Open AccessNon-microbial methane emissions from tropical rainforest soils under different conditions
Author(s) -
Gaohui Jia,
Qinli Yang,
Huai Yang,
Yuwei Jiang,
Wenjie Liu,
Tingting Wu,
MingYong Han,
Tianyan Su,
Zhenghong Tan,
Wang Xu,
Juelei Li
Publication year - 2021
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0255725
Subject(s) - incubation , soil water , environmental chemistry , environmental science , chemistry , rainforest , soil carbon , tropical rainforest , carbon cycle , ecology , ecosystem , soil science , biology , biochemistry
Non-microbial methane (NM-CH 4 ), emissions from soil might play a significant role in carbon cycling and global climate change. However, the production mechanisms and emission potential of soil NM-CH 4 from tropical rainforest remain highly uncertain. In order to explore the laws and characteristics of NM-CH 4 emission from tropical rainforest soils. Incubation experiments at different environmental conditions (temperatures, soil water contents, hydrogen peroxide) and for soils with different soil organic carbon (SOC) contents were conducted to investigate the NM-CH 4 emission characteristics and its influence factors of soils (0-10cm) that collected from a tropical rainforest in Hainan, China. Incubation results illustrated that soil NM-CH 4 release showed a linear increase with the incubation time in the first 24 hours at 70 °C, whereas the logarithmic curve increase was found in 192 h incubation. Soil NM-CH 4 emission rates under aerobic condition were significantly higher than that of under anaerobic condition at first 24 h incubation. The increasing of temperature, suitable soil water contents (0–100%), and hydrogen peroxide significantly promoted soil NM-CH 4 emission rates at the first 24 h incubation. However, excessive soil water contents (200%) inhibited soil NM-CH 4 emissions. According to the curve simulated from the NM-CH 4 emission rates and incubation time at 70 °C of aerobic condition, soil would no longer release NM-CH 4 after 229 h incubation. The NM-CH 4 emissions were positively corelated with SOC contents, and the average soil NM-CH 4 emission potential was about 6.91 ug per gram organic carbon in the tropical mountain rainforest. This study revealed that soils in the tropical rainforest could produce NM-CH 4 under certain environment conditions and it supported production mechanisms of thermal degradation and reactive oxygen species oxidation. Those results could provide a basic data for understanding the soil NM-CH 4 production mechanisms and its potential in the tropical rainforest.