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Articles 1 - 19 of 19
Full-Text Articles in Forest Sciences
Resource Use In The Trinational Sangha River Region Of Equatorial Africa: Histories, Knowledge Forms, And Institutions, Heather E. Eves, Rebecca Hardin, Stephanie Rupp
Resource Use In The Trinational Sangha River Region Of Equatorial Africa: Histories, Knowledge Forms, And Institutions, Heather E. Eves, Rebecca Hardin, Stephanie Rupp
Yale School of the Environment Bulletin Series
This volume is based on an international conference, “Natural Resource Use Relations in the Trinational Sangha River Region of the Northwest Congo Basin,” held at Yale University in September 1997. In recognition of the bilingual context in which conservation occurs in the three countries of the Sangha region — Cameroon, Central African Republic, and Congo — all sessions of the conference were conducted simultaneously in French and English. This publication, which is a complete rendering of the conference papers and discussion sessions, is available in its entirety in both French and English.
The Tympanis Canker Of Red Pine, John Raymond Hansbrough
The Tympanis Canker Of Red Pine, John Raymond Hansbrough
Yale School of the Environment Bulletin Series
A new disease of red pine has recently been found in southern Connecticut, Rhode Island, eastern Massachusetts, western and central New York, northern New Jersey, eastern Pennsylvania, central Ohio, and southern Michigan. It is of serious consequence only on plantation-grown red pine, but it also occurs occasionally on eastern white pine. On the former host it is characterized by axially elongated, annual main-stem cankers which are always centered at the nodes. Infection takes place through adhering lateral dead branches and the growth of the fungus after it gains entrance to the stem.is usually very rapid-Le., cankers up to three feet …
Ecological Relations In The Pitch Pine Plains Of Southern New Jersey, Harold J. Lutz
Ecological Relations In The Pitch Pine Plains Of Southern New Jersey, Harold J. Lutz
Yale School of the Environment Bulletin Series
An investigation was undertaken with the primary object of determining the factors responsible for the peculiar development of the vegetation in the Plains community. The conclusion ·is reached that the Plains areas are capable of supporting forest growth similar to that in the Pine Barrens. Inasmuch as the Plains owe their continued existence to repeated fires, it is obvious that effective fire protection is the first and most important step toward their rehabilitation.
Root Growth Of White Pine (Pinus Strobus L.), Clark Leavitt Stevens
Root Growth Of White Pine (Pinus Strobus L.), Clark Leavitt Stevens
Yale School of the Environment Bulletin Series
Periodic measurements were made throughout two growing seasons to determine the rate of growth in length of lateral roots of white pine, four to six years old, planted in open fields.....Wide variation between individual roots was observed in the amount of growth made annually.
Trenched Plots Under Forest Canopies, James W. Toumey, Raymond Kienholz
Trenched Plots Under Forest Canopies, James W. Toumey, Raymond Kienholz
Yale School of the Environment Bulletin Series
The relative importance of light and soil moisture in particular is better known than that of other environmental factors. We are coming to believe that the nature and condition of the reproduction and other surface vegetation beneath living canopies are not due to any single factor such as light or soil moisture, but to a complex of factors.
The Effect Of Soil Moisture On The Establishment Of Spruce Reproduction In British Columbia, Percy Munson Barr
The Effect Of Soil Moisture On The Establishment Of Spruce Reproduction In British Columbia, Percy Munson Barr
Yale School of the Environment Bulletin Series
Most of the field work has been conducted at the Aleza Lake Forest Experiment Station, in the valley of the Upper Fraser River, near the city of Prince George [British Columbia].
I. A series of twelve permanent plots (numbers 1 to 12) was established for the purpose of studying the occurrence of natural reproduction on various types of seed bed, under different densities of overwood and on northern and southern aspects. 2. A second series of four plots (numbers 17 to 20) was laid out in logged-off land for the purpose of studying the survival and growth of advance reproduction …
Some Aspects Of Light In The Forest, Amihud Grasovsky
Some Aspects Of Light In The Forest, Amihud Grasovsky
Yale School of the Environment Bulletin Series
In this present investigation an attempt is made to determine experimentally to what extent light controls the vegetation on the forest floor and, consequently, succession of the forest flora, and whether under natural canopies light can be looked upon as a limiting factor in plant survival.
