Fuel burning efficiency under various fire severities of a boreal forest landscape in north-east China
Fuel burning efficiency under various fire severities of a boreal forest landscape in north-east China
复制标题
DOI：
10.1071/wf20143
复制
发表时间：
2021-07
影响因子：
3.1
通讯作者：
Xiaoying Ping;Yu Chang;Miao Liu;Yuanman Hu;Zhelong Yuan;Sixue Shi;Yuxiang Jia;Dikang Li;Lili Yu
中科院分区：
文献类型：
--
作者：
Xiaoying Ping;Yu Chang;Miao Liu;Yuanman Hu;Zhelong Yuan;Sixue Shi;Yuxiang Jia;Dikang Li;Lili Yu
森林火灾是影响森林碳收支准确估计的重要自然扰动，主要原因是森林火灾产生的碳排放不确定。燃料燃烧效率是影响准确估计碳排放量的重要因素，并且难以量化。在这里，我们量化了燃烧效率的燃料层火灾的严重程度和森林类型，并调查了影响因素。可燃物层的燃烧效率随着火灾严重程度的增加而增加。乔木层在低、中、重度火灾下的燃烧效率较低，分别为0.76%、0.83%、6.84%。草本层的燃烧效率最高，达95%以上，其次是枯落物层，在49%~ 85%之间。虽然乔木层占地上燃料的最大碳储量，但火灾期间消耗的大部分碳来自灌木和草本层。在林分类型中，白皮松-落叶松林的地上可燃物燃烧效率明显高于其他两种林分。火灾天气指数（FWI）和温度对林下可燃物的燃烧效率有积极的影响。降水量对灌木和枯枝落叶燃烧效率的影响主要是负向的。
Forest fires are important natural disturbances that influence accurate estimations of forest carbon budgets, largely owing to the uncertainty of carbon emissions from forest fires. Fuel burning efficiency is an important factor affecting accurate estimations of carbon emissions and is difficult to quantify. Here, we quantified burning efficiencies of fuel strata by fire severity and forest types and investigated influencing factors. Burning efficiencies of fuel strata increased with increasing fire severity. The tree stratum had low values of burning efficiency of 0.76, 0.83, 6.84% under low-, moderate-, high-severity fires respectively. The burning efficiency of the herb stratum was the highest, over 95%, followed by the litter stratum between 49 and 85%. Although the tree stratum accounted for the largest carbon storage of aboveground fuels, most carbon consumed during fires came from the shrub and herb strata. Among forest types, the burning efficiency of aboveground fuels in Pinus pumila–Larix gmelinii forest was much higher than the other two studied. Fire Weather Index (FWI) and temperature exerted a positive effect on the burning efficiency of understorey fuels. Precipitation mainly had a negative influence on the burning efficiency of shrub and duff.