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Single-tree influence on understorey vegetation in five Chinese subtropical forests

H-Y Liu (1)   , R Halvorsen (2)

iForest - Biogeosciences and Forestry, Volume 5, Issue 4, Pages 179-187 (2012)
doi: https://doi.org/10.3832/ifor0623-005
Published: Aug 02, 2012 - Copyright © 2012 SISEF

Research Articles


The aim of this study is to examine the effect of individual canopy tree on the species composition and abundance of understorey vegetation in subtropical forests, by applying a model for tree influence on understorey vegetation of boreal spruce forests developed by Økland et al. (1999), according to the principles of Ecological Field Theory (EFT). The study was based upon five vegetation data sets, each with two subsets (vascular plants species and bryophytes species) from subtropical forests in south and southwest China. Optimal value of tree influence model parameters was found by maximizing the eigenvalue of a Constrained Ordination (CO) axis, obtained by use of the EFT-based tree influence index as the only constraining variable. One CO method, Redundancy Analysis (RDA), was applied to five vegetation data sets. The results showed that the optimal EFT tree influence models generally accounted for only a small part of the variation in species composition (the eigenvalues of RDA axes were low, amounted to 1-10% of total inertia). The higher eigenvalue-tototal-inertia ratio with RDA was interpreted as due mainly to the low species turnover along the tree influence gradient. Vascular plants and bryophytes species differed with respect to optimal parameters in the tree influence model, especially in a conifer dominated forest. Compositional turnover associated with tree influence indices was also generally low, although somewhat varies among study areas. Thus, it was concluded that single-tree EFT models may have limited suitability for studied subtropical forests; different optimal parameters in the tree influence model obtained for vascular plants and bryophytes species in two studied areas indicates that subtropical trees may impact vascular plants and bryophytes species in different ways; and trees may influence the understorey species composition more in a collective manner than through the influence of single individuals in studied subtropical forests.

  Keywords


Competition, Understorey Vegetation, Bryophytes, Vascular Plants, Ecological Field Theory, Individual Tree Models

Authors’ address

(1)
H-Y Liu
Centre for Ecology and Economics, Norwegian Institute for Air Research, P.O. Box 100, 2027 Kjeller (Norway)
(2)
R Halvorsen
Department of Research and Collections, Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, 0318 Oslo (Norway)

Corresponding author

 
H-Y Liu
hyl@nilu.no

Citation

Liu H-Y, Halvorsen R (2012). Single-tree influence on understorey vegetation in five Chinese subtropical forests. iForest 5: 179-187. - doi: 10.3832/ifor0623-005

Academic Editor

Renzo Motta

Paper history

Received: Oct 24, 2011
Accepted: Jun 30, 2012

First online: Aug 02, 2012
Publication Date: Aug 29, 2012
Publication Time: 1.10 months

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