The general conclusion reached is that the intensity and quality of the light reaching the forest floor are not the determining factors in accounting for the presence or absence of reproduction in the fully stocked forest where the investigation was made.
Trends And Silvicultural Significance Of Upland Forest Successions In Southern New England, Harold J. Lutz
Trends And Silvicultural Significance Of Upland Forest Successions In Southern New England, Harold J. Lutz
Yale School of the Environment Bulletin Series
The problems encountered in the silvicultural treatment of southern New England forests are many. They result largely from the extremely diverse and complex conditions under which the forest is developed. Due to the glaciated nature of the region the soil character changes radically within relatively short distances. With changes in soil from place to place come minor changes of forest composition. One of the chief reasons for the problems which the silviculturalist encounters in this region is the large number of species which make up the stands. There are approximately thirty commercially important forest trees in southern New England. The …
The Testing Of Coniferous Tree Seeds At The School Of Forestry, Yale University, 1906-1926, James W. Toumey, Clark L. Stevens
The Testing Of Coniferous Tree Seeds At The School Of Forestry, Yale University, 1906-1926, James W. Toumey, Clark L. Stevens
Yale School of the Environment Bulletin Series
Quality in forest tree seed centers in (a) origin; (b) genuineness; (c) purity; and (d) viability. The purchaser should insist on knowing the origin of the seed and the locality where it was collected.
Without seed testing establishments for investigating forest tree seeds by standardized methods under an established technique, nurserymen and foresters will continue to sow seed beds and undertake direct seeding without an adequate knowledge of the origin, genuineness, purity, and viability of the seeds used.
Factors Controlling Germination And Early Survival In Oaks, Clarence F. Korstian
Factors Controlling Germination And Early Survival In Oaks, Clarence F. Korstian
Yale School of the Environment Bulletin Series
There is little information available upon the seed and seedling characteristics of the American oaks. Among the fundamental problems in American silviculture, those which relate to seed efficiency are especially important. The future productiveness of the hardwood forests in which chestnut has been an important·element rests largely upon seed and sprout efficiency. Seed efficiency is governed by (I) seed production, (2) seed distribution, and (3) the factors affecting the reproductive value of the seed, such as viability, storage of seed in the litter of the forest floor, and destruction by insects and rodents.
Factors Determining Natural Reproduction Of Longleaf Pine On Cut-Over Lands In Lasalle Parish, Louisiana, Herman H. Chapman
Factors Determining Natural Reproduction Of Longleaf Pine On Cut-Over Lands In Lasalle Parish, Louisiana, Herman H. Chapman
Yale School of the Environment Bulletin Series
The original ' pine forests, of the southern states covered from 125 to 130 million acres of land, about two-thirds of which was Longleaf pine. Four-fifths of this area had been cut over by 1920, leaving about 230 million acres, one-half of which is Longleaf pine. Of the cut-over lands, 31 million acres have not restocked. The Longleaf pine has thus been the principal tree crop on about 85 million acres of land, of which 11% million acres remained' in 1920, giving a cut-over area of nearly 73 million acres, or 114,062 square miles. This area is nearly half the …
Soil Temperature As Influenced By Forest Cover, Tsi-Tung Li
Soil Temperature As Influenced By Forest Cover, Tsi-Tung Li
Yale School of the Environment Bulletin Series
The purpose of this investigation is to study the effect of the forest on soil temperature at definite depths, expressed in terms of daily maximum and daily minimum. By forest is meant not only the trees but the surface vegetation and litter as well. Effort was made to preserve the vegetation and litter from being disturbed over the period covered by the investigation.
