Plant distribution pattern across the forest-tundra ecotone: The importance of treeline position. Hofgaard, A. & Wilmann, B. Écoscience, 9(3):375–385, January, 2002. 00037Paper doi abstract bibtex The relationship between treeline position and field-layer diversity in the central Norwegian Mountains is examined by the use of multivariate techniques. Species and environmental data from altitudinal transects across the entire forest-tundra ecotone and various altitudinal partitions are analysed. The main variation in the species data show positive correspondence with altitude and distance to treeline and forest line and negative correspondence with factors related to the structure and presence of a tree cover. Distance to the treeline explained most of the variance in species distribution and most distribution boundaries are found in the vicinity of the treeline. Topography is an apparent factor only in a zone just above the treeline, and there is no correspondence between species occurrence and altitude in this zone. The importance of aspect is only evident at high altitudes, where plant communities are most exposed to abiotic environmental factors. Descending tree communities during the Holocene have produced plant communities above the present treeline that still are dependent on environmental conditions previously provided by the forest. Under present alpine conditions the main structuring force for vegetation composition is changed from being mainly biotic to abiotic. The long-term inertia of the field-layer composition across the forest-tundra ecotone is important to consider when making predictions of future responses of the ecotone.
@article{hofgaard_plant_2002,
title = {Plant distribution pattern across the forest-tundra ecotone: {The} importance of treeline position},
volume = {9},
issn = {1195-6860},
shorttitle = {Plant distribution pattern across the forest-tundra ecotone},
url = {https://doi.org/10.1080/11956860.2002.11682725},
doi = {10.1080/11956860.2002.11682725},
abstract = {The relationship between treeline position and field-layer diversity in the central Norwegian Mountains is examined by the use of multivariate techniques. Species and environmental data from altitudinal transects across the entire forest-tundra ecotone and various altitudinal partitions are analysed. The main variation in the species data show positive correspondence with altitude and distance to treeline and forest line and negative correspondence with factors related to the structure and presence of a tree cover. Distance to the treeline explained most of the variance in species distribution and most distribution boundaries are found in the vicinity of the treeline. Topography is an apparent factor only in a zone just above the treeline, and there is no correspondence between species occurrence and altitude in this zone. The importance of aspect is only evident at high altitudes, where plant communities are most exposed to abiotic environmental factors. Descending tree communities during the Holocene have produced plant communities above the present treeline that still are dependent on environmental conditions previously provided by the forest. Under present alpine conditions the main structuring force for vegetation composition is changed from being mainly biotic to abiotic. The long-term inertia of the field-layer composition across the forest-tundra ecotone is important to consider when making predictions of future responses of the ecotone.},
number = {3},
urldate = {2018-06-11},
journal = {Écoscience},
author = {Hofgaard, Annika and Wilmann, Bodil},
month = jan,
year = {2002},
note = {00037},
keywords = {\#nosource, Analyses d’ordination, Central Norway, Centre de la Norvège, Cmémoire écologique, Composition en espèces, Dynamique de la limite des arbres, Ecological memory, Holocene, Holocène, Ordination analyses, Species composition, Treeline dynamics},
pages = {375--385},
}
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The main variation in the species data show positive correspondence with altitude and distance to treeline and forest line and negative correspondence with factors related to the structure and presence of a tree cover. Distance to the treeline explained most of the variance in species distribution and most distribution boundaries are found in the vicinity of the treeline. Topography is an apparent factor only in a zone just above the treeline, and there is no correspondence between species occurrence and altitude in this zone. The importance of aspect is only evident at high altitudes, where plant communities are most exposed to abiotic environmental factors. Descending tree communities during the Holocene have produced plant communities above the present treeline that still are dependent on environmental conditions previously provided by the forest. Under present alpine conditions the main structuring force for vegetation composition is changed from being mainly biotic to abiotic. 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