Treesearch
Displaying 1,841 - 1,850 of 64,753 Publications- Minimum stand densities necessary to achieve crown closure is an important aspect of stocking assessment that merits more attention. Managers concerned with optimizing individual-tree and stand-level responses will benefit from improved guidance on minimum densities when designing intermediate silvicultural treatments. To do so we generated a dataset of crown projection areas using previously published crown width models and considered various assumptions about crown packing and the spatial arrangement of stems. Implied stem densities based on predicted crown sizes were used to determine...AuthorsDavid Ray, Robert Seymour, Shawn Fraver, John-Pascal Berrill, Laura S. Kenefic, Nicole Rogers, Aaron WeiskittelKeywordsSourceForest Ecology and ManagementYear2024
- Peatlands are abundant across the boreal‐Arctic landscape and are important sources of methane, a powerful greenhouse gas. The amount of methane emitted into the atmosphere depends on multiple factors including the organic material being decomposed and the microbial processes (“pathways”) that produce methane. The different pathways of methane production leave distinct fingerprints (“stable carbon isotopes”) on methane that provide information on how that methane was formed and help to trace methane in the atmosphere back to its ground source. We looked at how stable carbon isotopes change...AuthorsMcKenzie A. Kuhn, Ruth K. Varner, Carmody K. McCalley, Clarice R. Perryman, Mika Aurela, Sophia A. Burke, Jeffrey P. Chanton, Patrick M. Crill, Jessica DelGreco, Jia Deng, Liam Heffernan, Christina Herrick, Suzanne B. Hodgkins, Cheristy P. Jones, Sari Juutinen, Evan Kane, Louis J. Lamit, Tuula Larmola, Erik Lilleskov, David Olefeldt, Michael W. Palace, Virginia I Rich, Christopher Schulze, Joanne H. Shorter, Franklin B. Sullivan, Oliver Sonnentag, Merritt R. Turetsky, Mark P. WaldropKeywordsSourceJournal of Geophysical Research: BiogeosciencesYear2024
- Urban forest inventories are conducted to obtain important information regarding trees and the ecosystem services they provide in the urban environment. This information is derived from a sample of ground plots within which all trees are measured. It is common that some of the selected sample plots are unable to be measured, primarily due to lack of permission to access privately owned lands. At a minimum, nonresponse results in decreased sample sizes and eroded confidence in information derived from the inventory. Further, concern is raised regarding sample bias and its associated effects...AuthorsJim Westfall, Christopher B. Edgar, Rebekah ZehnderKeywordsSourceUrban EcosystemsYear2024
- Given global urbanization trends, where approximately 68% of the global population will reside in cities by 2050 (estimates by United Nations, 2018), the most common direct human experience of forests will occur in cities. Urban landcover is expected to increase by 40% in the coming decades (Chen et al., 2020), and as such, urbanization is a global driver of change to forest ecosystems outside of cities. Between 1990 and 2020, the area of land occupied by trees in urban settings increased by 7.45 million hectares (as reported by 36 countries, Food and Agriculture Organization [FAO], 2020)....AuthorsRichard Hallett, Max R. R. Piana, Michelle Johnson, Leslie BrandtKeywordsSourceFuture Forests: Mitigation and Adaptation to Climate ChangeYear2024
- Extreme wildfire is an increasing threat to lives, property, and ecosystems across the United States and many parts of the world. Family forest owners (FFOs) own a large percentage of forestland in the United States, and actions and behaviors on their forestland have a large impact on wildfire prevention and mitigation across the landscape. Using data from the USDA Forest Service’s 2018 National Woodland Owner Survey, we investigated national and regional FFO wildfire attitudes and behaviors. We see that concern for wildfire is relatively high across the United States; however, this...AuthorsSarah Butler, Brett J. Butler, Emma M. SassSourceForest ScienceYear2024