Boxwoods, Samuel J. Record, George A. Garratt
Boxwoods, Samuel J. Record, George A. Garratt
Yale School of the Environment Bulletin Series
True boxwood, commonly called Turkish boxwood, is derived from a small group of plants, of which the common evergreen ·box of our gardens is the type. To this group the famous botanist Linnaeus gave the generic name of Buxis, the Latin for box tree. He called the best known member of it Buxis sempervirens, which is' but another form of Ovid's "buxus perpetuo virens," the evergreen box. For long this was considered the only species, though various forms and varieties came to be recognized, several of which have since been elevated by other botanists to specific rank.
Nursery Investigations With Special Reference To Damping-Off, J W. Toumey, T T. Li
Nursery Investigations With Special Reference To Damping-Off, J W. Toumey, T T. Li
Yale School of the Environment Bulletin Series
The object of this investigation is therefore fourfold: 1. To determine an effective means of control of damping-off in the School of Forestry Nursery. 2. To determine the effects of different soil sanitation agents on the germination and later growth of coniferous stock. 3. To determine the effects of different sanitation agents on the germination and growth of weeds. 4. To determine the effects of different sanitation agents on the physical characteristics of the soil.
Some Effects Of Cover Over Coniferous Seedbeds In Southern New England, James W. Toumey, Ernest J. Neethling
Some Effects Of Cover Over Coniferous Seedbeds In Southern New England, James W. Toumey, Ernest J. Neethling
Yale School of the Environment Bulletin Series
The object of the study as at first conceived was to secure experimental data under the climatic conditions of southern Connecticut: 1. On the effect of shade as compared with full light on the time required for germination, and on germination values in representative conifers, and on survival and growth during the first season. 2. On the effect of mulch as compared with exposed soil on the time required for germination, and on germination values in representative conifers, and on survival and growth during the first season.
Cocobolo, Samuel J. Record, George A. Garratt
Cocobolo, Samuel J. Record, George A. Garratt
Yale School of the Environment Bulletin Series
Cocobolo is a valuable timber of commerce that has been in use in this country, particularly for handles of cutlery, for more than fifty years. It is produced by certain species of Dalbergia indigenous to Central America and southwestern Mexico. The present commercial sources are Panama, Costa Rica, and Nicaragua.
Lignum-Vitae: A Study Of The Woods Of The Zygophyllaceae With Reference To The True Lignum-Vitae Of Commerce--Its Sources, Properties, Uses, And Substitutes, Samuel J. Record
Lignum-Vitae: A Study Of The Woods Of The Zygophyllaceae With Reference To The True Lignum-Vitae Of Commerce--Its Sources, Properties, Uses, And Substitutes, Samuel J. Record
Yale School of the Environment Bulletin Series
The true lignum-vitae of commerce belongs to the family Zygophyllaceae, of which only three genera, namely, Guaiacum, Porlieria, and Bulnesia, have representatives of tree size, and these are confined to the tropical and sub-tropical regions of the Western Hemisphere. Porlieria is of no commerical importance.
The Den: A Preliminary Report, With Map, Of A Tract Of Woodland Given To The School By Mr. And Mrs. Winthrop Perry., James W. Toumey, Ralph C. Hawley
The Den: A Preliminary Report, With Map, Of A Tract Of Woodland Given To The School By Mr. And Mrs. Winthrop Perry., James W. Toumey, Ralph C. Hawley
Yale School of the Environment Bulletin Series
In the autumn of 1918, through gift of Mr. and Mrs. Winthrop Perry, the School of Forestry came into possession of a number of closely connected parcels or woodland comprising over 1,300 acres in Farifield County Connecticut.
The purpose of the donors and conditions under which the gift was made are clearly stated....
The Keene Forest: A Preliminary Report, J. W. Toumey, Ralph C. Hawley
The Keene Forest: A Preliminary Report, J. W. Toumey, Ralph C. Hawley
Yale School of the Environment Bulletin Series
In 1913 the Yale School of Forestry came into possession of certain parcels of land located near Keene, New Hampshire. This land amounting to 629.4 acres was presented to the School as a nucleus for a school forest to be used for purposes of instruction and research. Subsequently in March, 1915, additional lots comprising 270.9 acres were purchased with funds contributed by the original donor. The present area totals 900.3 acres and is know as the "Keene Forest."