Path Model Analysis of Soil Methane Oxidation Potential in Different Subregional and Regional Scales
Key environmental factors affecting methane oxidation potential at different subregional and regional scales
Methane is the second most carbon dioxide-emitting greenhouse gas whose greenhouse effect is 28 times that of carbon dioxide. Methane-oxidizing bacteria in dryland soil oxidize methane, which is an important biological source of atmospheric methane. Previous studies have shown that climate, vegetation, soil physical and chemical properties and methane Oxidative bacterial community distribution will affect soil methane oxidation, but the main factors affecting methane oxidation potential in different regions are not yet clear.
Kou Yongping, a Ph.D. researcher at the Xiang Institute of Biology, Chinese Academy of Sciences, studied the factors affecting the methane oxidation potential in the grassland soils of Inner Mongolia, Xinjiang and Qinghai-Tibet Plateau, and studied the effects of methane oxidation potential in three different subregions (Inner Mongolia, Xinjiang and Tibetan Plateau) On the basis of comprehensive analysis of the relative contribution of geographic distance, environmental factors (climate, vegetation and soil physical and chemical properties) and the distribution of methane-oxidizing bacterial community to methane oxidation potential, the key factors influencing soil methane oxidation potential at different sub-regional and regional scales And analyzed its mechanism of impact.The results showed that the environmental factors had the highest degree of explanation for the methane oxidation potential compared with the geographical distance, but the key environmental factors affecting the methane oxidation potential were scale-dependent.At the whole regional scale, Is the key environmental factor that affects methane oxidation potential, which can affect soil methane oxidation potential by affecting plant growth and methane-oxidizing bacterial community distribution. Key environmental factors that affect methane oxidation potential of grassland in Inner Mongolia at different sub-regional scales Soil total organic carbon and soil texture, affecting the new The key environmental factors affecting the methane oxidation potential of grassland soil are the aridity and the average annual temperature.The key environmental factor that affects the methane oxidation potential of the grassland soil in the Qinghai-Tibet Plateau is the soil total nitrogen.The results contribute to the promotion of methane oxidation potential Prediction and understanding of the response to global climate change.
The research was supported by the Chinese Academy of Sciences strategic pilot science and technology project, the National Natural Science Foundation of China and China Biodiversity Monitoring Network (Sino BON) funding, published in Soil Biology & Biochemistry.
