Article
Forestry
K. M. Littke, S. M. Holub, R. A. Slesak, W. R. Littke, E. C. Turnblom
Summary: Intensive forest management has varying impacts on the survival and growth of young Douglas-fir stands, affecting stand biomass due to microclimate and limited resource competition. Site differences in growth may be attributed to factors such as planting density and climate. Vegetation control treatments can have beneficial effects on Douglas-fir growth under different conditions.
FOREST ECOLOGY AND MANAGEMENT
(2021)
Article
Biochemistry & Molecular Biology
Caroline Teyssier, Odile Rogier, Stephane Claverol, Florian Gautier, Marie-Anne Lelu-Walter, Harold Durufle
Summary: This study presents the first large-scale proteomic analysis of Douglas fir, revealing the protein composition and distribution in different plant organs or tissues. The findings provide an important foundation for future genomic annotations of conifers and other trees.
Article
Forestry
Kevin J. Barrett, Jeffery B. Cannon, Alex M. Schuetter, Antony S. Cheng
Summary: This study examines the impact of collaborative adaptive management strategies on restoration outcomes in ponderosa pine-dominated forests, finding that while restoration treatments improve aspects of forest structure related to stand density, they do not fully meet objectives related to forest composition and horizontal structural complexity goals._CAM processes were effective at improving outcomes related to forest density over implementation time, but novel tools and approaches may be required for outcomes related to forest composition and horizontal structural complexity to better align with restoration objectives.
FOREST ECOLOGY AND MANAGEMENT
(2021)
Article
Plant Sciences
Christopher E. Looney, Wilfred J. Previant, John B. Bradford, Linda M. Nagel
Summary: Tree-species mixture effects have been found to increase individual-tree productivity, lessen mortality, and improve recruitment in forests worldwide. In high-elevation mixed-conifer communities in the Interior West US, mixed effects of trembling aspen and conifers may impact tree growth and recruitment, particularly at high relative densities.
JOURNAL OF ECOLOGY
(2021)
Article
Multidisciplinary Sciences
Rezwana Assad, Zafar Ahmad Reshi, Irfan Rashid
Summary: This study aimed to improve the success rate of forest landscape restoration by investigating and selecting two promising ectomycorrhizal fungal species and determining their optimal growth conditions. The findings of this study can contribute to the successful implementation of forest restoration programs.
SCIENTIFIC REPORTS
(2022)
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
Forestry
Jeffrey M. M. Kane, Lucy P. P. Kerhoulas, Gabriel S. S. Goff
Summary: The study found that stand conditions and thinning treatments can affect foliar moisture content in Oregon white oak and Douglas-fir, and that there is spatial variation in tree physiology and foliar moisture content. This has implications for other ecosystems.
INTERNATIONAL JOURNAL OF WILDLAND FIRE
(2023)
Article
Forestry
Jill J. Beckmann, Rosemary L. Sherriff, Lucy P. Kerhoulas, Jeffrey M. Kane
Summary: In a study of an oak woodland in the North Coast of California, Oregon white oak was found to be more resistant to prolonged drought compared to Douglas-fir, with the white oak's drought resistance declining with increasing Douglas-fir competition and increasing with oak competition. The growth of Oregon white oak and Douglas-fir was influenced by different seasonal climate factors, but both species were more limited by Douglas-fir competition than climate.
FOREST ECOLOGY AND MANAGEMENT
(2021)
Article
Green & Sustainable Science & Technology
Aldo Rafael Martinez-Sifuentes, Jose Antonio Hernandez-Herrera, Luis Manuel Valenzuela-Nunez, Edwin Amir Briceno-Contreras, Ulises Manzanilla-Quinones, Argel Gastelum-Arellanez, Ramon Trucios-Caciano, Magali Jeaneth Lopez Calderon
Summary: This study models the habitat suitability and identifies suitable areas for the conservation of Pseudotsuga menziesii in Mexico. The analysis considers current and future distributions, as well as relevant environmental variables. The findings provide important information for the preservation of this species.
Article
Ecology
Tanvir Ahmed Shovon, Daniel Gagnon, Mark C. Vanderwel
Summary: The study indicates that regeneration of white spruce seedlings in water-limited areas is sensitive to both light availability and local competition, with competition exacerbating the effects of drought on seedlings.
Article
Forestry
Mojgan Mahdizadeh, Will Russell
Summary: The study found that coast redwood exhibited the highest survival and recovery rates following the wildfire in the Santa Cruz Mountains, while the recovery of understory plant species was modest. The decline of Douglas-fir is of concern, suggesting that repeated high severity fires driven by climate change could eventually lead to vegetation type conversion.
