Transformation of humic substances and functional groups of soil organic carbon after wildfire. Issue 1 (2nd January 2021)

• Record Type: Journal Article
• Authors: Yue, Xin; Li, Shimei; Hussain, Qaiser; Jin, Shengai; Liu, Qinghua; Cui, Dejie; Song, Xiangyun
• Is Part Of: Archives of agronomy and soil science. Volume 67:Issue 1(2021)
• Page Start: 29
• Page End: 37
• Publication Date: 2021-01-02
• Subjects: Carbon sequestration -- humic substances -- 13C NMR spec troscopy -- wildfire -- forest soil; Horticulture -- Periodicals; Soils -- Periodicals; 630.5
• DOI: 10.1080/03650340.2019.1702165
• Languages: English
• ISSNs: 0365-0340

Abstract

ABSTRACT: The composition of humic substances and structural diversity of soil organic carbon (SOC) can be affected by wildfire. In this study, soil samples were collected after 1 year of no fire, low intensity of fire (dead trees ≤ 30%), moderate intensity of fire (dead trees 30–70%) and high intensity of fire (dead trees ≥ 70%). The amounts of humic acid (HA), fulvic acid (FA) and humin (Hu) were investigated, and the characteristics of SOC were analyzed by 13 C NMR spectroscopy too. The results showed that Hu decreased much more than HA and FA after fires, but it still contained more C than HA and FA. There was a positive correlation between the contents of SOC and Hu ( R 2 = 0.96, p = 0.02). Aryl C of SOC decreased with the heavy intensity of fire, while alkyl C increased in converse. These results indicate that Hu loses more C than HA and FA with fires, while it is still the main component of SOC. The Alkyl C is more stable than aryl C in fires.