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

被引：17

作者：

伍玉鹏 ^{[1
,2
]}

刘田 ^{[1
]}

彭其安 ^{[1
]}

Muhammad Shaaban ^{[1
]}

胡荣桂 ^{[1
,2
]}

机构：

[1] 华中农业大学资源与环境学院

[2] 农业部长江中下游耕地保育重点实验室

来源：

农业环境科学学报 | 2014年 / 33卷 / 10期

关键词：

作物残渣还田; 温室气体排放; C/N; 氮肥配施; 红壤;

D O I：

暂无

中图分类号：

S154.1 [土壤生态学];

学科分类号：

071012 ; 0713 ;

摘要：

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1 271.44、1 212.83 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5 550.42μg·kg-1,显著高于无氮肥配施的4 430.44μg·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。

引用

页码：2053 / 2062

页数：10

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