تقرير
Alaska's Changing Fire Regime - Implications for the Vulnerability of Its Boreal Forests
| العنوان: | Alaska's Changing Fire Regime - Implications for the Vulnerability of Its Boreal Forests |
|---|---|
| المؤلفون: | Kasischke, E. S, Hoy, E. E, Verbyla, D. L, Rupp, T. S, Duffy, P. A, McGuire, A. D, Murphy, K. A, Jandt, R, Barnes, J. L, Calef, M, Turetsky, M. R |
| المصدر: | Canadian Journal of Forest Research. 40 |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2010. |
| سنة النشر: | 2010 |
| مصطلحات موضوعية: | Earth Resources And Remote Sensing |
| الوصف: | A synthesis was carried out to examine Alaska s boreal forest fire regime. During the 2000s, an average of 767 000 ha/year burned, 50% higher than in any previous decade since the 1940s. Over the past 60 years, there was a decrease in the number of lightning-ignited fires, an increase in extreme lightning-ignited fire events, an increase in human-ignited fires, and a decrease in the number of extreme human-ignited fire events. The fraction of area burned from humanignited fires fell from 26% for the 1950s and 1960s to 5% for the 1990s and 2000s, a result from the change in fire policy that gave the highest suppression priorities to fire events that occurred near human settlements. The amount of area burned during late-season fires increased over the past two decades. Deeper burning of surface organic layers in black spruce (Picea mariana (Mill.) BSP) forests occurred during late-growing-season fires and on more well-drained sites. These trends all point to black spruce forests becoming increasingly vulnerable to the combined changes of key characteristics of Alaska s fire regime, except on poorly drained sites, which are resistant to deep burning. The implications of these fire regime changes to the vulnerability and resilience of Alaska s boreal forests and land and fire management are discussed. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| DOI: | 10.1139/X10-098 |
| URL الوصول: | https://ntrs.nasa.gov/citations/20110002892 |
| ملاحظات: | NNX06AF85G NNG04GD25G PNW01-JV11261952-231 CSREES 2008-35615-18959 NSF DEB-0423442 |
| رقم الأكسشن: | edsnas.20110002892 |
| قاعدة البيانات: | NASA Technical Reports |
| DOI: | 10.1139/X10-098 |
|---|