大气中CO_2浓度增加对我国农业生产的影响

EFFECTS OF CO_2 CONTENT INCREASING IN THE ATMOSPHERE ON AGRICULTURAL PRODUCTION IN CHINA

本文分析了大气中ＣＯ２浓度增加的事实、原因及其发展趋势．结果认为，大气中ＣＯ２浓度上升对我国农业的发展产生了一定的不利影响。因此，为控制大气中ＣＯ２的上升，必须采取相应的有效对策。

he content of CO2 in the atmosphere has been increasing rapidly since industry revolution when the concentration of CO2 was 275 (±10)×10-6. It rose up to 316×10-6 in 1958, and 315×10-6 in 1988. The effectS of CO2 content increasing in the air on agriCultural production in China are predicted as follows: 1) The primary productivity of crops would be going to rise beacause of strengthening Photosynthesis; 2) Crops would have a higher rate of water-use in the air with much more content of CO2 ; 3) Roots, stems, leaves, flowers, fruits and seeds might be enhancedly growing ; 4) Global climate change, caused partly by the increasing CO2, would lead to series of transformations of agriCultural productive conditions, such as light, temperature,water, soil and air etc.. And so, the output of crops would be influenced. Owing to greatly different natural environment in China, the change of agricultural conditions might be quite different in various areas. In Northeast China the production might increase ; in North China and in the middle and lower reaches of the Changjiang RiVer the fluctuation of crop yield might beenlarged and more agricultural disasters might occur; in Northwest China irrigated agriculture might be threatened, while in South China agriculture might be less influenced. And so, some countermeasures for agricaltural production in China are put foward: 1) to control the source of CO2; 2) to reform agricultural system, and regulate the structure of agricultural ecosystem, and, 3) to adjust the process of CO2 to influence agricultural production.