Article
Ecology
Claire A. Qubain, Yuriko Yano, Jia Hu
Summary: This study explored nitrogen dynamics within mature Douglas-fir trees and found that the majority of nitrogen used for new growth originated from the soils rather than aboveground storage. This suggests a tight coupling between soil available nitrogen and nitrogen uptake in the ecosystem.
Article
Forestry
Kyra Clark-Wolf, Philip E. Higuera, Kimberley T. Davis
Summary: By studying the post-fire seedling demography, this research reveals the mechanisms of post-fire tree regeneration and forest resilience to wildfires. The study found that moderate post-fire climate conditions and diverse microsites facilitate the regeneration of conifer seedlings and enhance their survival.
FOREST ECOLOGY AND MANAGEMENT
(2022)
Article
Biotechnology & Applied Microbiology
Giang Thi Ha Vu, Hieu Xuan Cao, Martin Hofmann, Wilfried Steiner, Oliver Gailing
Summary: This study investigated the contribution of DNA methylation to the phenotypic plasticity in the growth performance of long-lived trees. The analysis of DNA genotyping, DNA methylation, and mRNA sequencing revealed differentially expressed genes and differentially methylated loci associated with fitness-related processes. These findings provide insights into the specialized regulation mechanisms of long intron genes and the role of DNA repetitive sequences in growth-associated DNA methylation regulation.
PLANT BIOTECHNOLOGY JOURNAL
(2023)
Article
Forestry
Archana Gauli, Prem Raj Neupane, Philip Mundhenk, Michael Koehl
Summary: Tree ring analyses were used to investigate the growth performance of different tree species in northern Germany and their response to climate variables. The study found that the growth response of each tree species to climate was species-specific and varied over time. Future climate projections indicate that the growth of Norway spruce could be negatively affected by increased temperature and decreased summer precipitation.
Article
Soil Science
S. A. Boczulak, B. J. Hawkins, D. G. Maynard, R. Roy
CANADIAN JOURNAL OF SOIL SCIENCE
(2015)
Article
Biochemistry & Molecular Biology
J. M. Kranabetter, B. J. Hawkins, M. D. Jones, S. Robbins, T. Dyer, T. Li
Article
Forestry
B. J. Hawkins, Melanie D. Jones, J. M. Kranabetter
Article
Plant Sciences
B. J. Hawkins, E. May, S. Robbins
Biographical-Item
Forestry
B. J. Hawkins
CANADIAN JOURNAL OF FOREST RESEARCH
(2018)
Article
Plant Sciences
J. Marty Kranabetter, Rachael Harman-Denhoed, Barbara J. Hawkins
Article
Agronomy
B. J. Hawkins, S. Robbins
Article
Forestry
E. Lerstrup-Pedersen, O. C. Pedersen, S. Deluca, B. J. Hawkins
CANADIAN JOURNAL OF FOREST RESEARCH
(2019)
Article
Plant Sciences
John Marty Kranabetter, Kate McKeown, Barbara J. Hawkins
Summary: The changes in tree-ring delta N-15 after stand-level disturbances vary among different study sites, possibly due to contrasting soil N availability. The vulnerability of low C:N soils with open N cycles to post-disturbance N losses is highlighted by sharp increases in tree-ring delta N-15, indicating substantial risk of N depletion from productive rainforest ecosystems with multiple harvesting cycles.
JOURNAL OF ECOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Kennedy Boateng, Barbara J. Hawkins, Alvin Yanchuk, Christin Fellenberg, C. Peter Constabel
Summary: The study investigated the effects of nitrogen availability and wounding on the concentrations of oregonin and condensed tannins in red alder genotypes. It showed that these defense compounds are largely influenced by genotype, with a negative correlation between leaf N concentration and oregonin levels. Additionally, neither of the phenolic compounds responded to wounding, indicating that oregonin and condensed tannins are likely constitutive defenses determined by genotype in red alder.
JOURNAL OF CHEMICAL ECOLOGY
(2021)
Article
Plant Sciences
Geraldine Gourlay, Barbara J. Hawkins, Andreas Albert, Jorg-Peter Schnitzler, C. Peter Constabel
Summary: In this study, it was demonstrated that condensed tannins (CTs) act as physiological antioxidants, protecting against oxidative and cellular damage caused by drought and UV-B irradiation. Poplar trees with high CT content showed reduced damage and oxidative stress, while low-CT trees were more susceptible to drought-induced oxidative stress. These findings suggest that CTs play a significant role in defense against oxidative stress in forest systems exposed to various abiotic stresses.
