By Amy Androff
Could looking through trees be the view to a greener future? Trees replacing the clear pane glass in your windows is not a work of science fiction. It’s happening now.
Forest Products Laboratory (FPL) researcher Junyong Zhu in co-collaboration with colleagues from the University of Maryland and University of Colorado, have developed a transparent wood material that may be the window of tomorrow. Researchers found that transparent wood has the potential to outperform glass currently used in construction in nearly every way.
Their findings were published in the Journal of Advanced Functional Materials in their paper, “A Clear, Strong, and Thermally Insulated Transparent Wood for Energy Efficient Windows.”
While glass is the most common material used in window construction it comes with a costly economic and ecological price.
Heat easily transfers through glass, especially single pane, and amounts to higher energy bills when it escapes during cold weather and pours in when it’s warm. Glass production in construction also comes with a heavy carbon footprint. Manufacturing emissions are approximately 25,000 metric tons per year.
Now, transparent wood is emerging as one of the most promising materials of the future.
Transparent wood is created when wood from the fast-growing, low-density balsa tree is treated to a room temperature, oxidizing bath that bleaches it of nearly all visibility. The wood is then penetrated with a synthetic polymer called polyvinyl alcohol (PVA), creating a product that is virtually transparent.
The State of Canada’s Forests Annual Report provides a national snap shot of Canada’s forests and forest industry. We’ve been tracking our journey toward sustainable forest management for 28 years. This year’s report focuses on the theme “faces of forestry” and features the innovative ways people work and learn in forests.
By Robert Beanblossom
Nestled in a mountainous valley known as the Pink Beds is the Cradle of Forestry in America, a national historic site. This spot in the heart of the Pisgah National Forest is aptly named for it is the birthplace of scientific forestry in the United States.
This story begins in early 1888. That year a wealthy young man, George Washington Vanderbilt, traveled to the nearby town of Asheville along with his mother, who sought relief from malarial-like symptoms. Dr. S. Westray Battle, a retired U.S. Navy surgeon and a highly respected pulmonary specialist with a practice there, subsequently provided Mrs. Vanderbilt’s medical treatment while she and her son stayed at the posh Battery Park Hotel.
The clean air, scenic mountains and natural beauty of the area quickly captivated Vanderbilt, a widely-traveled, well-read individual, who considered himself a poet at heart.
Consequently, he fell in love with this land and immediately decided to build a luxurious mansion, later named Biltmore, and to purchase property. By 1895 he could claim ownership to more than 125,000 acres of forest land; but much of it had been heavily damaged by fire, grazing and poor logging practices. There were, however, virgin stands of high quality trees especially in the coves and on North and east facing slopes of his holdings.
Vanderbilt employed the foremost architect of the day, Richard Morris Hunt, to design his 255-room mansion but also hired an equally famous landscape architect, Fred-rick Law Olmsted, to design the grounds of the estate. Olmsted, known for designing New York’s Central Park, the U.S. Capitol grounds and other notable venues, suggested to Vanderbilt that a forester be hired to manage his newly-acquired holdings. There was one problem. Only two foresters were practicing in America at the time. One was a German forester, Bernard Fernow, who happened to be already working with the Department of Agriculture in Washington, D.C. The other was a 27-year-old Pennsylvanian, Gifford Pinchot.
Pinchot, who came from a wealthy family himself, had graduated from Yale and had studied forestry, on the advice of his father, in France for 13 months. Anxious to get started in his chosen profession, he accepted Vande-rbilt’s offer of employment and came to the Biltmore Estate in early February, 1892. His plans for forest management included selection cutting for sustained yield. Stands not adequately stocked with trees were planted with hardwoods and pine.
Later, in writing of his experience, he stated, “… Thus, Biltmore became the beginning of practical forestry in America. It was the first piece of woodland to be put under a regular system of forest management whose object was to pay the owner while improving the forest.”
…Vanderbilt’s widow, Edith, sold the 87,500-acre Pink Beds tract to the U.S. Forest Service in 1914; it ultimately became part of the Pisgah National Forest. While all of those lands played a role in the origin of forestry, The Cradle of Forestry in America has special significance. Congress carved out and designated 6,500 acres as a national historic site in 1968. Here four firsts can be identified: the first trained American forester; the first managed forest; the first school of forestry in America and the first national forest created under the Weeks Act of 1911.
In July 2014, DECC published the Bioenergy Emissions and Counterfactual (BEAC) model, which investigates the impact on carbon emissions of various ways of sourcing woody biomass from North America to produce electricity in the UK. The calculator estimates the greenhouse gas intensity by taking into account the counterfactual land use for the scenario (i.e. what the land or wood would have been used for if it was not used for bioenergy). BEAC shows that some scenarios could save considerable carbon emissions compared to fossil fuels, whilst if others occurred they could cause emissions greater than fossil fuels. BEAC did not assess the likelihood of particular scenarios so, in spring 2015, DECC commissioned an independent study (led by Ricardo-AEA and including North American forestry experts) to assess the likelihood that the most carbon intensive BEAC scenarios are happening now or if they might happen in the future, and what might drive or constrain them.
