摘要
采用液体培养试验 ,利用15N示踪技术 ,研究了在不同氮源条件下生菜硝酸盐的还原特性 .结果表明 :当营养液中的硝态氮源被其它氮源形态替代以后 ,其硝酸盐含量均得到降低 ,其中以停供氮源降低最多 ;当营养液中继续有硝态氮存在时 ,原累积在生菜体内的硝态氮较新吸收进入的硝态氮难以还原 ,且因继续吸收而累积的硝态氮与原累积的硝态氮在分布上存在差异 ,前者易于累积在代谢活动旺盛的部位 ;在硝铵态氮源条件下原累积硝态氮的还原率又较硝态氮源条件下大 ,而新吸收的硝态氮则相反 .
Solution culture experiment was conducted and 15 N tracer technology was used for studying nitrate reduction characteristic under different nitrogen source supplied. The results indicated that NO 3-N concentration of leaf lettuce was reduced when NO 3-N source in nutrition solution was replaced by other types of nitrogen source, and the largest NO 3-N reduction placed with no nitrogen source supplied. The original accumulated NO 3-N was more difficult to reduce than new absorbed when NO 3-N or NO 3-N/NH + 4-N source supplied. There also existed the distribution difference in different parts of plant between original and new accumulated NO 3-N . It was found that the new accumulated NO 3-N was mainly distributed in parts which metabolism is vigorous. The reduction percentage of original accumulated NO 3-N with NO 3-N/NH + 4-N source supplied was larger than that of with NO 3-N source supplied, but for new absorbed NO 3-N , it was reverse.
出处
《仲恺农业技术学院学报》
2001年第1期18-21,共4页
Journal of Zhongkai Agrotechnical College
基金
广东省农业科学院博士启动基金
