The Scientific World Journal / 2014 / Article / Tab 2

Research Article

The Impact of Precipitation Regimes on Forest Fires in Yunnan Province, Southwest China

Table 2

Mann-Whitney test for the number of fires and area burned in Yunnan province during the two periods (1982–1988, 1989–2008).

Number of firesIIIIIIIVV

Period of 1982–1989225 (42)982 (377)1651 (734)76 (90)37 (43)
Period of 1990–200845 (37)91 (44)228 (103)18 (11)9 (7)
Change of mean (%)−80−90.7−86.2−76.3−75.7
0.0000.0000.0001928
Significance level

Burned area (ha)IIIIIIIVV

Period of 1982–19899189 (4439)20395 (15962)32410 (26562)176 (143)2799 (6189)
Period of 1990–20081121 (1068)1709 (1067)5687 (6428)85 (78)290 (521)
Change of mean (%)−87.8−91.6−82.5−51.7−89.6
0.0000.00076138
Significance level