Treesearch

This report assesses past and prospective carbon stocks for 4.5 million ha of forest land in northern Wisconsin, including a baseline assessment and analysis of the impacts of disturbance and management on carbon stocks. Carbon density (amount of carbon stock per unit area) averages 237 megagrams (Mg) per ha, with the National Forest lands having slightly higher carbon density than other ownership classes. Over the last decade, carbon stocks of northern Wisconsin forests have been increasing by about one teragram (Tg) per year or 0.22 megagrams per ha per year, with most of the increase in...

The U.S. Department of Agriculture, Forest Service silvicultural experiment on the Penobscot Experimental Forest (PEF) in Maine represents 60 years of research in the northern conifer and mixedwood forests of the Acadian Forest Region. The objective of this data management effort, which began in 2008, was to compile, organize, and archive research data collected in the U.S. Forest Service silvicultural experiment and several auxiliary studies. Due to the hierarchical nature of these data, a relational database management system (RDMS) was used (Microsoft Office Access). The resulting data...

MillionTreesNYC is an ambitious campaign to plant and care for one million new trees in New York City. Implemented by the City of New York Department of Parks & Recreation and the nonprofit New York Restoration Project, this innovative, citywide effort crosses property jurisdictions and physical sites. The goal is to enhance the entire 'green matrix' of the urban forest across streets, recreational parks, natural areas, schools, public housing campuses, and private yards. A healthy urban forest helps make New York City 'greener and greater' and supports the goals of the city's sustainabilit...

The Acadian Forest Ecosystem Research Program (AFERP) began in 1994 as one of the nation's first trials of natural disturbance-based silviculture. The study tests the ecological impacts of two versions of expanding-gap silvicultural systems that are designed to emulate the spatial extent and frequency of natural disturbances in northeastern North America. The AFERP is now well into its second decade of monitoring. Inventory systems for overstory trees, saplings, herbaceous plants, tree regeneration, coarse woody debris, forest floor depth, and canopy light interception are described in...

A recent series of bark beetle outbreaks in the Rocky Mountain region of the U.S. is the largest and most intense ever recorded. Factors contributing to tree mortality from bark beetles are complex, but include aspects of forest stand condition. Because stand conditions respond to forest management, evaluating bark beetle-caused tree mortality and changes in forest structural attributes in areas previously subjected to management not only improves mechanistic understanding of beetle-caused changes in forests, but also improves prediction of future bark beetle responses to management...

The Penobscot Experimental Forest (PEF) in Maine has been the site of U.S. Department of Agriculture, Forest Service, Northern Research Station (previously Northeastern Forest Experiment Station) research on northern conifer silviculture and ecology since 1950. Purchased by forest industry and leased to the Forest Service for long-term experimentation, the PEF was donated to the University of Maine Foundation in 1994. Since that time, the University and the Forest Service have worked in collaboration to advance the PEF as a site for research, demonstration, and education. This publication...

Though the U.S. Department of Agriculture, Forest Service has been studying the forests of the northeastern United States since the late 1800s, long-term studies were not common until experimental forests were introduced in the 20th century. These forests were established for long-term experimentation, and research questions were defined by local forest management needs. The Penobscot Experimental Forest (PEF) in east-central Maine is an example of the success and evolution of the experimental forest model. The PEF was purchased by forest industry for research by the Forest Service, and...

Our understanding of the long-term carbon (C) cycle of temperate deciduous forests and its sensitivity to climate variability is limited due to the large temporal dynamics of C fluxes. The goal of the study was to quantify the effects of environmental variables on the C balance in a 70-year-old mixed-oak woodland forest over a 7-year period in northwest Ohio, USA. The net ecosystem exchanges (NEE) of C were measured using the eddy-covariance technique. Long-term mean NEE, ecosystem respiration (ER), and gross ecosystem productivity (GEP) were 339 ± 34, 1213 ± 84, and 1552 ± 82 g C m-2...

The Penobscot Experimental Forest (PEF) was established more than 60 years ago as a result of private forest landowners' interest in supporting forest research in Maine. In 1950, nine pulp and paper and land-holding companies pooled resources and purchased almost 4,000 acres of land in east-central Maine. The property was named the Penobscot Experimental Forest and was leased to the U.S. Department of Agriculture, Forest Service for 99 years to provide a location for long-term forest management research in a mixed northern conifer forest. The PEF is large enough to encompass a variety of...

Established between 1952 and 1957, the U.S. Department of Agriculture, Forest Service experiment comparing several silvicultural treatments is not only the centerpiece of research on the Penobscot Experimental Forest in Maine, it is also one of the longest-running, replicated studies of how management techniques influence forest dynamics in North America. Ten treatments representing even- and uneven-aged silvicultural systems and exploitative cutting are replicated twice on operational-scale experimental units averaging 21 acres in size. Treatments are applied uniformly to experimental...