I am searching for a method that allows to estimate the effect of exposure to PAR on establishment and growth of tree seedlings below a forest canopy, in a context where completely overcast conditions are hard to find.
Hello,
Please Check this paper:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3348792/
Varying sky conditions.....Do you think Leaf area index determination will be limited by sunlight? I don't think so. In LAI, you need leaf area and land area!!!!
Kulasekaran Ramesh you are right, but normally the non-destructive methods used to estimate leaf area index are based on the proportion of sunlight reaching a determined point below the canopy. The problem is, direct sunlight normally reduces the accuracy of the estimates, and is therefore not recommended. Which is why I am asking about a suitable method that can be used even under direct sunlight (if there is any). Anyway, to avoid further confusions I think I should refer to canopy gap fraction rather than to LAI. Thanks.
We use hemisphaerical photography to record spatial variability in radiation associated to the canopy architecture and spot measurements of whole radiation outside the canopy (in a gap is ok...). In this way, you can integrate both micro and meso values in a forest plot
Thanks Eustaquio
Do you take hemispherical photographs outside the canopy as well? Is there any article where I could find out about the methodology you have applied?
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