Seedling occurrence in alpine treeline conifers : A case study from the central Rocky Mountains, USA
Identifieur interne : 00D621 ( Main/Merge ); précédent : 00D620; suivant : 00D622Seedling occurrence in alpine treeline conifers : A case study from the central Rocky Mountains, USA
Auteurs : S. H Ttenschwiler [Suisse] ; W. K. Smith [États-Unis]Source :
- Acta oecologica : (Montrouge) [ 1146-609X ] ; 1999.
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Abstract
Information concerning the occurrence of very young (1- to 10-year-old) tree seedlings in the alpine treeline ecotone is rare Seedling occurrence of the dominant conifers Picea engelmannii and Abies lasiocarpa was measured in the treeline ecotone of the Medicine Bow Mountains, Wyoming (central Rocky Mountains, USA), an area composed of elongated tree islands separated by open meadows (ribbon forest) that grade into the closed forest. No seedlings were found on the windward sides of tree islands, while a mean of 0.6 seedlings.m-2 occurred on the leeward (downward) sides. These values compared to the 4.2 seedlings.m-2 in the closed forest. In addition, a strong correspondence was found between snowpack depth and seedling abundance, with depths that were either too shallow (< 0.5 m) or too deep (>1.5 m) associated with fewer or no seedlings, A. lasiocarpa seedlings made up much less of the overall seedling population in the ribbor forest (6 %) than in the closed forest (22 %). Seedling establishment in this portion of the alpine treeline ecotone appears to be occurring at a low rate that differs between the two dominant species and may be strongly influenced by wind-driven snow accumulation patterns.
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Pascal:99-0430658Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Seedling occurrence in alpine treeline conifers : A case study from the central Rocky Mountains, USA</title><author><name sortKey="H Ttenschwiler, S" sort="H Ttenschwiler, S" uniqKey="H Ttenschwiler S" first="S." last="H Ttenschwiler">S. H Ttenschwiler</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Botany, University of Basel, Schönbeinstrasse 6</s1><s2>4056 Basel</s2><s3>CHE</s3><sZ>1 aut.</sZ></inist:fA14><country>Suisse</country><wicri:noRegion>4056 Basel</wicri:noRegion></affiliation></author><author><name sortKey="Smith, W K" sort="Smith, W K" uniqKey="Smith W" first="W. K." last="Smith">W. K. Smith</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Botany, University of Wyoming</s1><s2>Laramie Wyoming 82071</s2><s3>USA</s3><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Laramie Wyoming 82071</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">99-0430658</idno><date when="1999">1999</date><idno type="stanalyst">PASCAL 99-0430658 INIST</idno><idno type="RBID">Pascal:99-0430658</idno><idno type="wicri:Area/PascalFrancis/Corpus">006258</idno><idno type="wicri:Area/PascalFrancis/Curation">006D96</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">005F08</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">005F08</idno><idno type="wicri:doubleKey">1146-609X:1999:H Ttenschwiler S:seedling:occurrence:in</idno><idno type="wicri:Area/Main/Merge">00D621</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Seedling occurrence in alpine treeline conifers : A case study from the central Rocky Mountains, USA</title><author><name sortKey="H Ttenschwiler, S" sort="H Ttenschwiler, S" uniqKey="H Ttenschwiler S" first="S." last="H Ttenschwiler">S. H Ttenschwiler</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Botany, University of Basel, Schönbeinstrasse 6</s1><s2>4056 Basel</s2><s3>CHE</s3><sZ>1 aut.</sZ></inist:fA14><country>Suisse</country><wicri:noRegion>4056 Basel</wicri:noRegion></affiliation></author><author><name sortKey="Smith, W K" sort="Smith, W K" uniqKey="Smith W" first="W. K." last="Smith">W. K. Smith</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Botany, University of Wyoming</s1><s2>Laramie Wyoming 82071</s2><s3>USA</s3><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Laramie Wyoming 82071</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Acta oecologica : (Montrouge)</title><title level="j" type="abbreviated">Acta oecol. : (Montrouge)</title><idno type="ISSN">1146-609X</idno><imprint><date when="1999">1999</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Acta oecologica : (Montrouge)</title><title level="j" type="abbreviated">Acta oecol. : (Montrouge)</title><idno type="ISSN">1146-609X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Abies lasiocarpa</term><term>Climate</term><term>Ecotone</term><term>Forests</term><term>Picea engelmannii</term><term>Plant juvenile growth stage</term><term>Population density</term><term>Population dynamics</term><term>Rocky Mountains</term><term>Snow cover</term><term>Survival</term><term>Wyoming</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Stade juvénile plante</term><term>Densité population</term><term>Dynamique population</term><term>Ecotone</term><term>Couverture neige</term><term>Climat</term><term>Survie</term><term>Forêt</term><term>Abies lasiocarpa</term><term>Picea engelmannii</term><term>Wyoming</term><term>Rocheuses</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Climat</term><term>Forêt</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Information concerning the occurrence of very young (1- to 10-year-old) tree seedlings in the alpine treeline ecotone is rare Seedling occurrence of the dominant conifers Picea engelmannii and Abies lasiocarpa was measured in the treeline ecotone of the Medicine Bow Mountains, Wyoming (central Rocky Mountains, USA), an area composed of elongated tree islands separated by open meadows (ribbon forest) that grade into the closed forest. No seedlings were found on the windward sides of tree islands, while a mean of 0.6 seedlings.m<sup>-2</sup> occurred on the leeward (downward) sides. These values compared to the 4.2 seedlings.m<sup>-2</sup> in the closed forest. In addition, a strong correspondence was found between snowpack depth and seedling abundance, with depths that were either too shallow (< 0.5 m) or too deep (>1.5 m) associated with fewer or no seedlings, A. lasiocarpa seedlings made up much less of the overall seedling population in the ribbor forest (6 %) than in the closed forest (22 %). Seedling establishment in this portion of the alpine treeline ecotone appears to be occurring at a low rate that differs between the two dominant species and may be strongly influenced by wind-driven snow accumulation patterns.</div></front></TEI><affiliations><list><country><li>Suisse</li><li>États-Unis</li></country></list><tree><country name="Suisse"><noRegion><name sortKey="H Ttenschwiler, S" sort="H Ttenschwiler, S" uniqKey="H Ttenschwiler S" first="S." last="H Ttenschwiler">S. H Ttenschwiler</name></noRegion></country><country name="États-Unis"><noRegion><name sortKey="Smith, W K" sort="Smith, W K" uniqKey="Smith W" first="W. K." last="Smith">W. K. Smith</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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