Differences in C, N, δ13C, and δ15N among plant functional types after a wildfire in a black spruce forest, interior Alaska
Differences in C, N, δ13C, and δ15N among plant functional types after a wildfire in a black spruce forest, interior Alaska
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阿拉斯加内陆黑云杉林野火后植物功能类型之间 C、N、δ13C 和 δ15N 的差异
DOI：
10.1139/cjfr-2021-0134
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发表时间：
2022
影响因子：
2.2
通讯作者：
Sawada Yuki
中科院分区：
文献类型：
--
作者：
Tsuyuzaki Shiro;Kwon TaeOh;Takeuchi Fumiko;Otaki Michiru;Sawada Yuki
我们测量的差异%C，%N，δ 13 C，和δ 15 N的植物功能类型（PFT）之间燃烧和未燃烧的地面后不久，在阿拉斯加内陆的一个朝北的斜坡野火。结果表明：δ 13 C在不同的PFT中存在差异，乔木和灌木的δ 13 C较低，说明木本植物的C动态较慢或水分利用效率较低; δ 15 N含量表明草本植物对菌根的依赖程度较低，在火烧后的表面上，菌根的作用减弱。灌木叶片的δ 15 N值最低，而火烧面的δ 15 N值较高，说明火烧减缓了土壤氮向灌木叶片的转移。泥炭凋落物在火烧迹地的分解速度较快，火烧迹地和未火烧迹地凋落物中的%N和δ 15 N含量从第2年到第3年都有所增加，而%C含量变化不大。总之，野火的反应不同的PFT的特点是他们的C和N动态。
We measured differences in %C, %N,δ13C, andδ15N of plant functional types (PFTs) between burned and unburned ground surfaces soon after a wildfire on a north-facing slope in interior Alaska. The C and N were measured for 16 species andSphagnumlitter.δ13C differed among the PFTs and was low for trees and shrubs, suggesting that woody stems slowed C dynamics or showed low water use efficiency.δ15N concentrations suggested that the herbaceous plants depended less on the mycorrhizal associations that became weak on the burned surfaces. The shrub leaves showed the lowestδ15N of PFTs and showed higherδ15N on the burned surface, showing that N transfer from the soils to the leaves in the shrubs was slowed by the wildfire. Mosses showed the highest C/N ratio.Sphagnumlitter decomposed faster on the burned surface, and %N andδ15N in the litter increased from the second to third year on both burned and unburned surfaces, while %C changed little. In conclusion, the responses to the wildfire differed among the PFTs as characterized by their C and N dynamics.