%0 Journal Article
%T Transport and redistribution of nitrogen at late growth stages in different oilseed rape cultivars<br>不同品种油菜生长后期体内氮素转运 及再分配差异研究
%A YANG Ming
%A SONG Hai-Xing
%A XU Hao-Ran
%A LIU Qiang
%A RONG Xiang-Min
%A ZHU Zhao-Kun
%A WANG Xiao-Juan
%A YANG Lan
%A <br>杨 明
%A 宋海星
%A 徐浩然
%A 刘 强
%A 荣湘民
%A 朱兆坤
%A 王小娟
%A 杨 兰
%J 中国生态农业学报
%D 2012
%I 
%X This paper used 15N tracer method in sand culture conditions to determine the physiological factors of N redistribution and its relationship with N utilization efficiency. The paper also studied the differences in N distribution, transshipment and loss under different N levels in different N-efficient oilseed rape cultivars. The results showed that different N levels had different outputs in terms of biomass, grain yield, grain N content, plant N content, plant total N, grain total N, harvest index, accumulated N and N harvest index of selected oilseed rapes. Under normal N level, oilseed rape cultivar "742" had higher biomass, grain yield, grain total N, harvest index and N harvest index than cultivar "814". However, rape cultivar "742" had lower grain N content, plant N content and plant total N than "814" at low N level. Oilseed rape cultivar "742" had higher plant N content, grain N content, harvest index and N harvest index at peduncle growth stage than "814". At harvest stage, however, "742" had lower biomass, grain yield, plant total N and grain total N than "814". 15N tracer method results showed decreasing N amount in vegetable organs and the proportions and redistributions of N in propagative organs were significantly different. Under different N levels, N decline in root and stem in cultivar "742" was higher than in "814". This difference was especially evident in the stems of the oilseed rape cultivars. Under normal N level, the proportions of N decline in roots and leaves were lower in cultivar "742" than in "814". However, the proportion of N decline in stems was much higher in cultivar "742" than in "814". Under low N level, the proportion of N decline in all vegetable organs was highest in cultivar "742". Under normal or low N levels, less N was redistributed to silique husk of cultivar "742" than in cultivar "814". However, more N was redistributed to grain of "742" than "814". T-test showed that the amounts of redistributed N were significantly different, except for silique husk under normal N level. This implied that N redistribution from vegetative organs benefited N use efficiency. Furthermore, with normal N level, N loss and proportion in oilseed rape cultivar "742" were higher than in "814", and the reverse was the case for low N level.
%K Oilseed rape
%K Harvest index
%K 15N tracer method
%K Nitrogen translocation
%K Nitrogen redistribution
%K Nitrogen loss<br>油菜
%K 收获指数
%K 15N示踪技术
%K 氮素转运
%K 氮素再分配
%K 氮素损失
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=03F54A49DE00578AA0E5DDF5BC021AA7&cid=1A8B5357F0EF07B8&jid=AB3ABF502E2E1FF39F0E3B80164C9031&aid=3A6C308391582FF4117942EAEE50819D&yid=99E9153A83D4CB11&vid=A04140E723CB732E&iid=F3090AE9B60B7ED1&sid=80AD5907B47936EE&eid=5A700C739C4FF128&journal_id=1671-3990&journal_name=中国生态农业学报&referenced_num=0&reference_num=0