光氮互作对草地早熟禾碳氮代谢的影响

以草地早熟禾的3个品种为试验材料,研究了高低光照下不同的施氮水平对植株体内碳氮代谢的影响。对可溶性糖和硝酸还原酶的含量测定结果显示:高低光强下早熟禾的氮素同化能力均随着氮水平的升高呈现先升高后降低的趋势,碳代谢的中间产物可溶性糖随着氮水平的升高呈现先降低后升高的趋势,高低光下糖的含量随着氮水平的升高其品种间差异逐渐减小;在低氮条件下,植物的氮素同化能力较弱,光合碳代谢相对较强,糖含量较高,随着氮水平的增大,光合产物逐渐流向氮素代谢,硝酸还原酶含量升高。

Effects of Light Condition and Nitrogen Supply on Carbon -Nitrogen Metabolism of Poa pratensis L.

The influence of different nitrogen supply and light intensity on three Poa pratensis varieties of Carbon-Nitrogen metabolism were studied by meaturing some index such as soluble sugar and nitrate reductase.The results showed that ability of nitrogen assimilation increased first and then decreased.However,middle product such as soluble sugar was inverse.The difference in soluble sugar between high light and low light decreased as nitrogen supply increased.Nitrogen metabolism ability was decreased under low nitrogen,photosynthesis was very strong relatively and sugar contents were higher.More photosynthetic production were distributed into nitrogen assimilation as nitrogen supply inceased,nitrate reductase was increased.