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SCBI-ForestGEO / McGregor_climate-sensitivity-variation

repository for linking the climate sensitity of tree growth (derived from cores) to functional traits
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give good description of droughts in publication #39

Closed teixeirak closed 5 years ago

teixeirak commented 5 years ago

@mcgregorian1 , please see this pub. Let's follow their recommendations regarding providing sufficient info about the droughts.

mcgregorian1 commented 5 years ago

report percentages for lloret function, also use pdsi. make point that this study gives a definition of drought, which isn't common

mcgregorian1 commented 5 years ago

@teixeirak This is an updated short paragraph of how we determined drought, following what that publication said (and cited as well). Were you thinking more than this?

To accurately understand climate sensitivity, this study used a specific definition of drought, which is not a common practice [@slette_how_2019]. We used the pointRes package [@R-pointRes] in R (version 3.5.3) to determine drought periods based on trees' drought resistance, which is defined by [@lloret_components_2011] as the ratio between the performance during and before the disturbance. Candidate drought years were defined if >50% of the cored trees experienced <30% growth in a year compared to the previous 5 years. These were then cross-validated with the regional Palmer Drought Severity Index (PDSI) values for each year, which yielded a set of three periods that were consistently shown as drought: 1964-1966, 1977, and 1999.

teixeirak commented 5 years ago

That's good for the methods. We'll want a description in the results of the % that suffered growth reductions, PDSI, and maybe some other climate variables (e.g., PET and PRE, pulled from the time series figure?)

teixeirak commented 5 years ago

We are now set up to do this. There are a few numbers left to fill in the text, but this issue can be closed.