北京市海淀公园绿地CO_2通量变化特征  

Seasonal Change of CO_2 Flux over Haidian park Green Space in Beijing

作　　者：王修信[1,2] 朱启疆[2] 陈声海[2] 刘馨[2] 杨胜天[2] 孙睿[2] 

机构地区：[1]广西师范大学计算机科学与信息工程学院,广西桂林541004 [2]北京师范大学遥感科学国家重点实验室,环境遥感与数字城市北京市重点实验室,北京100875

出　　处：《应用基础与工程科学学报》2011年第1期166-172,共7页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(4057110941061040);北京市自然科学基金重点基金项目(4051003);北京师范大学与北京市教委共建项目(JD100270540);广西师范大学博士科研启动基金项目(2007)

摘　　要：为了定量评估城市绿地吸收CO2改善城市生态环境的效果,2006年4月—2007年3月在北京海淀公园绿地使用涡度相关系统连续观测CO2通量、总辐射、大气温度,并使用冠层分析仪测量叶面积指数,研究CO2通量的变化及其影响因素.结果表明,绿地CO2通量受植被生物活动的影响呈现明显的季节变化特征,晴天天气状况下CO2通量日均值FCO2在4—10月为负值,绿地是CO2汇,在6—9月是CO2强吸收汇,FCO2约-0.100—-0.120mg/m2.s,而在11—3月FCO2为正值,绿地为CO2源,12—2月是CO2强排放源,FCO2约0.100mg/m2.s.绿地CO2通量受总辐射、LAI、大气温度的显著影响,净辐射的影响明显大于大气温度,净辐射越大、LAI越大、大气温度越高,绿地光合作用吸收CO2的能力越强.观测期间一年海淀公园绿地CO2的净吸收量约为615gCO2/m2.To estimate how much CO2 an urban green space absorbs in improving urban microclimate environment,CO2 flux,radiation and atmospheric temperature were measured continuously by the eddy covariance technique from April 2006 to March 2007 over Haidian park green space in Beijing.Also leaf area index（LAI）was measured with a plant canopy analyzer there.Based on the measurements,CO2 flux shows remarkable seasonal change as it is affected by surface vegetation leaf area and physiological activity.Since average daily CO2 flux is negative,the green space is CO2 sink on clear days from April to October.The green space becomes strong CO2 sink from June to September while average daily CO2 flux ranges from-0.100 to-0.120mg/m2·s.However,the green space changes to CO2 source from November to March as average daily CO2 flux is positive,and it appears strong CO2 source from December to February as average daily CO2 flux is estimated to be 0.100mg/m2·s.Moreover,CO2 flux is highly correlated with radiation,LAI and atmospheric temperature.Radiation affects CO2 flux more significantly than atmospheric temperature does.The greater net radiation,the greater LAI,or the higher atmospheric temperature becomes,the more CO2 the green space absorbs with vegetation photosynthetic activity.The annual net CO2 assimilation is estimated to be 615gCO2/m2 during the observation period.

关 键 词：城市公园绿地 涡度相关法 CO2通量 季节变化特征 

分 类 号：Q948[生物学—植物学]