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Community Ecology

, Volume 10, Issue 1, pp 81–90 | Cite as

A comparison of three indirect methods for estimating understory light at different spatial scales in temperate mixed forests

  • F. Tinya
  • B. Mihók
  • S. Márialigeti
  • Zs. Mag
  • P. ÓdorEmail author
Article

Abstract

Three indirect light measurement methods were compared in mixed deciduous and coniferous forests with heterogeneous stand structure: tRAYci - a spatially explicit light model calculating percentage of above canopy light (PACL); LAI-2000 Plant Canopy Analyzer measuring diffuse non-interceptance (DIFN); and spherical densiometer estimating canopy openness (CO). Correlations between the different light variables were analyzed at several spatial scales (at 5 × 5, 10 × 10, 15 × 15, 20 × 20 and 30 × 30 m2). Relationships between light variables and the cover of alight flexible plant, blackberry (Rubus fruticosus agg.), as a potentially sensitive response variable for light conditions were also investigated. LAI-2000 (D1FN) and tRAYci (PACL) seemed the most appropriate for the description of the light environment in the investigated stands. DIFN and PACL had stronger correlations with each other and with blackberry cover than CO. Spatial heterogeneity of light (expressed with coefficient of variation) showed much stronger correlations than mean values both between the methods and between light intensity and Rubus cover. The correlation values between the methods increased towards coarser scales (from 5 × 5 to 30 × 30 m2), while the correlation between light intensity and blackberry cover had a maximal response at the scale of 20 ×20 m2 if a lower resolution of light estimation was used, and had also a maximum at smaller scales if the light was calculated for more points per plot by tRAYci. LAI-2000 can be recommended for the comparison of different stands, however, for fine scale description of light conditions of a stand tRAYci seems to be more appropriate.

Keywords

Light model Light-understory interaction Plant canopy analyzer Spatial steps Spherical densiometer 

Abbreviations

DIFN

Diffuse Non-interceptance

CO

Canopy Openness

DBH

Diameter at Breast Height

LAD

Leaf Area Density

PACL

Percentage of the Above Canopy Light

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© Akadémiai Kiadó, Budapest 2008

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • F. Tinya
    • 1
    • 2
  • B. Mihók
    • 1
  • S. Márialigeti
    • 1
  • Zs. Mag
    • 1
  • P. Ódor
    • 1
    Email author
  1. 1.Department of Plant Taxonomy and EcologyLoránd Eötvös UniversityBudapestHungary
  2. 2.Department of Plant PathologyCorvinus University of BudapestBudapestHungary

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