Treesearch
Displaying 16,101 - 16,110 of 65,196 Publications- AuthorsSandra Metslaid, John A. Stanturf, Maris Hordo, Henn Korjus, Diana Laarmann, Andres KivisteKeywordsSourceEnvironmental Science and Pollution ResearchYear2016
- Wildland fire radiant energy emission is one of the only measurements of combustion that can be made at high temporal and spatial resolutions. Furthermore, spatially and temporally explicit measurements are critical for making inferences about ecological fire effects. Although the correlation between fire frequency and plant biological diversity in frequently burned coniferous forests is well documented, the ecological mechanisms explaining this relationship remains elusive. Uncovering these mechanisms will require highly resolved, spatially explicit fire data (Loudermilk et al. 2012)....AuthorsJoseph J. O'Brien, E. Louise Loudermilk, J. Kevin Hiers, Scott Pokswinski, Benjamin Hornsby, Andrew T. Hudak, Dexter Strother, Eric Rowell, Benjamin C. BrightKeywordsSourceCanadian Journal of Remote Sensing. 42(5): 489-500.Year2016
- An understanding of the impacts of exotic plant species on ecosystems is necessary to justify and guide efforts to limit their spread, restore natives, and plan for conservation. Invasive annual grasses such as Bromus tectorum, B. rubens, B. hordeaceus, and B. diandrus (hereafter collectively referred to as Bromus) transform the structure and function of ecosystems they dominate. Experiments that prove cause-and-effect impacts of Bromus are rare, yet inferences can be gleaned from the combination of Bromus-ecosystem associations, ecosystem condition before/after invasion, and an understandi...AuthorsMatthew J. Germino, Jayne Belnap, John M. Stark, Edith B Allen, Benjamin RauKeywordsSourceIn: M.J. Germino et al. (eds.), Exotic Brome-Grasses in Arid and Semiarid Ecosystems of the Western US, Springer Series on Environmental Management,Year2016
- The seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem. Based on a unique combination of seasonal pan-tropical data sets from 89 experimental sites (68 include aboveground wood productivity measurements and 35 litter productivity measurements), their associated canopy photosynthetic capacity (enhanced vegetation index, EVI) and climate, we ask how carbon assimilation and aboveground allocation are related to climate seasonality in tropical forests...AuthorsFabien H. Wagner, Bruno Herault, Damien Bonal, Clement Stahl, Liana O. Anderson, Timothy R. Baker, Gabriel Sebastian Becker, Hans Beeckman, Danilo Boanerges Souza, Paulo Cesar Botosso, David M. J. S. Bowman, Achim Brauning, Benjamin Brede, Foster Irving Brown, Jesus Julio Camarero, Plinio Barbosa Camargo, Fernanda C. G. Cardoso, Fabricio Alvim Carvalho, Wendeson Castro, Rubens Koloski Chagas, Jerome Chave, Emmanuel N. Chidumayo, Deborah A. Clark, Flavia Regina Capellotto Costa, Camille Couralet, Paulo Henrique da Silva Mauricio, Helmut Dalitz, Vinicius Resende de Castro, Jacanan Eloisa de Freitas Milani, Edilson Consuelo de Oliveira, Luciano de Souza Arruda, Jean-Louis Devineau, David M. Drew, Oliver Dunisch, Giselda Durigan, Elisha Elifuraha, Marcio Fedele, Ligia Ferreira Fedele, Afonso Figueiredo Filho, Cesar Augusto Guimaraes Finger, Augusto Cesar Franco, Joao Lima Freitas Junior, Franklin Galvao, Aster Gebrekirstos, Robert Gliniars, Paulo Mauricio Lima de Alencastro Graca, Anthony D. Griffiths, James Grogan, Kaiyu Guan, Jurgen Homeier, Maria Raquel Kanieski, Lip Khoon Kho, Jennifer Koenig, Sintia Valerio Kohler, Julia Krepkowski, Jose Pires Lemos-Filho, Diana Lieberman, Milton Eugene Lieberman, Claudio Sergio Lisi, Tomaz Longhi Santos, Jose Luis Lopez Ayala, Eduardo Eijji Maeda, Yadvinder Malhi, Vivian R. B. Maria, Marcia C. M. Marques, Renato Marques, Hector Maza Chamba, Lawrence Mbwambo, Karina Liana Lisboa Melgaco, Hooz Angela Mendivelso, Brett P. Murphy, Joseph J. O'Brien, Steven F. Oberbauer, Naoki Okada, Raphael Pelissier, Lynda D. Prior, Fidel Alejandro Roig, Michael Ross, Davi Rodrigo Rossatto, Vivien Rossi, Lucy Rowland, Ervan Rutishauser, Hellen Santana, Mark Schulze, Diogo Selhorst, Williamar Rodrigues Silva, Marcos Silveira, Susanne Spannl, Michael D. Swaine, Jose Julio Toledo, Marcos Miranda Toledo, Marisol Toledo, Takeshi Toma, Mario Tomazello Filho, Juan Ignacio Valdez Hernandez, Jan Verbesselt, Simone Aparecida Vieira, Gregoire Vincent, Carolina Volkmer de Castilho, Franziska Volland, Martin Worbes, Magda Lea Bolzan Zanon, Luiz E. O. C. AragaoSourceBiogeosciencesYear2016
