Model can help forest managers better maintain forests by predicting which trees will survive
Land managers, forestry professionals and conservationists seek to predict how trees will grow so they can better manage existing forests and regrow forests after logging operations. Previous tree growth models can reasonably predict how trees grow once they are about 20 years old and achieve "crown closure" with the trees in the forest around them.
Crown closure occurs when trees in a specific area grow wide and tall enough that their canopies connect. Now, University of Missouri researchers have created a new statistical model that accurately predicts tree growth from when they are first planted until they reach crown closure.
For their study, Lance Vickers, a former doctoral student at MU, and his adviser David Larsen, a professor of forestry in the MU College of Agriculture, Food and Natural Resources, built tree growth statistical equations that describe the process of early tree growth.
Larsen says being able to accurately predict how a stand of trees will grow as soon as they are planted is important for forest managers to effectively grow and maintain forests. He says the model can be applied to forests in any climate zone.
"Only about 10 percent of planted saplings will survive to reach crown closure when they are about 20 years old," Larsen said. "If forest managers can accurately predict which 200 out of 2,000 saplings will survive in a given acre of forest, those managers can spend their time more efficiently by protecting those trees and cutting back trees that will not survive, but still compete with surviving trees for resources."
To create their statistical model, Vickers and Larsen collected data from the Missouri Ozark Forest Ecosystem Project (MOFEP) which is a state-funded project that is studying Missouri forest ecosystems over the course of 100 years.
Vickers and Larsen used tree growth data from dozens of trees that have grown since the project began in 1990 to develop their tree growth model. Larsen says the long-term tree growth data they collected helped to make this new model much more flexible than previous growth models.
"One of the reasons previous models are unable to predict early tree growth is the huge amount of variability that exists when a number of trees are growing near each other," Larsen said. "The angles tree grow, how much water they consume and the terrain of the land are just a few of the dozens of factors that play roles in which trees will survive past adolescence and which will not. This new model takes all of those factors into account and has helped to create a new understanding of how trees grow in proximity to each other."
The study, "The Impact of Overstory Density on Reproduction Establishment in the Missouri Ozarks - Models for Simulating Regeneration Stochastically," was published in Forest Science.
Nathan Hurst | EurekAlert!
Faba fix for corn's nitrogen need
11.04.2018 | American Society of Agronomy
Wheat research discovery yields genetic secrets that could shape future crops
09.04.2018 | John Innes Centre
At the Hannover Messe 2018, the Bundesanstalt für Materialforschung und-prüfung (BAM) will show how, in the future, astronauts could produce their own tools or spare parts in zero gravity using 3D printing. This will reduce, weight and transport costs for space missions. Visitors can experience the innovative additive manufacturing process live at the fair.
Powder-based additive manufacturing in zero gravity is the name of the project in which a component is produced by applying metallic powder layers and then...
Physicists at the Laboratory for Attosecond Physics, which is jointly run by Ludwig-Maximilians-Universität and the Max Planck Institute of Quantum Optics, have developed a high-power laser system that generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. The researchers envisage a wide range of applications for the technology – in the early diagnosis of cancer, for instance.
Molecules are the building blocks of life. Like all other organisms, we are made of them. They control our biorhythm, and they can also reflect our state of...
University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.
Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.
Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.
Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...
Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.
The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...
13.04.2018 | Event News
12.04.2018 | Event News
09.04.2018 | Event News
25.04.2018 | Physics and Astronomy
25.04.2018 | Materials Sciences
25.04.2018 | Studies and Analyses