摘要
为探讨甘蔗/木薯间作系统中甘蔗的固氮量变化及氮素向木薯的转移情况。利用15N同位素稀释法进行田间示踪试验。结果表明:单作下甘蔗的固氮百分率为29.50%,固氮量为11.31 g/m2。间作下甘蔗的总固氮百分率为36.43%,它包括供甘蔗自身生长需要的固氮百分率29.90%和转移到木薯的固氮百分率6.53%;间作下甘蔗的固氮量为17.82 g/m2,其中82.07%用于自身生长需要,17.93%转移给木薯利用。间作木薯的总氮量中21.42%来自甘蔗固氮。此结果表明在单作和间作下甘蔗固氮对自身贡献的大小基本一致。甘蔗/木薯间作对甘蔗固氮有促进作用,但促进部分转移给木薯利用。
The biological nitrogen fixation in sugarcane and the fixed nitrogen transfer from sugarcane to cassava in an intercropping system were investigated.15N isotope dilution technique was used in this experiment.The experimental results showed that the nitrogen fixation rate and the nitrogen fixation amout was 29.50%,11.31 g/m2 respectively under sole sugarcane planting.In the sugarcane-cassava intercropping system,the nitrogen fixation rate was 36.43%,including 29.90% in sugarcane for its growth utilization and 6.53% in cassava transferred from sugarcane;and the nitrogen fixation amount was 17.82 g/m2,in which 82.07% for sugarcane growth and 17.93% for utilization in cassava.It is concluded that sugarcane plants received the same amount of nitrogen from biological fixation in both sole planting and intercropping systems,but it could fix more nitrogen and transfer to cassava in the sugarcane-cassava intercropping system.
出处
《热带作物学报》
CSCD
北大核心
2012年第2期199-206,共8页
Chinese Journal of Tropical Crops
基金
农业部948项目(No.2009-Z8)
国家自然科学基金项目(No.30660085)
国家科技支撑计划项目(No.2007BAD30B03)
科技部国际合作项目(No.2008DFA30600
No.2009DFA30820)
广西自然科学基金创新研究团队项目(No.2011GXNSFF018002)
广西科技攻关项目(桂科能0815011)
关键词
甘蔗
木薯
间作系统
15N同位素稀释法
固氮百分率
Sugarcane
Cassava
Intercropping system
15N isotope dilution technique
Nitrogen-fixing percentage
作者简介
周晓舟（1963年-），女，博士研究生。研究方向：作物化控及生理。
通讯作者：李杨瑞，E-mail：liyr@gxaas．net。
