生态环境学报2016，Vol.25Issue(6)：927-933,7.DOI:10.16258/j.cnki.1674-5906.2016.06.003
不同地区稻田土壤甲烷氧化碳同位素分馏特征及其影响因素研究
CH4 Oxidation Isotope Fractionation and the Influences in Rice Fields in Different Regions in China
摘要
Abstract
CH4 oxiddation is the natural regulation of CH4 emission in paddy soil. However, the CH4 oxiddation is influenced by many factors. Furthermore, rice planting is widely distributed in China, the differences in the environmental factors (such as the climate) and the field managements, should have impacts on the CH4 oxiddation processes and the stable carbon isotope fractionation of CH4 oxiddation. Hence, studies on the CH4 oxiddation and stable carbon isotope fractionation in paddy soils in different area, and clarify the main influences, are crucial for environmental protection and the global warming, and helpful to improve our knowledge in the principle of CH4 oxiddation in paddy soils. Trough aerobic incubations and stable carbon isotope method, this study investigated the CH4 oxidation potential, CH4 oxidation isotope fractionation and the influencing factors in the paddy soils, which differed dramatically in soil biochemical properties. These soil samples were collected from 6 major rice-producing regions of China, including the Ziyang city in Sichuan, Taoyuan city in Hunan, Yingtan city in Jiangxi, Jiaxing city in Zhejiang, Shenyang city in Liaoning and Leizhou city in Guangdong. Results showed that the CH4 oxidation potential for the soil from Ziyang (Sichuan) and Baodongyu (Hunan) were generally lower (about 1/6) than that for the other four soils. At the same time, the CH4 oxidation (13C) isotope fractionation factor (αox) differed apparently, and was significantly and negatively correlated to the CH4 oxidation potential, with the correlation being-0.85 and-0.81 when the soil water was 85%WHC and was 1∶1 soil water ratio, respectively. Moreover, the correlation analysis showed that, the CH4 oxidation potential was significantly and positively correlated to the concentration of soil active iron, with the r being 0.86 (P=0.042) and 0.90 (P=0.035) when the soil water was 85%WHC (85%of the soil water holding capacity) and soil-water ratio was 1∶1, respectively. Whereas, theαox was significantly and nagetively correlated to the active iron, and the r were-0.92 (P=0.026) when the soil water was 85%WHC (85%of the soil water holding capacity) and was 1∶1 soil-water ratio. The results indicated that the soil water content and the concentration of soil active iron were the key factors of CH4 oxiddation and stable carbon (13C) isotope fractionation in paddy soils. However, the underlying mechanisms need be further study.关键词
稻田土壤/甲烷排放/甲烷氧化/同位素分馏Key words
paddy soil/CH4 emission/CH4 oxidation/isotope fractionation分类
农业科技引用本文复制引用
张晓艳,徐华,马静,刘梅先..不同地区稻田土壤甲烷氧化碳同位素分馏特征及其影响因素研究[J].生态环境学报,2016,25(6):927-933,7.基金项目
国家自然科学基金项目（41601262）；土壤与农业可持续发展国家重点实验室开放基金项目 （）
