摘要
以4年生盆栽沾化冬枣树为试材,研究其对萌芽前土施15N-尿素的吸收、分配和利用特性。结果表明:沾化冬枣萌芽前施15N-尿素,根系吸收15N肥后优先分配到贮藏器官(包括主干、多年生枝和粗根)中,然后外运用于植株新生器官(包括枣吊及其叶片、新生营养枝、细根和果实)建造,与贮藏氮利用特性相似;果实采收后,树体内的15N开始向贮藏器官回流。萌芽前施的15N-尿素根系吸收后,15N在树体内的运转分配主要随生长中心的转移而转移。幼叶期解析时,15N在贮藏器官粗根和主干木质部中的分配势(Ndff%)最强;盛花期解析时,15N在枣吊叶片(包括花)中的分配势最强;果实速长期解析时,15N在果实中的分配势最强;果实采收后解析时,15N在根系中的分配势最强。随着冬枣生长发育,植株对15N-尿素的吸收利用率逐渐上升,在果实速长期时达到最高,采果后略有下降。
The characteristics of the absorption, distribution and utilization to ^15N-urea fertilizer before bud-break were studied using four-year-old pot-cultivated Ziziphus jujuba var. inermis ＇ Zhanhua-Dongzao＇ tree. The main results were as follows ： ^15N urea applied before bud-break had the feature of the effect of stored N in dongzao trees. That is to say, ^15N absorbed by root was distributed firstly and mostly to the storage organs （ including the trunk, the perennial branch and the large root）, then to the construction of the new organs （including the deciduous spur and leaf, neonatal branch, fine root and fruit）, and began to flow back to the storage organs after fruit harvest. The ^15N-urea applied before bud-break was mainly transloeated to the growth centre. Analysed during the leaflet, Ndff% of ^15N-urea was highest in the large root and xylem of the trunk. During full blossom, Ndff% of the leaf of deciduous spur （including flower） became the highest. During the rapid fruit growth, Ndff% of the fruit became the highest. And analysed after fruit harvest, Ndff% of the root became the highest. With the development of the tree, the ratio of utilization to ^15N-urea increased gradually, in the rapid fruit growth phase it was the highest,and after fruit harvest it decreased appreciably.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2006年第1期22-25,共4页
Scientia Silvae Sinicae
基金
"948"重大项目(2003-Z53)资助
关键词
沾化冬枣
^15N-尿素
萌芽
分配
利用
Ziziphus jujuba var. inermis ‘Zhanhua-Dongzao＇
^15N-urea
bud-break
distribution
utilization
