Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Cedar mountains

Even that kind of information is not available for forest species. Other than chronic injury to white pine (associated with ozone, sulfur dioxide, and their mixtures), no clearly defined examples of chronic injury from ozone have been reported for eastern forests, and no information is available on PAN. It is of interest that both Virginia and jack pine appear more sensitive than white pine to acute ozone exposures, but chronic symptoms have not been observed in either species. The relationship between oxidant dose and injury in the San Bernardino Mountains area suggests that ponderosa pine is moderately to severely injured in areas that receive oxidant at above 0.08 ppm for 12-13 h each day (Chapter 12). Ponderosa pine seems to be the most sensitive western pine, but in some areas Jeffrey pine is about as sensitive. White fir, incense cedar, and sugar pine all appear more tolerant, even to the high oxidant concentrations in the San Bernardino Mountains. PAN may play some role in the chronic responses noted in the western forest species, particularly by broadleaf deciduous trees and some shrubs. [Pg.514]

California black oak and white fir and less often on incense cedar in the San Bernardino Mountains. No direct effects of oxidants have been noted on the mistletoe plant itself under field conditions. The true mistletoe obtains mainly water from its host and would be indirectly affected by debilitation of die host tree. The dwarf mistletoes Arceuthobium spp.) are common on ponderosa, Jeffry, and sugar pines in the San Bernardino National Forest. They depend on their host for both water and carbohydrates. Heavily infected or broomed" branches on ponderosa or Jeffrey pines severely injured by ozone often have more annual needle whorls retained than do uninfected branches on the remainder of the tree. The needles are also greener. It can be hypothesized that the infected branch is a carbohydrate sink where a pooling of carbohydrates occurs higher carbohydrate concentrations may be instrumental in either preventing or helping to repair ozone injury to needles on the broomed branches. In the long term, stresses from mistletoe and ozone are probably additive and hasten tree death. [Pg.634]

Lake and Mountain Lake evaporative losses exceed precipitation in the west (Cedar and Mountain), but represent only about 60% of the precipitation falling in northern Wisconsin (Little Rock). Precipitation chemistry varies along the same gradient, with pH increasing from 4.6 in northern Wisconsin to 4.8 in northeastern Minnesota and 5.2 in western Minnesota. The corresponding values for wet sulfate deposition decrease from 15 kg/ha per... [Pg.42]

Mean sediment-accumulation rates except Cedar and Mountain, for which preindustrial rates are shown. Dating parameters for Little Rock were provided by seven cores. [Pg.45]

For Cedar and Mountain lakes, detailed sediment cores collected from the deeper regions of each basin showed increasing sedimentation rates up-core. Thus a slightly different approach was used to provide additional temporal detail from the coarsely sectioned cores. These subsequent cores were extruded into five intervals 5-20 cm long so that dates and sediment accumulation rates could be explicitly calculated for the deeper strata. [Pg.46]

Dating and Sediment Accumulation. Stratigraphic Patterns Lead-210 profiles from profundal cores from each study lake show conformable declines in unsupported activity to an asymptote of supported 210Pb typically below 40-60 cm deep (Figure 3). Supported activity, attained at shallower depths in Thrush (28 cm) and Kjostad (36 cm), indicates slower linear rates of sedimentation at these sites. The activity profiles for several lakes, most notably Thrush and Kjostad, are almost perfectly exponential and thus indicate nearly constant sediment accumulation rates. Others, such as Cedar and Mountain, show flat spots and kinks that probably represent shifts in sediment flux. [Pg.48]

Figure 2. Organic content of surface sediments from all cores arrayed by lake depth. Significant carbonate is present only in Cedar Lake and Mountain Lake... Figure 2. Organic content of surface sediments from all cores arrayed by lake depth. Significant carbonate is present only in Cedar Lake and Mountain Lake...
Spatial Variability. A summary of unsupported 210Pb burdens for both coarse- and fine-interval cores (Figure 5) shows fairly similar sedimentary conditions within some basins (e.g., Dunnigan and Mountain) and substantial variability in others (e.g., Kjostad, Cedar, and Meander). The least variable lakes are the smallest and shallowest this result is to be expected because sediment deposition patterns are least accentuated by wave and current action in small basins of uniform depth. Uniform sediment deposition in... [Pg.51]

Figure 6. Average sediment accumulation rates for cores from Dunnigan, Meander, Thrush, Kjostad, and Little Rock. Modern ( post-1980) and pre-industrial ( pre-1850) rates are shown for Cedar and Mountain. Figure 6. Average sediment accumulation rates for cores from Dunnigan, Meander, Thrush, Kjostad, and Little Rock. Modern ( post-1980) and pre-industrial ( pre-1850) rates are shown for Cedar and Mountain.
Under environmental conditions in the Stanislaus National Forest, in central California, which may or may not be comparable with those in the southern California mountains, long-term observations of seedling regeneration indicated ponderosa and sugar pines were favored by removal of the overstory, understory, and ground competition white fir was favored by a light overstory which prevented frost damage (18). In that study, incense cedar was selectively removed by cutworms (Noc-tuidae), which made it difficult to assess the comparative effect of the physical environment on survival. [Pg.122]

