CAJ | 학술논문

氮肥配施能够促进还田秸秆的分解，为了解其对不同 C/N 秸秆还田下温室气体排放的影响，采用培养实验方法，研究了油菜饼（C/N 为4）、玉米秸秆（C/N 为28）、水稻秸秆（C/N 为41）和小麦秸秆（C/N 为71）等4种不同 C/N 植物残渣在不同量氮肥（无氮、低氮和高氮）配施下对红壤温室气体（CO2、CH4和 N2O）排放的影响。结果显示，氮肥配施增加了不同植物残渣的 CO2-C 累积排放量，且仅在高 C/N 的小麦秸秆处理中发现存在显著性差异，在低氮和高氮下 CO2-C 累积排放量分别达到1271.44、1212.83 mg· kg-1，显著高于无氮肥配施的883.40 mg·kg-1。土壤 N2O 累积排放量最大的为油菜饼处理组，低氮量的配施进一步增强了 N2O 的产生，其累积排放量达到5550.42μg·kg-1，显著高于无氮肥配施的4430.44μg·kg-1，然而当氮肥施用量进一步增加时却抑制了 N2O的排放（3752.84μg·kg-1）。氮肥配施并未显著影响玉米秸秆和小麦秸秆处理组的 N2O 累积排放量。在培养期内，每一个处理均表现为 CH4的吸收现象，氮肥施用能够增加土壤对 CH4的累积吸收量，但差异显著性仅在对照和油菜饼处理中发现。
담비배시능구촉진환전갈간적분해，위료해기대불동 C/N 갈간환전하온실기체배방적영향，채용배양실험방법，연구료유채병（C/N 위4）、옥미갈간（C/N 위28）、수도갈간（C/N 위41）화소맥갈간（C/N 위71）등4충불동 C/N 식물잔사재불동량담비（무담、저담화고담）배시하대홍양온실기체（CO2、CH4화 N2O）배방적영향。결과현시，담비배시증가료불동식물잔사적 CO2-C 루적배방량，차부재고 C/N 적소맥갈간처리중발현존재현저성차이，재저담화고담하 CO2-C 루적배방량분별체도1271.44、1212.83 mg· kg-1，현저고우무담비배시적883.40 mg·kg-1。토양 N2O 루적배방량최대적위유채병처리조，저담량적배시진일보증강료 N2O 적산생，기루적배방량체도5550.42μg·kg-1，현저고우무담비배시적4430.44μg·kg-1，연이당담비시용량진일보증가시각억제료 N2O적배방（3752.84μg·kg-1）。담비배시병미현저영향옥미갈간화소맥갈간처리조적 N2O 루적배방량。재배양기내，매일개처리균표현위 CH4적흡수현상，담비시용능구증가토양대 CH4적루적흡수량，단차이현저성부재대조화유채병처리중발현。
Nitrogen(N)fertilizer application can accelerate decomposition of incorporated residues in soils. However, the effect of N appli-cations on greenhouse gas(GHG)emissions following incorporation of different C/N residues is still not well understood. In this study, an in-cubation study was carried out to examine GHG emissions from red soil incorporated with rape cake(C/N:4), maize stalk(C/N:28), rice straw(C/N:41)and wheat straw(C/N:71)under three N addition rates(zero, low and high levels). Nitrogen applications increased CO2 e-mission, but significant difference was observed only in wheat straw treatment. The cumulative CO2 emission in wheat straw treatment was 1 271.44 mg·kg-1 at low N and 1 212.83 mg·kg-1 at high N application, significantly higher than that of no N application (883.40 mg· kg-1). The cumulative N2O emission was highest in rape cake treatment(5 550.42 μg·kg - 1)at low N application while relatively lower N2O emission(3 752.84 μg·kg-1)at high N addition. However, nitrogen application did not show significant influence on the cu-mulative N2O emissions in soils incorporated with maize and wheat residues. Over the entire incubation period, all treatments tended to be a sink of CH4. Overall, nitrogen effects on GHG emissions depend on residue C/N ratios.