scholarly journals Transformation to irregular structure of an upland conifer forest

1999 ◽  
Vol 75 (3) ◽  
pp. 407-412 ◽  
Author(s):  
E. R. Wilson ◽  
H. Whitney McIver ◽  
D. C. Malcolm
Keyword(s):  
Sitka Spruce ◽  
Douglas Fir ◽  
Conifer Forest ◽  
Forest Research ◽  
Research Areas ◽  
Key Words Transformation ◽  
Management Objectives ◽  
Irregular Structure ◽  
Silvicultural System

The Glentress Trial was established by M.L. Anderson in 1952 as a demonstration of transformation to irregular structure of an upland conifer forest in southern Scotland. The trial area (117 ha) is one of the longest continuously-studied forest research areas in Britain. The dominant tree species are Sitka spruce, European larch, Scots pine and Douglas-fir. The most important silvicultural system is group selection, with group size varying from 0.1 to 0.2 ha. Groups are restocked by planting or natural regeneration. Interim results point to the development of an irregular forest structure, although the transformation will not be complete until 2033. The trial demonstrates the value of continuous cover forests in meeting multiple forest management objectives, and is a resource of increasing importance for silviculture education and long-term research. Key words: transformation, irregular structure, uneven-aged management, Sitka spruce, Douglas-fir, long-term silviculture research

scholarly journals Die zukünftige Waldforschung an der WSL | The future of forest research at WSL

2002 ◽  
Vol 153 (8) ◽  
pp. 321-325
Author(s):  
Mario F. Broggi ◽  
Bernhard Oester
Keyword(s):  
Forest Ecosystems ◽  
Forest Health ◽  
Forest Research ◽  
Research Areas ◽  
Research Findings ◽  
Forest Use ◽  
The Many ◽  
The Right ◽  
Forest Plans

Forest research is going through a period of decisive change in terms of both structure and values as a result of economic and social developments. Researchers from the Department «Forest» at WSL have, therefore, been discussing potential challenges with other experts in order to be able to identify problems early and anticipate the consequences of global developments. We have been asking ourselves questions like: Are we doing the right thing? And are we doing it in the right way? We have drawn on these discussions in setting our longterm goals and core research areas for the next few years. The Department «Forest» plans to continue to focus mainly on ecological research but also to consider topics more from the points of view of economics and direct implementation. Steps in this direction have already been taken. The WSL Programme«Future-oriented Management of Forest Use» has been launched and the Section «Economics» has been strengthened with more people employed. The Section «Silvicultural Strategies» focuses on studying long-term forest development. It then uses these research findings to work out effective silvicultural strategies to steer the development of the forest. Thorough knowledge of the forest ecosystem and of the processes that take place within it is essential in order to answer the many questions raised. The Section «Forest Ecosystems and Ecological Risks» is investigating these processes and cause-effect relationships in forest ecosystems. It estimates the risks arising from changing environmental conditions. The Section«Soil Ecology» is concerned with long-term processes and changes taking place in the soil. It studies the influence of the increased deposition of acids, nitrogen compounds and inorganic pollutants, in particular heavy metals, on the soil and the associated risks to plants, soil-dwelling creatures and the groundwater. The Section «Forest and Environmental Protection» has become known as the centre for expertise on forest health in Switzerland. It makes recommendations and disseminates research findings and data to do with current issues in forest conservation. We are performing top research in these areas and are well known in international research circles, as the ETH-Council expects us to be. We intend in future to offer more support to those responsible for or interested in forests by providing applicable and future-oriented solutions to important and complex problems.

A silvicultural systems perspective on changing Canadian forestry practices

2005 ◽  
Vol 81 (1) ◽  
pp. 50-55 ◽  
Author(s):  
A. Groot ◽  
J -M. Lussier ◽  
A K Mitchell ◽  
D A MacIsaac
Keyword(s):  
Timber Harvesting ◽  
Long Term Effects ◽  
Forestry Practices ◽  
Management Objectives ◽  
Tree Retention ◽  
Silvicultural Practice ◽  
Structural Retention ◽  
Changing Practices ◽  
Silvicultural System

Canadian forestry practices are changing to meet evolving forest management objectives, and these changes are frequently accompanied by new terminology.We examine the interaction among changing objectives, changing practices, and terminology in three forest types across Canada. Altered silvicultural practices and systems can generally be described using traditional terminology, and applying new terminology may create confusion. The most notable developments in silvicultural practice involve timber harvests with greater levels of tree retention, and new terminology is being applied mainly to designate changed harvest patterns. Timber harvesting is a crucial silvicultural practice, but does not by itself constitute a silvicultural system. It is necessary to more thoroughly define long-term stand-level management objectives, and to delineate complete silvicultural systems that address these objectives. This will require better knowledge of the long-term effects of forestry practices, particularly those resulting in structurally complex stands. Key words: silvicultural systems, forestry practices, terminology, harvesting, Canada, structural retention

scholarly journals Growth Response of Bigcone Douglas Fir (Pseudotsuga macrocarpa) to Long-Term Ozone Exposure in Southern California

1995 ◽  
Vol 45 (1) ◽  
pp. 36-45 ◽  
Author(s):  
David L. Peterson ◽  
David G. Silsbee ◽  
Mark Poth ◽  
Michael J. Arbaugh ◽  
Frances E. Biles
Keyword(s):  
Southern California ◽  
Growth Response ◽  
Douglas Fir ◽  
Ozone Exposure

Heritability of height growth in 10-year-old Sitka spruce

1985 ◽  
Vol 27 (6) ◽  
pp. 729-734 ◽  
Author(s):  
Francis C. Yeh ◽  
Sven Rasmussen
Keyword(s):  
Sitka Spruce ◽  
Height Growth ◽  
Picea Sitchensis ◽  
Breeding Program ◽  
Progeny Test ◽  
Northwest Coast ◽  
Phenotypic Variance ◽  
Family Selection ◽  
Sources Of Variation

