油菜地CO_2、N_2O排放及其影响因素  

CO_2 and N_2O Emission From the Rape Field and Their Controlling Factors.

作　　者：张小洪[1] 袁红梅[2] 蒋文举[1] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]四川农业大学资源环境学院,四川雅安625014

出　　处：《生态与农村环境学报》2007年第3期5-8,共4页Journal of Ecology and Rural Environment

基　　金：国家自然科学基金(50410719)

摘　　要：2005年11月至2006年5月采用静态箱法对成都平原典型水稻-油菜轮作区油菜地CO2、N2O排放通量进行原位测定。结果表明,CO2排放通量为121.4～1 585.8 mg.m-2.h-1,平均656.8 mg.m-2.h-1;N2O排放通量为18.0～521.0μg.m-2.h-1,平均168.0μg.m-2.h-1。在整个油菜生长期内,地下5 cm土壤温度与CO2、N2O排放通量之间呈指数函数关系。3种不同处理油菜地CO2、N2O排放通量均为常规处理>无氮处理>裸地处理。土壤温度、施氮和植物生长是影响油菜地CO2、N2O排放的主要因素。CO2 and N2O emissions were monitored in-situ in rape field in Chengdu plain from November 2005 to May 2006 and their controlling factors were discussed. Results show that the mean CO2 emission flux in the rape field was 656.8 mg·m^-2·h^-1 ,ranging from 121.4 to 1 585.8 mg·m^-2·h^-1 ,the mean N2O emission flux,168.0 μg·m^-2·h^-1 ,ranging from 18.0 to 521.0 μg·m^-2·h^-1. CO2 and N2O emission flux was highly correlated with soil temperature at 5 cm depth. Moreover,CO2 and N2O emission flux in the rape field was affected by soil organic carbon content,fertilization, soil temperature, plant growth and other various factors.

关 键 词：油菜地 成都平原 CO2通量 N2O通量 影响因素 

分 类 号：X511[环境科学与工程—环境工程]