Climate |
Growing degree days |
GDD |
Annual sum of degree-days over a
0°C soil temperature |
Average across 2009-2019 |
Plot |
SAFRAN-
SURFEX/ISBA-Crocus-MEPRA reanalysis (Vernay et al.
2021) |
|
Annual precipitation |
AP |
The sum of all the monthly precipitation
estimates |
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Frost degree days |
FDD |
Annual sum of average daily degrees below
zero in soil temperature. Summarizes the duration and intensity of
ground freezing events. |
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Soil |
Soil pH |
pH |
Top-soil wahter pH |
Same year than the sample was
collected (2016-2020) |
Sample |
Measured in the lab |
|
Soil Organic Matter |
SOM |
Soil organic matter content |
|
Sample |
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Soil C/N |
C/N |
Soil carbon to nitrogen ration in organic matter |
|
Sample |
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Vegetation |
Plant taxonomic dissimilarity |
|
Jaccard pairwise
dissimilarity index between subplots. |
Same year than the sample was
collected (2016-2020) |
Plot |
Botanical surveys |
|
Plant functional dissimilarity
|
|
Jaccard-like functional index.
Traits: specific leaf area (SLA), leaf C/N, root depth (ordered
variable), vegetative plant height, and woodyness index (categorical
variable ranging from herbaceous to woody).
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|
Plot
|
Botanical surveys and our own trait measurement values for species
(median values across individuals). Root depth was , extracted from
(Landolt et al. 2010).
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Normalized Difference Vegetation Index |
NDVI |
Estimated from the
surface spectral reflectance at a resolution of 250 m. Raw NDVI times
series were pre-processed following (Choler 2015), and we kept the mean
yearly sum of NDVI greater than 0.2 |
Average across 2010-2020 |
Plot |
MODIS (Moderate Resolution Imaging Spectroradiometer), available online:
https://lpdaac.usgs.gov/produ cts/mod09q1v006/. |