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应用生态学报 ›› 2003, Vol. ›› Issue (3): 354-358.

• 研究论文 • 上一篇    下一篇

日光温室CO2浓度变化规律研究

魏珉, 邢禹贤, 王秀峰, 马红   

  1. 山东农业大学园艺学院, 泰安 271018
  • 收稿日期:2001-08-15 修回日期:2001-11-30 出版日期:2003-03-15
  • 通讯作者: 王秀峰
  • 基金资助:
    山东省教育厅基金(J99I04);山东省优秀中青年科学家科研奖励基金资助项目(鲁科计字(1997)第319号)

Variation of CO2 concentration in solar greenhouse in Northern China

WEI Min, XING Yuxian, WANG Xiufeng, MA Hong   

  1. College of Horticulture, Shandong Agricultural University, Taian 271018, China
  • Received:2001-08-15 Revised:2001-11-30 Online:2003-03-15

摘要: 研究了日光温室内CO2浓度的时空变化规律.结果表明,日光温室CO2浓度日变化曲线通常呈不规则“U”形,有时呈不规则“W”形.冬春栽培过程中日最高CO2浓度逐渐减小,日最低浓度和昼平均浓度先降后升,CO2亏缺时间逐渐延长.温室内CO2空间分布特点通常是早晨和傍晚为前部>中部>后部,近地面层>作物冠层>顶层;中午前后为前部<中部<后部,近地面层>顶层>作物冠层.影响日光温室CO2浓度变化的主要环境因素是光照度,通风不能阻止温室内高浓度CO2外逸和避免CO2亏缺.幼苗期群体光合较弱、土壤呼吸旺盛,温室CO2浓度较高;结果期群体光合旺盛、土壤呼吸衰竭,CO2亏缺严重.

Abstract: The variation of CO2 concentration in winter spring cultivated solar greenhouse in northern China was studied. The diurnal change of CO2 concentration showed an irregular 'U' shape in most case, the maximum value appeared prior to unveiling straw mat in the morning, and the minimum between12:00 and 14:00 PM. Sometimes, an irregular 'W' shape curve with two valleys was also observed, with the first one appeared prior to the ventilation at noon, and the second occurred between15:00~16:30 PM. During the period of winter spring cultivation, the daily maximum concentration of CO2 in solar greenhouse decreased gradually, while the daily minimum concentration and daytime average concentration dropped first, then went up. At the same time, the time of CO2 depletion lasted longer and longer. In December, CO2 depletion happened 2.1~3.1 hours after morning unveiling. In the next March, however, it moved up to 0.6~1.1 hours after unveiling in the morning. At daytime, both during and after ventilation, solar greenhouse often showed CO2 depletion. The period of CO2 depletion extended from 4~5.8 hours per day in December to 8~8.5 hours per day in March of next year. The spacial distribution of CO2 concentrations within the greenhouse showed that in the morning and in the evening, the order was the front>the middle>the back, and the ground>the canopy>the upper, and at midday, the order was the front <the middle<the back, and the ground>the upper>the canopy. Photon flux density was the most important environmental factor affecting CO2 concentration in greenhouse. Ventilation did not avoided CO2 depletion. Canopy photosynthetic rate and soil respiratory rate were measured at different growth stages of tomato. At seedling stage, CO2 concentration in greenhouse was higher than that outside, due to the vigorous soil respiration and lower canopy photosynthetic rate. But at fruiting stage, severe CO2 depletion occurred because of stronger canopy photosynthesis and weak soil respiration.

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