Effects of biochar on CH4 emission with straw application on paddy soil
Effects of biochar on CH4 emission with straw application on paddy soil
复制标题
稻田秸秆还田生物炭对CH4排放的影响
DOI：
10.1007/s11368-017-1761-x
复制
发表时间：
2018-02-01
影响因子：
3.6
通讯作者：
Zhu, Lizhong
中科院分区：
文献类型：
--
作者：
Cai, Fei;Feng, Zhengjun;Zhu, Lizhong
秸秆还田是水稻土改良土壤质量的一种常用农业措施，但秸秆还田会导致甲烷（CH4）排放量增加。生物质炭在土壤中的应用是一种具有吸引力的固碳减排方法。本研究旨在探讨秸秆还田条件下生物质炭对稻田土壤甲烷排放的影响。材料与方法本研究采用低温生物质炭（BC300）和高温生物质炭（BC500和BC700），在有秸秆和无秸秆的条件下进行培养。在整个实验室培养期间监测土壤CH4通量。测定了土壤的pH值、氧化还原电位（Eh）和溶解有机碳（DOC）。结果与讨论在不施用秸秆的情况下，低温生物炭降低了土壤Eh，增加了产甲烷古菌的丰度，促进了CH4的排放，而高温生物炭对CH4的排放影响不大。秸秆还田时，生物炭通过降低产甲烷古菌的有效碳含量来抑制甲烷的排放。高温生物炭的抑制作用强于低温生物炭。结论生物炭种类和秸秆施用量对CH4排放均有影响。秸秆还田时，生物质炭能显著降低稻田CH4排放，高温生物质炭的降低作用强于低温生物质炭。
PurposeStraw incorporation, a common agricultural practice for improving soil quality in paddy soil, leads to the increase of methane (CH4) emission. Application of biochar in soil is an attractive method to sequestrate carbon and reduce the emission of greenhouse gas. This study aimed at exploring the effect of biochar on CH4 emission in the paddy soil with straw incorporation.Materials and methodsIn this study, the low-temperature biochar (BC300) and high-temperature biochar (BC500 and BC700) were incubated with or without straw in soil. Soil CH4 fluxes were monitored during the whole period of laboratory incubation. Soil properties were measured, including pH, redox potential (Eh) and dissolved organic carbon (DOC). The abundance and composition of methanogenic archaeal and methanotrophic bacterial communities were analyzed by real-time quantitative PCR (qPCR) and high-throughput sequencing, respectively.Results and discussionWhen no straw was applied, low-temperature biochar decreased soil Eh, increased the abundances of methanogenic archaea, and thus promoted the emission of CH4, while high-temperature biochar had little effect on CH4 emission. When straw was applied, biochar inhibited CH4 emission by decreasing the content of available carbon for methanogenic archaea. The inhibition effect of high-temperature biochar was stronger than that of low-temperature biochar.ConclusionsThe results indicated that CH4 emission was affected by both biochar type and straw application. Biochar could significantly decrease CH4 emission when straw was returned to paddy soil, and the decrease induced by high-temperature biochar was stronger than that of low-temperature biochar.