生态学报2024，Vol.44Issue(13)：5583-5595,13.DOI:10.20103/j.stxb.202401140123
不同施肥措施臭氧浓度升高对不同水稻品种光合特性的影响
Effects of elevated ozone on the photosynthesis of different rice cultivars under different fertilization measures
摘要
Abstract
Ground-level ozone(O3)has seriously threatened crop production in China,and the fertilization can regulate soil nutrient balance,thereby promoting crop growth.This study was conducted in open top chambers,using two O3 treatments(ambient air(NF)as control;ambient air+40 nmol/mol O3(NF40)).Three fertilizer treatments were nested under each O3 treatment,including conventional application of inorganic fertilizer(Ino,270 kg N hm-2 a-1),30％reduction of inorganic fertilizer(Red,189 kg N hm-2 a-1),and combination of organic and inorganic fertilizer(Com,Red+5000 kg hm-2 a-1 chicken manure).The photosynthetic parameters of two rice cultivars(HLY898 and NJ9108)at different growth stages were measured,which mainly explored the effects of O3 on the photosynthetic and physiological processes of rice at different growth stages under different fertilizer treatments.The results showed that NF40 had no significant effect on the saturated photosynthetic rate(Asat)during the vegetative growth stage of rice,but it significantly reduced the Asat during the filling stage of rice.Based on the slopes of the relationship between the relative reduction of Asat and SPAD of two rice cultivars with the O3 cumulative index,it was found that the hybrid rice cultivar HLY898(slopes of Asat and SPAD:-1.55 and-0.98,respectively.)was more sensitive to O3 than the conventional rice cultivar NJ9108(slopes of Asa,and SPAD:-0.92 and 0.06,respectively.).In addition,based on the results for the stomatal conductance(gs)and intercellular carbon dioxide concentration(Ci)of rice under different O3 treatments,we found that the decrease photosynthesis caused by O3 in NJ9108 was mainly attributed to non-stomatal limitations,while the decrease in photosynthesis of HLY898 was limited by both stomatal and non-stomatal factors.Compared with the Ino treatment,the Red treatment significantly inhibited Asat in the two rice cultivars by reducing leaf SPAD,but there was no significant difference in Asat between the Ino and Com treatments.This suggested that the combined application of organic and inorganic fertilizers could partially alleviate the decrease in rice photosynthesis caused by reduced application of inorganic fertilizers.There was no significant interactive effect of O3 and fertilizer treatment on all photosynthetic parameters of the two rice cultivars,indicating that short-term combination of organic and inorganic fertilizers could not effectively alleviate the negative effects of O3 on crops.The research results can provide a theoretical basis for mitigating crop yield reduction caused by O3 through reasonable nitrogen fertilizer management measures in farmland under O3 pollution.关键词
臭氧/有机无机肥配施/水稻/光合生理/剂量关系Key words
ozone/combined application of organic and inorganic fertilizers/rice/photosynthetic physiology/dose relationship引用本文复制引用
张涵,田彤彤,尚博,冯兆忠..不同施肥措施臭氧浓度升高对不同水稻品种光合特性的影响[J].生态学报,2024,44(13):5583-5595,13.基金项目
国家自然科学青年基金项目(42107270) （42107270）
国家自然科学基金面上项目(42377117) （42377117）
