Ecological Archives E096-166-A3
Sharon Hood, Anna Sala, Emily K. Heyerdahl, and Marion Boutin. 2015. Low-severity fire increases tree defense against bark beetle attacks. Ecology 96:1556–1565. http://dx.doi.org/10.1890/14-0487.1
Appendix C. Model statistics comparing total duct area before and after one fire, before and after frequent fire, and with climate.
Table C1. Model results comparing total duct area (mm2 year-1) before and after one fire, before and after frequent fire, and with climate. One fire: Montana and Utah sites, where fire = burned and unburned; time = before fire and after fire; ring area = ring width*increment core diameter. Frequent fire: Idaho and Oregon sites, where fire = fires excluded, fires not excluded; period = before and after fire exclusion; ring area = ring width * increment core diameter. PPT_depart = departure from 30-year normal July precipitation. Tmax_depart = departure from 30-yearnormal July maximum temperature. 30-year normal = 1981–2010.
Effect |
df |
|
P value |
||
Duct Response to One Fire |
|||||
Montana |
|||||
Time |
25 |
0 |
0.9594 |
||
Fire |
25 |
33.04 |
<.0001 |
||
Fire * Time |
25 |
7.45 |
0.0115 |
||
Ring area |
25 |
17.56 |
0.0003 |
||
Utah |
|||||
Time |
12 |
10.49 |
0.0822 |
||
Fire |
12 |
3.60 |
0.0071 |
||
Fire * Time |
12 |
3.04 |
0.1065 |
||
Ring area |
12 |
6.03 |
0.0303 |
||
Duct Response to Frequent, Low-severity Fire |
|||||
Idaho |
|||||
Fire |
14 |
10.30 |
0.0063 |
||
Period |
14 |
10.60 |
0.0057 |
||
Fire * Period |
14 |
8.76 |
0.0104 |
||
Ring area |
4795 |
1177.47 |
<0.0001 |
||
Oregon |
|||||
Period |
4 |
10.07 |
0.0338 |
||
Ring area |
871 |
68.79 |
<0.0001 |
||
Duct Response to Climate |
|||||
PPT_depart |
65 |
15.68 |
0.0002 |
||
Tmax_depart |
65 |
12.79 |
0.0007 |
||
PPT_depar*Tmax_depar |
65 |
1.24 |
0.2692 |
||