An explanation for alpine timberline
نویسندگان
چکیده
منابع مشابه
Frost drought in conifers at the alpine timberline: xylem dysfunction and adaptations.
Drought stress can cause xylem embolism in trees when the water potential (psi) in the xylem falls below specific vulnerability thresholds. At the alpine timberline, frost drought is known to cause excessive winter embolism unless xylem vulnerability or transpiration is sufficiently reduced to avoid critical psi. We compared annual courses of psi and embolism in Picea abies, Pinus cembra, Pinus...
متن کاملCarbon dioxide gas exchange of cembran pine (Pinus cembra) at the alpine timberline during winter.
Winter CO(2) gas exchange of the last three flushes of cembran pine (Pinus cembra L.) was studied under ambient conditions at the alpine timberline, an ecotone with strong seasonal changes in climate. During the coldest months of the year, December to March, gas exchange was almost completely suppressed and even the highest irradiances and temperatures did not cause a significant increase in ne...
متن کاملTree Recruitment at the Nothofagus pumilio Alpine Timberline in Tierra del Fuego, Chile
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متن کاملHydraulic efficiency and safety of leader shoots and twigs in Norway spruce growing at the alpine timberline.
Xylem within trees varies in its hydraulic efficiency and safety. Trees at the alpine timberline were expected to exhibit a hydraulic architecture protecting the leader shoot from winter embolism. Hydraulic and related anatomical parameters were compared as well as seasonal courses of winter embolism in leader shoots and twigs of Norway spruce trees growing at 2000 m. Leader shoots had a 1.4-fo...
متن کاملWhere to Combat Shrub Encroachment in Alpine Timberline Ecosystems: Combining Remotely-Sensed Vegetation Information with Species Habitat Modelling
In many cultural landscapes, the abandonment of traditional grazing leads to encroachment of pastures by woody plants, which reduces habitat heterogeneity and impacts biodiversity typical of semi-open habitats. We developed a framework of mutually interacting spatial models to locate areas where shrub encroachment in Alpine treeline ecosystems deteriorates vulnerable species' habitat, using bla...
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ژورنال
عنوان ژورنال: New Zealand Journal of Botany
سال: 1971
ISSN: 0028-825X,1175-8643
DOI: 10.1080/0028825x.1971.10430192