CO_(2)浓度升高和有机肥-化肥施用对水稻光合作用、抗氧化酶活性和重金属含量的影响

Effects of increasing CO_(2) concentration and application of organic fertilizer and chemical fertilizer on photosynthesis,antioxidant enzyme activity and heavy metal content of rice

依托中国水稻FACE平台(Free air CO_(2)enrichment),研究了化肥和50%有机肥等氮替代化肥2种施肥方式下,大气CO_(2)浓度升高(环境大气+200μmol/mol)对水稻光合作用、抗氧化酶活性以及铜和锌吸收的影响。结果表明,单独大气CO_(2)浓度升高显著增加了抽穗期水稻叶片的净光合速率、丙二醛含量和成熟期水稻子粒中锌含量,但显著降低了抽穗期水稻叶片气孔导度和抗氧化酶活性。50%有机肥等氮替代化肥处理下,对比正常大气CO_(2)浓度,大气CO_(2)浓度升高显著增加了过氧化物酶活性,但降低了水稻叶片气孔导度和蒸腾速率、丙二醛含量和水稻子粒中铜和锌含量。因此,50%有机肥等氮替代化肥有助于提高水稻对CO_(2)浓度升高的适应性。

Relying on China's Rice FACE Platform(Free air CO_(2) enrichment),under two fertilization methods,namely,fertilizer and 50%organic fertilizer instead of chemical fertilizer,the effects of increasing atmospheric CO_(2) concentration(ambient atmosphere+200μmol/mol)on photosynthesis,antioxidant enzyme activity and copper and zinc absorption in rice were studied.The results showed that increasing CO_(2) concentration significantly increased the net photosynthetic rate,and malondialdehyde content in rice leaves at the heading stage and zinc content in rice grains at the maturity stage,but significantly decreased the stomatal conductance and antioxidant enzyme activities of rice leaves at the heading stage.Under the treatment of chemical fertilizer replaced by 50%organic fertilizer(COF),compared with the normal atmospheric CO_(2) concentration,the increase of atmospheric CO_(2) concentration significant⁃ly increased the peroxidase activity,but decreased the stomatal conductance and transpiration rate of rice leaves,the content of malo⁃ndialdehyde and the contents of copper and zinc in rice grains.Therefore,the substitution of chemical fertilizer with 50%organic fertil⁃izer at equal nitrogen application could help to improve the adaptability of rice to the increase of CO_(2) concentration.