Ecological Archives E086-033-A4

Daniel M. Kashian, Monica G. Turner, William H. Romme, and Craig G. Lorimer. 2005. Variability and convergence in stand structural development on a fire-dominated subalpine landscape. Ecology 86:643–654.

Appendix D. Mean values of the Palmer Drought Severity Index (PDSI) for the Yellowstone region for each of the five-year periods over which ring widths were regressed against stand density.

Model age
300 years
220 years
125 years
70 years
12 years
           
300 years
***
1918–1922
1823–1827
1768–1772
1710–1714
220 years
0.118
***
1903–1907
1848–1852
1790–1794
125 years
0.194
-0.120
***
1943–1949
1885–1889
70 years
1.520
-0.249
-0.249
***
1940–1944
12 years
-0.062
0.459
1.228
-0.327
***

   Notes: Values above the diagonal represent the periods for which the PDSI is reported in the corresponding cells below the diagonal. Positive values of the PDSI represent weather wetter than normal; negative values indicate weather drier than normal. Mean PDSI for the period of 1700–1995 was 0.234 (SD = 1.855).



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