نتایج جستجو برای: oak forest
تعداد نتایج: 113572 فیلتر نتایج به سال:
Background and Purpose: Structure of crowns in forest stands is one of the main factors which determines growth and development of trees. Dynamic change occurs with the age of the stand due to silvicultural interventions or natural disturbances during which trees are removed from the stand. The aim of this article is to analyse the structure of the crown shape of pedunculate oak and common horn...
Information is lacking on ecosystem effects of understory burning in mesic mixed-oak (Quercus spp.) forests of the southern Appalachians. Native Americans used periodic fires in these forests for driving game and opening the forest. In April 1998, we conducted a lowto moderate-intensity fire in a cove–hardwood forest in the Nantahala National Forest, western North Carolina. In March 1998, befor...
Sediment cores from Carp Lake provide a pollen record of the last ca. 125,000 years that helps disclose vegetational and climatic conditions from the present day to the previous interglaciation (120–133 ka). The core also contained 15 tephra layers, which were characterised by electron-microprobe analysis of volcanic glass shards. Identified tephra include Mount St. Helens Ye, 3.69 ka; Mazama a...
The aim of this study was to investigate the effect of throughfall (TF) and litterflow (LF) on oak (Quercus castaneifolia C.A.Mey.) and their monthly changes in the mixed stands located in district one of Shastkolate forest, Golestan province. For this purpose, TF and LF samples were collected after each rainfall (RF) in a one-year period and their content of Na+, K+ and Ca2+ compared with the ...
BACKGROUND Coppicing was one of the most important forest management systems in Europe documented in prehistory as well as in the Middle Ages. However, coppicing was gradually abandoned by the mid-20(th) century, which has altered the ecosystem structure, diversity and function of coppice woods. METHODOLOGY/PRINCIPAL FINDINGS Our aim was to disentangle factors shaping the historical growth dy...
California’s Hardwood Resource: Seeds, Seedlings, and Sprouts of Three Important Forest-Zone Species
McDonald, Philip M.; Tappeiner, John C., II. 2002. California’s hardwood resource: seeds, seedlings, and sprouts of three important forest-zone species. Gen. Tech. Rep. PSW-GTR-185. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture; 39 p. Although California black oak, tanoak, and Pacific madrone are the principal hardwood species in the forest zone ...
Fire, as a natural ecological disturbance factor in forest, this study located in the Marivan region, Northern Zagros forest, and western Iranian state of Kurdistan. In each burned and unburned area 30 circle sample plot (1000 m2) were collected by randomized–systematic method in the 100×200 m net (in total 60 plots). In every sample plot the kind of species, number of tree, the heig...
PA1 01 Do biochemical and geochemical influences of acidic deposition affect dendroclimatic stability? PA2 Reconstruction of past climate variations: a challenge for the present and future PA2 10 Dendrochronological analysis of selected spruce stands in the Drahany highlands PA2 14 Studies with the Finnish over 7650-year pine chronology PA3 Tree rings and insects, diseases and anthropogenic fac...
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