Treesearch
Search National Treesearch
Displaying 491 - 500 of 7,082 Publications
- The Rothermel fire spread model provides the scientific basis for the US National Fire Danger Rating System (NFDRS) and several other important fire management applications. This study proposes a new perspective of the model that partitions the reaction intensity function and Energy Release Component (ERC) equations as an alternative that simplifies calculations while providing more insight into the temporal variability of the energy release component of fire danger. We compare the theoretical maximum reaction intensities and corresponding ERCs across 1978, 1988 and 2016 NFDRS fuel models...AuthorsFrancis M. Fujioka, David R. Weise, Shyh-Chin Chen, Seung Hee Kim, Menas C. KafatosKeywordsSourceInternational Journal of Wildland Fire. 30(5): 351-364.Year2021
- Post-fire catchment and water utility managers throughout the world use predictive models to estimate potential erosion risks to aid in evaluating downstream impacts of increased runoff and erosion, and to target critical areas within a fire for applying mitigation practices. Erosion prediction can be complicated by forest road networks. Using novel GIS technology and soil erosion modelling, this study evaluated the effect of roads on surface runoff, erosion and sediment yields following a wildfire and determined that the predictive models were providing reasonable results. The GeoWEPP...AuthorsLongxi Cao, William J. Elliot, Jonathan W. LongKeywordsSourceHydrological Processes. 35(6): e14139Year2021
- Forests are integral to sustaining clean water resources and healthy watersheds. It is critical, therefore, that managers fully understand the potential impacts of their actions on myriad ecosystem services provided by forested watersheds. While forest hydrologists have long used paired-watershed experiments to elucidate the complex interactions between forest management and watershed biogeochemical and ecohydrological processes, there is still much to learn from these studies. Here, we present an overview of the process for designing a paired-watershed study using a large harvesting...AuthorsSalli Dymond, Paul Richardson, Lynn A. Webb, Elizabeth Keppeler, Ivan Arismendi, Kevin D. Bladon, Peter H. Cafferata, Helen E. Dahlke, David L. Longstreth, Patrick K. Brand, Peter R. Ode, Christopher G. Surfleet, Joseph WagenbrennerKeywordsSourceFrontiers in Forests and Global Change. 4: 691732Year2021
- Field monitoring of urban trees is essential to learning how urban forests change over time. Many arborists and urban forest managers worldwide seek to understand how their tree systems are faring in terms of growth, health, and mortality. How successful is an urban tree planting program with respect to mortality and survival? Has the tree species composition or total number of trees changed across a city or neighborhood? How much have the trees themselves grown? Long-term data collection can provide valuable information for urban forestry practitioners and researchers interested in these...AuthorsNatalie S. van Doorn, Lara RomanSourceArborist News. 30(3): 46-51.Year2021
- Arbuscular mycorrhizal (AM) and ectomycorrhizal (EcM) associations are critical for host-tree performance. However, how mycorrhizal associations correlate with the latitudinal tree beta-diversity remains untested. Using a global dataset of 45 forest plots representing 2,804,270 trees across 3840 species, we test how AM and EcM trees contribute to total beta-diversity and its components (turnover and nestedness) of all trees. We find AM rather than EcM trees predominantly contribute to decreasing total beta-diversity and turnover and increasing nestedness with increasing latitude, probably...AuthorsYonglin Zhong, Chengjin Chu, Jonathan A. Myers, Gregory S. Gilbert, James A. Lutz, Jonas Stillhard, Kai Zhu, Jill Thompson, Jennifer L. Baltzer, Fangliang He, Joseph A. LaManna, Stuart J. Davies, Kristina J. Aderson-Teixeira, David F.R.P. Burslem, Alfonso Alonso, Kuo-Jung Chao, Xugao Wang, Lianming Gao, David A. Orwig, Xue Yin, Xinghua Sui, Zhiyao Su, Iveren Abiem, Pulchérie Bissiengou, Norm Bourg, Nathalie Butt, Min Cao, Chia-Hao Chang-Yang, Wei-Chun Chao, Hazel Chapman, Yu-Yun Chen, David A. Coomes, Susan Cordell, Alexandre A. de Oliveira, Hu Du, Suqin Fang, Christian P. Giardina, Zhanqing Hao, Andrew Hector, Stephen P. Hubbell, David Janík, Patrick A. Jansen, Mingxi Jiang, Guangze Jin, David Kenfack, Kamil Král, Andrew J. Larson, Buhang Li, Xiankun