摘要
采用静态箱-气相色谱法,研究了控释肥料对四川丘陵地区覆膜节水高产栽培稻田N2O排放的影响.结果表明:稻田施用尿素及控释肥料后水稻生长期N2O排放总量分别为(38.2±4.4)和(21.5±5.2)mg N·m-2;施用尿素处理N2O排放系数为0.25%,施用控释肥料处理N2O排放系数为0.14%,减少了43.6%(P<0.05),其中烤田前减少了49.6%(P<0.05);控释肥料可抑制施肥引起的N2O排放峰值,降幅达52.6%;控释肥料对水稻不同生长季节土壤微生物生物量氮、NH4+-N含量和水稻产量均无显著影响;N2O排放与5 cm土壤温度、土壤Eh值无显著相关性.
A field experiment was conducted to assess the effect of controlled release fertilizer on N2O emission in paddy field under plastic film mulching cultivation （PM） with water-saving irriga- tion. Results showed that in the rice growing season, cumulative N2O emissions from the plots applied with urea （PM＋U） and with controlled release fertilizer （PM＋CRF） were （38.2±4.4） and （21.5±5.2） mg N . m^-2, respectively. The N2O emission factors were 0.25% and 0.14% in the treatments PM＋U and PM＋CRF, respectively. The controlled release fertilizer decreased the total N2O emission by 43.6% compared with urea, of which 49.6% was reduced before the drying period. It also reduced the peak of N2O emission by 52.6%. However, it did not affect soil microbial biomass N and soil NH4 ^＋-N content at any rice growing stage, and grain yield either. No significant correlation was observed between N2O flux and soil Eh or soil temperature at the depth of 5 era.
出处
《应用生态学报》
CAS
CSCD
北大核心
2014年第3期769-775,共7页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(41271259)
科技部国际科技合作项目(2012DFG90290)
公益性行业(农业)科研专项(201103039)
中国香港特别行政区嘉道理农场暨植物园项目资助
关键词
地膜覆盖
N2O排放
稻田
控释肥
微生物生物量氮
plastic film mulching
N2O emission
paddy field
controlled release fertilizer
microbial biomass N.
作者简介
张怡，女，1988年生，硕士研究生．主要从事农田温室气体排放及其减缓对策研究．E—mail：yzhang@issas．ac.cn
通讯作者．E-mail：hxu@issas．ac．cn
