Structural heterogeneity and spatial autocorrelation in a natural mature Pinus sylvestris dominated forest
| Autor: | Timo Kuuluvainen, Kari Heikkinen, Timo J. Hokkanen, Erkki Järvinen, Seppo Rouvinen |
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| Rok vydání: | 1998 |
| Předmět: |
0106 biological sciences
Alnus incana 010504 meteorology & atmospheric sciences biology Ecology Semivariance Species diversity Picea abies Understory 15. Life on land Sorbus aucuparia biology.organism_classification 010603 evolutionary biology 01 natural sciences Spatial ecology Spatial analysis Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences |
| Zdroj: | Ecography. 21:159-174 |
| ISSN: | 1600-0587 0906-7590 |
| DOI: | 10.1111/j.1600-0587.1998.tb00670.x |
| Popis: | The tree species composition, vertical stratification and patterns of spatial autocorrelation at the tree and quadrate (25 x 25 m) scales were studied in a natural mature Pinus sylvestris dominated forest in eastern Finland. For the analyses we mapped the locations and dimensions of trees taller than 10 m in a 9 ha (300 x 300 m) area, and within this area we mapped all trees taller than 0.3 m on a core plot of 4 ha (200 x 200 m). The overall tree size distribution was bimodal, the dominant layer and the understory forming the peak frequencies. Pinus sylvestris dominated the main canopy, together with scattered Betula pendula and Picea abies. Alnus incana, Populus tremula, Salix caprea, Sorbus aucuparia and Juniperus communis occurred only in the under- and middlestories. Autocorrelation analysis (semivariance) of tree size variation revealed spatial patterns, which were strongly dependent on the size of trees included in the analysis. When all living trees, including the understory regeneration, were taken into account, the autocorrelation pattern ranged up to 35 m inter-tree distances, reflecting the spatial scale of understory regeneration patches. Competitive interaction among middle- and upperstory trees (height >10 m) had contrasting effects on autocorrelation pattern depending on spatial scale. At the fine scale, dominant trees suppressed their smaller close neighbors (asymmetric competition), which was shown as increased tree size variation at small inter-tree distances ( |
| Databáze: | OpenAIRE |
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