Assessing Change in Canada's Forest Resource 1977-1981

1986 ◽  
Vol 62 (5) ◽  
pp. 423-428
Author(s):  
T. G. Honer
Keyword(s):  
Data Base ◽  
Tree Species ◽  
Forest Resource ◽  
Forest Land ◽  
Land Area ◽  
Timber Volume ◽  
Annual Increase ◽  
Standing Timber ◽  
Year 2000 ◽  
Forest Renewal

The statistics on Canada's forest resource for the period 1977–1981 show that annual accruals to timber volume are about 338 million m3 and annual withdrawals total about 287 million m3. This results in an average annual increase in standing timber volume of about 51 million m3 or 0.2%. In terms of land area, about 1.77 million ha were added annually to the stocked productive forest land base whereas annual withdrawals comprised 2.22 million ha. As a result about 452 000 ha of forest land go out of production annually as being not satisfactorily restocked to commercial tree species. Continued erosion of the land base for forestry could result in approximately 14% or 31 million ha of forest land being out of production by the year 2000. Since 1981, federal-provincial agreements to renew the forest have totalled $1.057 billion and emphasis is on planting the backlog of lands that are not satisfactorily restocked. The forestry data base needs improvement and recommendations are presented that could enhance existing classifications and demonstrate the increased productivity attributable to forest renewal funding.

scholarly journals Production of Douglas-Fir in the Czech Republic based on national forest inventory data

2013 ◽  
Vol 59 (No. 10) ◽  
pp. 398-404 ◽  
Author(s):  
V. Podrázský ◽  
R. Čermák ◽  
D. Zahradník ◽  
J. Kouba
Keyword(s):  
Czech Republic ◽  
Tree Species ◽  
Forest Inventory ◽  
National Forest Inventory ◽  
Douglas Fir ◽  
National Forest ◽  
Northern Red Oak ◽  
Forest Land ◽  
Land Area ◽  
The Czech Republic

This article summarizes basic estimates of productivity and trend analysis of one of the principal introduced forest tree species in the Czech Republic, i.e. Douglas-fir (Pseudotsuga menziesii [Mirbel] Franco). As a comparison, we also examine grand fir (Abies grandis [D. Don] Lindl), northern red oak (Quercus rubra L. syn. Quercus borealis Michx.) and black locust (Robinia pseudoacacia L). This paper presents estimates of forest land area, standing volume, annual and total increments, distribution of age classes, average ages and site indexes for the period 1979–2010. All data were obtained from the national forest inventory of the Czech Republic. Korf’s growth function was used for the assessment of current and mean annual increments (CAI, MAI) of Douglas-fir compared to other tree species. Our results suggest a decline in the annual area afforested by Douglas-fir, as influenced by the State administration management choices, a low rate of an increase in the forest land area, increasing average age of the forests. On the other hand, we observed a dramatic increase in the standing volume as well as high annual increments in volume. Douglas-fir is the most productive major tree species in the Czech Republic and there is a great potential to expand its use throughout the country.

The Use of Aircraft in Forest Inventories in Canada

1965 ◽  
Vol 69 (660) ◽  
pp. 853-855
Author(s):  
L. Sayn-Wittgenstein
Keyword(s):  
Tree Species ◽  
Forest Land ◽  
Timber Volume ◽  
Tree Form ◽  
Size Classes ◽  
Forest Inventories ◽  
Tree Quality

The task of completing an inventory of Canada's forests is an immense one and it is not surprising that aircraft have been used in Canadian forest inventories ever since they became available in reasonable numbers. As will be seen, the nature of the forest to be surveyed and the characteristics of the organisations engaged in forest inventories provide the strongest argument in favour of aircraft.Canadian forest inventories, like all forest inventories, are concerned with estimating the area of forest land and the description of the timber on that area. More specifically, one usually seeks an estimate of timber volume by tree species and size classes and information on various characteristics of tree quality, such as extent of decay and tree form.

scholarly journals Area-Wide Analysis of Hardwood Defoliator Effects on Tree Conditions in the Allegheny Plateau

2004 ◽  
Vol 21 (1) ◽  
pp. 31-39 ◽  
Author(s):  
Randall S. Morin ◽  
Andrew M. Liebhold ◽  
Kurt W. Gottschalk
Keyword(s):  
Tree Mortality ◽  
Forest Health ◽  
National Forest ◽  
Forest Land ◽  
Land Area ◽  
Usda Forest Service ◽  
Forest Inventory And Analysis ◽  
Allegheny Plateau ◽  
Using Data ◽  
Crown Dieback