PLANT CELL AND ENVIRONMENT
(2022)
Article
Forestry
Barbara J. Hawkins, Samantha Robbins
Summary: This study compared the nitrogen uptake of ectomycorrhizal (EM) and nonmycorrhizal roots in lodgepole pine seedlings, finding that EM roots exhibited net NH4+ uptake while nonmycorrhizal roots showed NH4+ efflux. Seedlings associated with L. bicolor had higher N content. Future research should focus on a greater variety of EM species for exploring differences in N uptake.
CANADIAN JOURNAL OF FOREST RESEARCH
(2022)
Article
Plant Sciences
M. Claire McPolin, J. Marty Kranabetter, Tim J. Philpott, Barbara J. Hawkins
Summary: This study examined the community composition of endemic and cosmopolitan ectomycorrhizal fungi (EMF) species in the rainforests of British Columbia. The results showed that endemic species have higher concentrations of nitrogen, potassium, and magnesium in their sporocarps compared to cosmopolitan species. Endemic species are more likely to occur on Tsuga heterophylla, and the families Inocybaceae and Thelephoraceae have a high proportion of endemic taxa. These findings highlight the important contribution of endemic fungi to rainforest nutrition and productivity.
Article
Plant Sciences
B. J. Hawkins, J. M. Kranabetter
Article
Ecology
Y. Peng, V. K. Arora, W. A. Kurz, R. A. Hember, B. J. Hawkins, J. C. Fyfe, A. T. Werner
Article
Plant Sciences
Elmira Jalilzadeh Khoie, Zohreh Jabbarzadeh, Parviz Norouzi, Mohsen Barin, Maryam Razavi
Summary: This study investigated the impact of silicon on plant traits of rose plants and found that silicon treatment can improve flowering stem length and diameter, petal thickness, flower weight, and delay flower senescence. Foliar application of silicon also increased leaf content of nitrogen, phosphorus, potassium, calcium, and silicon.
JOURNAL OF PLANT NUTRITION
(2024)
Article
Plant Sciences
Daocheng Ma, Weichao Teng, Yi-Ting Mo, Biao Yi, Wen-Lang Chen, Yan-Ping Pang, Linghui Wang
Summary: This study investigated the nutrient requirements and effects of fertilization on the soil properties and growth status of Erythropalum scandens seedlings through a series of pot experiments. The results revealed that E. scandens seedlings have a stronger sensitivity to nitrogen levels, and excessive fertilization can lead to soil acidification. Proper fertilization treatments can promote better growth status of the seedlings.
JOURNAL OF PLANT NUTRITION
(2024)
Article
Plant Sciences
Javid Norouzi, Saeed Sayfzadeh, Davood Eradatmand Asli, Hamidreza Zakerin, Esmaeil Hadidi Masouleh
Summary: The effect of nitrogen splitting and different irrigation conditions on agronomic and physiological traits of corn was examined. Drought stress resulted in decreased yield, increased proline and abscisic acid contents. The Maxima cultivar exhibited higher resistance to drought stress. Single cross 704 cultivar showed better adaptability to drought stress and nitrogen deficiency.
JOURNAL OF PLANT NUTRITION
(2024)
Article
Plant Sciences
Ibrahim Erdal, Hakan Aktas, Cennet Yaylaci, Sevkiye Armagan Turkan, Gulnur Aydin, Yunus Hor
Summary: The study examined the effects of growth media made of peat and different domestic materials on tomato nutrition, growth, and yield as an alternative to cocopeat in Turkiye. It was found that using vermicompost and its mixtures with peat as growth media resulted in the highest leaf and fruit nutrient concentrations. The highest fruit yields and biomass weights were obtained with solely peat and 1:1 peat + vermicompost medium. Peat-containing growth media, especially peat + vermicompost mixtures, can be used as alternatives to cocopeat in soilless tomato cultivation.
JOURNAL OF PLANT NUTRITION
(2024)
Article
Plant Sciences
Kiron Bhakat, Ekramul Islam, Samir Kumar Mukherjee
Summary: This study investigated the effectiveness of bacterially solubilized zinc (BSZn) on the early growth of rice plants and the concentration of zinc in the plant parts. The results showed that BSZn can promote seed germination and seedling growth, increase chlorophyll and carotenoid content, and enhance zinc accumulation in the roots of rice seedlings.
JOURNAL OF PLANT NUTRITION
(2024)
