秸秆沟埋还田对稻田产甲烷菌群功能的影响
毕业论文关键词：秸秆沟埋还田；产甲烷菌群；稻田；相对贡献率；
Effects of ditch-buried straw return on methane production inpaddy fieldAbstract：Ditch-buried straw return (DB-SR) is a new type of soil tillage practice. Previous studies havefound that DB-SR can change the process of carbon and nitrogen cycling. However, it is not clear whetherthe effect of DB-SR on the function of methanogenic bacteria. The relative contribution of different soilconditions in paddy field determination of methanogens CH4 production capacity and reduction of H2/CO2pathway and CH3COOH pathway through the oxidation rate of incubation of DB-SR effect onMethanogens function, in order to reveal the regulatory mechanism of straw burying straw on CH4emission from paddy field. Three single factor experiments were designed, including buried depth (CK, 20cm, 30 cm and 40 cm), returning amount (CK, half, full and double amounts) and returning methods (CK,rotary tillage, ditch-buried by machine and manual operation). Our results showed that the 0-10 cm surfacesoil samples, CH4 production capacity was the weakest for the burial depth of 30 cm treatment, and therelative contribution of acetic acid oxidation pathway was the smallest; for the buried amount treatments,CH4 production capacity is higher for the full amount treatment than that of other treatments, and therelative contribution of H2/CO2 reduction was greater than other two burial amount treatments. Fordifferent straw returning modes, CH4 production capacity was lower for straw incorporation with rotarytillage than that of other treatments, and the relative contribution of CH3COOH oxidation pathway was thesmallest. In summary, theCH4 production capacity of methanogens was the weakest when full amounts ofstraws were buried at a depth of 30 cm, which indicated that this technique could effectively control theCH4 emission.Key words: Ditch-buried straw return; Methanogenic bacteria;Paddy field; Relative contribution
目 录
摘要1
关键词1
Abstract1
Key words1
引言 1
1 材料与方法2
1.1 材料及实验地情况 2
1.2 实验设计 2
1.3 实验方法 3
131 取样方法3
132 测定方法3
1.3.3 数据分析3
2 结果与分析3
2. 1 沟埋深度3
2.1.1 CH4产生能力分析.3
2.1.2 沟埋深度对 CH4产生途径的影响4
22 还田量5
2.2.1 CH4产生能力分析5
2.2.2 还田量对 CH4产生途径的影响5
23 还田方式6
2.3.1 CH4产生能力分析6
2.3.2 还田方式对 CH4产生途径的影响6
3 讨论 7
3.1 沟埋深度对稻田产甲烷菌群功能的影响7
3.2 还田量对稻田产甲烷菌群功能的影响7