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Evaluation and correction of optically derived leaf area index in different temperate forests

Zhili Liu, Guangze Jin   , Ming Zhou

iForest - Biogeosciences and Forestry, Volume 9, Issue 1, Pages 55-62 (2015)
doi: https://doi.org/10.3832/ifor1350-008
Published: Jun 11, 2015 - Copyright © 2015 SISEF

Research Articles


In recent years optical techniques for rapid LAI measurements have been developed, but few studies have been performed to evaluate the accuracy of optical estimation of LAI in mixed deciduous-evergreen forest stands. In this paper, we assessed the accuracy of digital hemispherical photography (DHP) and the LAI-2000 for the estimation of effective LAI (Le) by comparison with litter collection LAI (LAIlit) in four mixed deciduous broadleaf and evergreen needleleaf forests and one deciduous needleleaf forest. We also evaluated the relative contribution of major error sources to the determination of LAI by optical methods, including the woody-to-total area ratio (α), the element clumping index (ΩE) and the needle-to-shoot area ratio (γE). Additionally, incorrect automatic photographic exposure has been considered for DHP. DHP Le underestimated LAIlit by an average of 44-70% in different forests, and the difference between LAIlit and DHP Le after correction for the automatic exposure, α, ΩE and γE ranged from 1% to 21% in five forest stands. In contrast, LAI values from LAI-2000 were more similar to the direct litter collection LAI. The LAI-2000 Le underestimated LAIlit by an average of 13-40% in these forests, while the accuracy of the best estimates of LAI using LAI-2000 methods is over 93% after considering α, ΩE and γE. The error caused by automatic exposure to DHP Le is larger than other factors in all forest stands, and the γE was the main uncertainty to LAI-2000 Le in most forest stands. Moreover, optical LAI (both DHP and LAI-2000) was significantly (P < 0.01) correlated with LAIlit, especially the corrected LAI obtained by the LAI-2000 (R2 = 0.83, RMSE = 1.04). Our results demonstrate that the above factors affect the estimation of LAI by optical methods, thus the species composition of a forest stand should be seriously considered in order to improve the accuracy of LAI by optical methods.

  Keywords


Leaf Area Index (LAI), Digital Hemispherical Photography (DHP), LAI-2000, Woody Materials, Clumping Effects, Automatic Exposure, Litter Collection, Correlation

Authors’ address

(1)
Zhili Liu
Guangze Jin
Ming Zhou
Center for Ecological Research, Northeast Forestry University, Harbin 150040 (China)

Corresponding author

 
Guangze Jin
taxon@126.com

Citation

Liu Z, Jin G, Zhou M (2015). Evaluation and correction of optically derived leaf area index in different temperate forests. iForest 9: 55-62. - doi: 10.3832/ifor1350-008

Academic Editor

Giorgio Matteucci

Paper history

Received: May 13, 2014
Accepted: Mar 03, 2015

First online: Jun 11, 2015
Publication Date: Feb 21, 2016
Publication Time: 3.33 months

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