The study found that the majority of the high carbon scenarios identified in the BEAC report are unlikely to occur, but there are four that may be already happening or may happen in the future, although their scale is likely to be limited or uncertain.
The research identified economic decision making as driving forestry practices: the main value of a tree is in sawtimber, not biomass for wood pellet production. It is therefore unlikely that demand for biomass would cause foresters to change behaviour to harvest sooner than they intended, or to switch to supplying wood for bioenergy, but they may increase the intensity with which they manage forests.
ACS Sustainable Chem. Eng., 2016, 4 (12), pp 6355–6361
The use of renewable biomass for production of heat and electricity plays an important role in the circular economy. Degradation of wood biomass to produce heat is a clean and novel process proposed as an alternative to wood burning, and could be used for various heating applications. So far, wood degradation has mostly been studied at ambient temperatures. However, the process needs to occur at elevated temperatures (40–55 °C) to produce useable heat. Our objective was to study wood degradation at elevated temperatures for its potential application on heat production. Two (a thermotolerant and a thermophilic) fungi with different degradation strategies were chosen: lignin-degrading Phanerochaete chrysosporium and cellulose-degrading Chaetomium thermophilum. Each fungus was inoculated on nonsterile and sterile birch woodblocks to, respectively, study their wood degradation activity with and without natural biota (i.e., microorganisms naturally present in wood). The highest wood decay rates were found with C. thermophilum in the presence of natural biota, followed by P. chrysosporium under sterile conditions. The estimated theoretical value of heat production with C. thermophilum under nonsterile conditions was 0.6 W kg–1 wood. In conclusion, C. thermophilum seems to be a promising fungus to degrade wood together with natural biota, as sterilization of wood is not feasible in practice. Further testing on a larger scale is needed to implement the obtained results and validate the potential of biological wood degradation for heat production.
BY ALEX SHASHKEVICH
To this day the U.S. government owns almost half of the land in the American West.
That level of control has been debated ever since the government began acquiring the areas in the 19th century, with some Westerners resenting the vastness of the federal authority, which amounts to 47 percent of land in 11 states. Some states, like Nevada, where the government owns 84.5 percent of the land, see more control than others.
But few know about the existence and history of revenue-sharing programs, with some dating to 1906, through which the federal government has been compensating states and counties for lost tax revenue on the lands it controls.
Now, thanks to historian Joseph “Jay” Taylor’s research and a team at Stanford’s Center for Spatial and Textual Analysis (CESTA), the history and geography of those programs are presented in Follow the Money: A Spatial History of In-Lieu Programs for Western Federal Lands, an interactive website that maps federal payments made to counties and states in the American West over the past 100 years.
The Food and Agriculture Organization of the UN (FAO) Forestry Department and its partners published ‘National Socioeconomic Surveys in Forestry: Guidance and Survey Modules for Measuring the Multiple Roles of Forests in Household Welfare and Livelihoods’. The Sourcebook aims to fill the data gap on the contributions that forests and wild products make to livelihoods and well-being. The modules and guidance presented aim to build the capacity of national statistical offices to integrate forest values into national household surveys, in particular surveys based on the World Bank’s Living Standards Measurement Study (LSMS).
Changes in climate and extreme weather are already increasing challenges for forest ecosystems across the world. Many impacts are expected to remain into the future. This means forest managers, conservationists and woodland owners continually need to address climate change to ensure forests can provide a broad array of benefits and services. The USDA Northern Forests Climate Hub and the U.S. Forest Service provide tools to help address this need.
Collaboration between scientists and managers resulted in the publication Forest Adaptation Resources: Climate Change Tools and Approaches for Land Managers. This publication provides a suite of materials enabling land managers to consider the likely effects of climate change and increase the ability of forests to cope with climate change impacts.
Laurel wilt is caused by Raffaelea lauricola, a fungal pathogen transmitted by the ambrosia beetle Xyleborus glabratus. This beetle and fungus are native to southern Asia, and the beetle was first detected in Georgia in 2002. This disease impacts several trees in the family Lauraceae, including redbay, sassafras, pondspice, bay laurel, and avocado. Extensive mortality to redbay has occurred in coastal areas from North Carolina to Mississippi, with detections also occurring inland in Alabama, Louisiana, and Arkansas. Infected trees generally die within months, often showing a full crown of dead, brown leaves. There is no cure once a tree has this disease. Preventing the spread of this disease by transporting firewood is of the utmost importance, as management options are limited. Current management involves sanitation (chipping, burning) of infested material, and chemical treatments may be effective for high value trees.
This fungus may be called many names – including annosum root rot, annosus root rot, or Heterobasidion root rot – and is caused by Heterobasidion irregulare (formerly named Heterobasidion annosum and Fomes annosus). This fungus is present throughout North America, has a very wide host range, and is commonly found in southeastern U.S. forests. The fungus causes root decay, although infected trees may survive for many years after infection. Weakened roots are at an increased risk of windthrow. Infected roots generally show heavy resin leakage, and the spread of the fungus through root grafts may cause pockets of tree mortality. Fungal spores are also spread by wind, and often infect stumps from recently harvested forest stands. Annosum root rot is most common on deep, sandy soils or former agricultural land. Prevention is the best way to manage this disease, but post-treatment of stumps with borax can limit fungal spread.