Hur man beräknar leaf area index

Leaf area index is the one-sided, green leaf area of a canopy or plant community per unit ground area. To directly measure LAI, you would have to measure the area of each leaf in the canopy above a unit of ground area. Because this method is both destructive and incredibly time consuming, it is rarely used. 1 2 Leaf area index (LAI) is a dimensionless quantity that characterizes plant canopies. It is defined as the one-sided green leaf area per unit ground surface area (LAI = leaf area / ground area, m 2 / m 2) in broadleaf canopies. In conifers, three definitions for LAI have been used: Half of the total needle surface area per unit ground. 3 4 sity/courses/multispectral-earth-observation-applications-using-esa-sentinel-application-platformLearn Multispectral Earth Observation. 5 Leaf area index (LAI) is a critical vegetation structural variable and is essential in the feedback of vegetation to the climate system. The advancement of the global Earth Observation has enabled the development of global LAI products and boosted global Earth system modeling studies. 6 LAI defines the number of equivalent layers of leaves relative to a unit of ground area, while fPAR measures the proportion of available radiation in the photosynthetically active wavelengths that is absorbed by a canopy. KEYWORDS: MODIS, LPDAAC, vegetation. DATA LICENCE. 7 8 Leaf Area Index (Bladyteindex) Definitionen är ”. 9 Om du vill beräkna värdena för woody area index från de fältmätade rådata använder du lövområdesindexet File Viewer-freeware och. 10 12
hur man beräknar leaf area index