Treesearch
Displaying 5,021 - 5,030 of 64,690 Publications- •Tree size shapes forest carbon dynamics and determines how trees interact with their environment, including a changing climate. Here, we conduct the first global analysis of among-site differences in how aboveground biomass stocks and fluxes are distributed with tree size. •We analyzed repeat tree censuses from 25 large-scale (4–52 ha) forest plots spanning a broad climatic range over five continents to characterize how aboveground biomass, woody productivity, and woody mortality vary with tree diameter. We examined how the median, dispersion, and skewness of these size-related distributio...AuthorsCamille Piponiot, Kristina J. Anderson‐Teixeira, Stuart J. Davies, David Allen, Norman A. Bourg, David F. R. P. Burslem, Dairon Cárdenas, Chia‐Hao Chang‐Yang, George Chuyong, Susan Cordell, Handanakere Shivaramaiah Dattaraja, Álvaro Duque, Sisira Ediriweera, Corneille Ewango, Zacky Ezedin, Jonah Filip, Christian P. Giardina, Robert Howe, Chang‐Fu Hsieh, Stephen P. Hubbell, Faith M. Inman‐Narahari, Akira Itoh, David Janík, David Kenfack, Kamil Král, James A. Lutz, Jean‐Remy Makana, Sean M. McMahon, William McShea, Xiangcheng Mi, Mohizah Bt. Mohamad, Vojtěch Novotný, Michael J. O'Brien, Rebecca Ostertag, Geoffrey Parker, Rolando Pérez, Haibao Ren, Glen Reynolds, Mohamad Danial Md Sabri, Lawren Sack, Ankur Shringi, Sheng‐Hsin Su, Raman Sukumar, I‐Fang Sun, Hebbalalu S. Suresh, Duncan W. Thomas, Jill Thompson, Maria Uriarte, John Vandermeer, Yunquan Wang, Ian Ware, George D. Weiblen, Timothy J. S. Whitfeld, Amy Wolf, Tze Leong Yao, Mingjian Yu, Zuoqiang Yuan, Jess K. Zimmerman, Daniel Zuleta, Helene C. Muller‐LandauKeywordsSourceNew Phytologist. 234(5): 1664-1677Year2022
- Drought is a prominent feature of Hawaiʻi’s climate. However, it has been over 30 years since the last comprehensive meteorological drought analysis, and recent drying trends have emphasized the need to better understand drought dynamics and multi-sector effects in Hawaiʻi. Here, we provide a comprehensive synthesis of past drought effects in Hawaiʻi that we integrate with geospatial analysis of drought characteristics using a newly developed 100-year (1920–2019) gridded Standardized Precipitation Index (SPI) dataset. The synthesis examines past droughts classified into five categories:...AuthorsAbby G. Frazier, Christian P. Giardina, Thomas W. Giambelluca, Laura Brewington, Yi-Leng Chen, Pao-Shin Chu, Lucas Berio Fortini, Danielle Hall, David A. Helweg, Victoria W. Keener, Ryan J. Longman, Matthew P. Lucas, Alan Mair, Delwyn S. Oki, Julian J. Reyes, Stephanie Yelenik, Clay TrauernichtKeywordsSourceSustainability. 14(19): 12023Year2022
- A growth-and-yield model system applicable for the relatively greater growth rates of more recently planted longleaf pine (Pinus palustris Mill.) is needed. The present analysis uses mixed-effects models of other pines fit using measurements across a more complete range of stand development stages to predict the future development of contemporary longleaf pine plantations. This approach could be useful when there are insufficient measurement ages across a rotation for newer silvicultural treatments. Testing data were obtained of container-planted longleaf pine in central Louisiana....AuthorsCurtis L. VanderSchaafSourceIn: Willis, John L.; Self, Andrew B.; Siegert, Courtney M., eds. Proceedings of the 21st Biennial Southern Silvicultural Research Conference. Gen. Tech. Rep. SRS-268. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station: pp.115–122.Year2022
- During one of the warmest and driest droughts of the last century, the southern Appalachian Mountains experienced a regional outbreak of over a dozen large wildfires in late fall of 2016. We provide a synthesis of long-term forest changes leading up to the 2016 wildfires, examine the climatic setting and patterns of burn severity in relationship to topography, and discuss the ecological and management implications of these and future fires. During the pre- and post-European settlement periods, frequent low- and mixed-severity wildfires interacted with complex topographic gradients and...AuthorsMatthew Reilly, Steve P. Norman, Joseph J. O'Brien, E. Louise LoudermilkKeywordswildfire, southern Appalachians, Quercus, oak, Pinus, pine, eastern US, Nantahala National Forest, North Carolina, Chattahoochee National Forest, Georgia, Rock Mountain Fire, Chimney Tops 2 Fire, Rough Ridge Fire, Cohutta Wilderness, Great Smoky Mountains National Park, Tennessee, Gatlinburg, Tellico Fire, Pisgah National Forest, mesophication, drought, 2016 fire season, forest fires, fire severity, topography, landscape diversitySourceForest Ecology and ManagementYear2022
