| 伍玉鹏,刘田,彭其安,Muhammad Shaaban,胡荣桂.氮肥配施下不同C/N作物残渣还田对红壤温室气体排放的影响[J].农业环境科学学报,2014,33(10):2053-2062. |
| 氮肥配施下不同C/N作物残渣还田对红壤温室气体排放的影响 |
| Greenhouse Gas Emissions in Red Soil as Influenced by Different C/N Residues Under Nitrogen Applications |
| 投稿时间：2014-04-19 |
| DOI：10.11654/jaes.2014.10.025 |
| 中文关键词: 作物残渣还田 温室气体排放 C/N 氮肥配施 红壤 |
| 英文关键词: residue returning greenhouse gas emission C/N nitrogen fertilizer application red soil |
| 基金项目:国家自然科学基金（41171212；41401267）；中央高校基本科研业务费专项资金（2662013BQ015） |
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| 中文摘要: |
| 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着性差异，在低氮和高氮下CO2-C累积排放量分别达到1 271.44、1 212.83 mg·kg-1，显着高于无氮肥配施的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5 550.42 μg·kg-1，显着高于无氮肥配施的4 430.44 μg·kg-1，然而当氮肥施用量进一步增加时却抑制了N2O的排放（3 752.84 μg·kg-1）.氮肥配施并未显着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，但差异显着性仅在对照和油菜饼处理中发现。 |
| 英文摘要: |
| Nitrogen(N) fertilizer application can accelerate decomposition of incorporated residues in soils. However, the effect of N applications on greenhouse gas(GHG) emissions following incorporation of different C/N residues is still not well understood. In this study, an incubation 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 emission, 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 cumulative 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. |
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