...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Science of the total environment >Impacts of bark beetle-induced tree mortality on pyrogenic carbon production and heat output in wildfires for fire modeling and global carbon accounting
【24h】

Impacts of bark beetle-induced tree mortality on pyrogenic carbon production and heat output in wildfires for fire modeling and global carbon accounting

机译：树皮甲虫诱导的树质死亡对火灾建模和全球碳核算的野火中热原碳生产和热输出的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Forests store significant quantities of carbon, and accurate quantification of the fate of this carbon after fire is necessary for global carbon accounting. Pyrogenic carbon (PyC) encompasses various carbonaceous products of incomplete combustion formed during fires and has potential to act as a carbon sink for up to millennia, but current estimates of PyC production in wildfires vary widely. Northern hardwood forests have changed dramatically in recent decades due to insect epidemics, such as the bark beetle epidemic in the Rocky Mountain Region which has caused widespread mortality. This study assessed impacts of bark beetle-induced mortality on fuel pyrolysis kinetics, carbon partitioning of combustion products, and net heat output to aid in forest fire modeling and carbon accounting by comparing healthy and beetle-killed lodgepole pine tree boles burned in a 2018 forest fire in southeast Wyoming, USA with unburned boles. Results showed charring predominantly restricted to the bark and cambium. Significant differences between burned and unburned healthy and beetle-impacted bark/cambium compositions were identified, and PyC production and energy output were quantified. Charring extent and PyC content were found to be greater in beetle-impacted boles due to a reduction in bark/cambium resistance to heating and charring, with 80 times more PyC produced in a beetle-killed bark/cambium than in a healthy bark/cambium. Upon scale-up, total PyC production in the fire-affected area was estimated to be 0.71 GgPyC (82.5 kgPyC/ha). This was found to be significantly enhanced compared to an estimated PyC production of 0.036 GgPyC (4.12 kgPyC/ha) in a hypothetical healthy lodgepole pine ecosystem of equal area. The results of this investigation concluded that the 58% beetle-induced mortality in the Badger Creek Fire area resulted in 3 times more carbon released to the global atmosphere, 20 times more PyC retained onsite and 32% greater heat output during wildfire.
机译：森林储存大量的碳，在全球碳核算后需要准确地定量该碳的命运。热原碳（PYC）包括在火灾期间形成的不完全燃烧的各种碳质产物，并且潜力充当碳汇，达到千年，但目前对野火的PYC生产的估计变化很大。由于昆虫流行病，北部硬木森林已经发生巨大地发生了变化，例如落在岩石山区的树皮甲虫疫情，这导致了普遍的死亡率。本研究评估了树皮甲虫诱导的死亡率对燃料热解动力学，燃烧产物的碳分配，以及通过比较2018年森林烧毁的健康和甲虫杀死的小屋松树骨，净热量输出燃烧产物的碳分配，净热量，以帮助森林射击和碳核算在东南怀俄明州的火灾，美国有未燃烧的Boles。结果表明，炭化主要限制在树皮和卡宾中。鉴定出烧伤和未燃烧的健康和甲虫撞击的树皮/嵌合组合物之间的显着差异，量化了Pyc生产和能量输出。由于甲虫/盲肠抗性和炭化的抗性降低，发现甲虫冲击的硼在甲虫冲击的骨中含有收费程度和脓性含量，并且在甲虫 - 杀死的树皮/镶嵌中产生的80倍，而不是健康的树皮/粘合剂。在扩大方案时，估计火灾影响地区的PYC生产总量为0.71 GGPYC（82.5 kgpyc / ha）。与估计的Pyc产量为0.036 Ggpyc（4.12kgpyc / ha）的估计的健康的地区的估计的Poledpole杉木生态系统相比，这被发现明显增强。本调查结果得出结论，獾溪火灾区的58％甲虫诱导的死亡率导致全球气氛中释放的3倍，猪岩石的20倍，野火期间的热量增加了32％。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号