关键词: 太阳辐射减弱, 臭氧(O3), 冬小麦, 磷含量, 分配, 转运

Abstract: The experiment was conducted to reveal the effects of the solar radiation attenuation and ozone (O3)concentration increasing on phosphorus concentration,distribution and translocation of winter wheat by using OTCs (open top chambers) and shade nets in field.The dynamic changes of phosphorus concentration in triticum aestivum different organs were measured in the growing/development (G/D) periods including jointing,booting,heading,filing,milking and mature stages.The results showed that (1)the concentration of phosphorus were promoted significantly in root,stem,leaf,spike when winter wheat suffered in shadow 20% (S1),40% (S2)and 60% (S3)(P<0.05),phosphorus distribution rate were reduced in root and spike but increased in leaf and stem(in late growth periods),the total output (P<0.01)and phosphorus transfer rate(P<0.05)of nutritorium were both decreased significantly,compared to natural background(2)Phosphorus concentration in root, stem,leaf(in late growth stages) and spike were promoted respectively under 100nL〖KG-*4〗·〖KG-*4〗L1 ozone stress(T), phosphorus distribution rate of milking ripe and mature stages in root and spike were reduced, but in stem and leaf were increased in the mature stage, phosphorus transfer in root, stem, leaf and nutritorium were debase very significantly(P<0.01), while phosphorus transfer rate in leaf and nutritorium were increased(3)Winter wheat suffered in shadow cooperate enhanced ozone condition, i e 100nL〖KG-*4〗·〖KG-*4〗L1+20% (TS1), 100nL〖KG-*4〗·〖KG-*4〗L1+40% (TS2) and 100nL〖KG-*4〗·〖KG-*4〗L1+60% (TS3), phosphorus concentration were improv〖JP+1〗ed in root, stem, leaf and spike organ, phosphorus transfer volume in root, stem, leaf and nutritorium were decreased very significantly(P<0.01), phosphorus distribution rate in spike organ and root(during booting and heading stage)(P<0.05)were drop, but in stem and leaf were go up in filling to mature stages(P<0.05). With the shadow intensity increased, the effects on phosphorus distribution rate in stem and spike showed growth trend, and the reduced solar irradiation and enhanced ozone showed synergy during milking ripe stage and mature stages

Key words: Reduced solar irradiance, Ozone(O3), Winter wheat, Concentration of phosphorus, Distribution, Translocation