- Reference sites with relatively unaltered plant communities are used regularly to establish targets for ecological restoration, yet few are free from anthropogenic disturbances. In this study, we sought to understand the capacity for native community indicators and other plant species to recover from abandoned woods roads and tilled soils within reference sites. We mapped disturbances in a 34 ha portion of the Wade Tract, an old-growth longleaf pine-wiregrass (Pinus palustris-Aristida stricta) woodland using GPS and LiDAR and counted stems of 25 native species (20 woody and 5 herbaceous)...AuthorsR. Todd Engstrom, J. Kevin Hiers, Kevin M. Robertson, J. Morgan Varner, James Cox, Joseph J. O'Brien, Scott PokswinskiSourceNatural Areas JournalYear2022
- This is the fourth in a series of periodic monitoring reports on the status and trends of late-successional and old-growth (LSOG) forests since the implementation of the Northwest Forest Plan (NWFP) in 1994. The objective of this monitoring is to evaluate the success of the plan in reaching its desired amount and distribution of LSOG forest on federal lands within the range of the northern spotted owl (Strix occidentalis caurina) in the United States. We began our assessment in the years shortly preceding the NWFP, but primarily focused on how LSOG forests have changed as a result of...AuthorsRaymond J. Davis, David M. Bell, Matthew J. Gregory, Zhiqiang Yang, Andrew Gray, Sean P. Healey, Andrew E. StrattonKeywordsNorthwest Forest Plan, effectiveness monitoring, late-successional and old-growth forests, old-growth structure index, Gradient Nearest Neighbor imputation, GNN, Landscape Change and Monitoring System, LCMS, Forest Service, Bureau of Land Management, late-successional reserves, physiographic provincesSourceGen. Tech. Rep. PNW-GTR-1004. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 82 p.Year2022
- Insect herbivores play important roles in shaping many ecosystem processes, but how climate change will alter the effects of insect herbivory are poorly understood. To address this knowledge gap, we quantified for the first time how insect frass and cadavers affected leaf litter decomposition rates and nutrient release along a highly constrained 4.3°C mean annual temperature (MAT) gradient in a Hawaiian montane tropical wet forest. We constructed litterbags of standardized locally sourced leaf litter, with some amended with insect frass + cadavers to produce treatments designed to simulate...AuthorsBernice Hwang, Christian P. Giardina, Creighton M. Litton, Kainana S. Francisco, Cody Pacheco, Naneaikealaula Thomas, Tyler Uehara, Daniel B. MetcalfeKeywordsSourceEcology and Evolution. 12(9): 1225.Year2022
- Pantropical variation in soils of the tropical dry forest (TDF) biome is enormously high but has been poorly characterized. To quantify variation in the global distribution of TDF soil physical and chemical properties in relation to climate and geology, we produced a synthesis using 7500 points of data with gridded fields representing lithologic, edaphic, and climatic characteristics. Our analyses reveal that 75 TDF ecoregions across five biogeographic domains (Afrotropical, Australasian, Indo-Malayan, Neotropical, and Oceanian) varied strongly with respect to parent material: sediment...AuthorsAnaitzi Rivero-Villar, Marinés de la Peña-Domene, Gerardo Rodríguez-Tapia, Christian P. Giardina, Julio CampoKeywordsSourceSustainability. 14(11): 6803Year2022
- AuthorsThu Ya Kyaw, Courtney M. Siegert, Heidi J. Renninger, Randall J. RousseauSourceIn: Willis, John L.; Self, Andrew B.; Siegert, Courtney M., eds. Proceedings of the 21st Biennial Southern Silvicultural Research Conference. Gen. Tech. Rep. SRS-268. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station: pp.109–113.Year2022
- AuthorsKelsey Bakken, Steven McNulty, Michael Gavazzi, Eva Paradiso, Elijah WorleySourceIn: Willis, John L.; Self, Andrew B.; Siegert, Courtney M., eds. Proceedings of the 21st Biennial Southern Silvicultural Research Conference. Gen. Tech. Rep. SRS-268. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station pp.: 92–94.Year2022