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作 者:史桂芬 成林[1,3] 张志红[1,3] Shi Guifen;Cheng Lin;Zhang Zhihong(CMA·Henan Key Laboratory of Agrometeorological Support and Applied Technique,Zhengzhou 450003,China;Henan Climate Center,Zhengzhou 450003,China;Henan Institute of Meteorological Science,Zhengzhou 450003,China)
机构地区:[1]中国气象局·河南省农业气象保障与应用技术重点开放实验室,郑州450003 [2]河南省气候中心,郑州450003 [3]河南省气象科学研究所,郑州450003
出 处:《气象与环境科学》2020年第4期65-71,共7页Meteorological and Environmental Sciences
基 金:国家自然科学青年基金(31601213);中国气象局·河南省农业气象保障与应用技术重点实验室开放基金(AMF202005、AMF201705);河南省气象局气象科学技术研究项目(KM201714)。
摘 要:探索冬小麦灌浆期CO2通量特征及其影响因素可为揭示冬小麦后期生长规律和开展田间管理提供科学依据。利用3年涡度相关系统观测的冬小麦开花至成熟期CO2通量数据,结合农田作物观测资料,分析了麦田灌浆期CO2通量变化特征及影响因素。结果表明:开花后麦田CO2通量日均值随灌浆进程非线性递减,开花至乳熟CO2通量日均值为-0.8^-0.4 mg·m^-2·s^-1,乳熟后降至-0.2~0.1 mg·m^-2·s^-1。CO2通量日峰值开花后10天内为-1.2^-0.9 mg·m^-2·s^-1,开花10天后为-0.9^-0.3 mg·m^-2·s^-1,乳熟后为-0.3~0.05 mg·m^-2·s^-1。群体同化CO2的能力与LAI成正比;长势与灌浆进程都相同的麦田,CO2通量主要受气象因子影响。晴天CO2通量日均值与气温、饱和水汽压差(VPD)呈显著正相关,但与风速、日照时数相关性不显著;逐小时CO2通量与气温、风速、VPD正相关。阴天的相关性整体比晴天的弱。Investigating the characteristics of CO2 flux and its influence factors during the filling period of winter wheat can provide a scientific basis for revealing the growth rules of winter wheat in the later period and carrying out field management.Using CO2 flux data of winter wheat from flowering to mature stages observed by the eddy covariance observation system for 3 years,this paper analyzes the variation characteristics of CO2 flux and influence factors during the wheat field filling period in combination with the observation data of field crops.The results show that,after flowering,the daily mean CO2 flux in wheat field decreases nonlinearly with the grouting process and the daily average CO2 flux ranges between-0.8 and-0.4 mg·m^-2·s^-1 from flowering to milk ripening;after milk ripe,the CO2 flux declines to-0.2 to 0.1 mg·m^-2·s^-1.In addition,the daily peaks of CO2 flux are-1.2 to-0.9 mg·m^-2·s^-1 within 10 days after flowering,-0.9 to-0.3 mg·m^-2·s^-1after 10 days of flowering,and-0.3 to 0.05 mg·m^-2·s^-1 after milky ripe,respectively.The ability of group assimilation of CO2 is proportional to LAI.For the wheat fields with the same growth and grouting processes,CO2 flux is mainly affected by meteorological factors.The daily means of CO2 flux in sunny days are positively correlated to air temperature and saturated vapor pressure difference(VPD),but have no significant correlation with wind speed and sunshine hours.Hourly CO2 flux is positively correlated to air temperature,wind speed,VPD and sunshine hours.The overall correlation is weaker in overcast days than in sunny days.
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