欢迎访问《中国农学通报》，
中国农学通报

中国农学通报 ›› 2009, Vol. 25 ›› Issue (1): 211-216.

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

淮河流域农田CO2和热通量日、季节变化特征

伍琼,严平,田红,杨书运   

  • 收稿日期:2008-09-11 修回日期:2008-11-19 出版日期:2009-01-05 发布日期:2009-01-05

Seasonal and Diurnal Variations of CO2 flux and heat flux

  • Received:2008-09-11 Revised:2008-11-19 Online:2009-01-05 Published:2009-01-05

PDF (PC)

665

摘要： 利用淮河流域寿县国家气候观象台2007年7月至2008年6月全年每天48 个时次的湍流通量涡度观测资料，分析近地层CO2和热通量的日变化和季节变化，结果表明：CO2、净辐射和潜热通量具有明显的日变化和季节变化。日变化幅度随季节变化明显,表现在春、夏两季CO2、净辐射和潜热通量日变化幅度大, 冬、秋季变化幅度较小；分季节研究发现CO2通量在夏季和春季（水稻及小麦生长期）较大，而在下垫面无作物以及被积雪覆盖时只有-0.051 mg﹒m-2﹒h-1 ～-0.047 mg﹒m-2﹒h-1，整个观测期CO2通量日平均值约为-0.59mg﹒m-2﹒h-1，农田明显为CO2的汇；净辐射和潜热通量在5 月份最大, 1 月份最小。

关键词: 牛病毒性腹泻-粘膜病病毒, 牛病毒性腹泻-粘膜病病毒, 分离鉴定, RT-PCR

Abstract: Using the half hourly datas of turbulence flux which observed by the eddy covariance (EC) from July, 2007 to June, 2008 at Shouxian climate observatory in Huaihe River Basin. Analyze the Seasonal and Diurnal Variations of CO2 flux and heat flux in the surface layer. The results show that CO2 flux and heat flux have characteristics of significant Seasonal and Diurnal Variations. The variation of diurnal amplitude is variations with season , showing that the flux amplitude in summer and spring is larger and smaller in winter and autumn ；The average CO2 flux in summer and spring is larger and only about -0.051 mg﹒m-2﹒h-1 ～-0.047 mg﹒m-2﹒h-1 （the paddy and wheat growing period ）in the period when the cropland without crops or covered with snow .It is obviously that CO2 is always absorbed by the crops as the average CO2 fluxes during the experimental period is about -0.59mg﹒m-2﹒h-1。Net radiation and latent flux are maxima in May and minima in January.