Association Between Association Between DOM Composition
Characteristics and CH4 Emission of Chinese Milk Vetch
Amended Under Different Water Management
LIU Han1, 2, MA Ting-ting1, WAN Li1, CHEN Xiao-fen1, ZHOU Guo-peng3, SUN Jin-xin3, ZHU An-fan4, LI Yan-li2, LIU Jia1*
1. Soil and Fertilizer & Resources and Environment Institute, Jiangxi Academy of Agricultural Sciences, National Engineering & Technology Research Center for Red Soil Improvement, Key Laboratory of Acidified Soil Amelioration and Utilization, Ministry of Agriculture and Rural Affairs, Nanchang 330200, China
2. College of Agriculture, Yangtze University, Jingzhou 434025, China
3. State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
4. Agricultural Technology Promotion Center of Jiangxi Province, Nanchang 330046, China
Abstract：In order to study the relationship between the composition and structure of dissolved organic matter (DOM) and methane (CH4) emissions in the paddy soil with Chinese milk vetch returning under different water managements (flooding after a short time delay), we set an incubation experiment, with no green manure and no tillage (DW-0) as control, different water management treatments (immediately flooding, flooding after 5 and 10 days) were set up, three-dimensional fluorescence spectroscopy (3DEEM) and parallel factor analysis (PARAFAC) were used to assess the effects of soil DOM composition and the effect of fluorescence spectra on CH4 emissions. The results showed that both DOM content and cumulative CH4 emissions significantly decreased under G+DW-5 treatment, and both DOM content and cumulative CH4 emissions increased with the extension of dry tillage time. Three fluorescence components, including fulvic-like (C1), humic-like (C2), and protein-like (C3), were obtained by the 3DEEM-PARAFAC method. There were significant differences in the fluorescence components of soil DOM under different water management practices. The highest content of humus-like components (C1+C2) was found in soil DOM under the G+DW-5 treatment, which reached 79.88%, and the restricted principal component analysis indicated that soil DOM components were significantly different under different water management. The DOM Humification Index (HIX) of G+DW-5 was 5.11, significantly higher than other treatments. The correlation analysis showed that CH4 emissions were negatively correlated with the C1 and HIX index but positively correlated with the C2 and BIX index; the results showed that flooding after a short time delay could reduce CH4 emissions by increasing the content of C1 and the level of soil DOM humification. Overall, the composition and structure of DOM in the paddy soil under different water managements are closely related to CH4 emissions, which could provide a scientific basis for reducing CH4 emissions from paddy soil.
Key words：Green manner; Flooding after a short time delay; Methane; Dissolved organic matter;Three-dimensional excitation-emission matrices; Parallel factor analysis
刘 晗，马停停，万 里，陈晓芬，周国朋，孙晋鑫，朱安繁，李燕丽，刘 佳. 不同干耕措施下紫云英还田水稻土中DOM组成特征与CH4排放的关联[J]. 光谱学与光谱分析, 2024, 44(12): 3435-3442.
LIU Han, MA Ting-ting, WAN Li, CHEN Xiao-fen, ZHOU Guo-peng, SUN Jin-xin, ZHU An-fan, LI Yan-li, LIU Jia. Association Between Association Between DOM Composition
Characteristics and CH4 Emission of Chinese Milk Vetch
Amended Under Different Water Management. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(12): 3435-3442.
