秸秆不同还田方式对旱地棕壤CO_2排放和土壤碳库管理指数的影响

Effects of different stover-incorporation ways on CO_2 emission in dryland brown soil and soil carbon pool management index

通过玉米种植田间试验,研究了玉米秸秆直接还田和炭化还田对旱地棕壤CO2排放及土壤碳库管理指数的影响。结果表明:与对照相比,秸秆直接还田和秸秆炭化还田均显著增加了土壤CO2的累积排放量,分别高于对照132%和76%;在同等化肥施用条件下,秸秆炭化还田比直接还田显著降低了土壤CO2的累积排放量,降幅为24%。与秸秆直接还田相比,生物炭的施入起到了良好的CO2减排效果。秸秆还田可以显著提升土壤碳库管理指数,与秸秆炭化还田相比,秸秆直接还田的效果更为显著。

A field experiment was conducted to investigate the effects of corn stover returning and biochar application on the CO2 emission and carbon pool management index （CPMI） in dryland brown soil. The results showed that both stover returning and biochar application increased the cumulative CO2 emission of soil significantly by 132% and 76%, respectively, compared with the control. Under the same level of fertilization, biochar application significantly decreased the cu- mulative emission of CO2 by 24% compared with stover returning. Biochar played a positive role in CO2 emission reduction, in contrast with stover direct returning. Stover returning significantly increased CPMI, and this effect of stover direct returning was more significant compared with bio- char application.