Silva Fennica
2242-4075
0037-5330
Phần Lan
Cơ quản chủ quản: Finnish Society of Forest Science , FINNISH SOC FOREST SCIENCE-NATURAL RESOURCES INST FINLAND
Lĩnh vực:
ForestryEcological Modeling
Phân tích ảnh hưởng
Thông tin về tạp chí
Silva Fennica publishes significant new knowledge on forest sciences. The scope covers research on forestry and forest ecosystems. Silva Fennica aims to increase understanding on forest ecosystems, and sustainable use and conservation of forest resources. Use of forest resources includes all aspects of forestry containing biomass-based and non-timber products, economic and social factors etc.
Các bài báo tiêu biểu
Elongation of Scots pine seedlings under blue light depletion The effect of blue light (400â500 nm) removal on the elongation of Scots pine (Pinus sylvetris L.) seedlings was investigated in a field experiment in Northern Finland during two growing seasons. The seedlings were grown in plexiglass chambers and ambient control plots. The blue wavelengths were removed from the light spectrum by using chambers made of orange plexiglass. The results of nearly daily measurements showed that the elongation of Scots pine seedlings was increased by the removal of blue light only at high latitudes.
Tập 39 Số 1
Predicting diameter growth in even-aged Scots pine stands with a spatial and non-spatial model.
Tập 23 Số 2
Objectives and motivations of small-scale forest owners; theoretical modelling and qualitative assessment Forest management changes with societal change, and it has been debated if economic development in society places material objectives in a less preferable position: it is assumed this is also the case as regards forest management. The aims of this study were to propose a theoretical model for empirical studies of objectives and motivations within this field and to depict motivations and objectives of small-scale forest owners in Sweden. Comparative literature studies were undertaken and qualitative methodology was used for the empirical studies. Firstly, to depict general trends among forest owners, interviews with professional foresters were conducted. Secondly, forest owners throughout Sweden were interviewed to compare the results of the interviews with the professional foresters on the motivations and objectives of small-scale forest owners. Within the literature, there were no consistent views on the subjective grounds for owning and managing small-scale forest estates. The proposed theoretical model originated from the cultural concept. Sets of interpretive and normative qualities were seen as underlying peopleâs actions, and such sets were related to basic values. The âobjectivesâ were clustered into groups creating four clusters i.e. âmotivationsâ. The four motivations depicted were: Conservation; Utilities; Amenities and Economic Efficiency. The empirical results highlighted that the objectives and motivations of forest-owners covered a broad field and a move towards conservation interests was indicated. The theoretical model presented here is suggested a suitable tool for both depicting the motivations and objectives of forest owners and for making future comparisons.
Tập 38 Số 2
Values and objectives of non-industrial private forest owners in Finland The purpose of the study was to create an empirical typology of non-industrial private forest owners based on forest values and long-term objectives of forest ownership, to identify these types by owner and holding characteristics, as well as to analyze silvicultural and harvesting behavior in these groups. The analysis was based on survey data on 245 forest owners in southeastern Finland. The results indicated that general forest values and long-term objectives of forest ownership are not strongly correlated. The results further suggested that the sole emphasis on economic benefits of forests does not lead to the most active silvicultural and harvesting behavior. Multiobjective owners, who underlined both monetary and amenity benefits of their forest property, were the most active in their silvicultural and cutting behavior. Non-timber objectives seemed not to exclude wood production: a group called recreationists harvested slightly less than other owners. Recreationists were willing to invest in forestry but were selective with respect to management practices. The results can be used in planning and implementation of public forest policy such as allocation of the resources of forestry extension services. Forest industries should also benefit from a knowledge of the objectives of roundwood sellers.
Tập 32 Số 1
Dynamic interactions between forest structure and fire behavior in boreal ecosystems This paper reviews and synthesizes literature on fire as a disturbance factor in boreal forests. Spatial and temporal variation in the biophysical environment, specifically, vegetative structure, terrain, and weather lead to variations in fire behavior. Changes in slope, aspect, elevation, and soil affect site energy and water budgets and the potential plant community. These terrain features also have a major influence on fire-caused disturbance through their role in determining moisture conditions and flammability of fuels on hourly, seasonal, and successional time-scales. On fine time scales (minutes to hours), changes in weather, specifically wind and relative humidity, significantly affect a fireâs intensity and aboveground effects. Normal seasonal changes in dryness and periodic drought influence fire intensity and severity principally by affecting the depth of burn and belowground effects. On decades-long time scales changes in vegetative structure affect the mass of fuel available for burning and therefore the potential energy that can be released during a fire. The severity of fire varies in time and space depending not only on the biophysical environment, but also on the location on the fireâs perimeter (head vs. flank vs. rear). Spatial and temporal variation in severity within a fire can have long-lasting impacts on the structure and species composition of post-fire communities and the potential for future disturbances. Characteristic temperature histories of ground, surface, and crown fires are used to illustrate variations in fire severity. A soil-heating model is used to illustrate the impact of varying depth of burn on the depth at which various fire effects occur in the soil profile. A conceptual model is presented for the effects of fire severity on fire-plant regeneration interactions. The conceptual model can be used by restoration ecologists to evaluate the differential effects of controlled or prescribed fires and wildfires and to plan and implement fire treatments to conserve biodiversity.
Tập 36 Số 1