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Biegefestigkeit von Brettschichtholz aus Buche

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Book Series: Karlsruher Berichte zum Ingenieurholzbau ISSN: 1860093X ISBN: 3937300406 Year: Volume: 1 Pages: 141 p. DOI: 10.5445/KSP/1000001371 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:01

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Abstract

Im Hinblick auf den derzeitigen Umbau der deutschen Wälder und des damit verbundenen Zuwachses an Laubholz ist die Holzwirtschaft daran interessiert, Voraussetzungen für eine vermehrte Verwendung von Laubholz zu schaffen. Im Bereich des Bauwesens eröffnet Brettschichtholz aus Buche für tragende Zwecke wirtschaftlich interessante Anwendungen.Diese Forschungsarbeit beschreibt die Ermittlung von Vorschlägen für Rechenwerte der Festigkeit und Steifigkeit von Buchen-Brettschichtholz.Die Grundlage waren zahlreiche Festigkeitsprüfungen an 150 mm langen Brettabschnitten, die als Eingangsdaten für ein Rechenmodell dienten.Durch umfangreiche Biegeprüfungen von Brettschichtholzträgern aus Buche in Bauteilgröße konnte die Eignung des Rechenmodells zur Tragfähigkeitsvorhersage und damit auch zur Ableitung von Bemessungsvorschlägen nachgewiesen werden.Die Ergebnisse des Rechenmodells und der Prüfungen belegen eine hohe Biegefestigkeit von Brettschichtholz aus Buche. Durch maschinelle und visuelle Sortierung können Festigkeiten erreicht werden, die um bis zu 30 % über den Werten liegen, die durch das bisher verwendete Nadelholz erreichbar sind.

Causes and Consequences of Species Diversity in Forest Ecosystems

Authors: ---
ISBN: 9783039213092 / 9783039213108 Year: Pages: 272 DOI: 10.3390/books978-3-03921-310-8 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Geography
Added to DOAB on : 2019-08-28 11:21:27
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Abstract

What are the causes and consequences of species diversity in forested ecosystems, and how is this species diversity being affected by rapid environmental and climatic change, movement of invertebrate and vertebrate herbivores into new biogeographic regions, and expanding human populations and associated shifts in land-use patterns? In this book, we explore these questions for assemblages of forest trees, shrubs, and understory herbs at spatial scales ranging from small plots to large forest dynamics plots, at temporal scales ranging from seasons to centuries, in both temperate and tropical regions, and across rural-to-urban gradients in land use.

Keywords

Ericaceae --- variation partitioning --- climate --- species-area relationship --- mid-domain effect --- spatial patterns --- individual species-area relationship --- tropical evergreen mixed forest --- competition and facilitation --- Vietnam --- microarthropod --- diversity --- seasonal variations --- stand development --- biodiversity --- climate --- human footprint --- productivity --- topography --- USDA Forest Service --- herbaceous layer --- excess nitrogen --- canopy structure --- temperate forests --- Fagus sylvatica --- Pinus sylvestris --- Picea abies --- Pseudotsuga menziesii --- forest management --- tree species diversity --- forest conversion --- gamma diversity --- landscape scale --- Biodiversity Exploratories --- climate change --- temperature --- precipitation --- Hubbard Brook --- elevational shifts --- mountains --- species diversity --- structural complexity --- legacies --- wind damage --- uprooting --- trunk breakage --- understory plant communities --- natural disturbance-based silviculture --- forest management --- species conservation --- northern hardwood forests --- abundance --- Bray-Curtis --- codispersion analysis --- Smithsonian ForestGEO --- Shannon diversity --- Simpson diversity --- spatial analysis --- species richness --- windthrow --- tornado --- tree species --- disturbance severity --- tree regeneration --- salvaging --- salvage logging --- succession --- Climatic change --- species diversity --- potential habitats --- China --- Maxent --- Salicaceae --- herbaceous perennial species --- household respondents --- questionnaire survey --- species richness --- woody species --- temperate forests --- species richness --- assemblage lineage diversity --- phylogenetic diversity --- evolutionary diversity --- United States --- trees --- TILD

Physiological Responses to Abiotic and Biotic Stress in Forest Trees

Authors: ---
ISBN: 9783039215140 / 9783039215157 Year: Pages: 294 DOI: 10.3390/books978-3-03921-515-7 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Environmental Engineering
Added to DOAB on : 2019-12-09 11:49:15
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Abstract

As sessile organisms, plants have to cope with a multitude of natural and anthropogenic forms of stress in their environment. Due to their longevity, this is of particular significance for trees. As a consequence, trees develop an orchestra of resilience and resistance mechanisms to biotic and abiotic stresses in order to support their growth and development in a constantly changing atmospheric and pedospheric environment. The objective of this Special Issue of Forests is to summarize state-of-art knowledge and report the current progress on the processes that determine the resilience and resistance of trees from different zonobiomes as well as all forms of biotic and abiotic stress from the molecular to the whole tree level.

Keywords

drought --- mid-term --- non-structural carbohydrate --- soluble sugar --- starch --- Pinus massoniana --- salinity --- Carpinus betulus --- morphological indices --- gas exchange --- osmotic adjustment substances --- antioxidant enzyme activity --- ion relationships --- Populus simonii Carr. (poplar) --- intrinsic water-use efficiency --- tree rings --- basal area increment --- long-term drought --- hydrophilic polymers --- Stockosorb --- Luquasorb --- Konjac glucomannan --- photosynthesis --- ion relation --- Fagus sylvatica L. --- Abies alba Mill. --- N nutrition --- mixed stands --- pure stands --- soil N --- water relations --- 24-epiBL application --- salt stress --- ion contents --- chloroplast ultrastructure --- photosynthesis --- Robinia pseudoacacia L. --- elevation gradient --- forest type --- growth --- leaf properties --- Pinus koraiensis Sieb. et Zucc. --- Heterobasidion parviporum --- Heterobasidion annosum --- Norway spruce --- disturbance --- water availability --- pathogen --- infection --- Carpinus turczaninowii --- salinity treatments --- ecophysiology --- photosynthetic responses --- organic osmolytes --- ion homeostasis --- antioxidant enzymes --- glutaredoxin --- subcellular localization --- expression --- tapping panel dryness --- defense response --- rubber tree --- Ca2+ signal --- drought stress --- living cell --- Moso Bamboo (Phyllostachys edulis) --- plasma membrane Ca2+ channels --- signal network --- Aleppo pine --- Greece --- photosynthesis --- water potential --- ?13C --- sap flow --- canopy conductance --- climate --- molecular cloning --- functional analysis --- TCP --- DELLA --- GA-signaling pathway --- Fraxinus mandshurica Rupr. --- wood formation --- abiotic stress --- nutrition --- gene regulation --- tree --- bamboo forest --- cold stress --- physiological response --- silicon fertilization --- plant tolerance --- reactive oxygen species --- antioxidant activity --- proline --- Populus euphratica --- salt stress --- salicylic acid --- malondialdehyde --- differentially expressed genes --- n/a

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