- Wildfires have emerged as one of the most destructive natural disasters worldwide, causing catastrophic losses. These losses have underscored the urgent need to improve public knowledge and advance existing techniques in wildfire management. Recently, the use of Artificial Intelligence (AI) in wildfires, propelled by the integration of Unmanned Aerial Vehicles (UAVs) and deep learning models, has created an unprecedented momentum to implement and develop more effective wildfire management. Although existing survey papers have explored learning-based approaches in wildfire, drone use in...AuthorsSayed Pedram Haeri Boroujeni, Abolfazl Razi, Sahand Khoshdel, Fatemeh Afghah, Janice L. Coen, Leo O’Neill, Peter Fule, Adam Watts, Nick-Marios T. Kokolakis, Kyriakos G. VamvoudakisKeywordsSourceInformation Fusion. 108(4): 102369.Year2024
- Understanding the genetic basis of how plants defend against pathogens is important to monitor and maintain resilient tree populations. Swiss needle cast (SNC) and Rhabdocline needle cast (RNC) epidemics are responsible for major damage of forest ecosystems in North America. Here we investigate the genetic architecture of tolerance and resistance to needle cast diseases in Douglas-fir (Pseudotsuga menziesii) caused by two fungal pathogens: SNC caused by Nothophaeocryptopus gaeumannii, and RNC caused by Rhabdocline pseudotsugae. We performed case–control genome-wide association analyses and...AuthorsPooja Singh, Brad St. Clair, Brandon M. Lind, Richard Cronn, Nicholas P. Wilhelmi, Nicolas Feau, Mengmeng Lu, Dragana Obreht Vidakovic, Richard C. Hamelin, David C. Shaw, Sally N. Aitken, Sam YeamanKeywordsSourceNew Phytologist. 243(2): 705-719.Year2024
- Forests are recognized for sustaining good water chemistry within landscapes. This study focuses on the water chemistry parameters and their hydrological predictability and seasonality (as a component of predictability) in watersheds of varying scales, with and without human (forest management) activities on them, using Colwell indicators for data collected during 2011-2019. The research was conducted in three forested watersheds located at the US Forest Service Santee Experimental Forest in South Carolina USA. The analysis revealed statistically significant (α = 0.05) differences between...AuthorsAndrzej Wałęga, Devendra M. Amatya, Carl C. Trettin, Timothy Callahan, Dariusz Młyński, Vijay VulavaKeywordsSourceSustainabilityYear2024
- Objective: In the U.S. Pacific Northwest, climate change is increasing air temperatures, decreasing warm season (April-September) streamflow, and increasing cool season (October-March) streamflow. Warmer water temperatures may alter conditions for migratory coldwater fishes like the Bull Trout Salvelinus confluentus. Consequently, an understanding of Bull Trout migration and survival is critical for species conservation and restoration. In the Salmon River basin, Idaho, 1992 and 1993 transpired to be two of the most opposing extreme years among the past three decades for warm season water...AuthorsPatti J. Wohner, Russ F. Thurow, James T. PetersonKeywordsSourceTransactions of the American Fisheries Society. 153: 326-346.Year2024
- Snow leopards (Panthera uncia) inhabit the mountainous regions of High Asia, which experienced serial glacial contraction and expansion during climatic cycles of the Pleistocene. The corresponding impacts of glacial vicariance may have alternately promoted or constrained genetic differentiation to shape the distribution of genetic lineages and population structure. We studied snow leopard phylogeography across High Asia by examining range-wide historical and contemporary genetic structure with mitochondrial DNA and microsatellite markers. We genotyped 182 individuals from across snow...AuthorsImogene A. Cancellare, Byron Weckworth, Anthony Caragiulo, Kristine L. Pilgrim, Thomas M. McCarthy, Alisher Abdullaev, George Amato, Xiaoxing Bian, Elena Bykova, Isabela Dias-Freedman, Mariya Gritsina, Lauren M. Hennelly, Safia Janjua, Orjan Johansson, Shannon Kachel, Alexander Karnaukhov, Miroslav Korablev, Zairbek Kubanychbekov, Rahim Kulenbekov, Xuchang Liang, Purevjav Lkhagvajav, Tara K. Meyer, Bariushaa Munkhtsog, Bayaraa Munkhtsog, Muhammad A. Nawaz, Stephane Ostrowski, Mikhail Paltsyn, Andrey Poyarkov, Salisa Rabinowitz, Thomas Rooney, Tatjana Rosen, Viatcheslav V Rozhnov, Benjamin N. Sacks, Michael K. Schwartz, Kyle P. McCarthyKeywordsSourceBiodiversity and Conservation. 33: 3961-3979.Year2024