Allow understory leaves to have a different turnover rate than canopy leaves #1136

4 / 4 tasks completed

All tasks have been completed

Task	Status
The in-code documentation has been updated with descriptive comments	Completed
The documentation has been assessed to determine if updates are necessary	Completed
FATES PASS/FAIL regression tests were run	Completed
Evaluation of test results for answer changes was performed and results provided	Completed
Technical Note update:	Incomplete
User's Guide update:	Incomplete
since all stem biomass of grasses are considered as sapwood, knowing basal diameter (d) of a greass and by assuming the architecture of a grass is a cylinder we can calculate the cross sectional area for grass stems as a whole as pi * (d/2)^2. This, however, might not be realistic as I think the basic water transporting unit is grass tiller, which has a much smaller cross sectional area compared to all the tillers as a whole trunk.	Incomplete
We can add a user-defined tiller number (n) for grass PFT, and calculate cross sectional area for each tiller roughtly as pi * (d/2)^2/n. But I'm not sure how this will influence the fate of a grass PFT under dry condition. Does mortality apply to the entire plant when one tiller failed (as they all have the same cross sectional area?) or there is a threshold percent of tiller hydo failure (e.g. 50% failure) and once passed we say the plant died (seems impossible as again they have exact same cross sectional area)?	Incomplete