CAJ | 학술논문

为了解恩施烟区植烟黄棕壤供氮能力和不同生长期烟株各器官从土壤和肥料氮源吸收情况,采用15N示踪法研究烤烟不同生育时期各器官氮含量和积累量.结果表明,烟株各器官氮含量随生育期逐渐降低,氮含量表现为杈>上部叶>中部叶>下部叶>茎、根,到收获末期上中下部叶分别在2.850%,2.524%和2.322%水平稳定下来.烟杈的去留对烟叶氮调控影响很大.除杈外其它器官氮含量在移栽后两个半月停止快速下降进入小幅波动期.上中下部叶从两种氮源积累氮的趋势不同,上部叶在烟草生育中后期积累两种氮持续升高并土壤氮随生育期推进而比例增加;随生育期推进中部叶两种氮均平稳积累,下部叶两种氮则下降.下部叶比上部和中部叶延长半个月吸收更多肥料氮.恩施土壤氮对烟株氮积累贡献率较大,不同部位叶片对土壤氮和肥料氮的吸收积累时期和积累规律不同,上部和中部叶受土壤氮影响更大,烟杈可调控其它器官氮含量.
위료해은시연구식연황종양공담능력화불동생장기연주각기관종토양화비료담원흡수정황,채용15N시종법연구고연불동생육시기각기관담함량화적루량.결과표명,연주각기관담함량수생육기축점강저,담함량표현위차>상부협>중부협>하부협>경、근,도수획말기상중하부협분별재2.850%,2.524%화2.322%수평은정하래.연차적거류대연협담조공영향흔대.제차외기타기관담함량재이재후량개반월정지쾌속하강진입소폭파동기.상중하부협종량충담원적루담적추세불동,상부협재연초생육중후기적루량충담지속승고병토양담수생육기추진이비례증가;수생육기추진중부협량충담균평은적루,하부협량충담칙하강.하부협비상부화중부협연장반개월흡수경다비료담.은시토양담대연주담적루공헌솔교대,불동부위협편대토양담화비료담적흡수적루시기화적루규률불동,상부화중부협수토양담영향경대,연차가조공기타기관담함량.
Experiments were conducted to investigate nitrogen (N) supply capacity of tobacco-planted soil in Enshi and N accumulation in different parts of tobacco plant using 15N isotope labeling technique. Results indicated that N content decreased after transplanting, with descending order of suckers>middle leaves>lower leaves>stem and root. N content in upper-middle-lower leaves were 2.850%, 2.524%and 2.322%, respectively. Tobacco sucker effected 1N accumulation in other parts of tobacco plant. Trend of N accumulation from soil and from fertilizer in different leaves differed. N content of upper leaves increased continually until late growth stage with more N from soil than from fertilizer. Lower position leaves absorb more fertilizer N than upper and middle leaves. It is concluded that tobacco-planting soil in Enshi contributed more N supply.