摘要
为明确典型设施蔬菜地N2O排放规律及其影响因素,采用静态箱法,对北京郊区典型设施菜地番茄生长季进行了系统的观测,并分析了氮肥施用量、土壤温度、土壤水分对土壤N2O排放的影响。结果表明:设施番茄地N2O排放具有明显的生长季变异性,随着施肥和灌溉事件呈现多峰的动态变化规律。与农民习惯施肥处理(FP)相比,减氮施肥处理(OPT)能减少N2O排放总量41.67%,减氮施肥+硝化抑制剂处理(OPT+DCD)则能减少N2O排放总量54.46%;各处理N2O的排放系数介于0.55%～1.15%之间;土壤N2O排放与土壤湿度表现出显著的相关性,但与土壤温度未表现出明显相关性。
To identify nitrous oxide （N2O） emissions under greenhouse vegetable systems, a field experiment with 4 treat- ments was performed in a typical vegetable field in Beijing suburbs using static chamber techniques. The impacts of nitrogen fertilizer application, soil temperature and moisture on N2O fluxes were also analyzed. The results showed that N2O fluxes from vegetable tomato fields showed visible dynamic variations due to the high fertilizer nitrogen （N） and irrigation water inputs. Compared to the farmers＇ traditional practice, the decrease of fertilization management significantly reduced the cumu- lative N2O emissions by 42%, while the combination of the decrease fertilization and nitrification inhibitor treatment could reduce cumulative N2O emissions by 54%. The observed emission factors of the applied N for different treatments ranged from 0. 55% to 1.15%. There was a significant positive correlation between N2O emissions and soil moisture for each treat- ment, whereas no significant correlation was found between N2O emissions and soil temperature.
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2012年第5期5-10,共6页
Soil and Fertilizer Sciences in China
基金
公益性行业(农业)科研专项(201103039)
中央级公益性科研院所基本科研业务费(202-35)
关键词
设施蔬菜地
N2O排放
排放系数
影响因素
greenhouse vegetable fields
N2O emissions
emission factors
influencing factors
