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
Biochemical Research Methods
Ben G. Weinstein, Sarah J. Graves, Sergio Marconi, Aditya Singh, Alina Zare, Dylan Stewart, Stephanie A. Bohlman, Ethan P. White
Summary: The study established a benchmark dataset to evaluate crown detection and delineation methods for canopy trees in dominant forest types in the United States, consisting of thousands of image-annotated crowns and field-annotated crowns, as well as training crowns. Standardizing evaluation metrics helped streamline comparisons between different methods.
PLOS COMPUTATIONAL BIOLOGY
(2021)
Article
Forestry
Houjuan Song, Duoduo Zhou, Song Chen, Jing Li, Chenlin Wang, Yuchen Ren, Xiuqing Yang
Summary: This study investigated tree mortality in forests with different climates and found that tree size was the most important factor affecting tree mortality. The interactions between neighbors and abiotic factors such as convexity and soil nutrients also had significant effects. These findings have important implications for forest dynamics and management.
FOREST ECOLOGY AND MANAGEMENT
(2023)
Article
Biodiversity Conservation
Samuel P. Reed, Alejandro A. Royo, Alexander T. Fotis, Kathleen S. Knight, Charles E. Flower, Peter S. Curtis
Summary: High browsing pressure from white-tailed deer during stand initiation can have a long-term impact on stand and canopy structure, leading to lower species diversity and tree density, resulting in taller and less dense canopies. Considering the legacy of ungulate herbivory on canopy structure may inform both land management and our understanding of ecological function.
JOURNAL OF APPLIED ECOLOGY
(2022)
Article
Forestry
Xingtao Hu, Huaiqing Zhang, Guangbin Yang, Hanqing Qiu, Kexin Lei, Tingdong Yang, Yang Liu, Yuanqing Zuo, Jiansen Wang, Zeyu Cui
Summary: This study used a comprehensive grade model of spatial structure (CGMSS) to evaluate the individual tree growth states of Chinese fir and developed a morphological structure growth model based on CGMSS to simulate the growth variations of the forest stands. The results showed that the CGMSS-based model had a higher prediction accuracy compared to the spatial structural unit (SSU)-based model. The main conclusion of this study is that the CGMSS model can accurately simulate the differential growth of trees in different growth dominance degrees and spatial structure states in forest stands, making visualized forest management more effective and realistic.
Article
Forestry
Pekka Kaitaniemi, Anna Lintunen
Summary: This study explored a simple tree height- and distance-based competition index to predict structural tree attributes in three boreal tree species growing in low to moderate densities within mixed stands. The results suggest that quantifying competitive interactions based on individual tree heights and locations has the potential to improve the prediction of tree attributes, although outcomes may vary by species.
Article
Plant Sciences
Tanvir Ahmed Shovon, Stephanie Kang, Michael Scherer-Lorenzen, Charles A. Nock
Summary: This article investigates the relationship between plant diversity and productivity in forests and suggests that diversity at the neighborhood scale and higher planting density are important factors in promoting a positive diversity-productivity relationship.
JOURNAL OF ECOLOGY
(2022)
Article
Environmental Sciences
Jing Cao, Hongyan Liu, Bo Zhao, Zongshan Li, Boyi Liang, Liang Shi, Lu Wu, Elizabeth L. Cressey, Timothy A. Quine
Summary: The study demonstrates that climate warming and forest stand density have significant impacts on tree growth. High forest density could exacerbate the negative effects of warming-induced drought on tree growth, especially pronounced in conifer trees.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Matthieu Deluzet, Thierry Erudel, Xavier Briottet, David Sheeren, Sophie Fabre
Summary: The ITC delineation method based on the multi-criteria graph (MCG-Tree) combines geometric and spectral information to address the challenging task of individual tree crown delineation in temperate forests. This method improves delineation performance by up to 25% compared to a state-of-the-art watershed segmentation approach, with promising results for mixed forests.
Article
Plant Sciences
Simone M. Reis, Beatriz S. Marimon, Adriane Esquivel-Muelbert, Ben Hur Marimon, Paulo S. Morandi, Fernando Elias, Edmar A. de Oliveira, David Galbraith, Ted R. Feldpausch, Imma O. Menor, Yadvinder Malhi, Oliver L. Phillips
Summary: Tree death is a crucial process for understanding forest response to global change. The forests in the southern edge of the Amazon offer insights into the future of the larger region. The causes of tree death in this area are mainly wind and water deficit-driven disturbances, which could have significant implications for the forests' resilience to increased seasonality.
JOURNAL OF ECOLOGY
(2022)
Article
Plant Sciences
Anne Bienert, Louis Georgi, Matthias Kunz, Goddert von Oheimb, Hans-Gerd Maas
Summary: Mobile laser scanning (MLS) is a valuable technique for automated tree segmentation and parameter determination in forest research. The detection rate of trees in MLS data strongly depends on the distance to the travelled track, with trees being almost completely segmented up to a distance of about 30 m from the trajectory. The accuracy of tree parameters derived from MLS-segmented trees is similar to those from TLS-segmented trees.
Article
Plant Sciences
Travis G. Britton, Timothy J. Brodribb, Shane A. Richards, Chantelle Ridley, Mark J. Hovenden
Summary: Individual tree physiology and the composition, physiology, and density of surrounding stands influence natural drought-induced damage in forest communities. The vulnerability to xylem cavitation and patterns of drought damage are influenced by both individual plant characteristics and community dynamics.
