CAJ | 학술논문

通过半开顶式CO2人工气候室，研究了CO2浓度升高（360、540μmol·mol－1和720μmol·mol－1）与不同氮肥营养（0、150、300 kg·hm－2和450 kg·hm－2）相互作用对蕾铃期棉花－土壤氮含量变化及棉花氮素吸收的影响，结果显示：大气CO2浓度增加，高氮肥处理下棉花叶片、蕾铃中氮含量显著降低，茎秆、根系中氮含量增加，棉花整株氮含量表现为下降；相同的CO2浓度下，随着氮素营养的增加棉花各器官氮积累量呈增加趋势，其中蕾铃、叶片氮积累量较高，茎秆、根系氮积累量相对较少，说明CO2浓度增加与增施氮肥促进了土壤氮素向植株叶片和生殖器官运输。通过对土壤无机氮含量的测定分析，CO2浓度升高为540μmol·mol－1，各施氮水平下棉田土壤NO3－-N含量显著降低，NH4＋-N含量在低氮水平下有少量增加，在高氮水平下表现为降低；CO2浓度升高为720μmol·mol－1，土壤NO3－-N含量表现为降低，NH4＋-N含量呈增加趋势。研究表明：大气CO2浓度增加且浓度范围在500～720μmol·mol－1，增加氮肥施用量可有效促进棉花对氮素养分尤其是NO3－-N的吸收利用。
통과반개정식CO2인공기후실，연구료CO2농도승고（360、540μmol·mol－1화720μmol·mol－1）여불동담비영양（0、150、300 kg·hm－2화450 kg·hm－2）상호작용대뢰령기면화－토양담함량변화급면화담소흡수적영향，결과현시：대기CO2농도증가，고담비처리하면화협편、뢰령중담함량현저강저，경간、근계중담함량증가，면화정주담함량표현위하강；상동적CO2농도하，수착담소영양적증가면화각기관담적루량정증가추세，기중뢰령、협편담적루량교고，경간、근계담적루량상대교소，설명CO2농도증가여증시담비촉진료토양담소향식주협편화생식기관운수。통과대토양무궤담함량적측정분석，CO2농도승고위540μmol·mol－1，각시담수평하면전토양NO3－-N함량현저강저，NH4＋-N함량재저담수평하유소량증가，재고담수평하표현위강저；CO2농도승고위720μmol·mol－1，토양NO3－-N함량표현위강저，NH4＋-N함량정증가추세。연구표명：대기CO2농도증가차농도범위재500～720μmol·mol－1，증가담비시용량가유효촉진면화대담소양분우기시NO3－-N적흡수이용。
Semi-open-top artificial climate chamber is designed to study the effects of elevated CO2 concentration (360 ,540 μmol·mol-1 and 720 μmol·mol-1 ) and different nitrogen fertilizer application (0 ,150 ,300 kg·hm-2 and 450 kg·hm-2 ) on nitrogen distribution of bud stage“cotton-soil”system .The results showed that ,when CO2 concen-tration elevated to 540 μmol·mol-1 ,the total N content of cotton leaves and buds decreased significantly under high ni-trogen levels (300 ,450 kg·hm-2 ) ,but the total N content of cotton stems and roots increased slightly at different nitro-gen levels ,the whole cotton N content decreased and the decline proportion of elevated CO2 (540μmol·mol-1 ) treatment was greater than the elevated CO2 (720 μmol·mol-1 ) .Under the same CO2 concentration ,the total N content of cotton plant had an increasing tendency accompanied by increase of nitrogen application rate ,and nitrogen accumulation in cot-ton buds and leaves was more than that in cotton stems and roots .This showed that elevated CO2 concentration interacted with nitrogen fertilizer application to promote underground nitrogen nutrients transporting to cotton leaves and buds .The determination of soil NH4+-N and NO3 --N of cotton field found that the effects was significant with elevated CO2 concen-tration on soil nitrogen content ( P<0 .05 ) .Compared with the ambient CO2 ,when CO2 concentration elevated to 540μmol·mol-1 ,cotton field soil NO3 --N content decreased significantly at different nitrogen levels ,but soil NH4+-N con- <br> tent increased slightly under low nitrogen levels (0 ,150 kg·hm-2 ) and decreased under high nitrogen levels (300 ,450 kg·hm-2 );when CO2 concentration elevated to 720 μmol·mol-1 ,the soil NO3 --N content still decreased but the de-cline proportion was lower than elevated CO2 (540 μmol·mol-1 ) ,and soil NH4+-N content tended to increase .This study concluded that when CO2 concentration elevated to 500~700μmol·mol-1 ,increasing nitrogen fertilizer application level (300 kg·hm-2 ) on cotton field could significantly promote cotton absorbing N especially NO3 --N nutrient .