Tracking the long-term structure changes of a mature deciduous broadleaf forest stand using digital hemispherical photography

Q4 Agricultural and Biological Sciences
Mait Lang, J. Pisek
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引用次数: 1

Abstract

Abstract Hemispherical photography provides permanent records of forest canopy structure. We analysed digital hemispherical images taken during the period of 2007–2018 in a mature silver birch stand located in Järvselja, Estonia. The stand was thinned in 2004. Understory trees were removed in the spring of 2018. Images were processed using the LinearRatioSC method. Effective plant area index Leff during the leafless phenophase increased as a result of tree growth from 0.92 to 1.24 and understory cutting was not detectable. During the full foliage condition Leff increased from 3.6 in 2008 to 5.8 in 2017. After removal of understory trees from the stand Leff decreased, and repeated measurements in the summer of 2018 estimated the plant area index range 4.5 < Leff < 4.8. The results are in agreement with the expected changes following forest growth and demonstrate that LinearRatioSC is a suitable method for the estimation and long-term monitoring of forest canopy properties from digital hemispherical images.
利用数字半球面摄影技术跟踪成熟落叶阔叶林林分的长期结构变化
半球形摄影提供了森林冠层结构的永久记录。我们分析了2007-2018年期间在爱沙尼亚Järvselja的一个成熟白桦林拍摄的数字半球形图像。2004年,看台被削薄了。2018年春天,林下树木被移走。使用LinearRatioSC方法处理图像。无叶物候期的有效面积指数由0.92增加到1.24,林下未见砍伐。在全叶状态下,叶率从2008年的3.6上升到2017年的5.8。林下植被被伐后,林下植被面积指数呈下降趋势,2018年夏季重复测量,林下植被面积指数为4.5 < Leff < 4.8。结果与预期的森林生长变化一致,表明线性比率osc是一种适合从数字半球图像估计和长期监测森林冠层特性的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Forestry Studies
Forestry Studies Agricultural and Biological Sciences-Forestry
CiteScore
0.70
自引率
0.00%
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