欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
利用静态暗箱-气相色谱法对三江平原春小麦农田生态系统N2O排放通量进行连续2．5年的田间原位观测．结果表明：三江平原春小麦农田生态系统N2O排放通量具有较明显的季节变化和年际变化，并主要与年际间降术及田间水分管理差异有关；春小麦农田生态系统N2O排放日变化与气温及地下5cm温度变化有关．生长期N2O的排放较强，休耕期N2O排放量显著下降，冰冻期N2O的排放较微弱，融冻时N2O排放缓慢增强．生长期N2O平均排放通量为0．190mg·m^-2·h^-1，收割后到冰冻期间为0．077mg·m^-2·h^-1，冻融期间为0．017mg·m^-2·h^-1．
英文摘要：
With static-closed-chamber and GC （ Agilent 4890 ）, the nitrous oxide （ N2O） flux in spring wheat field ecosystem in the Sanjiang Plain of Northeast China was continuously observed in situ from May 2004 to October 2006. The results showed that the N2O flux presented obvious seasonal and inter-annual variation, which was mainly related with precipitation and field water management. The diurnal variation of N2O flux had correlations with the air temperature and the temperature at 5 cm underground. Wheat field ecosystem was the strong sources of atmosphere N2O during plant growth season. The N2O flux decreased obviously in fallowing period, was weaker in freezing period, and increased slowly when soil thawing. The average N2O flux in wheat growth season was 0. 190 mg·m^-2·h^-1, the flux was 0. 077 mg·m^-2·h^-1 from after-reaping to before- freezing period, and 0. 017 mg·m^-2·h^-1in freezing and thawing period.
同期刊论文项目
同项目期刊论文
期刊信息
位置：