Treesearch

Peat materials from 12 bogs in northern Minnesota, U.S.A., showed significant differences in physical properties. It is pointed out that 1) these properties can be related to the hydrology of organic soils only if the soils represent undisturbed field conditions, and 2) volumetric expressions of water content are necessary to correctly evaluate the amount of water in a peat profile. The differences in physical properties were related to degree of decomposition as measured by bulk density and fibre content. Undecomposed peats with low bulk density and high fibre content contain many large...

Measurements of precipitation, runoff, and bog water table levels have provided data for the calculation of evapotranspiration from two forested peatland watersheds near Grand Rapids, Minnesota (ca. 47? 32'N, 93? 28'W). Continuous hydrologie records were collected on one experimental bog for 6 years (1961-1966) and on the other for the past 2 years (1965-1966). Water level changes in each bog were converted to inches-depth of storage by water yield coefficients for specific peat horizons and used to adjust precipitation-runoff calculations. Evapotranspiration estimates for the growing-seaso...

A comprehensive peatland hydrology study has provided data on the climate, hydrogeology, water table levels, and run-off from forested peat deposits in northern Minnesota. Groundwater studies identified two types of hydrogeologic situations-perched bogs, independent of the underground flow system, and groundwater bogs, which were influenced by storage changes in the surrounding groundwater basin. Because the water tables are near the surface in undisturbed bogs, they are important in peatland hydrology. Bog water table levels indicated storage opportunity, and their reaction to precipitatio...

Nine managers of public campgrounds comment on their relations with their campers and some of the management problems they have. Topics include camping fees, reactions to survey interviews, registration procedures, campers' pets, and maintenance of facilities.

A study of advanced sugar maple reproduction on a good site in West Virginia indicated that considerable improvement of stem form takes place after selection cutting in the overstory. The study stems were 1 to 6 inches in d.b.h. and many of them were over 50 years old. To an appreciable extent, flat bps and minor crooks were overcome after partial release.

In spoil-bank revegetation the emphasis today is on site protection. Quick cover crops overplanted to trees or shrubs are recommended on many sites. In this study we tried to determine how an established fescue cover affects tree survival and growth. We found the ground cover did not affect survival but did reduce the height growth of sycamore and sweetgum. It had little effect on growth of white pine and loblolly pine.

Vacuum pumping more than doubled maple sap yield from tubing installations on nearly level land during the 1968 season. Increased yields were greatest when sap had to move slightly uphill.

Lime applications were essential to establishment of crownvetch (Coronilla vuria L.) on coal breaker refuse in the Pennsylvania Anthracite Region, and mulch treatments were highly beneficial. Fertilizer applications had only slight effect on either establishment or growth.

Describes a new method for testing site-index curves. Study results indicate that Vermont site-index curves for yellow birch, paper birch, white ash, and sugar maple, and New York-Connecticut curves for red maple, can be applied satisfactorily in New Hampshire when used with certain precautions and corrections.

A description of a FORTRAN IV computer program that is used for making Scheffé's S-contrasts in one-way analyses.