Article
Environmental Sciences
Flora Tinya, Bence Kovacs, Andras Bidlo, Balint Dima, Ildiko Kiraly, Gergely Kutszegi, Ferenc Lakatos, Zsuzsa Mag, Sara Marialigeti, Juri Nascimbene, Ferenc Samu, Iren Siller, Gyozo Szel, Peter Odor
Summary: The study explores the environmental drivers affecting multi-taxon biodiversity in forests, revealing the importance of factors such as tree species diversity, stand structure, and microclimate. Different environmental variables have varying influences on different organism groups, with higher tree species diversity contributing to increased overall species richness.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Pavel Fibich, Bryan A. Black, Jiri Dolezal, Grant L. Harley, Justin T. Maxwell, Jan Altman
Summary: The impact of increasing tropical cyclone (TC) activity on temperate forests in the eastern United States was investigated through the use of structural equation models. High TC activity was found to lead to a decrease in the size of trees, an increase in tree density and basal area, and a decline in tree species richness. TC activity was identified as the strongest predictor of forest structure and species richness in dry forests, while its impact on wet forests was weaker. These results highlight the sensitivity of temperate forests to future increases in TC activity and the potential decline in tree species richness.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Biodiversity Conservation
Emiel De Lombaerde, Lander Baeten, Kris Verheyen, Michael P. Perring, Shiyu Ma, Dries Landuyt
Summary: The study synthesized data from 32 experimental studies to investigate the effects of understorey removal on tree regeneration in temperate forests. It found that in most cases, removing understorey vegetation can have positive effects on seedling survival and growth, with different tree species and forest conditions impacting the results.
JOURNAL OF APPLIED ECOLOGY
(2021)
Article
Soil Science
K. A. Vajari
EURASIAN SOIL SCIENCE
(2015)
Article
Ecology
Behzad Bakhshandeh Navroud, Kambiz Abrari Vajari, Babak Pilehvar, Yahyah Kooch
RUSSIAN JOURNAL OF ECOLOGY
(2015)
Article
Environmental Sciences
Behzad Bakhshandeh-Navroud, Kambiz Abrari Vajari, Babak Pilehvar, Yahya Kooch
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2018)
Article
Environmental Sciences
Kambiz Abrari Vajari
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2018)
Article
Forestry
Hafizollah Shahriari, Kambiz Abrari Vajari, Babak Pilehvar, Mehdi Heydari
JOURNAL OF FORESTRY RESEARCH
(2020)
Article
Forestry
Alireza Amolikondori, Kambiz Abrari Vajari, Mohammad Feizian, Antonino Di Iorio
IFOREST-BIOGEOSCIENCES AND FORESTRY
(2020)
Article
Forestry
Mojtaba Azaryan, Kambiz Abrari Vajari, Beitollah Amanzadeh
Summary: Understanding variations in soil humus and fine root properties in Oriental beech stand in response to development stages is essential for sustainable forest management. Significant differences were found in humus element concentrations and fine root chemical properties among different development stages. Different development stages also had significant impacts on fine root biomass and morphology traits in beech trees. Our results highlight the important role that development stages play in Beech forest dynamics.
EUROPEAN JOURNAL OF FOREST RESEARCH
(2021)
Article
Forestry
Alireza Amoli Kondori, Kambiz Abrari Vajari, Mohammad Feizian, Antonio Montagnoli, Antonino Di Iorio
Summary: Research shows that within six years after logging, differently sized harvest-created gaps have an impact on the dynamics and chemical composition of fine roots. Chemical traits of fine roots significantly increased with increasing gap size, while biomass and morphological traits remained unaffected.
Article
Forestry
Hamzeh Jafari Sarabi, Babak Pilehvar, Kambiz Abrari Vajari, Seyed Mohammad Waez-Mousavi
Summary: This study examined the effects of changes in plant diversity and species composition on litter decomposition, indicating that lignin content is the best predictor of the overall decomposition rate. In contrast to other ecosystems, a majority of the effects observed were additive rather than non-additive.
EUROPEAN JOURNAL OF FOREST RESEARCH
(2021)
Article
Agronomy
Alireza Annolikondori, Kambiz Abrari Vajari, Mohammad Feizian
Summary: This study investigated the changes in soil organic carbon (SOC), total nitrogen (N) and phosphorus (P) stocks under different gap sizes in the Hechuan oriental beech forest. The results showed that gap size had a significant impact on the stocks of soil carbon, nitrogen and phosphorus, with higher values observed in larger gaps. There was no significant difference in soil carbon, nitrogen and phosphorus stocks between gaps and adjacent closed stands. In gaps, the stocks of SOC and P were positively related to soil microbial carbon and microbial phosphorus, respectively.
JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE
(2022)
Article
Ecology
Mojtaba Azaryan, Kambiz Abrari Vajari, Beitollah Amanzadeh
Summary: Soil particle-size fractions have a significant influence on soil physico-chemical properties, microbial biomass, and fine roots traits. The study found that clay content is positively correlated with carbon, carbon/nitrogen ratio, and moisture, but negatively correlated with nitrogen and phosphorous. Similarly, silt values have a positive correlation with carbon/nitrogen ratio, but a negative correlation with nitrogen and phosphorous. The results also show that clay and sand contents are positively correlated with fine root density, biomass, length, and surface area, while sand content is negatively correlated with fine root volume.
ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY
(2022)
Article
Biology
Mojtaba Azaryan, Kambiz Abrari Vajari, Beitollah Amanzadeh
Summary: This research investigated the diversity of herbaceous layer and morphological traits of oriental beech trees in different development stages. The results showed significant differences among stages, with the decay stage exhibiting the highest richness and diversity indices, and the optimal stage having the highest evenness index.
Article
Biodiversity Conservation
Z. Mirazadi, B. Pilehvar, K. Abrari Vajari
BIODIVERSITY AND CONSERVATION
(2017)