摘要
覆膜滴灌条件下,采用静态箱-气相色谱法研究了不同施肥策略:CK(不施肥)、CF(N 300 kg/hm^2;P2O590 kg/hm^2;K2O 60 kg/hm^2)、60%CF+OF(普通有机肥6 000 kg/hm^2)、60%CF+BF(生物有机肥6 000 kg/hm^2)对棉田土壤N_2O排放的影响,旨在明确滴灌棉田连续不同施肥策略下土壤N_2O的排放特征。结果表明,棉花生育期N_2O排放通量表现为施肥处理大于不施肥处理,滴灌施肥后第3/4天N_2O排放通量顺序为CF>60%CF+OF>60%CF+BF>CK,而滴灌后第7/8天N_2O排放通量则表现为有机肥处理高于化肥处理,滴灌施肥结束后表现与之相同;生育期的N_2O排放总量以100%化肥处理(CF)最高,与其相比,60%CF+OF和60%CF+BF处理分别降低3.75%和8.37%,N_2O排放系数则分别降低1.39%和73.8%;相关及通径分析均表明,与土壤NH+4-N相比,NO-3-N与N_2O排放的关系更密切。
The effects of combining organic fertilizer with chemical fertilizer on cotton field N2 O emission flux,emission characteristic and total amount of N2 O emission were investigated by using the static chamber-gas chromatograph method under plastic-mulched drip irrigation. The four-year field experiment consisted of four treatments,including CK,CF,60% CF + OF and 60% CF + BF( without fertilization as CK,total chemical fertilizer as CF,organic fertilizer as OF and bio-organic fertilizer as BF). The results showed that N2 O emissions with fertilizer supply were significantly higher than that without fertilizer treatment during the growing season of cotton. The order of N2 O emission on the third or fourth days after fertilization was: CF 60% CF + OF 60% CF + BF CK,and a significant difference existed between treatments( P〈0. 01) during each fertigation schedule with drip irrigation system. However,treatments with organic fertilizer combined with chemical fertilizer increased N2 O emission compared with chemical fertilizer treatments on the seven or eighth days after fertigation. In addition,when all irrigation and fertilization schedules were finished,higher N2 O emission flux was always observed with treatments supplied with organic fertilizer in contrast to that with chemical fertilizer application. The highest amount of total N2 O emission in the cotton growing season was found in CF treatment. Compared with CF,the treatments of 60% CF + OF and 60% CF + BF decreased N2 O emission by 3. 75% and 8. 37%,respectively. It was found that N2 O emission factor( EF) was also decreased by 1. 39% with 60% CF +OF treatment and by 73. 8% with 60% CF + BF treatment. Meanwhile,path analysis showed that N2 O emission was more closely related to soil NO3^--N content than to NH+4-N content.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2015年第12期204-211,共8页
Transactions of the Chinese Society for Agricultural Machinery
基金
农业部公益性行业科研专项资助项目(201103004)
"十二五"国家科技支撑计划资助项目(2012BAD42B02)
关键词
滴灌棉田
铵态氮
硝态氮
N2O排放通量
通径分析
Drip irrigated cotton field
Ammonium nitrogen
Nitrite nitrogen
N2O emission flux
Path analysis