摘要
盆栽条件下利用15N示踪技术,研究不同时期施15N-尿素,对沾化冬枣15N的吸收利用及分配特性的影响。结果表明:生长季前期(萌芽前和花前)施用15N-尿素,经根系吸收后,15N优先分配到贮藏器官(包括主干、多年生枝和粗根)中,然后外运用于树体新生器官(包括枣吊及其叶片、新生营养枝、细根及果实)的形成,果实采收后15N开始向贮藏器官回流;果实硬核期15N直接用于树体营养生长和生殖生长,而不是先贮藏再利用;果实速长期15N优先向贮藏器官中积累;萌芽前施15N在树体内的运转规律符合落叶果树贮藏N营养分配规律,优先转运到生长中心。随着施肥期的后延,植株对15N-尿素的当季利用率逐渐下降。
The technique of isotope 15 N-labelled urea is used to study the characteristics of 15 N absorption, partition and translocation of‘Zhanhua Dongzao’jujube in different fertilizer application stages under the potted condition. The results showed that: Fertilized before sprout and before full-bloom, 15 N absorbed by the root was distributed preferentially to the storage organs (including the trunk, the perennial spurs and the large root),then was transported to the use of the new organs construction (including the deciduous spur and its leaf, the neonatal branches, the fine root and the fruit), and after fruit harvest 15 N was started to circumfluent to storage organs again. Fertilized during fruit core-hardening, 15 N was transported not directly to the storage organs, but to the reproductive organs and nutritional organs. And fertilized during fruit rapid growth, 15 N was distributed firstly and preferentially to the storage organs. When 15 N-urea was fertilized before sprout in jujube trees the rule that 15 N was translocated firstly to the growth center was in accordance with storage N distribution rule of deciduous fruit trees. And with the delay of 15 N-urea application stage, 15 N utilization rate of the plant decreased gradually.
出处
《园艺学报》
CAS
CSCD
北大核心
2005年第2期288-291,共4页
Acta Horticulturae Sinica
基金
山东省博士后基金项目(0223035)
国家自然科学基金项目(30370838)
农业部‘948’项目(2003Z53)
关键词
枣
^15N
施肥期
分配
运转
Jujube
15 N
Fertilizer application stage
Distribution
Translocation
