發(fā)布時間：2018-12-29 07:53

【摘要】：【目的】研究模擬生物炭添加對土壤凍融過程中二氧化碳(CO_2)、甲烷(CH_4)和氧化亞氮(N_2O)排放的影響,為凍融期土壤溫室氣體的減排提供參考�！痉椒ā恳砸晾绾庸鹊湫娃r(nóng)田為研究對象,野外采集原狀土柱,并在室內(nèi)模擬不同幅度的凍融過程(+5℃、-5℃~+5℃和-10℃~+10℃),探求凍融過程中土壤CO_2、CH_4和N_2O排放對生物炭添加(0、20和40 t/hm~2)的響應特征�！窘Y(jié)果】與不添加生物炭的處理相比,添加生物炭會使凍融過程中的土壤CO_2排放量提高1.1~1.4倍,但該影響遠小于凍融作用對土壤CO_2排放的促進作用(為CK的1.5~3.2倍);雖然凍融作用未顯著(P0.05)影響土壤CH_4的累積排放量,但生物炭的添加顯著(P0.05)促進了45.5%~81.8%的CH_4吸收量;凍融作用使土壤N_2O的累積排放量提高了1.3~3.0倍,生物炭降低了凍融過程中10.2%~30.9%的土壤N_2O排放量,但在多數(shù)情況下這種減小并不顯著(P0.05)�！窘Y(jié)論】模擬生物炭添加會增加土壤凍融過程中CO_2的排放,也會促進CH_4的吸收和N_2O的減排。
[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，

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