Treesearch
Displaying 10,971 - 10,980 of 65,202 Publications- Although northern temperate forests account for a substantial portion of global soil carbon stocks, the relationship between soil carbon and management remains unclear. As the active management of forests and associated forest product industries is often cited as a tactic to offset global greenhouse gas emissions, quantifying the effect of management activities on soil carbon pools is paramount to mitigating future climate change. Hence, our goal was to identify commonalities among the spatial variability, potential drivers, and total soil carbon stocks and concentrations at two locations...AuthorsFiona V Jevon, Anthony W. D'Amato, Christopher W. W. Woodall, Kevin Evans, Matthew P. Ayres, Jaclyn Hatala. MatthesKeywordsSourceForest Ecology and ManagementYear2019
- Evidence of increased biotic disturbances in forests due to climate change is accumulating, necessitating the development of new approaches for understanding the impacts of natural disturbances on human well-being. The recent Mountain Pine Beetle (MPB) outbreak in the western United States, which was historically unprecedented in scale, provides an opportunity for testing the adequacy of the life satisfaction approach (LSA) to estimate the impact of large-scale forest mortality on subjective well-being. Prior research in this region used the hedonic method (HM) to estimate the economic...AuthorsTom Holmes, Frank H. H. KochKeywordsSourceForestsYear2019
- This paper describes the formation of, and initial results for, a new FLUXNET coordination network for ecosystem-scale methane (CH4) measurements at 60 sites globally, organized by the Global Carbon Project in partnership with other initiatives and regional flux tower networks. The objectives of the effort are presented along with an overview of the coverage of eddy covariance (EC) CH4 flux measurements globally, initial results comparing CH4 fluxes across the sites, and future research directions and needs. Annual estimates of net CH4 fluxes across sites ranged from -0.2 ± 0.02 g C m-2...AuthorsSara H. Knox, Robert B. Jackson, Benjamin Poulter, Gavin McNicol, Etienne Fluet-Chouinard, Zhen Zhang, Gustaf Hugelius, Philippe Bousquet, Josep G. Canadell, Marielle Saunois, Dario Papale, Housen Chu, Trevor F. Keenan, Dennis Baldocchi, Margaret S. Torn, Ivan Mammarella, Carlo Trotta, Mika Aurela, Gil Bohrer, David I Campbell, Alessandro Cescatti, Samuel Chamberlain, Jiquan Chen, Weinan Chen, Sigrid Dengel, Ankur R. Desai, Eugenie Euskirchen, Thomas Friborg, Daniele Gasbarra, Ignacio Goded, Mathias Goeckede, Martin Heimann, Manuel Helbig, Takashi Hirano, David Hollinger, Hiroki Iwata, Minseok Kang, Janina Klatt, Ken W. Krauss, Lars Kutzbach, Annalea Lohila, Bhaskar Mitra, Timothy H. Morin, Mats B. Nilsson, Shuli Niu, Asko Noormets, Walter C. Oechel, Matthias Peichl, Olli Peltola, Michele L. Reba, Andrew D. Richardson, Benjamin R. K. Runkle, Youngryel Ryu, Torsten Sachs, Karina V R. Schäfer, Hans Peter Schmid, Narasinha Shurpali, Oliver Sonnentag, Angela C. I Tang, Masahito Ueyama, Rodrigo Vargas, Timo Vesala, Eric J. Ward, Lisamarie Windham-Myers, Georg Wohlfahrt, Donatella ZonaSourceBulletin of the American Meteorological SocietyYear2019
- Poplar wood was fractionated under a range of conditions using an inexpensive and recyclable commercial aromatic acid, p-toluenesulfonic acid (p-TsOH), as an acid hydrotrope (AH). The fractionated cellulose-rich solid fraction demonstrated excellent physical and optical properties as papermaking fibers. The dissolved xylose can be dehydrated into furfural using the p- TsOH in the spent liquor without additional catalysts. The acid hydrotrope dissolved lignin (AHL) has high β-aryl ether linkage content (∼60%) and high molecular weight (∼4000 Da), similar to that of mill wood lignin (MWL)....AuthorsJinlan Cheng, Kolby Hirth, Qianli Ma, Junjun Zhu, Zhaojiang Wang, Junyong ZhuKeywordsSourceIndustrial & Engineering Chemistry Research. 58(17): 7063-7073.Year2019
