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Element shrub

Savannas are defined as tropical herbaceous ecosystems in which a more or less continuous grass cover formed mainly by C4 grass species represents the dominant ecological element shrubs or trees may be present or not, but they never form a closed canopy (Huber and Riina, 1997). The reference to C4 grasses indicates that savannas are typically lowland or upland vegetation types (c.0-1500 m a.s.L), thus differing ecologically and floristically from tropical... [Pg.112]

The tundra zone and corresponding tundra ecosystems occupy the northernmost strip of the continental area of Eurasia and North America bathed by the seas of the Arctic basin. The climate conditions of the tundra zone provide for a higher productivity of ecosystems and higher activity of biogeochemical cycles of various elements as compared with the Arctic ecosystems. The mosses, lichens, and herbaceous plant species are predominant in the northern part of the Tundra ecosystems and shrubs are prevalent in the southern part. [Pg.133]

Element Trees Shrubs Total Leaves Stems, twigs Roots... [Pg.156]

With aridity increasing, various plant species of forage crops become gradually less numerous to finally disappear. In Dry Steppe ecosystems xerophylic half-shrubs and salt-tolerant plants replace the grasses. However, the ash content is higher in these species. This is attributed not only to a higher concentration of major ash elements in the plant tissue, but also to the exposure to finely dispersed dust adhered to the plants exterior (Table 9). [Pg.176]

In 1918 these two chemists and C. F. Miller analyzed about fifty samples of legumes, grasses (including grains), vegetables, trees, and shrubs grown in nine different soils of known composition or from localities where certain rare elements were known to occur, Lithium was found in spectroscopic traces in all the plants they examined (67). [Pg.490]

One of the features of the forest fire problem making rigorous analysis difficult is the presence of individual trees, shrubs, bushes, trunks, branches, leaves and occasional human structure. To simulate these elements in detail with sufficient accuracy to replicate individual vortical motions would be intractable. Over a region of even a few acres there must be thousands of individual unequally sized and spaced objects. [Pg.300]

To harmonise with one s surroundings and the elements, contact is really essential, and the use of the Golden Dawn formula is a step in that direction. For those of you who have never tried this before it is suggested that you record everything, and try to make contact with the various plants, flowers and shrubs from the area where you live. In this way the auric vibrations will be more easily detectable to you. It is essential that, during the alchemical ritual, you use this link with the plant or the herb to impregnate its vital forces through your own aura. [Pg.138]

We can see Cb values for lead, zinc, tin, nickel, and copper are an order of magnitude higher than those for zirconium, titanium, and vanadium. We can observe also that the curves follow a similar pattern independently of the composition of the bedrock, diabasis orgneissic, underlying the forest ecosystems. Simultaneously, various plants absorb the same elements at a different rate. For instance, mosses are better accumulators of poorly absorbed metals, like Ti, Zr, V, than tree and small shrubs. The selective accumulation of metals by plants can be used in prospecting for trace metal ore deposits. [Pg.258]

We will consider both Steppe and Desert ecosystems as deficient in atmospheric humidity (evapotranspiration exceeds precipitation). The Sub-Boreal, Semi-arid and Arid Steppe and Desert ecosystems occupy a significant part of the global area. This territory includes Sub-Boreal zones (Steppe, Arid Steppe, and Desert Steppe ecosystems) with total area of 9.23 x 10 km, as well as subtropical zones (Shrub Steppe and Desert Steppe ecosystems) with total area of 7.04 x 10 km. These areas do not include Subtropical and Tropical Sandy Desert ecosystems (5.77 x 10 km-) and Stony Desert ecosystems (8.96 x 10 km ). Thus the extra-tropical arid area takes about 20% of the World s terrestrial ecosystems. Most of this area goes to the inter-continental regions of Eurasia and, partly, of North and South America. The biogeochemistry of semi-arid and arid ecosystems shows distinctive parameters, which allow us to consider the quantitative features of element turnover and dynamics in natural fluxes. [Pg.274]

In winter, the barks of trees and shrubs are poor in sodium, potassium, phosphorus and iron, but rich in zinc, cadmium and the alkaline earth elements calcium, magnesium, strontium, and barium (Anke et al. 2001 a,b,c). [Pg.112]

Trees and shrubs usually contain small amounts of beryllium (<0.1 mgkg ), with the element usually accumulating in the leaves and stems. Whether plant ash contains more or less beryllium than the soil is uncertain. [Pg.578]

Adolphson C. and Simmons R.W., Compositions having available trace elements and process of making same and providing for nutrition of plants, shrubs and trees, US Patent 3,244,505, 1966. [Pg.239]


See other pages where Element shrub is mentioned: [Pg.2182]    [Pg.8]    [Pg.288]    [Pg.318]    [Pg.167]    [Pg.16]    [Pg.172]    [Pg.65]    [Pg.37]    [Pg.66]    [Pg.1938]    [Pg.201]    [Pg.2430]    [Pg.318]    [Pg.115]    [Pg.118]    [Pg.663]    [Pg.2411]    [Pg.199]    [Pg.242]    [Pg.342]    [Pg.2186]    [Pg.32]    [Pg.798]    [Pg.129]    [Pg.67]    [Pg.61]    [Pg.103]    [Pg.360]    [Pg.46]    [Pg.841]    [Pg.8]    [Pg.12]    [Pg.12]    [Pg.31]    [Pg.34]   


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