生物炭添加对土壤冻融过程中温室气体排放的影响
发布时间：2018-12-29 07:53
【摘要】：【目的】研究模拟生物炭添加对土壤冻融过程中二氧化碳(CO_2)、甲烷(CH_4)和氧化亚氮(N_2O)排放的影响,为冻融期土壤温室气体的减排提供参考。【方法】以伊犁河谷典型农田为研究对象,野外采集原状土柱,并在室内模拟不同幅度的冻融过程(+5℃、-5℃~+5℃和-10℃~+10℃),探求冻融过程中土壤CO_2、CH_4和N_2O排放对生物炭添加(0、20和40 t/hm~2)的响应特征。【结果】与不添加生物炭的处理相比,添加生物炭会使冻融过程中的土壤CO_2排放量提高1.1~1.4倍,但该影响远小于冻融作用对土壤CO_2排放的促进作用(为CK的1.5~3.2倍);虽然冻融作用未显著(P0.05)影响土壤CH_4的累积排放量,但生物炭的添加显著(P0.05)促进了45.5%~81.8%的CH_4吸收量;冻融作用使土壤N_2O的累积排放量提高了1.3~3.0倍,生物炭降低了冻融过程中10.2%~30.9%的土壤N_2O排放量,但在多数情况下这种减小并不显著(P0.05)。【结论】模拟生物炭添加会增加土壤冻融过程中CO_2的排放,也会促进CH_4的吸收和N_2O的减排。
[Abstract]:[objective] to study the effects of simulated biochar on the emission of carbon dioxide (CO_2), methane (CH_4) and nitrous oxide (N2O) during soil freezing and thawing. [methods] the typical farmland of Yili River Valley was used as the research object, the undisturbed soil column was collected in the field, and the freezing and thawing process was simulated in laboratory (5 鈩，
本文编号：2394537
[Abstract]:[objective] to study the effects of simulated biochar on the emission of carbon dioxide (CO_2), methane (CH_4) and nitrous oxide (N2O) during soil freezing and thawing. [methods] the typical farmland of Yili River Valley was used as the research object, the undisturbed soil column was collected in the field, and the freezing and thawing process was simulated in laboratory (5 鈩，
本文编号：2394537
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