大气CO2浓度升高和增温交互作用对水稻光合作用的影响
时间:2018-07-10 11:04 来源:毕业论文 作者:毕业论文 点击:次
| 摘要：为研究CO2浓度升高和增温交互作用对水稻光合作用的影响，以水稻（Oryza sativa L.）品种南粳9108为试验材料，利用开放式CO2浓度升高和温度增高平台（Free Air CO2 Enrichment And Increased Temperature，T-FACE）开展模拟CO2浓度和温度升高的气候环境的水稻栽培试验，研究水稻叶片在CO2浓度和温度升高条件下气孔导度、净光合速率、蒸腾速率以及水分利用效率的变化。结果表明，与对照CK上、中、下叶位相比，CO2浓度升高使气孔导度上位叶、下位叶提高4.13%和13.89%，但下位叶下降5.74%，差异均不显著；净光合速率上、中、下叶位分别降低2.26%、2.23%和11.34%，差异不显著；蒸腾速率上、中、下叶位分别降低为6.37%、3.46%和11.46%；水分利用效率均上升，上升比例分别为4.33%、1.73%和0.07%，差异不显著。温度升高使气孔导度上、中、下位叶分别增大74.45%、73.14%和48.61%，差异显著；净光合速率上位叶降低7.65%，中位叶增加4.50%，下位叶减小0.20%，差异不显著；蒸腾速率上、中、下叶位分别降低8.02%、5.00%和3.75%，对上位叶差异显著，对中位叶和下位叶差异不显著；水分利用效率分别上升0.30%、9.19%和2.67%，差异不显著。CO2浓度升高和增温交互作用会使叶气孔导度上位叶和中位增大61.59%和21.81%，下位叶减小36.82%，对上位叶差异显著，对中位叶、下位叶差异不显著；净光合速率上、中、下位叶分别减小15.96%、10.75%和63.45%，差异不显著；蒸腾速率上、中、下叶位分别下降22.09%、25.91%、65.69%，差异不显著；水分利用效率上、中、下叶位分别上升7.81%、33.72%和5.53%，差异不显著。本研究为进一步建立大气CO2浓度升高和增温交互作用对水稻叶片气体交换模拟模型建立了基础。25543 毕业论文关键词：水稻；光合作用；温度升高；CO2浓度升高 Elevated atmospheric CO2 concentration and the interaction of warming effects on rice photosynthesis Abstract：In order to study the effect of CO2 enrichment and temperature increase on photosynthesis of rice, rice (Oryza sativa L.) cultivar Nanjing 9108 was used as experimental material, and the open CO2 enrichment and temperature increase platform (Free Air CO2 Enrichment And the effects of CO2 concentration and temperature on the stomatal conductance, net photosynthetic rate, transpiration rate and water use efficiency of rice leaves under the conditions of CO2 concentration and temperature rise were studied in rice culture experiment with simulated CO2 concentration and temperature rise. The change. The results showed that the increase of CO2 concentration increased 4.13% and 13.89% in the upper and lower leaves of the stomatal conductance, but decreased significantly at 5.74% lower than that of CK. The net photosynthetic rate was the same as that of CK The results showed that the uptake rate was 6.37%, 3.46% and 11.46%, respectively. The water use efficiency increased by 4.33%, respectively, and the water use efficiency was decreased by 2.23%, 2.23% and 11.34%, respectively. 1.73% and 0.07%, the difference was not significant. The upper and lower leaves of the stomatal conductance increased by 74.45%, 73.14% and 48.61%, respectively. The net photosynthetic rate decreased by 7.65%, the median leaf increased by 4.50% and the lower leaf decreased by 0.20% , The difference was not significant; the transpiration rate decreased by 8.02%, 5.00% and 3.75%, respectively, and the difference between the middle and the lower leaves was not significant; the water use efficiency increased by 0.30% 9.19% and 2.67%, the difference was not significant. The interaction between uptake and uptake of leaf was 61.59% and 21.81%, 36.82% lower than that in upper leaf, and the difference was not significant And the net photosynthetic rate decreased by 15.96%, 10.75% and 63.45%, respectively, and the difference was not significant. The transpiration rate decreased by 22.09%, 25.91% and 65.69%, respectively, and the difference was not significant And the water use efficiency increased by 7.81%, 33.72% and 5.53%, respectively, and the difference was not significant. In this study, we established a basis for the further study of rice leaf gas exchange simulation model for further establishment of atmospheric CO2 enrichment and warming interaction. (责任编辑：qin) |