J. For. Sci., 2018, 64(11):455-468 | DOI: 10.17221/112/2018-JFS

LaiPen LP 100 - a new device for estimating forest ecosystem leaf area index compared to the etalon: A methodologic case studyOriginal Paper

Jakub ČERNÝ*,1,2, Jan KREJZA3, 4, Radek POKORNÝ2, Pavel BEDNÁŘ1
1 Forestry and Game Management Research Institute, Strnady, Opočno Research Station, Opočno, Czech Republic
2 Department of Silviculture, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic
3 Global Change Research Institute of the Czech Academy of Sciences, Brno, Czech Republic 4 Centre MendelGlobe, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic

Fast and precise leaf area index (LAI) estimation of a forest stand is frequently needed for a wide range of ecological studies. In the presented study, we compared side-by-side two instruments for performing LAI estimation (i.e. LaiPen LP 100 as a "newly developed device" and LAI-2200 PCA as the "world standard"), both based on indirect optical methods for performing LAI estimation in pure Norway spruce (Picea abies (Linnaeus) H. Karsten) stands under different thinning treatments. LAI values estimated by LaiPen LP 100 were approximate 5.8% lower compared to those measured by LAI-2200 PCA when averaging all collected data regardless of the thinning type. Nevertheless, when we considered the differences among LAI values at each measurement point within a regular grid, LaiPen LP 100 overestimated LAI values compared to those from LAI-2200 PCA on average by 1.4%. Therefore, both instruments are comparable. Similar LAI values between thinning from above (A) and thinning from below (B) approaches were indirectly detected by both instruments. The highest values of canopy production index and leaf area efficiency were observed within the stand thinned from above (plot A).

Keywords: LAI-2200 PCA; indirect LAI; Norway spruce; thinning; canopy production index; leaf area efficiency

Published: November 30, 2018  Show citation

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ČERNÝ J, KREJZA J, POKORNÝ R, BEDNÁŘ P. LaiPen LP 100 - a new device for estimating forest ecosystem leaf area index compared to the etalon: A methodologic case study. J. For. Sci. 2018;64(11):455-468. doi: 10.17221/112/2018-JFS.
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