Treesearch

Backcountry areas have been suggested as recreation alternatives to wilderness. A problem with the concept is that areas which could be managed as backcountry are already used by recreationists. Visitors to a wilderness in Oregon and to a nondesignated roadless area in northern Idaho held many of the same values and sought the same kind of experiences. Therefore. redistribution, as proposed by backcountry proponents, may be equivalent to shifting use from officially designated wilderness to de facto wilderness rather than from wilderness to a backcountry recreation area.

Many exotic hybrid Populus clones grown under short-rotation intensive culture (SRIC) in the Lake States region of the U.S.A. retain green leaves in the autumn for 2-6 weeks after native aspen (P. tremuloides and P. grandidentata) have lost their leaves. Leaves on the terminal shoots of five such clones tested in southern Michigan and northern Wisconsin had substantial leaf conductances to C02 and photosynthetic rates (PG) during this late-season period of leaf retention. PG was high enough to suggest that autumn retention of green leaves may be an important factor contributing to the...

Presents a method for estimating the potential impact of gypsy moth attacks on forest-stand value. Robust regression analysis is used to develop an equation for predicting the rate of change in timber value from easy-to-measure key characteristics of stand condition.

Timber-use studies in Ohio show that multiproduct harvesting could be improved. The recovery rate from these operations, expressed as a ratio of the merchantable stem biomass estimate, is 103 percent. Although current methods of multiproduct harvesting have improved recovery of the merchantable stem, an estimated 1,539 thousand fresh tons of total residual biomass were left unused in 1978. Modifications of present multiproduct harvesting systems could increase the recovery of aboveground biomass.

Dense ground covers of fern and grass interfere with the regeneration of Allegheny hardwoods. An herbicide containing N-phosphonomethyl glycine controls the fern and grass, but also kills advance reproduction of desirable tree species. Preliminary results of an experiment comparing regeneration 3 years after herbicide-clearcuts and herbicide-shelterwood seed cuts showed that the amount of desirable hardwood reproduction was substantially greater in the shelterwood treatment than in the clearcuts. Clearcuts were dominated by black cherry, whereas shelterwood cuts contained nearly equal...

A report on a 1978 survey of private forest-land owners, based on 11,076 questionnaires. About 7.8 million ownership units hold 333 million acres of privately owned forest land in the United States. Regional and subregional breakdowns are included for such important variables as form of ownership; owner's occupation, age, sex, race, residence, and education; size class of ownership, etc. An important finding at the national level was that nearly half of the private forest land is in ownerships of greater than 500 acres; it is owned by less than 1 percent of the ownership units. These data...

Describes the use of a remote 35-mm data-recording camera to observe daily the growth and quality development of a 27-acre clearcut.

Tapping sugar maples for sap production yields an annual income, but there is a loss in timber quality if the tree is cut for factory lumber products. We estimate an average loss per tree of $2.87 based on a sample of 90 trees in Vermont that were formerly tapped.

Use of the guides presented here will enable selection of Allegheny hardwood stands most likely to regenerate successfully after clearcutting. The guides are based on how well before-logging criteria predicted success in a number of stands 5 years after cutting. In comparison to earlier information, these guidelines recommend more small reproduction and higher quality, though fewer, stems of large reproduction. Guides to evaluate regeneration after cutting, based on both number and height of stems, are included also.

Describes a technique using cannulas, surgical tubing, and small containers to obtain sap samples for use in determining the sugar content of sap in small sugar maple trees. This technique is used on trees directly exposed to the weather, and sets a minimum tappable tree diameter of 1.5 cm.