- Nanocellulose has potential as a reinforcing agent to improve stiffness and strength in polymer fiber; however, the inherent difference in hydrophilicity makes it challenging to incorporate it into nonhydrophilic polymers, and the composite properties are strongly anisotropic. In the present work, a dual approach was employed to incorporate cellulose nanofibrils (CNFs) into polylactic acid (PLA). Polyethylene glycol (PEG) acted as a compatibilizating agent to enable the melt spinning of CNF/PLA composite fibers without water/solvent, and CNFs were surface modified to improve compatibility,...AuthorsCaitlyn M. Clarkson, Sami M. El Awad Azrak, Reaz Chowdhury, Shoumya Nandy Shuvo, James Snyder, Gregory Schueneman, Volkan Ortalan, Jeffrey P. YoungbloodKeywordsSourceACS Applied Polymer Materials. 1(2): 160-168.Year2019
- We conducted the frst comparative exploration on lignin containing cellulose nanofibril films prepared alternatively from willow bark and wood using a highly recyclable acid hydrotrope, aqueous p-toluenesulfonic acid, as a sustainable means for isolating the nanofibrils. The nanofibrils of willow bark were hydrophobic and produced dense films of high strength under hot pressing. The hydrophobicity resulted from condensation of the residual lignin with low molecular weight aromatic substances of the bark and hydroxymethyl furfural formed in situ from fructose that is also present in the bark.AuthorsJinze Dou, Huiyang Bian, Daniel J. Yelle, Mariko Ago, Krista Vajanto, Tapani Vuorinen, Junyong ZhuKeywordsSourceIndustrial Crops and Products. 129: 15-23.Year2019
- Forest soil ecosystems can be negatively affected by intensive biomass harvesting due to losses of organic inputs and soil compaction, ultimately leading to reduced forest productivity. In this research, we revisited a site from the North American Long-Term Soil Productivity study located on a sandy Spodosol within the Huron National Forest in Michigan, USA, to measure the effects of aboveground organic matter removal of different intensities (three levels: bole only; whole tree harvest; or whole tree harvest and forest floor removal) and soil compaction (2 levels: no or moderate compaction...AuthorsTera E. Lewandowski, Jodi A. Forrester, David J. Mladenoff, Erika Marin-Spiotta, Anthony W. D'Amato, Brian J. J. Palik, Randy KolkaKeywordsSourceSoil Biology and BiochemistryYear2019
- Residents’ participation is key to the success of urban tree planting programs, yet a gap between resident intentions and participation actions may limit the benefits provided by such programs. Philadelphia Parks and Recreation (Pennsylvania, US) has conducted tree giveaway events for residents since 2012 with the goal of increasing tree canopy. But some residents who register for giveaway events do not follow through and attend the event, creating logistical and planning difficulties that increase program costs. We tested whether phone call reminders could narrow the intention-action gap...AuthorsMichael Hand, Lara Roman, Dexter H. Locke, Erica Smith FichmanKeywordsSourceUrban Forestry and Urban Greening. 44: 126425.Year2019
- Assessment of surface water quality in the Mississippi Delta is essential to quantify the eutrophication of the Gulf of Mexico. This study estimated the characteristics and variations of surface water quality at three study sites in the Big Sunflower River Watershed (BSRW) within the Mississippi Delta using Kruskal- Wallis, Dunn, Mann-Kendall, and Pettitt tests. In general, contents of some water quality constituents such as nitrate-nitrogen (NO3 − N) and total phosphorus (TP) in the BSRW varied from site to site each year, whereas variations of other constituents such as pH and dissolved...AuthorsYing Ouyang, Gary Feng, Prem Parajuli, Ted Leininger, Yongshan Wan, Johnie N. JenkinsSourceWater, Air, & Soil PollutionYear2019
Projection of 21st century irrigation water requirement across the Lower Mississippi Alluvial Valley
Lower Mississippi Alluvial Valley (LMAV) is the largest floodplain and one of the most productive agricultural regions in the United States. Irrigation is widely used in this region to improve crop production and resource use efficiency due to a mismatch between crop water requirements and precipitation timing and quantity during the growing season. In the recent decades, aquifer decline caused by groundwater withdrawals for irrigation has been recognized as a critical environmental issue threatening water security and agricultural sustainability in the LMAV. To improve agricultural water...AuthorsJia Yang, Wei Ren, Ying Ouyang, Gary Feng, Bo Tao, Joshua J. Granger, Krishna P. PoudelKeywordsSourceAgricultural Water ManagementYear2019