摘要
夏玉米 ( Zea mays L .)植株硫的百分含量在一生中呈现前期高、后期低的变化趋势 ,有两个吸硫高峰期分别为 :拔节—大口、开花—乳熟期 ,分别占生育期吸收总量的 2 6.18%和 2 5.14%。拔节到大口期吸硫强度最大达 0 .4 39kg/ hm2·d,开花后仍保持较高的吸硫强度 (为 0 .184 kg/ hm2· d) ,形成百公斤籽粒需硫量为 0 .186kg。植株硫开花前主要分布在叶片、茎秆和叶鞘中 ,开花后分配转向以籽粒为主 ,籽粒中的硫有 2 6.19%来自其他器官的转移 ,其中对籽粒贡献最大的是叶片 ,开花后中上部叶片保持较高的含硫量、对硫的转移少 。
Sulfur (S) percentage concentration varied from high at early growth stage to lo w at late growth stage. S mainly existed in leaves, stems and sheaths before flo wering and then in grain. Two high peaks of absorbed S amount were in periods fr om the jointing to male tetrad and from the anthesis to maturity, their accumula tion was 26.18% and 25.14% of total S. S absorption rate maximized up to 0.439 k g ·ha -1 ·day -1 from Jointing to male tetrad and maintained 0.184 kg·ha -1 ·day -1 after anthesis. S amount which was needed for th e formation of 100 kg grain was 0.168 kg, where 26.19% of S was translocated fro m other organs, especially from leaves. The middle and upper leaves contained mor e S and contributed less for the translocation of S to grain, but low leaves wer e opposed to them.
出处
《作物学报》
CAS
CSCD
北大核心
2000年第6期899-904,共6页
Acta Agronomica Sinica
基金
国家自然科学基金资助项目 !(批准号 :39870 52 5)
