摘要
采用原状土柱试验研究了施用硝化抑制剂双氰胺(DCD)对菜地(小白菜和辣椒)土壤N2O排放的影响.结果表明,施用DCD能显著降低菜地土壤N2O排放通量和排放总量,小白菜未施用DCD时施氮处理土壤N2 O排放总量为0.22 kg.hm-2,施用DCD后则显著减少至0.11 kg.hm-2,相当于减少了49.33%的土壤N2O排放.辣椒未施用DCD时施氮处理土壤N2O排放总量为2.32 kg.hm-2,施用DCD后则显著减少至1.14 kg.hm-2,相当于减少了50.9%的土壤N2O排放.未施氮处理时,施用与未施用DCD处理的土壤N2O排放通量均较低[<9μg.(m2.h)-1(小白菜)、22μg.(m2.h)-1(辣椒)],但施用DCD依然减少了土壤N2O的排放[33.5%(小白菜)、33.4%(辣椒)].同时,DCD降低了土壤N2O排放系数,小白菜未施用DCD时土壤N2O排放系数(EF)为0.15%,施DCD时则减少到0.07%;辣椒未施用DCD时土壤N2O排放系数为0.99%,施入DCD则减少到0.52%.由此说明,DCD是减少菜地土壤N2O排放的一项有效措施.
Undisturbed soil monolith lysimeter was used to investigate the effectiveness of DCD（dicyandiamide） in reducing N2 O emissions in vegetable（Chinese cabbage and pepper） field.Results showed that DCD significantly reduced total N2 O emission in vegetable field.Total N2 O emissions from the urea treatment without DCD reached 0.215 kg·hm-2 for Chinese cabbage,and it reduced to 0.109 kg·hm-2,equivalent to a 49.3% reduction.The total N2 O emissions for pepper were much higher compared with those for Chinese cabbage.The total N2 O emitted from the urea treatment was 2.32 kg·hm-2（without DCD） and it was reduced to 1.14 kg·hm-2 with DCD application,representing a 50.9% reduction.In the control treatments where no urea was applied,the daily N2 O flux was very low and it never exceeded 9 μg·（m2·h）-1 for Chinese cabbage and 22 μg·（m2·h）-1 for pepper,respectively,but DCD also reduced N2 O emissions（33.5% for Chinese cabbage and 33.4% for pepper）.In addition,the urea-N emission factor（EF） was 0.15%,0.99% for Chinese cabbage and pepper without DCD,respectively,and it was reduced to 0.07%,0.52% when DCD was applied.These results demonstrated the potential of using nitrification inhibitors（DCD） to mitigate N2 O emissions in vegetable system.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2011年第11期3188-3192,共5页
Environmental Science
基金
农业部"引进国际先进农业科学技术项目"(948项目)(2003-Z54
2008-Z25)
"十一五"国家科技支撑计划项目(2008BADA7B03)
关键词
温室气体
氧化亚氮
排放系数
硝化抑制剂
双氰胺
greenhouse gas
nitrous oxide
emission factor
nitrification inhibitors
dicyandiamide