Abstract The effects of defoliation caused by three foliage feeding insects, the gypsy moth (Lymantria dispar), the cherry scallopshell moth (Hydria prunivorata), and the elm spanworm (Ennomos subsignarius), on tree mortality and crown conditions were evaluated using data collected from 1984 to 1999 in the Allegheny National Forest located in northwestern Pennsylvania. While previous studies have focused on the effects of defoliation on trees in individual stands, this study differed in that it used exhaustive maps of defoliation and an areawide network of plots to assess these effects. A geographic information system was used to map the coincidence of USDA Forest Service Forest Inventory and Analysis and Forest Health Monitoring plot locations with defoliation polygons derived from aerial surveys to calculate cumulative years of defoliation for each pest. Over 85% of the Allegheny National Forest land area was defoliated at least once during the 16-year period from 1984 to 1999. Frequency of defoliation by specific defoliator species was closely associated with the dominance of their primary hosts in stands. Frequency of defoliation was often associated with crown dieback and mortality, but these relationships were not detectable in all species. These results suggest that when impacts are averaged over large areas (such as in this study) effects of defoliation are likely to be considerably less severe than when measured in selected stands (as is the approach taken in most previous impact studies).

African Population Growth and Politics

1978 ◽  
Vol 8 (4) ◽  
pp. 14-19
Author(s):  
Yohannis Abate
Keyword(s):  
Population Growth ◽  
Industrial Revolution ◽  
Slave Trade ◽  
Small Population ◽  
African Population ◽  
World Population ◽  
Land Area ◽  
Factors Associated ◽  
The World ◽  
Year 2000

The population of Africa in 1977 is estimated to be 423 million, which is about 10.3 percent of the world population. For a quarter of the world’s land area, that is a small population.Africa’s share of world population declined between 1650 and 1920, partly because the population of Europe and the Americas was increasing gradually through factors associated with the Industrial Revolution, and partly because of the ravages of the slave trade and the European colonial pacification measures. Since the 1920s, however, Africa’s population has been growing fast, and its share of world population could reach 13 percent by the year 2000.

scholarly journals National mapping and estimation of forest area by dominant tree species using Sentinel-2 data

2020 ◽  
Author(s):  
Johannes Breidenbach ◽  
Lars T. Waser ◽  
Misganu Debella-Gilo ◽  
Johannes Schumacher ◽  
Johannes Rahlf ◽  
...  
Keyword(s):  
Tree Species ◽  
Deciduous Forest ◽  
National Level ◽  
National Forest Inventory ◽  
Forest Area ◽  
Forest Resource ◽  
Species Specific ◽  
Minimum Numbers ◽  
Generate Model ◽  
Sentinel 2

Nation-wide Sentinel-2 mosaics were used with National Forest Inventory (NFI) plot data for modelling and subsequent mapping of spruce-, pine- and deciduous-dominated forest in Norway at a 16m×16m resolution. The accuracies of the best model ranged between 74% for spruce and 87% for deciduous forest. An overall accuracy of 90% was found on stand level using independent data from more than 42,000 stands. Errors mostly resulting from a forest mask reduced the model accuracies by approximately 10%. The produced map was subsequently used to generate model-assisted (MA) and post stratified (PS) estimates of species-specific forest area. At the national level, efficiencies of the estimates increased by 20% to 50% for MA and up to 90% for PS. Greater minimum numbers of observations constrained the use of PS. For MA estimates of municipalities, efficiencies improved by up to a factor of 8 but were sometimes also less than 1. PS estimates were always equally as or more precise than direct and MA estimates but were applicable in fewer municipalities. The tree species prediction map is part of the Norwegian forest resource map and is used, among others, to improve maps of other variables of interest such as timber volume and biomass.

scholarly journals RELAÇÃO ETNOBOTÂNICA DOS PROPRIETÁRIOS RURAIS DO MUNICÍPIO DE URUPEMA, SC, COM RECURSOS FLORESTAIS

FLORESTA ◽  
2014 ◽  
Vol 44 (4) ◽  
pp. 725
Author(s):  
Renata Diane Menegatti ◽  
Pedro Higuchi ◽  
Ana Carolina Da Silva ◽  
João Fert-Neto ◽  
Jean Correia ◽  
...  
Keyword(s):  
Tree Species ◽  
Forest Resources ◽  
Native Forest ◽  
Araucaria Angustifolia ◽  
Forest Resource ◽  
Natural Forests ◽  
Fidelity Level ◽  
Araucaria Forest ◽  
Resources Exploitation

