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试验设350μmolmol-1和700μmolmol-12种CO2浓度水平,湿润、干旱2种水分处理和施N0、50、100、150和200mgkg-15个水平。结果表明,CO2浓度增加,春小麦地上部碳固定量和碳固定总量均增加,但与氮肥施用水平有关。在中氮和高氮时,CO2浓度增高,地上部碳固定量和碳固定总量明显增加,而不施氮肥和低氮时,增加则不明显。不同水分处理地上部碳固定量和碳固定总量也没有明显差别,这表明,CO2浓度升高对氮素和水分胁迫及对春小麦碳固定并没有补偿作用。
The experiment set the CO2 concentration of 350μmolmol-1 and 700μmolmol-12, wet and drought two kinds of water treatment and application of N0, 50,100,150 and 200mgkg-15 levels. The results showed that with the increase of CO2 concentration, the aboveground carbon fixation amount and total carbon fixation increased, but it was related to the nitrogen application level. Under medium nitrogen and high nitrogen, the CO2 concentration increased, the aboveground carbon fixed amount and the total carbon fixed amount increased obviously, but not increased when the nitrogen fertilizer and the low nitrogen fertilizer were not applied. There was also no significant difference in the amount of carbon fixation and the total amount of carbon fixation in shoots under different water treatments, which indicated that the increase of CO2 concentration had no compensatory effect on nitrogen and water stress and on carbon fixation of spring wheat.