Resources by Matthew Yancey

Title Available As Summary Date ID Author
Measuring Site Index
Site index (SI) is a measurement commonly used by foresters to describe the productivity of a site. Typically this measurement is used to describe sites growing well-stocked even-aged forests. Site index is the average height of the dominant1 and codominant2 trees on the site, at a given age (base age). Typically, the base age for hardwoods and white pine in Virginia is 50 years, while the base age for loblolly pine is 25 years. For example, a SI of 75, base age 50, means that the average height of the dominant and codominant trees on a site will be 75 feet when they are 50 years old (SI50=75). The higher the SI, the higher the site productivity (trees will grow faster than on a site with a lower SI).
Dec 3, 2014 2812-1028 (ANR-125NP)
Evaluation of Household Water Quality in Rockingham County, Virginia, August-September 2009, Virginia Household Water Quality Program Nov 29, 2010 3010-1515
Invasive Exotic Plant Species Identification and Management
Invasive exotic species are plants that are not native to a given area and have the ability to out-compete indigenous plant species. Invasive exotics are often brought into their non-native surroundings by humans with good intentions.
Mar 18, 2015 420-320(AREC-106P)
Invasive Exotic Plant Species: Autumn Olive (Elaeagnus umbellata)
Autumn olive was introduced to the U.S. from Japan and China in 1830. It was originally planted for wildlife habitat, shelterbelts, and mine reclamation, but has escaped cultivation. It is dispersed most frequently by birds and other wildlife, which eat the berries.
Dec 3, 2014 420-321 (ANR-123P)
Invasive Exotic Plant Species: Ailanthus (Ailanthus altissima)
Ailanthus, also known as tree-of-heaven and paradise- tree, is a major nuisance to foresters, farmers, and homeowners alike. Its prolific seeding and ability to sprout from roots and stumps and grow quite rapidly just about anywhere make it a serious competitor and threat to native species and cultivated crops. On top of that, ailanthus is allelopathic, producing substances that are toxic to and inhibit the growth of neighboring plants.
May 4, 2015 420-322(ANR-122P)
Invasive Exotic Plant Species: Honeysuckle (Lonicera spp.)
Several species of Asian honeysuckle have been introduced in the United States for their ornamental and wildlife values. Honeysuckle is perhaps the most widespread exotic invasive in the U.S., now found in at least 38 states. The Asian honeysuckle produces abundant seeds which are dispersed by birds and other wildlife. It also spreads by sprouting from its roots. Because it tolerates shade from other plants, it grows in forest understories.
Jan 20, 2015 420-323(ANR-124P)
Characteristics of Common Western Virginia Trees
Forest management is a complex process. Silviculture—a system in which healthy communities of trees and other vegetation are established and maintained for the benefit of people—uses forest ecology to guide complex management prescriptions that mimic forest disturbances and processes. Silvics—the natural characteristics of trees—play an important role in prescribing effective silviculture.
Dec 15, 2014 420-351 (ANR-118NP)
Tips for Profitable Variety Selection: How to Use Data From Different Types of Variety Trials Jul 29, 2011 424-040