- Sulfite pretreatment to overcome the recalcitrance of lignocelluloses (SPORL) promises to provide efficient bioconversion of woody biomass into bioethanol and lignin co-products. Results from several laboratory and pilot-scale studies are presented to demonstrate SPORL performance, with comparisons to competing technologies. Excellent ethanol yields of up to approximately 80% theoretical, based on glucan, mannan, and xylan content of wood, were achieved at titers over 40 g/L. This high productivity was accomplished using low cellulase loadings, 26 mL/kg wood, and without detoxification,...AuthorsJunyong Zhu, Chao Zhang, Roland L. Gleisner, Carl J. Houtman, Xuejun PanKeywordsSourceFPL-GTR-240Year2016
- Abiotic factors have a strong influence on where annual Bromus species are found. At the large regional scale, temperature and precipitation extremes determine the boundaries of Bromus occurrence. At the more local scale, soil characteristics and climate influence distribution, cover, and performance. In hot, dry, summer-rainfall-dominated deserts (Sonoran, Chihuahuan), little or no Bromus is found, likely due to timing or amount of soil moisture relative to Bromus phenology. In hot, winter-rainfall-dominated deserts (parts of the Mojave Desert), Bromus rubens is widespread and correlated...AuthorsJayne Belnap, John M. Stark, Benjamin Rau, Edith B. Allen, Susan PhillipsKeywordsSourceIn: M.J. Germino et al. (eds.), Exotic Brome-Grasses in Arid and Semiarid Ecosystems of the Western US, Springer Series on Environmental ManagementYear2016
- The nutritional content and tree top in the forests are evaluated of Abies religiosa, San Miguel Tlaixpan (SMT) and Rio Frio (RF), State of Mexico. The work had two parts. In the first, the nutritional content was evaluated in new foliage (N, P, K, Ca and Mg) in Abies religiosa trees, in periods of spring, summer and winter, in stands with different degrees of damage tree top. The results showed no correlation between the degree of damage of tree top and nutrient content variation in foliage, except for N and Mg with higher leaf content compared with the control RF site. Furthermore, no...AuthorsE.R Peña-Mendoza, A. Gómez-Guerrero, Mark E. Fenn, P. Hernández de la Rosa, D. Alvarado RosalesSourceRevista Mexicana de Ciencias Agrícolas. Special Issue No. 14: 2793-2805Year2016
- A study by Keane and Gray (2013) compared three sampling techniques for estimating surface fine woody fuels. Known amounts of fine woody fuel were distributed on a parking lot, and researchers estimated the loadings using different sampling techniques. An important result was that precise estimates of biomass required intensive sampling for both the planar intercept and fixed-area plot methods. This study explores Bayesian statistical methods as a means to reduce the sampling effort needed to obtain a desired precision. We found that Bayesian techniques dramatically increased the precision...AuthorsKathy Gray, Robert E. Keane, Ryan Karpisz, Alyssa Pedersen, Rick Brown, Taylor RussellKeywordsSourceRes. Note RMRS-RN-74. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 9 p.Year2016
- For thirty years, from the early 1840s, Charles Darwin documented the disappearance of flints in the grounds of Down House in Kent, at a location originally known as the “Stony Field”. This site (Great Pucklands Meadow – GPM) was visited in 2007 and an experiment set up in this ungrazed grassland. Locally-sourced flints (either large – 12 cm, or small – 5 cm dia.) were deposited at two densities within sixteen 1 m2 plots in a randomised factorial design. The area selected was distant from public access routes and remained unmown throughout the duration here reported. Fixed point photographs...AuthorsKevin R. Butt, Mac A. Callaham, E. Louise Loudermilk, Rowan BlaikKeywordsSourceApplied Soil EcologyYear2016
- Future liquid fuel demand from renewable sources may, in part, be met by converting the seasonally wet portions of the landscape currently managed for soil and water conservation to perennial energy crops. However, this shift may increase nitrous oxide (N2O) emissions, thus limiting the carbon (C) benefits of energy crops. Particularly high emissions may occur during the transition period when the soil is disturbed, plants are establishing, and nitrate and water accumulation may favor emissions. We measured N2O emissions and associated environmental drivers during the transition of...AuthorsDebasish Saha, Benjamin Rau, Jason P. Kaye, Felipe Montes, Paul R. Adler, Armen R. KemanianKeywordsSourceGlobal Change Biology BioenergyYear2016