| УДК |
Аннотация: This book deals with topography, drainage, soils, and climatic features of the country. This book is for students, foresters
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Сводный каталог книг
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Найдено документов в текущей БД: 9
634.9
B 82
B 82
Forest physiography
[Текст] : physiography of the United States and principles of soils in relation to forestry / I. Bowman. - New York ; London : John Wiley and Sons, 1911%. - 730 с. : ill. - Библиогр: . - 2.00 р.
Аннотация: This book deals with topography, drainage, soils, and climatic features of the country. This book is for students, foresters
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Аннотация: This book deals with topography, drainage, soils, and climatic features of the country. This book is for students, foresters
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06
S92
S92
Impacts of forest drainage on flow regime
[Text] : научное издание / L. Lundin. - Uppsala : The Swedish University of Agricultural Sciences, College of Forestry, 1994. - 22 p. : рис., табл. - (Studia Forestalia Suecica, ISSN 0039-3150 ; № 192). - eng. - Библиогр.: с. 21-22. - ISBN 91-576-4872-7 : 1300.00 р.
Аннотация: High floods in watercourses are of great interest, because of the potential hazards they pose to people and low-lying land near rivers. In many parts of the world, inundations are common and in northwest Europe there are high discharges almost every year, occasionally with serious consequences. In Sweden, such a major flood occurred in 1985, causing a damburst. Land use in the area was mainly forestry, and fairly extensive clear-felling and drainage were believed to have amplified high discharges following heavy rain. This led to investigation of the hydrological consequences of this forestry activities. Drainage was carried out both as new drainage of virgin peatlands, and as drainage of moist and wet mineral soils, i.e. remedial drainage of clear-felled areas. The investigations were made on small catchments and utiliesed the calibration period and control basin technique, using lenear regression ralations. Drainage of clear-felled areas partly led to reduced peak flows. A high grounwater level was an important prerequisite for increased discharges.
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| УДК |
Аннотация: High floods in watercourses are of great interest, because of the potential hazards they pose to people and low-lying land near rivers. In many parts of the world, inundations are common and in northwest Europe there are high discharges almost every year, occasionally with serious consequences. In Sweden, such a major flood occurred in 1985, causing a damburst. Land use in the area was mainly forestry, and fairly extensive clear-felling and drainage were believed to have amplified high discharges following heavy rain. This led to investigation of the hydrological consequences of this forestry activities. Drainage was carried out both as new drainage of virgin peatlands, and as drainage of moist and wet mineral soils, i.e. remedial drainage of clear-felled areas. The investigations were made on small catchments and utiliesed the calibration period and control basin technique, using lenear regression ralations. Drainage of clear-felled areas partly led to reduced peak flows. A high grounwater level was an important prerequisite for increased discharges.
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06
F54
F54
Acta Forestalia Fennica. 71
[Text] : publication of the Society of Forestry in Finnland. - Helsinki : Finska Forstsamfundet, 1961. - 249 с. : рис., табл. - fin. - 1.00 р.
Аннотация: The publication deals with allowable cut and its calculation; structure and development of pine stands; possibility of calculating results; volume and increment calculation; mensurational density of a stand; influence of forest drainage on growth and removal
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| УДК |
Аннотация: The publication deals with allowable cut and its calculation; structure and development of pine stands; possibility of calculating results; volume and increment calculation; mensurational density of a stand; influence of forest drainage on growth and removal
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06
F54
F54
Acta Forestalia Fennica. 76
[Text] : publication of the Society of Forestry in Finnland. - Helsinki : Finska Forstsamfundet, 1964. - 202 с. : рис., табл. - fin. - eng. - Библиогр. в конце ст. - 1.00 р.
Кл.слова (ненормированные):
variation -- investigation results -- trees and shrubs -- drainage degree -- temperature conditions -- rainfall
Аннотация: The book deals with seasonal variation in the sawmill industry in Finland; ornamental trees and shrubs; the effect of drainage degree on temperature conditions of peatland; ground water table fluctuations for measuring evapotranspiration; analysis of two alternative methods for National Forest Inventories in the Northern Europe; effect of natural subirrigation on the uptake of nutrients by forest plantations; on the distribution of rainfall in the pinestands.
