variable late summer NDVI NDVImax
summer T 0.47** 0.48**
early summer T 0.45** 0.44**
late summer T 0.40* 0.35*
late winter T 0.32* 0.25.
spring P 0.30* -
winter T 0.30* 0.26.
late winter P 0.26. -
early winter T 0.23. -