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2001～2003年,在大田条件下以武香粳14号为供试品种,设计高、中、低氮处理,研究开放式空气CO2浓度增加(FACE)200μmolmol-1对水稻产量形成的影响及其原因。结果表明,FACE处理使水稻产量平均比对照增加12.8%,其中2001、2002和2003年增幅分别为10.8、14.1和13.6%,高、中、低氮处理的增幅分别为17.6、12.4、10.9%,均达到显著或极显著水平;FACE和氮处理对水稻产量的互作效应,2001、2002年达到显著水平,产量最高的处理组合为FACE×NN;FACE处理使水稻穗数平均比对照增加18.8%,每穗颖花数平均比对照减少7.6%,均达极显著水平;FACE处理使水稻生物产量平均提高16.2%,达极显著水平,使经济系数下降但未达到显著水平。进一步研究表明,FACE处理使水稻穗数极显著多于对照是因其分蘖发生速度快,最高分蘖数多所致,而不是其分蘖成穗率高的缘故;FACE处理使水稻每穗颖花数极显著少于对照是因其分化颖花的大量退化所致,而不是分化颖花数少的缘故。
Under high field conditions, Wu Xiangjing 14 was used as the test variety to design high, medium and low nitrogen treatments, and the effect of open air CO2 concentration increase (FACE) 200μmolmol-1 on the yield of rice was studied the reason. The results showed that the FACE treatment increased the rice yield by 12.8% on average compared with the control, of which the increase rates in 2001, 2002 and 2003 were 10.8, 14.1 and 13.6%, respectively, and those in high, middle and low nitrogen treatments were 17.6, 12.4 and 10.9% Reached the significant or extremely significant level. The interaction effect of FACE and nitrogen treatment on rice yield reached significant level in 2001 and 2002, and the treatment with the highest yield was FACE × NN. FACE treatment increased the average number of panicle rice by 18.8% , The average number of spikelets per panicle decreased by 7.6% compared with the control, reaching extremely significant level; FACE treatment increased the average biological yield of rice by 16.2%, reaching the extremely significant level, the economic coefficient decreased but did not reach the significant level. Further studies showed that FACE treatment significantly increased the number of panicles in rice compared with the control because of the rapid tillering and the highest number of tillers, not the high tillering rate. FACE treatment increased the number of spikelets per panicle Significantly less than the control was due to a large number of degeneration of spikelets, rather than a small number of differentiated spikes.