Li, Yide Li, Juyu Lian, Luxiang Lin, Feng Liu, Yankun Liu, Yu Liu, Fuchen Luan, Yahuang Luo, Keping Ma, Yadvinder Malhi, Sean M. McMahon, William McShea, Hervé Memiaghe, Xiangcheng Mi, Mike Morecroft, Vojtech Novotny, Michael J. O’Brien, Jan den Ouden, Geoffrey G. Parker, Xiujuan Qiao, Haibao Ren, Glen Reynolds, Pavel Samonil, Weiguo Sang, Guochun Shen, Zhiqiang Shen, Guo-Zhang Michael Song, I-Fang Sun, Hui Tang, Songyan Tian, Amanda L. Uowolo, María Uriarte, Bin Wang, Xihua Wang, Youshi Wang, George D. Weiblen, Zhihong Wu, Nianxun Xi, Wusheng Xiang, Han Xu, Kun Xu, Wanhui Ye, Mingjian Yu, Fuping Zeng, Minhua Zhang, Yingming Zhang, Jess K. Zimmerman, Li ZhuSourceNature Communications. 12(1): 3137Year2021
- 1. Tree-species mixture effects (e.g. complementarity and facilitation) have been found to increase individual-tree productivity, lessen mortality and improve recruitment in forests worldwide. By promoting more efficient and complete resource use, mixture effects may also lessen individual-tree-level water stress, thus improving drought resistance. We investigated the influence of mixture effects on tree productivity, mortality and recruitment across broad compositional and moisture gradients in high-elevation Interior West US mixed-conifer communities, where Populus tremuloides(trembling...AuthorsChristopher Looney, Wilfred J. Previant, John B. Bradford, Linda M. NagelKeywordsSourceJournal of Ecology. 109(8): 2934-2949Year2021
- Soil microbiomes are rapidly becoming known as an important driver of plant phenotypic variation and may mediate plant responses to environmental factors. However, integrating spatial scales relevant to climate change with plant intraspecific genetic variation and soil microbial ecology is difficult, making studies of broad inference rare. Here we hypothesize and show: 1) the degree to which tree genotypes condition their soil microbiomes varies by population across the geographic distribution of a widespread riparian tree, Populus angustifolia; 2) geographic dissimilarity in soil microbiom...AuthorsIan Ware, Michael E. Van Nuland, Zamin K. Yang, Christopher W. Schadt, Jennifer A. Schweitzer, Joseph K. BaileySourceCommunications Biology. 4(1): 748Year2021
- The walnut twig beetle, Pityophthorus juglandisBlackman, the vector of thousand cankers disease (TCD), poses a significant threat to North American walnut (Juglandaceae Juglans) trees. Despite discovery of TCD-related tree mortality over a decade ago, management options are lacking. This study represents the culmination of several years of investigating the chemical ecology of P. juglandisin hopes of developing a semiochemical repellent to disrupt the beetle’s host colonization and aggregation behaviors. Numbers of P. juglandislanding on semiochemical-treated Juglans regiaL. trees in a...AuthorsJackson Audley, Richard Bostock, Steven J. SeyboldKeywordsSourceJournal of Economic Entomology. 114(3): 1180-1188.Year2021
- Introduced mammalian predators are responsible for the decline and extinction of many native species, with rats (genus Rattus) being among the most widespread and damaging invaders worldwide. In a naturally fragmented landscape, we demonstrate the multi-year effectiveness of snap traps in the removal of Rattus rattus and Rattus exulans from lava-surrounded forest fragments ranging in size from <0.1 to >10 ha. Relative to other studies, we observed low levels of fragment recolonization. Larger rats were the first to be trapped, with the average size of trapped rats decreasing over time. Rat...AuthorsSarah Barney, Devin Leopold, Kainana S. Francisco, David Flaspohler, Tadashi Fukami, Christian P. Giardina, Daniel Gruner, Jessie Knowlton, William Pitt, Erin E. Wilson RankinSourceEnvironmental Conservation. Environmental Conservation. 30: 1-8.Year2021
- Tropical forests exert a disproportionately large influence on terrestrial carbon (C) balance but projecting the effects of climate change on C cycling in tropical forests remains uncertain. Reducing this uncertainty requires improved quantification of the independent and interactive effects of variable and changing temperature and precipitation regimes on C inputs to, cycling within and loss from tropical forests. Here, we quantified aboveground litterfall and soil-surface CO2efflux (“soil respiration”; FS) in nine plots organized across a highly constrained 5.2°C mean annual temperature...AuthorsMaokui Lyu, Christian P. Giardina, Creighton M. LittonSourceGlobal Change Biology. 27(16): 3824-3836Year2021