Download Alpine Treelines: Functional Ecology of the Global High by Christian Körner PDF

By Christian Körner

Alpine treelines mark the low-temperature restrict of tree progress and take place in mountains world-wide. providing a better half to his booklet Alpine Plant Life, Christian Körner presents a world synthesis of the treeline phenomenon from sub-arctic to equatorial latitudes and a practical rationalization in accordance with the biology of bushes. the excellent textual content methods the topic in a multi-disciplinary means by means of exploring wooded area styles on the fringe of tree existence, tree morphology, anatomy, climatology and, in line with this, modelling treeline place, describing copy and inhabitants methods, improvement, phenology, evolutionary facets, in addition to summarizing facts at the body structure of carbon, water and nutrient relatives, and rigidity body structure. It closes with an account on treelines long ago (palaeo-ecology) and a bit on worldwide swap results on treelines, now and sooner or later. With greater than a hundred illustrations, lots of them in color, the ebook exhibits alpine treelines from worldwide and gives a wealth of clinical details within the kind of diagrams and tables.

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Extra info for Alpine Treelines: Functional Ecology of the Global High Elevation Tree Limits

Sample text

How do we know when a tree is active? How do we define ‘activity’? g. mitochondrial respiration in winter). Winter time respiration in treeline trees at temperate latitudes is so low that it has hardly any effect on the annual carbon balance (Wieser 1997). A common convention thus, refers to meristematic activity (cambial or apical growth, both above and below ground) and ongoing tissue maturation (cell wall formation, lignification). In regions with a pronounced thermal seasonality, this period is very similar to the snow-free period.

The two short season extremes of only ca. 1). Even at the equator there is some thermal seasonality, induced by rainfall seasonality. The rainy season is commonly associated with prolonged cloud cover, causing atmospheric cooling, with temperatures at treeline elevations periodically dropping below the thermal threshold, hence, the smaller than 365 days length of the growing season. The variation of season length is very small across 12 locations in the Alps, with a mean of 135 days, which is not significantly different from that in central Asia.

3). 4 Treeline elevation Fig. 4. The latitudinal variation of treeline and snowline modelled by climatic drivers (K€ orner 2007a; see also Chap. 5). Note the parallel trend in the biological boundary (treeline) with the purely physics-driven snowline and eastern Himalayas and rise to 4500–4700 m elevation at similar latitudes in Tibet. g. near Innsbruck) and is found at 2350 m in the central Swiss Alps. On the Amazonian slope, the Andean treeline is at 3800 m in Bolivia, but climbs to 4800 m in the Altiplano region.

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