| 摘要: |
| 农田 CO2浓度是决定作物光合生产力的重要因素之一。Wittwer(1973)[10]认为,几乎所有的经济作物,在提高环境 CO2浓度时,都能增加产量。他还认为,改善环境 CO2浓度对增产的效益比改善其它任何环境因素都表现得更为显著。我国农民历来重视农田通风,而通风的实质性内容之一,就是为了提供作物光合作用所需的 CO2。可见,观测并分析农田 CO2浓度状况和了解农田 CO2供应问题,是研究提高作物光合生产力的重要课题之一。农田 CO2浓度的变化,早已为人们所认识[17],但是,由于观测技术的限制,对农田 CO2浓度变化的了解一直进展缓慢。50年代,由于红外技术的发展,CO2浓度观测技术得到了初步 |
| 关键词: 农田 观测技术 通风 作物群体 北京地区 光合生产力 浓度变化 高产麦田 浓度梯度 群体光合作用 |
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| ANALYSIS OF CO_2 COMCENTRATION UNDER HIGH YIELD WHEAT FIEIDS IN BEIJING DISTRICT |
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| Abstract: |
| This paper discribes the variation of the CO_2 concentration and CO_2 profiles during daytime.The phenomena were observed in high yield wheat field of Beijing district. It shows that the CO_2 concentration is very low in an actively photosynthesising wheat field.It is lower than 250 ppm at the level of two thirds of the plant height.During a calm sunny day,it even decreases to 150 ppm or so i.e.it is only about fifty percent of aver- age of CO_2 concentration in the atmosphere. It also shows that there is a... |
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