研究论文
邹建文,黄耀,宗良纲,郑循华,王跃思.稻田CO2、CH4和N2O排放及其影响因素[J].环境科学学报,2003,23(6):758-764
稻田CO2、CH4和N2O排放及其影响因素
- A field study on CO2, CH4 and N2O emissions from rice paddy and impact factors
- 基金项目：中国科学院知识创新工程重大项目(KZCX1SW0113);中国科学院“百人计划”项目
- 作者
- 单位
- 邹建文
- 南京农业大学资源与环境科学学院,南京 210095
- 黄耀
- 1. 南京农业大学资源与环境科学学院,南京 210095; 2. 中国科学院大气物理研究所,北京 100029
- 宗良纲
- 南京农业大学资源与环境科学学院,南京 210095
- 郑循华
- 中国科学院大气物理研究所,北京 100029
- 王跃思
- 中国科学院大气物理研究所,北京 100029
- 摘要：采用静态箱(暗箱)气相色谱法对稻田CO2、CH4和N2O排放进行田间原位测量.植株参与的稻田CO2排放季节变化与温度的季节变化一致,气温(土温)是主要驱动因子;而土壤水分状况是稻田CH4、N2O排放和无植株参与的稻田CO2排放季节变化的主要驱动因子.稻田非淹水期N2O和CO2排放与土温、气温呈极显著指数正相关(p<0.001),两气体之间亦呈极显著线性正相关关系(p<0.001).水稻植株自养呼吸和土壤呼吸的温度系数(Q10)分别为2.17和1.68.稻田CO2排放与水层深度呈弱的负相关关系(p<0.05).无植株参与的稻田CO2、CH4和N2O季节平均排放速率分别为198.35±34.00mg(m2·h),0.63±0.29mg(m2·h)和169.57±75.30μg(m2·h),而在植株参与下3者季节平均排放速率分别为1133.51±51.16mg(m2·h),1.39±0.20mg(m2·h)和231.48±35.09μg(m2·h).碳收支模拟计算结果表明,稻田生态系统表现为对大气中碳的净吸收.
- Abstract：A field experiment was conducted to evaluate CO2, CH4 and N2O emissions from rice paddy with static-chamber and a modified gas chromatograph (Agilent 4890D). In this paper, gas samples were taken simultaneously from rice-involved and rice-uninvolved plots. The seasonal trend of CO2 emission from rice-involved plot was determined by air / soil temperature while soil water status was the main factor controlling the seasonal pattern of CO2 emission from rice-uninvolved plot. Correlation analysis demonstrated that CO2 emissions were significantly correlated with N2O fluxes during non-flooding period (p<0.001). The exponential relationships between CO2 emissions from rice-involved or rice-uninvolved plot and air or soil temperature were expressed through temperature coefficient (Q10), which was for 2.17 and 1.68, respectively (p<0.001). A positive correlation of N2O flux with soil /air temperature was also obvious during non-flooding period (p<0.001) and a negative correlation of CO2 emission with water level was perceivable for rice-involved or rice-uninvolved plots (p<0.05). The mean seasonal emission rates of CO2, CH4 and N2O for rice-uninvolved plot were 198.35±34.00mg/(m2·h), 0.63±0.29mg/(m2·h) and 169.57±75.30 μg/(m2·h), respectively. For rice-involved plot, the mean seasonal emission rates of CO2, CH4 and N2O reached 1133.51±51.16mg/(m2·h), 1.39±0.20mg/(m2·h),and 231.48±35.09μg/(m2·h),respectively. The calculation with Q10 and mathematic functions suggested that the amount of CO2 absorbed was more than the released for rice ecosystem over growing season.
- Key words：rice paddy CO2 CH4 N2O impact factor correlation analysis
摘要点击次数： 2846 全文下载次数： 5050
