生物炭和镁肥对酸性茶园土壤气态碳释放的影响
Effects of biochar and magnesium fertilizer on gaseous carbon release from an acidic tea garden soil
张峻川 1李强 2刘越 1刘学梅 1罗欣悦 1王义祥 3易志刚1
作者信息
- 1. 福建农林大学资源与环境学院,福州 350002
- 2. 福建农林大学资源与环境学院,福州 350002;福建省红壤山地农业生态过程重点实验室,福州 350013
- 3. 福建省农业科学院资源环境与土壤肥料研究所,福州 350013;福建省红壤山地农业生态过程重点实验室,福州 350013
- 折叠
摘要
为探究生物炭和镁肥添加对土壤气态碳通量的影响,深入理解土壤碳去向,本研究以连续两年施肥的酸性茶园土壤为研究对象,设置常规施肥(CK)、施加生物炭(BC)、施加镁肥(MG)、生物炭和镁肥混施(MGBC)4个处理,采集土壤和凋落叶进行6个月室内培养试验,研究生物炭和镁肥对酸性茶园土壤气态碳释放和土壤微生物量碳的影响.结果表明:有凋落叶时,生物炭可增加土壤CO2和CH4的释放量,试验结束时CO2-C和CH4-C累积排放量分别为(484.80±58.74)g·m-2和(135.76±12.05)mg·m-2;施加镁肥降低了土壤CO2和CH4的释放量,CO2-C和CH4-C累积排放量分别为(255.80±4.55)g·m-2和(76.63±4.11)mg·m-2.无凋落叶时,MGBC处理对土壤CO2释放的促进作用最大,CO2-C累积排放量为(136.74±5.03)g·m-2;生物炭和镁肥均促进了土壤挥发性有机物形态的碳(VOCs-C)的释放,其中镁肥的促进作用最大,VOCs-C累积排放量增幅23.82%.整体而言,生物炭促进而镁肥抑制了酸性茶园土壤碳释放,生物炭镁肥混施对无凋落叶土壤气态碳的释放促进最大.VOCs-C在气态碳中占比虽然小,但较CH4-C的通量略高,故不可忽略.
Abstract
To explore the effects of biochar and magnesium fertilizer additions on soil gaseous carbon fluxes and to gain a deeper understanding where carbon goes in the soil,four treatments,namely conventional fertilization(CK),additional biochar application(BC),additional magnesium fertilizer application(MG),and additional biochar and magnesium fertilizer application(MGBC)were used in acid tea garden soil for two years in this study,and then soil and leaf litter were collected from the treatments and used in an indoor culture experiment for over months.The effects of biochar and magnesium fertilizer on gaseous carbon release and soil microbial biomass carbon in the acidic tea garden soil were studied.The results showed that:For soil with leaf litter treatment,biochar increase the release of CO2 and CH4,and cumulative emissions of CO2-C and CH4-C at the end of the experiment were(484.80±58.74)g·m-2 and(135.76±12.05)mg·m-2 respectively.Magnesium fertilizer reduced the release of soil CO2 and CH4,with cumulative emissions of CO2-C and CH4-C of(255.80±4.55)g·m-2 and(76.63±4.11)mg·m-2 respectively.For soil without leaf litter treatment,MGBC treatment had the greatest effect on soil CO2 release,and the cumulative CO2-C emission was(136.74±5.03)g·m-2.In this study,both biochar and magnesium fertilizers promoted the release of soil VOCs-C,with magnesium fertilizer increasing cumulative emissions by 23.82% .Overall,biochar promoted soil carbon release while magnesium fertilizer inhibited it co-application of biochar and magnesium fertilizer without litter had the greatest effect on the release of soil gaseous carbon.Although the proportion of VOCs-C in gaseous carbon is small,its flux is slightly higher than that of CH4-C,and thus it cannot be ignored.
关键词
二氧化碳/甲烷/气态有机碳/温室气体/生物炭/酸性茶园Key words
carbon dioxide/methane/gaseous organic carbon/greenhouse gases/biochar/acidic tea garden引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据