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The the spring wheat Ningchun test material, the use of 2 factor completely randomized design, the use of open-top culture chamber simulated atmospheric CO 2 concentration of two air CO 2 concentration: 400 μmol mol-1 and 760μmol · mol-1; nitrogen levels: the pure N 0 g (N0), 0.1 (N1), 0.2 g / kg dry soil (N2). Experiment a total of six treatment combinations, each treatment was repeated 10 times. Reached the following main conclusions: (1) high atmospheric CO 2 concentration will reduce wheat leaf chlorophyll content, and plenty of N can weaken the high atmospheric CO 2 concentration the impact of chlorophyll Adding nitrogen can not only improve the chlorophyll content, and chloroplast chlorophyll a and chloroplast b proportional relationship to improve, enhance chloroplast light use efficiency. High nitrogen leaves the photosynthesis 2 concentrations did not occur in the high atmospheric CO adaptive down, and, under low N, 2 concentration treatment under high atmospheric CO Wheat the leaf photosynthesis adaptive cut. High atmospheric CO 2 the concentration under wheat leaf photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) with the applied N amount increased and increased in the high nitrogen level increase, respectively, 57.1%, 94.1% and 70.4%, respectively, while the intercellular CO 2 concentration (Ci) and water use efficiency (WUE) increased with the amount of nitrogen was first decreased and then increased the trend. The high of atmospheric CO 2 the wheat leaf Pn, Ci and WUE concentrations significantly higher than normal CO 2 concentration, an average increase of 36.8%, 74.0% and 102.7%. (2) atmospheric CO wheat jointing stage 2 concentration plant height an average increase of 1.6cm (N0), 1.9cm (N1), 2.0cm (N2), heading stage. 2.7cm (N0) -3.1cm (N1), 2.6cm (N2), the harvest period 4.0cm (N0), 4.8cm (N1)-0.6cm (N2). The high of atmospheric CO 2 wheat shoot dry matter concentration can increase nitrogen levels are higher than normal atmospheric CO 2 process, and the highest increase in the level of nitrogen in high nitrogen levels increase minimum. Spike length in the heading stage under low nitrogen (N0) and high nitrogen (N2) level performance for high atmospheric CO 2 concentrations higher than normal atmospheric CO 2 concentration , an increase of 10.0% and 8.5%, respectively; the harvest high atmospheric CO 2 Spike long concentration under normal atmospheric CO higher than the levels of nitrogen (N1) 2 concentrations, an increase of 13.3%. Under low nitrogen (N0) and nitrogen (N1) level the atmospheric CO 2 concentration wheat grain weight, respectively, an increase of 7.8% and 2.1%, grain weight per pot, respectively, an increase of 17.0% and 33.4 %, while grain weight and high nitrogen (N2) level each pot grain weight no significant impact.
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