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| УДК |
Кл.слова (ненормированные):
variation -- investigation results -- trees and shrubs -- drainage degree -- temperature conditions -- rainfall
Аннотация: The book deals with seasonal variation in the sawmill industry in Finland; ornamental trees and shrubs; the effect of drainage degree on temperature conditions of peatland; ground water table fluctuations for measuring evapotranspiration; analysis of two alternative methods for National Forest Inventories in the Northern Europe; effect of natural subirrigation on the uptake of nutrients by forest plantations; on the distribution of rainfall in the pinestands.
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526.8
R48
R48
The structural significance of lineaments in the Eastern Monsech Area, Province of Lerida, Spain
[Text] : научное издание / J.G.A. Renner. - Delft : International Training Centre, 1968. - 29 p. : рис., табл. - (Publications of the International Training Centre for Aerial Survey : series B ; n 45). - eng. - 0.35 р.
Аннотация: In the mapping of about 520 sq. km.of the Eastern Monsech Area in the Province of Lerida, Spain, a study of lineaments on photos covering the area was made. Lineaments are defined as the photo impression of joints and fractures with little or no displacement. Three types of lineaments were observed in this area: a) vegetation alignments, b) linear topographic features, c) linear drainage channels. Statistical analyses of the orientation and frequency of lineaments show that different geologists produce essentially the same lineament pattern of an area. The relationship of lineaments to joints and other fractures is also discussed.
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| УДК |
Аннотация: In the mapping of about 520 sq. km.of the Eastern Monsech Area in the Province of Lerida, Spain, a study of lineaments on photos covering the area was made. Lineaments are defined as the photo impression of joints and fractures with little or no displacement. Three types of lineaments were observed in this area: a) vegetation alignments, b) linear topographic features, c) linear drainage channels. Statistical analyses of the orientation and frequency of lineaments show that different geologists produce essentially the same lineament pattern of an area. The relationship of lineaments to joints and other fractures is also discussed.
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06
F54
F54
Suometsien puunkorjuu
[Text] = Forest harvesting on peatlands : научное издание / O. Eeronheimo. - Helsinki : Metsantutkimuslaitos, 1991. - 29 с. : рис., табл. - (Folia Forestalia ; № 779). - fin. - Библиогр.: с. 26-28. - ISSN 0015-5543. - ISBN 951-40-1173-2 : 1.50 р.
Аннотация: In Finland there are 9 mill. ha of peatlands classified as forestry land. About half of the peatlands have been drained for higher wood production. Of the total productive forest area - 20 mill. ha - peatland forests account for a quarter. The importance of peatland forests is increasing. The allowable cut in peatland forests has been increased from about 5 mill. m3 per annum to about 9 mill. m3/a through drainage and intensified silvicultural measures.
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| УДК |
Аннотация: In Finland there are 9 mill. ha of peatlands classified as forestry land. About half of the peatlands have been drained for higher wood production. Of the total productive forest area - 20 mill. ha - peatland forests account for a quarter. The importance of peatland forests is increasing. The allowable cut in peatland forests has been increased from about 5 mill. m3 per annum to about 9 mill. m3/a through drainage and intensified silvicultural measures.
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06
F54
F54
Kuivatstehon vaikutus turvemaan lampooloihin
[Text] = Effect of drainage on thermal conditions in peat soils : научное издание / J. Hytonen, K. Silfverberg. - Helsinki : Metsantutkimuslaitos, 1991. - 24 с. : рис., табл. - (Folia Forestalia ; № 780). - fin. - Библиогр.: с. 17-19. - ISSN 0015-5543. - ISBN 951-40-1178-3 : 2.00 р.
Кл.слова (ненормированные):
soil temperature -- drainage -- annual variation -- pine bog -- spruce swamp
Аннотация: The purpose of this study was to investigate the effects of drainage on thermal conditions in peat soils. In addition, the study includes an examination of inter- and intraannual temperature variation at various depths in peat. The study material was collected during the period 1965-1973 from pine and spruce mire experimental plots laid out in the Vilpuula and Kivalo research areas of the Finnish Forest Research Institute. The water level in the ditches had been regulated to be 10, 30, 50 and 70 cm below soil surface. Peat temperature at five depths (5,10, 15, 20 and 40 cm) and the ground water level were recorded 1-5 times per week during the growing period
Доп.точки доступа:
Silfverberg, K.
