北京林业大学学报2011，Vol.33Issue(3)：26-30,5.
白桦幼苗NH4+/NO3-吸收特征的研究
NH4+/NO3- absorption characteristics of Betula platyphylla seedlings.
摘要
Abstract
We investigated NH4+/NO3- absorption characteristics of Betula platyphylla seedlings using solution cultivation. The results showed that the seedlings preferred nitrate over ammonium in their nutrient regime. Absorption capacity of NH4+ -N, NO3- -N and total N increased with the increase of nitrogen application or light intensity. Most of nitrate was reduced in roots; nitrate reductase activity in roots and leaves responded to increased nitrate availability or increased light intensity. Medium pH value decreased in the low N-application solution of high NH4+/NO3- ratio, and increased with low NH4+/NO3- ratio; medium pH value decreased more markedly in the high N-application solution of high NH4+ /NO3- ratio, but did not increase sharply in NO3- solution; medium pH value of all the seedlings decreased with increased light intensity.关键词
白桦幼苗/NH4+/NO3-/硝酸还原酶/pH值Key words
Betula platyphylla seedlings/ NH4+ /NO3-/ nitrate reductase/ pH value分类
农业科技引用本文复制引用
张韫,崔晓阳..白桦幼苗NH4+/NO3-吸收特征的研究[J].北京林业大学学报,2011,33(3):26-30,5.基金项目
国家自然科学基金项目(30371146、30571476). （30371146、30571476）
