淮河流域典型农田生态系统碳通量变化特征  

Variation of Net Ecosystem Carbon Flux over Typical Agro-ecosystem in Huaihe River Basin

作　　者：李琪[1] 胡正华[1] 薛红喜[2] 王云龙[1] 谭甜甜 吴东丽[2] 

机构地区：[1]南京信息工程大学,江苏南京210044 [2]中国气象局气象探测中心,北京100081 [3]柯坪县气象局,新疆柯坪843600

出　　处：《农业环境科学学报》2009年第12期2545-2550,共6页Journal of Agro-Environment Science

基　　金：国家"十一五"科技支撑计划重点项目(2006BAD04B09);国家自然科学基金项目(40605029);南京信息工程大学科研启动项目(20080264)

摘　　要：为了准确评价农田生态系统在全球碳平衡中的作用,利用涡度相关技术对安徽省寿县冬小麦/水稻生态系统进行了碳通量的监测,并在数据校正、剔除和插补的基础上,研究生长季农田净生态系统碳交换(NEE)的变化特征。结果显示,2008年寿县农田生态系统CO2通量的日变化进程为单峰型,冬小麦和水稻最大的CO2吸收速率分别为2.45和2.48mg.m-2.s-1。从物候期的角度来看,冬小麦在抽穗期碳通量值最小,乳熟期最大;水稻拔节时期碳通量值最小,即固碳能力最强。冬小麦/水稻生态系统不同月份碳通量月均日变化也呈U型曲线,作物生命活动越旺盛,NEE峰值越高,夜间CO2排放则在8月份达到最高值。2008年冬小麦和水稻月平均最大日CO2吸收峰分别出现在4月和8月,分别为1.30和1.07mg.m-.2s-1。冬小麦生态系统NEE的日最大累积吸收量出现在4月16日,可达11.76gC.m-2.d-1,水稻生态系统的出现在8月3日,为10.40gC.m-2.d-1。冬小麦从拔节到成熟时间段内的固碳能力为326.87gC.m-2,水稻从返青到成熟时间段内的固碳能力也达到了300.05gC.m-2。For the accurate assessment on the function of agro-ecosystem in global carbon balance, carbon fluxes in winter wheat/rice ecosystem in Shouxian of Anhui Province were measured using eddy covariance technique. Based on the data rectification, rejecting and filling, the variation characteristics of net ecosystem CO2 exchange（ NEE ）in growing season was discussed. The results indicated that CO2 flux pattern in agro-ecosystem was single peak type in 2008. The maximum CO2 uptake rates for winter wheat and rice were 2.45 and 2.48 mg·m^-2·s^-1, respectively. The minimum and maximum values of CO2 flux for winter wheat were observed in the tassel period and at the milk stage, respectively. For the rice, the minimum value of CO2 flux occurred at the jointing stage. The average date change in one month of net ecosystem carbon flux showed the U type curve for the winter wheat/rice ecosystem in different month. The life activities were more vigorous, the peak values for the NEE were higher, and the carbon emission reached the maximum value in the August. The average date change values in one month of net ecosystem carbon flux for winter wheat and rice were 1.30 and 1.07 mg·m^-2·s^-1, occurred in April and August, respectively. Daily integrated NEE value of winter wheat ecosystem reached its uptake peak magnitude of I 1.76 gC·m·^-2·d^-1 on April 16, 2008, and for the rice ecosystem, the maximum daily integrated NEE value was 10.40 gC·m^-2·d^-1 on August 3, 2008. From the jointing stage to the mature stage in 2008, the value of carbon uptake was 326.87 gC·m^-2 for the winter wheat, and the value was 300.05 gC·m^-2 for the rice from green stage to mature stage.

关 键 词：农田生态系统 碳通量 淮河流域 涡度相关 

分 类 号：X511[环境科学与工程—环境工程]