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农田 CO_2浓度是决定作物光合生产力的重要因素之一。Wittwer(1973)认为,几乎所有的经济作物,在提高环境 CO_2浓度时,都能增加产量。他还认为,改善环境 CO_2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 CO_2。可见,观测并分析农田 CO_2浓度状况和了解农田 CO_2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 CO_2浓度的变化,早已为人们所认识,但是,由于观测技术的限制,对农田 CO_2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,CO_2浓度观测技术得到了初步
CO_2 concentration in farmland is one of the important factors that determine crop photosynthetic productivity. Wittwer (1973) argues that almost all cash crops increase yields when increasing environmental CO 2 concentrations. He also believes that improving the environmental CO 2 concentration on the benefits of increased yield than any other environmental factors have become more significant. Farmers in our country have always attached great importance to the ventilation of farmland, and one of the essential contents of ventilation is to provide the CO 2 needed for crop photosynthesis. Therefore, observing and analyzing the status of CO_2 in farmland and understanding the supply of CO_2 in farmland is one of the important topics for researching crop photosynthesis productivity. The changes of CO 2 concentration in farmland have long been known, however, due to the limitations of observational techniques, the understanding of CO 2 concentration in farmland has been slow to progress. In the 1950s, due to the development of infrared technology, CO 2 concentration observation technology was preliminary