PERMFILE67186

• Permit No: C1981028
• IBM Index Class Name: Permit File
• Doc Date: 6/15/2006
• Doc Name: Revegetation Success Criteria
• Section_Exhibit Name: Appendix TR-37
• Media Type: D
• Archive: No

• inflection points neaz 8.5 and 11.5 inches of precipitation. The calculated correlation
coefficient is 0.4781, with the best equation explaining less that fifty percent of the
variation in the data. Plotting total cover data from the individual reclamation years
reveals best-fit curves with correlations of one (Figure 18). Unlike the curves derived
from the older reclamation areas (1985, 1986, and 1987) for cover and precipitation, the
curves for the younger reclamation areas reveal that while the results from individual azeas
aze consistent, the overall response to precipitation is significantly broad in the younger
reclamation, explaining the poor correlation when these young reclamation areas aze
plotted together (Figure 17).
Total vegetation cover and September-July precipitation for the 1995, 1997, and 1998
reclamation azeas is shown collectively and individually in Figures 19 and 20. As with the
January-July plots, the collective plot reveals a third order polynomial as the best-fit curve
with two inflection points in the data range. A correlation coefficient of 0.4781 was
obtained for this data set. Again, individual plotting of the 1995, 1997, and 1998
reclamation azeas total vegetation cover and September-July precipitation shows
individual correlation coefficients significantly higher than the collective plot with second
and third order polynomials. While the plot of overall and individual reclamation area
responses to the precipitation regimes reveals best-fit curves consistent with that expected,
the variability of the younger reclamation areas is evident in the low overall correlation
coefficient.
• Total Herbaceous Production
The results of curve fitting for the two precipitation regimes and total herbaceous
production for the 1985, 1986, and 1987 reclamation areas are found in Figures 21
through 24.
The plot of January-July precipitation and total herbaceous production data from the
1995, 1997, and 1998 reclamation areas from 1998-2001 is depicted in Figure 21. The
closest fit curve is a third order polynomial with a high correlation coefficient
(RZ= 0.8583). As was the case with cover data, this represents a significant improvement
in the explanation of variation from that of the closest fit curve for all reclamation azeas
and total herbaceous production (R2= 0,7396, Figure 4). Figure 22 depicts the best-fit
curves for the 1995, 1997, and 1998 reclamation azeas data individually and as with total
cover in the younger reclamation areas, variation in the individual reclamation areas is
great in terms of curve type, shape, and general form of the best-fit curve. The best-fit
curve for the 1995 reclamation area is a third order polynomial, for the 1997 reclamation
azeas an exponential, and the 1998 reclamation areas a straight line. Correlation
coefficients for the 1995, 1997, and 1998 areas varied widely, from one in the 1995
reclamation azeas to 0.135 in the 1998 reclamation azeas. As with the cover plotting
described above, this result is indicative of the wide variation in response of the younger
vegetation in these reclamation areas.

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