| 廖添怀,李欢,王艳玲.稻秆及稻秆生物炭添加对稻田红壤有机碳组分及CH4和CO2累积排放量的影响[J].农业环境科学学报,2022,41(7):1598-1609. |
| 稻秆及稻秆生物炭添加对稻田红壤有机碳组分及CH4和CO2累积排放量的影响 |
| Effects of addition of rice straw and rice straw biochar on soil organic carbon fractions and cumulative emissions of CH4 and CO2 in reddish paddy soil |
| 投稿时间：2021-11-29 |
| DOI：10.11654/jaes.2021-1381 |
| 中文关键词: 稻秆生物炭 稻田红壤 颗粒态有机碳 矿物结合态有机碳 可溶性有机碳 温室气体 |
| 英文关键词: rice straw biochar reddish paddy soil particulate organic carbon mineral-associated organic carbon dissolved organic carbon greenhouse gases |
| 基金项目:国家自然科学基金项目(42077087) |
|
| 摘要点击次数: 992 |
| 全文下载次数: 1024 |
| 中文摘要: |
| 为明确稻秆生物炭添加对稻田红壤有机碳组分及CH4和CO2累积排放量的影响过程与机制,本研究以稻田红壤为对象,通过室内培养试验,按土壤质量的1%等碳添加量设置对照(CK)、稻秆(RS)及300、400℃和500℃下制备的稻秆生物炭(RSB300、RSB400、RSB500)5个处理,对比分析了稻秆及稻秆生物炭添加0、30 d与120 d时,稻田红壤中可溶性有机碳(DOC)、总有机碳(TOC)、游离态粗颗粒有机碳(fcPOC)、游离态细颗粒有机碳(ffPOC)、闭蓄态颗粒有机碳(oPOC)、游离态矿物结合态有机碳(fMOC)及闭蓄态矿物结合态有机碳(oMOC)的变化差异,并探讨了稻田红壤CH4和CO2累积排放量与各有机碳组分含量的相关关系。结果表明:稻秆生物炭添加后稻田红壤中DOC、TOC、fcPOC、ffPOC、oPOC和fMOC含量均显著增加;其中,oPOC与oMOC含量随着培养时间的增加而显著增加,但fcPOC与fMOC含量则显著降低(P<0.05)。与CK处理相比,RS处理的稻田红壤中CH4和CO2的累积排放量均显著且持续增加;RSB各处理的稻田红壤中CO2的累积排放量显著降低;只有RSB300和RSB400处理的稻田红壤中CH4的累积排放量显著增加,且在培养120 d时分别增加了188.5%和32.7%(P<0.05)。相关性分析表明,添加稻秆及稻秆生物炭的稻田红壤中CH4和CO2累积排放量虽与DOC、ffPOC和fcPOC含量均呈极显著正相关关系,但其中DOC和fcPOC含量起主导作用(P<0.01)。研究表明,添加稻秆生物炭可以有效提高稻田红壤中各有机碳组分的含量与稳定性,且500℃热解制备的稻秆生物炭添加对稻田红壤中CH4、CO2累积排放量抑制效果最好。 |
| 英文摘要: |
| Clarifying the influence of rice straw biochar addition on soil organic carbon fractions and cumulative emissions of CH4 and CO2 and the associated underlying mechanisms could provide scientific basis for carbon sequestration and mitigation of CH4 and CO2 emissions in reddish paddy soil. In this study, a reddish paddy soil was used in an indoor incubation experiment with five soil amendment treatments:control (CK), rice straw (RS), and rice straw biochar prepared at 300, 400℃, and 500℃ (RSB300, RSB400, RSB500, respectively). These soil amendments were applied at the rate equivalent to 1% carbon addition to soil, based on soil weight. Differences in soil dissolved organic carbon (DOC), total organic carbon (TOC), free coarse particulate organic carbon (fcPOC), free fine particulate organic carbon (ffPOC), occluded particulate organic carbon (oPOC), free mineral-associated organic carbon (fMOC), and occluded mineral-associated organic carbon (oMOC) were analyzed after 0, 30 d, and 120 d of incubation. Correlations between cumulative emissions of CH4 and CO2 and various soil organic carbon fractions were also discussed. The results showed that DOC, TOC, fcPOC, ffPOC, oPOC, and fMOC contents were significantly increased in reddish paddy soil after rice straw biochar addition. With the increase in incubation time, oPOC and oMOC contents significantly increased, but fcPOC and fMOC contents significantly decreased. Compared with the CK treatment group, cumulative emissions of CH4 and CO2 in reddish paddy soil in the RS treatment group significantly and continuously increased. However, cumulative emissions of CO2 in reddish paddy soil in the RSB500 treatment group significantly decreased. In constrast, it increased in RSB300 and RSB400 treatment groups, with cumulative emission of CH4 in these treatment groups after 120 d of incubation increasing by 188.5% and 32.7%, respectively. Correlation analysis showed that cumulative emissions of CH4 and CO2 were significantly positively correlated with DOC, ffPOC, and fcPOC contents in reddish paddy soil after RS and RSB additions, but were mainly influenced by DOC and fcPOC (P< 0.01). Therefore, the addition of rice straw biochar can effectively improve the quantity and stability of soil organic carbon fractions in reddish paddy soil. Addition of rice straw biochar with pyrolysis at 500℃ exhibited the most remarkable inhibitory effect on cumulative emissions of CH4 and CO2 in this soil. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
