercus, starting from the Bronze Age.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Paula Halbig, Anne-Sophie Stelzer, Peter Baier, Josef Pennerstorfer, Horst Delb, Axel Schopf
Summary: The incidence of oak processionary moth in Central Europe has been increasing, posing severe threats to oak trees, humans, and animals. To address this issue, researchers have developed an online early warning system that provides phenological forecasts and decision support for the protection of oak trees and human health.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Jean-Baptiste Ndamiyehe Ncutirakiza, Sylvie Gourlet-Fleury, Philippe Lejeune, Xavier Bry, Catherine Trottier, Frederic Mortier, Adeline Fayolle, Francois Muhashy Habiyaremye, Leopold Ndjele Mianda-Bungi, Gauthier Ligot
Summary: This study examines the influence of canopy structure on tropical tree growth using data collected through unmanned aerial vehicles (UAVs) and field measurements. The results show that combining UAV and field data can improve the prediction of tree diameter increment. Diameter at breast height and crown area are complementary predictors, and crown-based competition indices significantly enhance prediction models. The calibrated model at one site can accurately predict growth at another site.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Abebe Damtew, Emiru Birhane, Christian Messier, Alain Paquette, Bart Muys
Summary: Restoring degraded dryland requires a diverse mixture of trees and shrubs. Shading and species diversity can improve seedling survival and vitality. Shaded conditions led to higher seedling survival, vitality, and chlorophyll content, while increasing species richness improved seedling vitality in non-shaded conditions.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Francois Hebert, Isabelle Delisle, Marc Tremblay, Pascal Tremblay, Jean- Francois Boucher, Yan Boucher, Daniel Lord
Summary: Regeneration failures in the closed-crown boreal forest, resulting in the creation of open lichen woodlands, can be restored through clear-cutting, scarification, and natural seeding. Clear-cutting combined with scarification promotes seedling establishment, and scarification creates suitable microsites for germination. Seedling growth in lichen woodlands is higher when logging and scarification are combined, but lower compared to feather moss stands. Afforestation through natural seeding following scarification could be a cost-effective option for restoring lichen woodlands.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Bianca Wulansari Kassun, A. Maarit I. Kallio, Erik Tr Omborg, Meley Mekonen Rannestad
Summary: Mapping and analyzing forest ecosystem services in dry and mountain forests can provide valuable knowledge for sustainable forest management strategies.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Michael Premer, Eric Turnblom, Aaron Weiskittel
Summary: Managed forests serve as a natural climate change solution by sequestering carbon and storing it in harvested wood products, while also providing ecosystem services and wildlife habitat. This study focused on the stem sinuosity of juvenile coastal Douglas-fir and found that genetic improvement, silviculture practices, and local growing conditions can impact stem sinuosity. Factors such as tree spacing, vegetation control, and climate variables also affect the severity of stem sinuosity.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Bronwyn Lira Dyson, Rhea Herpel, Peter Karasch, Jorg Mueller, Dominik Thom, Claus Baessler
Summary: The study aimed to assess the effects of different forest management strategies, dead wood types, and microclimates on Fomes fomentarius. The results showed that the occupancy of Fomes fomentarius was lower in control stands, while the percent cover occupied on snags under a closed canopy was higher. Increasing the number of snags and maintaining dense forest canopies could enhance the presence of Fomes fomentarius as well as provide important microhabitats for various arthropods.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Di Liu, Chaofan Zhou, Xiao He, Xiangdong Lei, Huiru Zhang, Xianzhao Liu
Summary: Canopy structure plays a significant role in the distribution and growth of saplings. Traditional canopy metrics are inadequate in irregular stands. The innovative framework of canopy triangular units provides a comprehensive understanding of the canopy's three-dimensional attributes. Through this framework, we can analyze the differences in various triangular unit types and the spatial dispersion of saplings.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Amalia Valeria Ibanez Moro, Fabian Borghetti, Leonardo Galetto, Juan M. Cellini, Sandra J. Bravo
Summary: This study evaluated the size and persistence of soil seed banks (SSB) of six native woody species in dry subtropical forests of the western Argentine Chaco region. The results showed that SSB size was influenced by different sites and sampling years, and forest disturbances had varying effects on SSB.
FOREST ECOLOGY AND MANAGEMENT
(2024)
Article
Forestry
Stephanie Landry, Marc-Andre Villard, Gaetan Pelletier, Martin-Hugues St-Laurent
Summary: In many regions of the world, excessive browsing by ungulates has reached unsustainable levels, threatening biodiversity and forest regeneration. Moose, as ecological engineers, have severe impacts on forest structure and composition through overbrowsing. The distribution of forage and cover patches affects moose browsing pressure, and this relationship has been explored in conifer-dominated stands but not in hardwood-dominated landscapes.
FOREST ECOLOGY AND MANAGEMENT
(2024)