Fire History of a Larch Forest and Its Relationship with Drought in Mangui of Daxing' an Mountains, China
A 257-year forest fire chronology was built by using 16 cross-dated tree-ring fire scar discs of Larix gmelinii in Mangui of the northern Daxing' an Mountains, China. All fire-scar data were input and analyzed using software FHX2. Results showed that the mean fire interval of L. gmelinii forest in Mangui was 26.3 a, and the number of years per fire was 44.8 a. The major type of forest fires in this area was earlywood fire, which accounts for 86.3% of all fires. The proportion attributed to latewood fire and dormant fire was rather small, only 13.7%. Furthermore, the climate-driven mechanism of forest fires in Mangui was analyzed. Palmer Drought Severity Index ( PDSI) was significant at the 95% confidence interval at fire year by using superposed epoch analysis. In other words, the possibility of forest fire occurrences in Mangui increased as climates became dry. The relatively humid climates in the years before fires were also a prerequisites for fire occurrences. Moreover, a long-term drought might lead to a huge forest fire. Anthropogenic activities and national policies would also affect fire regime in long-term scales.
Daxing' an MountainsFire historyLarix gmeliniiTree ringsDrought
NETL
NSTL
万方数据
维普
