能源植物荻秋季各器官中的氮素动态

为揭示能源植物荻(Triarrhena sacchariflora)秋季地上部各器官中氮素是否存在回流特征,对田间自然生长的荻进行连续取样,并测定不同器官中氮素含量。结果表明:在取样时间范围内,1)荻穗中氮素含量最高,而茎中则最低;2)取样末期较取样初期荻穗、茎和叶片中氮素含量分别显著(P<0.05)降低了69.97%、33.62%和32%,而根茎和根中氮素含量分别显著(P<0.05)增加了63.86%和19.90%;3)穗和茎中氮素的回流在种子形成后开始,且持续时间较长,而叶片中氮素的回流发生时间较晚,但在霜降前快速完成。总之,能源植物荻秋季地上部各器官中氮素会逐渐转运到地下部根和根茎中,表现出明显的回流特征。

Nitrogen dynamic of different organs of the energy plant Triarrhena sacchariflora during autumn

The objective of this study was to determine whether nitrogen re-translocation was present in the above-ground organs of Triarrhena sacchariflora during autumn.A successive sampling of the energy plant T.sacchariflora was conducted during autumn,and the nitrogen contents in different organs were determined.The results showed that(1)the nitrogen contents in the panicle and stem were the highest and lowest,respectively,among all organs;(2)the nitrogen contents in the panicle,leaf,and stem exhibited gradual decreases,while gradual increases were found in the root and rhizome over time.And the nitrogen contents of the panicle,leaf,and stem samples required at the last time were significantly(P<0.05)lower by 69.97%,33.62%,and 32.00%,respectively,when compared with the initial values.The nitrogen contents of the root and rhizome samples required at the last time were significantly(P<0.05)higher by 63.86%and 19.90%,respectively,when compared with the initial values;(3)The nitrogen re-translocation of the panicle and stem began after seed formation and lasted longer than that in leaf,while the nitrogen re-translocation of the leaf began later and finished before the first frost.In conclusion,there was obvious nitrogen re-translocation in the above-ground organs of the energy plant T.sacchariflora.