| 白桦幼苗NH+4/NO-3吸收特征的研究 |
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| 引用本文： | 张韫,崔晓阳. 白桦幼苗NH+4/NO-3吸收特征的研究[J]. 北京林业大学学报, 2011, 33(3): 26-30 |
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| 作者姓名： | 张韫 崔晓阳 |
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| 作者单位： | 东北林业大学林学院 |
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| 摘 要： | 采用水培方法，研究白桦幼苗氮吸收特征。结果表明:白桦早期对NO-3 N呈偏向选择吸收，供氮强度和光强增加使苗木氮吸收总量、NH+4 N吸收量、NO-3 N吸收量增加。根系是白桦早期还原NO-3的主要部位；根系和叶片硝酸还原酶活性均因供NO-3强度和光强的增加而增强。较低供氮水平下，NH+4优势处理苗木的营养液pH值下降，NO-3优势处理苗木的营养液pH值上升；氮吸收量增大导致NH+4优势处理苗木的营养液pH值下降程度深化，而供NO-3营养液pH值却未因此进一步升高；较高光强下，各处理苗木营养液pH值均有不同程度下降。
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| 关 键 词： | 白桦幼苗 NH+4 NO-3 硝酸还原酶 pH值 |
| 收稿时间： | 1900-01-01 |
NH_4~+/NO_3~- absorption characteristics of Betula platyphylla seedlings |
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| ZHANG Yun,CUI Xiao-yang. NH_4~+/NO_3~- absorption characteristics of Betula platyphylla seedlings[J]. Journal of Beijing Forestry University, 2011, 33(3): 26-30 |
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| Authors: | ZHANG Yun CUI Xiao-yang |
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| Affiliation: | College of Forestry, Northeast Forestry University, Harbin, 150040，P. R.China. |
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| Abstract: | We investigated NH+4/NO-3 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 NH+4 - -N,NO-3 - - 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 decre... |
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| Keywords: | NH4+ NO3- |
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