休眠期甜樱桃幼树体内氮素的运转  

Nitrogen transportation of young sweet cherry tree in dormant period

作　　者：李学强[1] 李秀珍[1] 吕德国[2] 张国海[1] 

机构地区：[1]河南科技大学林学院,河南洛阳471003 [2]沈阳农业大学园艺学院,沈阳110161

出　　处：《果树学报》2010年第1期127-130,共4页Journal of Fruit Science

基　　金：辽宁省博士起动基金项目(20001044);河南省科技攻关项目(0324070091)

摘　　要：以盆栽2a生甜樱桃庄园为试材,运用同位素示踪法研究了甜樱桃幼树在休眠期植株体内氮素的运转。结果表明,当年秋季吸收的15N积累趋势和总氮积累趋势一致,即根部大于地上部,而且更趋向于在根中积累。2005年12月8日与10月25日相比,芽、1a生木质、多年生木质、砧段木质、大根木质中氮含量减少,而1a生枝皮、多年生枝皮、砧段皮、大根皮、粗根、细根中氮含量增加,此期所有部位的NDFF值均降低。2006年2月12日与2005年12月8日相比除砧段皮氮含量降低外,其他部分的氮含量都有所增加,NDFF值均增加;与2006年2月12日相比,2006年4月21日芽、砧段皮、大根皮、细根的氮含量增加,各部位NDFF值均降低。秋季吸收的氮素可贮藏在根和枝干中,但贮藏在细根和粗根中的量大于枝干中的量。甜樱桃植株在休眠期间也具有吸氮能力,只是在不同的阶段其吸氮能力不同;同时此期氮素发生了再分配,由木质部运往皮部。2-year-old potted sweet cherry trees of Zhuangyuan cultivar were fertilized with 15N-labelled ammonium sulfate in autumn. The transportation of nitrogen in young sweet cherry tree in winter was studied using isotopic tracer technique. The accumulation tendency of 15N absorbed in autumn was in accordance with the accumulation tendency of total N,and 15N and total N accumulated in root were more than that in trunk and branch. Compared with October 25th,the nitrogen content in bud,one year old branch xylem,perennial branch xylem,rootstock stem xylem and big root xylem decreased,but the nitrogen content in one-year-old branch bark,perennial branch bark,rootstock stem bark,big root bark,thick root and fine root increased on December 8th. The NDFF values of all parts reduced in the period. Compared with December 8th,the nitrogen content in different parts （except rootstock stem bark） augmented and the NDFF values of all parts increased on February 12th. The nitrogen content in bud,rootstock stem bark,big root bark,fine root increased and the NDFF values of all parts reduced on April 21st. So we might get such conclusions：the nitrogen absorbed in autumn could be stored in root,trunk and branch,but the content stored in thick root and fine root was more than the content in trunk and branch. Sweet cherry tree had the ability to absorb nitrogen in dormant period,but the absorption ability was different in different dormant phase. And the nitrogen was transported to phloem from xylem at the same time.

关 键 词：甜樱桃 氮 运转 休眠期 

分 类 号：S662.5[农业科学—果树学]