Treesearch

The effects of species mix on stand structure and growth are evaluated for 117 pinyon (Pinus edulis Engelm.) and juniper (Juniperus monosperma (Engelm.) Sarg and J. osteosperma (Torr.) Little) woodlands of the southwestern United States. Maximum-size/density relations, leaf area and growth of pure and mixed-species woodlands are compared. Structure of pure and mixed-species woodlands appeared to be restricted by maximum-size/density relations. Maximum Stand Density Index (SDI) for mixed-species woodlands was 30% greater than for pure woodlands. Ceiling leaf areas were 3.6 for mixed-species,...

Site quality and growth-growing stock relations were developed for southwestern woodlands of pinyon (Pinus edulis) and one-seed juniper (Juniperus monosperma) or Utah juniper (J. osteosperma). Anamorphic height-age site index curves for pinyon were developed from a regional sample of 60 woodlands. Site index was unaffected by variation in stocking and was correlated with woodland yield when used in conjunction with density.

Broadly defined, intercropping of black walnut (Juglans nigra L.) refers to the production of one or more additional crops for food and/or fiber during all or part of the walnut rotation. lntercropping of walnut has been proposed for two main reasons: (1) to increase growth and/or quality of the walnut trees or (2) to provide an early financial return to help offset the costs associated with establishing the walnut plantation. Although a wide range of intercropping regimes can be proposed, few have been examined for their economic benefits or effects on walnut growth and quality. Needless...

Streamflow response to a rainstorm exceeding a 100-year return interval is documented in relation to the peat profile and microtopography. The water tab1e:discharge relation is corrected for specific yield and found to closely parallel the stage:discharge relationship for a level reservoir for flows up to a 25-year return interval. A faster water table:discharge relation occurs at higher flows when the mire develops wedge storage in the completely flooded, channel-like lagg around 2/3 of the mire perimeter. Flood frequency analysis was used to estimate a 25-year return interval peak flow...

Presents historic trends in the export of hardwood logs, lumber, veneer, and plywood. Discusses factors that will influence future hardwood product exports.

Evaluates the impact of cable logging technology, transportation network standards, and transport vehicles on stand management. Managers can use results to understand the impact of timber production costs on eastern hardwood management.

The equations presented allow the estimation of quality and quantity of logs produced from a hardwood stand based on cruise data. When packaged in appropriate computer software, the information will provide the mill manager with the means to estimate the value of logs that would be added to a mill yard inventory from a timber sale.

Hexazinone, Velpar-L?, applied at rates of 1 .O, 1.5, and 1.75 ml per spot, controlled competing hardwoods around 7-year-old underplanted white pine. Growth response was more pronounced when hexazinone was applied to release individual pines than when the entire area was treated on a 6 by 6- foot grid. In most cases, hexazinone killed white oak, chestnut oak, American beech, sourwood, red maple, and black gum. Yellow-poplar, red oak, cucumbertree, black cherry, sugar maple, sweet birch, and sassafras showed variable sensitivity to hexazinone. Three years after treatment, resprouting of...

In northern West Virginia, 60-year-old cherry-maple stands were thinned to 75,60, and 45 percent relative stand density. Analysis of 5-year growth data showed that basal-area growth was not reduced by thinning. Cubic-foot and board-foot volume growth decreased slightly. Individual-tree growth of all trees, dominant/codominant trees, and the 50 largest diameter trees per acre was significantly increased by thinning. Dominantkodominant trees in the 45 percent plots grew about 0.42 inch more in 5 years than those in the control plots. Optimum stand density probably is less than 60 percent...

In previously thinned, even-aged Appalachian hardwood stands, 5-year diameter growth of 102 wounded and 102 unwounded codominant crop trees were compared. A wounded crop tre was defined as one with at least one exposed sapwood logging wound at least 100 inch2 in size. An unwounded crop tree of the same species and size was selected near each of the 102 wounded trees. Five-year diameter growth of wounded crop trees averaged 1.34 inches, while unwounded crop trees averaged 1.40 inches. Paired t-test showed no significant differences in 5-year diameter growth between wounded and unwounded...