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| УДК |
Кл.слова (ненормированные):
soil temperature -- drainage -- annual variation -- pine bog -- spruce swamp
Аннотация: The purpose of this study was to investigate the effects of drainage on thermal conditions in peat soils. In addition, the study includes an examination of inter- and intraannual temperature variation at various depths in peat. The study material was collected during the period 1965-1973 from pine and spruce mire experimental plots laid out in the Vilpuula and Kivalo research areas of the Finnish Forest Research Institute. The water level in the ditches had been regulated to be 10, 30, 50 and 70 cm below soil surface. Peat temperature at five depths (5,10, 15, 20 and 40 cm) and the ground water level were recorded 1-5 times per week during the growing period
Доп.точки доступа:
Silfverberg, K.
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06
F54
F54
Lapimittajakauman ennustaminen Weibull-Jakaumalla Pohjois-Suomen manty-ja koivuvaltaisissa ojitusaluemetsikoissa
[Text] = The estimation of basal area-dbh distribution using Weibull-function for drained pine- and birch dominated and mixed peatland stands in north Finland : научное издание / H. Hokka, M.-E. Piiroinen, T. Penttila. - Helsinki : Metsantutkimuslaitos, 1991. - 22 с. : рис., табл. - (Folia Forestalia ; № 781). - fin. - Библиогр.: с. 20-21. - ISSN 0015-5543. - ISBN 951-40-1182-1 : 1.00 р.
Кл.слова (ненормированные):
diameter distribution -- Weibull-function -- peatland -- forest drainage
Аннотация: The three-parameter Weibull-function was fit by the maximum likelihood method to stem number- and basal area-dbh distributions in 329 drained peatland sample plot stands dominated by pine and birch. The material consists of a sub-sample of the plots of the 7th Finnish National Forest Inventory, altogether c. 600 permanent sample plots on peatlands in north Finland. Almost all stem number-dbh distribution were constructed.
Доп.точки доступа:
Piiroinen, M.-E.; Penttila, T.
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| УДК |
Кл.слова (ненормированные):
diameter distribution -- Weibull-function -- peatland -- forest drainage
Аннотация: The three-parameter Weibull-function was fit by the maximum likelihood method to stem number- and basal area-dbh distributions in 329 drained peatland sample plot stands dominated by pine and birch. The material consists of a sub-sample of the plots of the 7th Finnish National Forest Inventory, altogether c. 600 permanent sample plots on peatlands in north Finland. Almost all stem number-dbh distribution were constructed.
Доп.точки доступа:
Piiroinen, M.-E.; Penttila, T.
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06
F54
F54
Turpeen Kokoonpuristuvuus ja tiealueen kuivatuspainuman arviointi
[Text] = Compressibility of peat and estimation of drainage settlement of a road right-of-way : научное издание / M. Saarilahti. - Helsinki : Metsantutkimuslaitos, 1992. - 18 с. : рис., табл. - (Folia Forestalia ; № 788). - fin. - Библиогр.: с. 16-17. - ISSN 0015-5543. - ISBN 951-40-1198-8 : 1.00 р.
Аннотация: The settlement of peatland and road right-of-way can be estimated based on geotechnics. The modulus of compression and compression index measured by consolidation tests and the obtained values were tested against the observed settlement data from a literature survey. The regression coefficient between observed and calculated settlement was 0,84 when using only load factor (depth of ditches) as an independent variable and 0,92 when peat moisture content was included into the model. Compression index gave a little higher correlation coefficients, 0,92...0,94. It seems possible to develop simple settlement calculation methods for forest road planning and construction.
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| УДК |
Аннотация: The settlement of peatland and road right-of-way can be estimated based on geotechnics. The modulus of compression and compression index measured by consolidation tests and the obtained values were tested against the observed settlement data from a literature survey. The regression coefficient between observed and calculated settlement was 0,84 when using only load factor (depth of ditches) as an independent variable and 0,92 when peat moisture content was included into the model. Compression index gave a little higher correlation coefficients, 0,92...0,94. It seems possible to develop simple settlement calculation methods for forest road planning and construction.
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ИЛ-ИФ (1)
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