三江平原春小麦农田生态系统氧化亚氮通量特征  

Characteristics of nitrous oxide flux in spring wheat field ecosystem in Sanjiang Plain of Northeast China.

作　　者：陈卫卫[1] 王毅勇[2] 赵志春[2] 顾江新[1] 

机构地区：[1]中国科学院大气物理研究所LAPC开放实验室,北京100029 [2]中国科学院东北地理与农业生态研究所,长春130012

出　　处：《应用生态学报》2007年第12期2777-2782,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金重点项目(40331014);中国科学院资源环境领域野外台站研究基金项目;中国科学院东北地理与农业生态研究所湿地生态与环境重点实验室基金资助项目(WELF-2004-B-004).

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,并主要与年际间降水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5 cm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0.190 mg.m-2.h-1,收割后到冰冻期间为0.077 mg.m-2.h-1,冻融期间为0.017 mg.m-2.h-1.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.

关 键 词：三江平原 小麦农田生态系统 N2O通量 环境因子 

分 类 号：S512.1[农业科学—作物学]