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作 者 ：贾朋, 王力朋, 何茜, 李吉跃, 苏艳

期 刊 ：核农学报 2016年 30卷 4期 页码：776-782

关键词：楸树；15N示踪；氮肥利用率；Ndff；分配率；

Keywords:Catapla bungei, 15N trancer, nitrogen use efficiency, Ndff, allocation rate,

摘 要 ：为探讨楸树无性系对氮素的吸收、分配及利用特性,以2年生楸树无性系015-1、1-3、7080、1-4和004-1组培苗为试验材料,应用¹⁵N示踪技术对楸树无性系进行施肥试验。结果表明,5个楸树无性系氮肥的吸收率、利用率及分配率具有较强的一致性,氮肥利用率介于27.14%~31.24%之间。楸树无性系根和叶的肥料氮比例(Ndff)明显大于茎,楸树无性系根和叶对氮肥的竞争力较强,茎对氮肥的竞争力最弱。015-1茎部氮素分配率及无性系7080根部氮素分配率明显高于其他4个无性系;氮素分配率在各个器官中差异显著,叶片氮素的分配率最高,总体趋势为叶>根>茎。本研究结果为楸树氮肥的合理施用提供了理论依据。

Abstract:In this study, experments with tissue culture seedlings of two-year-old Catapla bungei clones (015-1,7080,1-4 and 004-1) were conducted to explore the seedlings’ characteristics of absorption, utilization and allocation of nitrogen. By using the stable isotope¹⁵N tracer, we measured the absorption, nitrogen use efficiency (NUE) and allocation rates were measured under an exponential fertilization trial. The results were as follows: the nitrogen absorption, NUE and allocation rates of the five C. bungei clones all exhibited a high consistency, with NUE ranging from 27.14% to 31.24%. The NDFF of roots and leaves of C. bungei clones were significantly higher than stems. The roots and leaves were more competitive than stems for nitrogen fertilizer. The nitrogen allocation rate in the stem of C. bungei clone 015-1, as same as in the root of C. bungei clone 7080, were significantly higher (p<0.05) than the other clones. There was significant difference (P<0.05) among the nitrogen allocation rates in the three organs. In general, the allocation rates in the three organs followed the order of leaves roots stems. These findings provide a scientific basis for rational application of nitrogen fertilizer of C. bungei.

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