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Articles containing the keyword 'spatial structure'
Category : Research article
article id 1279,
category
Research article
Andreas Kreutz,
Tuomas Aakala,
Russell Grenfell,
Timo Kuuluvainen.
(2015).
Spatial tree community structure in three stands across a forest succession gradient in northern boreal Fennoscandia.
Silva Fennica
vol.
49
no.
2
article id 1279.
https://doi.org/10.14214/sf.1279
Keywords:
Picea abies;
age structure;
spatial structure;
natural forest;
Betula spp.;
point pattern analysis;
northern boreal;
community composition
Highlights:
We studied the tree community spatial structure in three 1.2-ha plots representing naturally developed northern boreal forests of varying ages; Spatial structure showed little differences between the mid-successional, late-successional and old-growth stands; The occurrence of Picea abies relative to Betula spp. indicated a mosaic-like spatial assembly; Mosaics are likely maintained by species-specific replacement, not reciprocal replacement as thought earlier.
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Author Info
Development of species composition during succession is well studied in natural boreal forests, but empirical assessments of how within-stand spatial structure develops in late-successional stages are few. Here, we quantified spatial patterns in three unmanaged stands consisting of Picea abies (L.) Karst. and Betula pubescens Ehrh. and Betula pendula Roth (hereafter Betula spp.) in northern boreal Fennoscandia. We conducted a comprehensive analysis of small-scale spatial point patterns in three fully mapped 1.2-ha sample plots, representing different forest developmental stages: mid-successional, late-successional and old-growth forest. We used several variants of Ripley’s K-function to analyze the spatial point patterns along the successional gradient. Univariate analyses showed that mature trees of both species were either randomly distributed or clumped. P. abies saplings were clumped, and Betula spp. saplings occurred in a random or clumped manner. In the bivariate analyses, saplings were more likely to be found in the surroundings of mature trees of the same species, but occurred independent of the individuals of other tree species. Mature trees showed interspecific repulsion. Only modest differences occurred in the univariate patterns between the three successional stages, but in the bivariate analyses the most evident patterns, i.e. intraspecific attraction and interspecific repulsion, were stronger in the older successional stages. Overall, the studied stands appear structured as species-specific mosaics. These mosaics, along with mixed species composition, seem to be maintained by species self-replacement, which contrasts with findings from earlier studies.
- Kreutz, Department of Forest Sciences, University of Helsinki, P.O. Box 27, FI-00014 University of Helsinki, Finland E-mail: andreas.kreutz@wald-rpl.de
-
Aakala,
Department of Forest Sciences, University of Helsinki, P.O. Box 27, FI-00014 University of Helsinki, Finland
http://orcid.org/0000-0003-0160-6410
E-mail:
tuomas.aakala@helsinki.fi
- Grenfell, Department of Forest Sciences, University of Helsinki, P.O. Box 27, FI-00014 University of Helsinki, Finland E-mail: russell.grenfell@gmail.com
- Kuuluvainen, Department of Forest Sciences, University of Helsinki, P.O. Box 27, FI-00014 University of Helsinki, Finland E-mail: timo.kuuluvainen@helsinki.fi
article id 75,
category
Research article
Silvia Lamedica,
Emanuele Lingua,
Ionel Popa,
Renzo Motta,
Marco Carrer.
(2011).
Spatial structure in four Norway spruce stands with different management history in the Alps and Carpathians.
Silva Fennica
vol.
45
no.
5
article id 75.
https://doi.org/10.14214/sf.75
Keywords:
Picea abies;
LISA;
old-growth forests;
point pattern analyses;
random mortality;
spatial structure
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In Europe most Norway spruce (Picea abies (L.) Karst.) mountain forests have been altered by human activities, leading to a lack of reference condition concerning their original structure. Nonetheless, remnants of Norway spruce primeval forests still exist in the Carpathians. Our objective was to assess the differences in structure between managed and unmanaged stands, concerning diameter distributions, amount of standing deadwood, spatial distributions and spatial structure of trees. We established four permanent plots: one in a virgin forest in the Eastern Carpathians and three in a previously managed forest in the Alps. In each plot, species, DBH, and position of the live and dead standing trees were collected. Spatial distribution and structure of all the trees was analysed through several indices. In the Carpathians forest there are clear signs of natural density-dependent mortality processes whereas in the Alpine plots such dynamics are less evident. In these latter plots, the lower snags volume and the random trees spatial distribution can be considered the legacies of past management. Nonetheless, despite the different history of the four stands, they all seem to converge towards a similar spatial structure with the presence of groups (30–40 m) of trees of similar size.
- Lamedica, Forest Ecology Research Unit, Dept TeSAF, University of Padova, Legnaro (PD), Italy E-mail: sl@nn.it
- Lingua, Forest Ecology Research Unit, Dept TeSAF, University of Padova, Legnaro (PD), Italy E-mail: el@nn.it
- Popa, Forest Research and Management Institute, Research Station for Norway Spruce Silviculture, Câmpulung Moldovenesc, Romania E-mail: ip@nn.ro
- Motta, Department AGROSELVITER, University of Torino, Grugliasco (TO), Italy E-mail: rm@nn.it
-
Carrer,
Forest Ecology Research Unit, Dept TeSAF, University of Padova, Legnaro (PD), Italy
E-mail:
marco.carrer@unipd.it
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