O presente estudo teve como objetivo caracterizar a relação etnobotânica de proprietários rurais do município de Urupema, SC, com recursos florestais. Para isso, foram realizadas entrevistas, em cada uma das 35 propriedades amostradas, sobre as principais fontes de renda e sobre as principais espécies florestais utilizadas. O uso das espécies foi analisado por meio do Nível de Fidelidade (NF) e da Porcentagem de Concordância quanto aos Usos Principais (CUP). As fontes de renda relatadas com maior frequência foram a pecuária, a fruticultura e a aposentadoria. Os recursos florestais são utilizados, principalmente, para fins de alimentação e energético. Todas as espécies citadas apresentaram elevado NF (≥ 97%) e a Araucaria angustifolia (Bertol.) Kuntze é a espécie de maior valor de CUP (97,06%), por ser utilizada por quase a totalidade dos entrevistados (34), sempre para os mesmos fins. Os resultados demonstraram que a maioria dos entrevistados (83%) não obtém renda das florestas naturais, mesmo com quase metade (47%) tendo citado que seria possível sustentar a família por meio da exploração dos recursos florestais nativos. Dentre os recursos florestais explorados, destacou-se a extração de pinhão como fonte de renda.Palavras-chave: Floresta com Araucária; Planalto Catarinense; etnobotânica; produtores rurais. AbstractEthnobotanical connections of rural landowners in the municipality of Urupema, SC, with forest resources. The present research aimed to characterize the ethnobotanical connections of rural landowners in the municipality of Urupema, SC, with their use of forest resource. In order to do that, we conducted interviews, in each of the 35 surveyed properties, focusing the main source of income as well as the main used tree species. The species usages were analyzed by the Fidelity Level (NF) and Percentage of Main Use Concordance (CUP). The most frequent sources of income were livestock, fruit culture and retirement. The forest resources are mainly used as food and energy. All cited species revealed elevated values of NF (≥97%), and the more elevated value of CUP was observed for Araucaria angustifolia (Bertol.) Kuntze (97,06%), as such species had been reported by almost the totality of farmers, always for the same purpose. The results revealed that most of the interviewees (83%) do not get income from natural forests, even with almost half (47%) of them considering that it would be possible to sustain their family by native forest resources exploitation. Among the exploited forest resources, the extraction of pine nuts stood out as income source.Keywords: Araucaria Forest; Planalto Catarinense; forest resource usages; ethnobotany, farmers.

scholarly journals Analysis of standing timber sales based on overall coniferous/broadleaved tree species ratio

2016 ◽  
Vol 61 (No. 3) ◽  
pp. 106-111
Author(s):  
S. Slanina ◽  
P. Natov ◽  
J. Dvořák ◽  
B. Gabrielová
Keyword(s):  
Tree Species ◽  
Timber Sales ◽  
Broadleaved Tree Species ◽  
Broadleaved Tree ◽  
Standing Timber

scholarly journals Contribution to the knowledge of woods preferences of European beaver (Castor fiber L. 1758) in bank vegetation on non-forest land in the forest district Soutok (Czech Republic)

2008 ◽  
Vol 56 (4) ◽  
pp. 289-294 ◽  
Author(s):  
Jakub Urban ◽  
Josef Suchomel ◽  
Jan Dvořák
Keyword(s):  
Czech Republic ◽  
Tree Species ◽  
Forest Land ◽  
Individual Tree ◽  
European Beaver ◽  
Good Ability ◽  
Ability To Regenerate ◽  
Production Forests ◽  
Preferred Species ◽  
Forest District

From 2003 to 2005, this work studied the preference of tree species on non-forest land in the forest district Soutok (Southern Moravia, Czech Republic) in order to evaluate the suitability of the area for the development and the its importance in relation to the decrease of damage in neighbouring production forests. The diet included the total of 14 tree species with diameter interval reaching from 1–10 cm to 191–200 cm. The most preferred species was Common Ash (Fraxinus excelsior) (40.5 %) with the diameter 1–10 cm and willow (Salix spp.) (31.7 %) with the diameter 11–20 cm – both species with good ability to regenerate. Activities of European beaver negatively influenced the population of European white elm (Ulmus laevis), which belongs to the endangered species. Significant is the low ratio of poplars Populus spp. (7.9 %) caused by the forest management. Maintaining the suitable tree composition and a sufficiently high percentage of individual tree species – in favour of willows and poplars – can result in the needed decrease of stress caused by the population of beaver on the adjacent forest stands and in the decrease of possible damage.

scholarly journals Influence Factors in Land Use of Wan Abdul Rachman Forest Park

2018 ◽  
Vol 6 (2) ◽  
pp. 60
Author(s):  
Gita Bahana Simarmata ◽  
Rommy Qurniati ◽  
Hari Kaskoyo
Keyword(s):  
Land Use ◽  
Plant Species ◽  
Influence Factors ◽  
Multiple Linear Regressions ◽  
Forest Land ◽  
Land Area ◽  
Land Utilization ◽  
Forest Park ◽  
Linear Regressions ◽  
Number Of Plant Species

Forest land use is an activity which is committed by the community near the forest to fulfill the needs of their life. This research intended to determine factors that influence land utilization in Wan Abdul Rachman Forest Park. Utilization of forest land was assumed as the number of plant species that planted in forest land. The analysis of this research used multiple linear regressions to test factors that influence the number of plant species. This research showed that the number of plant species was influenced by duration of farming and land area size. It was revaled that longer duration of farming and larger community’s land would increase the number of plant species that has economic values.Keywords: land area, number of plant species, duration of farming, utilization of forest land.

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