Ten-year height growth for Picea sitchensis (Bong.) Carr. was studied in a progeny test of 42 wind-pollinated families from seven stands on the northwest coast of Vancouver Island. Although stand and family-within-stand effects were significant sources of variation, 79% of the phenotypic variance in 10-year height was associated with differences among trees within family plots. Estimates of heritability ([Formula: see text], [Formula: see text], and [Formula: see text]) indicate that a combination of stand, family-within-stand, and progeny-within-family selection will be effective for a long-term breeding program to increase tree heights in Sitka spruce.Key words: Picea, heritability, quantitative.

scholarly journals Adjacency to a harvest trail increases drought resistance of interior Douglas-fir (Pseudotsuga menziesii var. glauca) in partially harvested stands in central British Columbia

2018 ◽  
Vol 48 (7) ◽  
pp. 809-820 ◽  
Author(s):  
Neil P. Thompson ◽  
Kathy J. Lewis ◽  
Lisa M. Poirier
Keyword(s):  
British Columbia ◽  
Drought Tolerance ◽  
Pseudotsuga Menziesii ◽  
Growth Rates ◽  
Habitat Management ◽  
Odocoileus Hemionus ◽  
Douglas Fir ◽  
Ring Analysis ◽  
The Relationship

Drought tolerance of trees may be affected by competition, but most studies quantifying the relationship do not consider the effect of stem clustering. Trees are often clustered in interior Douglas-fir (Pseudotsuga menziesii var. glauca (Mayr) Franco) forests near the grassland interface in central British Columbia due to past harvesting practices or habitat management for mule deer (Odocoileus hemionus hemionus (Rafinesque, 1817)). Climate change projections indicate continued increases in temperature, an outcome that would stress trees growing in dry environments. Trees placed in different states of competition by mechanical harvesting in the 1970s were sampled to provide a 40-year comparison of three levels of competition during 1–2 year droughts. Tree-ring analysis was used to assess the reduction in growth during drought years and resumption of growth in subsequent years. A clear separation of growth rates was evident between open-growing trees, trees on the edge of harvesting trails, and trees within the unharvested interior. Edge trees had intermediate growth rates but no differences were found in the long-term climate–growth relationship compared with open-growing trees. Both Edge and Open classes showed less relative growth reduction during droughts than Interior trees growing between harvest trails. Precipitation throughfall rates and competition for resources are likely driving short-term drought tolerance in combination with other factors.

scholarly journals Utikuma Region Study Area (URSA) – Part 1: Hydrogeological and ecohydrological studies (HEAD)

2016 ◽  
Vol 92 (01) ◽  
pp. 57-61 ◽  
Author(s):  
Kevin J. Devito ◽  
Carl Mendoza ◽  
Richard M. Petrone ◽  
Nick Kettridge ◽  
James M. Waddington
Keyword(s):  
Boreal Forest ◽  
Conceptual Understanding ◽  
Natural Disturbance ◽  
Spatially Explicit ◽  
Forest Research ◽  
Boreal Plains ◽  
Process Studies ◽  
Hydrogeological Studies ◽  
Western Boreal Forest

The Utikuma Region Study Area (URSA) was initiated to develop spatially explicit modelling tools to predict the cumulative impacts of land use and natural disturbance on the Boreal Plains (BP) ecozone of the Western Boreal Forest. Research comprised several multi-year projects, spanning wet and dry climate periods that combined intensive detailed process studies at seven watersheds with extensive long-term ecohydrological and hydrogeological studies conducted across a 60-km transect representing the range of glaciated landforms characteristic of the sub-humid boreal forest in Alberta. These studies have improved our conceptual understanding and capacity to numerically model how climate and geology influence water and energy flow, and the hydrologic linkages and natural variability of the key processes influencing BP ecosystems. Eco-hydrogeological frameworks have been developed for designing, conducting, interpreting, and extrapolating research results for watershed management and construction across the Boreal Plain ecozone.

scholarly journals Science of the Vatican Observatory since 2000

2020 ◽  
Vol 7 (2) ◽  
pp. 282-298
Author(s):  
Guy Consolmagno, S.J.
Keyword(s):  
Scientific Work ◽  
Advanced Technology ◽  
Research Programs ◽  
Research Areas ◽  
Stellar Astronomy ◽  
University Of Arizona ◽  
To Come ◽  
The Individual ◽  
The University

Five research areas have been the focus of the scientific work of the Specola Vaticana (Vatican Observatory) over the past twenty years: planetary sciences, stellar astronomy, extragalactic astronomy, cosmology, and the development of the Vatican Advanced Technology Telescope (vatt). The choice of research program is left to the individual astronomers, all of whom work closely with lay collaborators around the world. Notable, especially in connection with the vatt, is the close coordination of the Specola with the Steward Observatory of the University of Arizona. One unique strength of the Specola is its independence from short-term funding requirements. As a result of its stable funding, Specola astronomers can engage in long-term research programs such as surveys of meteorite properties, exoplanets, stellar clusters, and galaxy clusters, which may take ten or more years to come to fruition. In this way the Specola complements the large research programs of contemporary astronomy.

Long‐term fauna and flora records of the experimental forests of the Forest Research Station of Hokkaido University, Japan

2019 ◽  
Vol 34 (3) ◽  
pp. 349-349
Author(s):  
Chisato Terada ◽  
TaeOh Kwon ◽  
Nobuko Kazahari ◽  
Osamu Kishida ◽  
Shunsuke Utsumi
Keyword(s):  
Research Station ◽  
Forest Research
Sign in / Sign up

Export Citation Format

Share Document