Pencils are made from a slat of wood with several grooves cut in it to hold the leads. A similar grooved slat is then placed on top and glued to form a sandwich from which individual pencils are cut, sanded smooth, and painted. Although many types of wood have been used over the years to make pencils, the current favorite is incense cedar from the Sierra Nevada Mountains of California. [Pg.586]

Volatile organic compounds are contributed to the atmosphere by many forms of plant life, by way of conifers such as cedar, pine, and eucalyptus, and aromatic plants such as lavender, mint and sage. The pine forests of New England and the eucalyptus forests of the Blue Mountains in Australia contribute large masses of terpenes to the air above them. Terpenes are plant products biosynthetically derived from isoprene and have a formula of the type (C5H8)n where n is based on the number of isoprene units in the compound (Eq. 2.1). [Pg.34]

In the plains, Cambisols place the most drainage areas. These soils occupy the hilly plains and low mountain belts up to the 500-700 m elevation, where they coincide with the Broadleaf and Coniferous-Broadleaf Forest ecosystem types. In the most continental parts the oak forests are dominant. For instance, at the slopes of the Sikhote-Alin range Cedar-Broadleaf Forest and in Korean peninsula, the Oak-Maple Forest ecosystems are predominant. In Japan Beech Forest ecosystems are the most abundant. Heavy precipitation rates during wet season (up to 1000-1200 mm with P PE equal to 1) favor the increasing base saturation in the Luvic Cambisols. These ecosystems are characterized by a moderate rate of organic matter turnover with mean values of Cb equal to 2.5 C, is 0.67 and Cbr is 1.7. Such moderate rates are favorable to soil acidification with deposition input of sulfur and nitrogen acid forming compounds (NIES, 1996, Bashkin and Park, 1998). This process can be especially enhanced in... [Pg.317]

Varshney, S., Goldblum, R.M., Kearney, C., Watanabe, M., and Midoro-Horiuti, T., Major mountain cedar allergen, Jun a 1, contains conformational as well as linear IgE epitopes. Mol. Immunol, 44, 2781-2785, 2007. [Pg.79]

Primarily, the distinction lies in the use of bioactive silicon (silatrane and silocane substances) as the aetive component (AC), and in natural Russian cosmetics Baikal collection medicinal plants -silicon-philes (nettle, horse-tail, fern, greater celandine, maral root etc.) as well as such truly Russian Siberian components as cedar, buckthorn, fir needles, birch oils fly-agaric, birch black mushroom, asp rind, berries and leaves of mountain ash bergenia, aconite, Rhodiola and maral roots are used. The composition of sila-cosmetics may be represented by ... [Pg.349]

The impacts of acidification reach well beyond the direct toxic effects of high hydrogen ion concentration on plants and animals. Decline in the quality and growth rates of forests due to acid rain is well documented in several regions of the world" [44]. For instance, in the Sichuan province (particularly in Omei Mountain) of China, 87% of the cedar trees are seriously affected by acidification. Scandinavian scientists in 1960s first observed reduction of fish in lakes affected by acidification. Even a moderate acidification (pH 6.0) of surface waters can kill crustacean species. At pH < 5.5 loss of economically important fish species such as salmon and trout is expected. Hardy species such as the... [Pg.51]

Ramirez DA. The natural history of mountain cedar pollinosis. Allerg Immunol (Paris) 2000 32(3) 86-91. [Pg.782]

A. grandis, Cedrus libani (Cedar of Lebanon), Tsuga heterophylla (Western hemlock), Pseudotsuga menziesii. Araucaria araucana (Monkey puzzle). Araucaria heterophylla (Norfolk Island pine), Podocarpus totara (Totara), Podocarpus lawrencei (Mountain plum pine), Cupressus macrocarpa (Monterey cypress), Picea sitchensis (Sitka spruce)... [Pg.4045]

Cedarwood oil Virginia is obtained by steam distillation of the wood (sawdust, shavings, and other lumber wastes) of/, virginiana, commonly known as red cedar, eastern red cedar, and savin, which is a tree up to about 33 m high growing in North America east of the Rocky Mountains. The tree has many cultivated varieties. This oil is primarily produced in the United States and is most commonly referred to as cedarwood oil or cedar oil it has a sweet pencil wood and balsamic odor. [Pg.163]


See other pages where Cedar mountains is mentioned: [Pg.272]    [Pg.253]    [Pg.254]    [Pg.272]    [Pg.253]    [Pg.254]    [Pg.119]    [Pg.402]    [Pg.41]    [Pg.43]    [Pg.48]    [Pg.48]    [Pg.50]    [Pg.51]    [Pg.53]    [Pg.55]    [Pg.56]    [Pg.57]    [Pg.58]    [Pg.60]    [Pg.105]    [Pg.112]    [Pg.122]    [Pg.26]    [Pg.234]    [Pg.313]    [Pg.56]    [Pg.227]    [Pg.72]    [Pg.3]   
See also in sourсe #XX -- [ Pg.253 ]




SEARCH



Cedar

Mountaineer

Mountaineering

Mountains

© 2024 chempedia.info