Ergebnisse der Beobachtungen an den nordchilenischen Hochgebirgsstationen Collahuasi und Chuquicamata

Lauscher, Friedrich

doi:10.1007/978-3-7091-3980-6_6

Cited by 4 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compiled from data by Arno (1984); Aulitzky (1961); Goldstein et al (1994); Grace (1977); Hermes (1955);Hnatiuk et al (1976);Lauer (1988);Lauscher (1976Lauscher ( / 1977; Miehe (1989); Miehe and Miehe (1994); Rundel (1974); Sonesson and Hoogesteger (1983);Troll (1973); Wardle (1971Wardle ( ,1974 son. Since growth tends to be much more sensitive to temperature than photosynthesis (KoÈ rner and Larcher 1988; KoÈ rner and Pelaez Menendez-Riedl 1989; see also below) and because most of the expansion growth outside the tropics and subtropics occurs early in the season when temperatures are still low, this temperature is also of limited physiological relevance.…”

Section: Air Temperature Of the Warmest Monthmentioning

confidence: 99%

A re-assessment of high elevation treeline positions and their explanation

1998

View full text Add to dashboard Cite

In this review I ®rst compile data for the worldwide position of climate-driven alpine treelines. Causes for treeline formation are then discussed with a global perspective. Available evidence suggests a combination of a general thermal boundary for tree growth, with regionally variable``modulatory'' forces, including the presence of certain taxa. Much of the explanatory evidence found in the literature relates to these modulatory aspects at regional scales, whereas no good explanations emerged for the more fundamental global pattern related to temperature per se, on which this review is focused. I hypothesize that the life form``tree'' is limited at treeline altitudes by the potential investment, rather than production, of assimilates (growth as such, rather than photosynthesis or the carbon balance, being limited). In shoots coupled to a cold atmosphere, meristem activity is suggested to be limited for much of the time, especially at night. By reducing soil heat¯ux during the growing season the forest canopy negatively a ects root zone temperature. The lower threshold temperature for tissue growth and development appears to be higher than 3°C and lower than 10°C, possibly in the 5.5±7.5°C range, most commonly associated with seasonal means of air temperature at treeline positions. The physiological and developmental mechanisms responsible have yet to be analyzed. Root zone temperature, though largely unknown, is likely to be most critical.

show abstract

Section: Air Temperature Of the Warmest Monthmentioning

confidence: 99%

A re-assessment of high elevation treeline positions and their explanation

1998

View full text Add to dashboard Cite

show abstract

“…In fact, all of the high-altitude stations in the European Alps are on such 'extreme' sites (Jungfrau-and Weissfluh-Joch in Switzerland, Zugspitze in Germany and Sonnblick in Austria). Tropical mountains are particularly calm [57]. Hence, there is no general altitudinal pattern of ecologically relevant wind velocity that one could refer to [6].…”

mentioning

confidence: 98%

“…22 No.11 islands [46,57]. In addition, compact low-stature alpine vegetation produces calm plant canopy conditions.…”

mentioning

confidence: 99%