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为了解高寒冷凉地区日光温室内CO2浓度变化特征,预报温室内CO2浓度,调控温室内CO2浓度提供依据,根据2012年4月—2013年3月大通县国家现代农业示范园区节能日光温室内CO2浓度、温室内外气象要素观测资料,及大通县气象观测数据,分析高寒冷凉地区不同天气类型下日光温室CO2浓度变化规律。结果表明,试验期间CO2浓度在184~577 mg/kg之间,日平均值为383 mg/kg,日平均和最小值均呈极显著上升态势;不论何种天气类型,日光温室CO2浓度日变化均呈“U”型曲线,作物生长的旺盛期,自然通风无法避免CO2亏缺;CO2浓度最小值多云天与日地表温度最大值之间的相关性最好,晴天和阴天与日平均温度间的相关性最佳;除2013年3月外,各月均出现CO2亏缺现象,CO2亏缺时长与日CO2浓度最小值间存在二次曲线关系。
In order to understand the variation characteristics of CO2 concentration in sunlight greenhouse in the cold and cold region, forecast the CO2 concentration in the greenhouse and provide the basis for the regulation of CO2 concentration in the greenhouse, according to the data of CO2 in the greenhouse of Datong County Modern Agriculture Demonstration Park from April 2012 to March 2013 Concentration, the observational data of meteorological elements both inside and outside the greenhouse and the meteorological observation data of Datong County, and analyzed the variation law of CO2 concentration under different types of climate in the cold and cold areas in the cold region. The results showed that during the experiment, the CO2 concentration was between 184-577 mg / kg and the average daily value was 383 mg / kg. The daily average and the minimum showed a very significant increase trend. No matter what kind of weather, the diurnal variation of CO2 concentration in sunlight greenhouse All the curves showed “U” curve. The vigorous period of crop growth and natural ventilation could not avoid the CO2 deficit. The correlation between the minimum CO2 concentration and the maximum surface temperature was the best, The correlation between average temperature was the best. Except for March 2013, there was a CO2 deficit in each month. There was a quadratic curve between the CO2 deficit duration and the minimum daily CO2 concentration.