长江流域资源与环境 >> 2013, Vol. 22 >> Issue (8): 1214-.

• 生态环境 • 上一篇    下一篇

江汉平原稻田冠层CO2通量变化特征及其影响因素分析

苏荣瑞 |刘凯文 |耿一风 |田 皓 |周守华 |刘可群   

  1. (1.湖北省荆州农业气象试验站|湖北 荆州 434025;2.武汉区域气候中心|湖北 武汉 430074)
  • 出版日期:2013-09-20

CHARACTERISTICS OF CANOPY CO2 FLUX OVER PADDY ECOSYSTEM IN JIANGHAN PLAIN AND ITS INFLUENCE FACTORS ANALYSIS

SU Rongrui1, LIU Kaiwen1, GENG Yifeng1, TIAN Hao1, ZHOU Shouhua1, LIU Kequn2   

  1. (1. Jingzhou Agriculture Meteorological Trial Station of Hubei Province, Jingzhou Meteorological Bureau, Jingzhou 434025, China; 2. Wuhan Regional Climate Center, Wuhan 430074, China
  • Online:2013-09-20

摘要:

二氧化碳(CO2)、甲烷(CH4)、氧化亚氮(N2O)被认为是最重要的温室气体,在气候变化中扮演着重要角色,实地测定稻田生态系统CO2通量是农业源温室气体监测与控制技术研究的基本内容。采用涡度相关法对江汉平原稻田生态系统进行了通量观测,并对水稻不同生长阶段冠层CO2通量、潜热、显热通量变化特征及其影响因素进行了分析。结果表明:水稻各生育期冠层CO2、潜热、显热通量日变化均表现出明显的单峰特征,但幅度不同,这与太阳总辐射的日变化及下垫面作物叶面积指数大小关系密切。稻田系统作物呼吸与土壤呼吸排放CO2,排放通量一方面与温度的变化有关,另一方面也受灌溉、作物生长状况的影响;稻田光合作用吸收同化大气CO2,吸收通量与作物群体叶面积指数大小、光合有效辐射强度有关。不同生长期冠层CO2通量与温度因子(气温、5cm土层温度)、光辐射强度因子(时光合有效辐射曝辐量)的相关性均达到极显著水平(P<0.01),其中,分蘖-灌浆乳熟期CO2净通量对时光合有效辐射曝辐量响应的灵敏度较大,可以通过直角双曲线模型来拟合评估CO2净通量

Abstract:

Carbon dioxide (CO2), ethane (CH4) and nitrous oxide (N2O) are generally thought as the main greenhouse gases, playing an important role in climate change. It is considered that the observation of CO2 flux over paddy ecosystem is the main content of the research on agricultural sources of greenhouse gas monitoring and control technology. Based on eddy covariance system, the canopy flux of CO2, latent heat and sensible heat over paddy ecosystem at agrometeorological experimental station of Jingzhou were measured during May 2010 and September 2010 to analyze the variations and its influence factors. The results indicated that diurnal variations of carbon dioxide flux, latent heat and sensible heat showed a unipeak model, and the maximum values appeared around at 14〖DK〗∶00 in general, but the amplitude was different during rice transplanting, tillering, jointingheading, milky stage. This had a significant correlation with the diurnal variation of total solar radiation and the leaf area index (LAI) during each growth stage. The one hand, CO2 emission flux of soil and crop respiration has a correlation with temperature. On the other hand, it is related to irrigation and crop conditions. Plants absorb and assimilate CO2 by photosynthesis during the day, so CO2 absorption flux has a significant correlation with LAI and photosynthetically active radiation (PAR). Correlation coefficients between canopy CO2 flux and meteorological factors (air temperature, soil temperature in 5 cm, PAR exposure per hour, latent heat flux, sensible heat flux) were significant at 0.01 level (P<0.01) during rice stages. The correlation coefficients between canopy CO2 flux and PAR exposure per hour were much bigger during rice tillering, jointingheading, milky stage than other periods, which could be used to estimate canopy CO2 flux by MichaelisMenten model

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