臺灣大學校園與農場中不同植物之硝酸還原酶活性與其氮含量的關係

氮是影響植物生長最重要之無機營養元素，植物之生長需適當量之氮供應。旱地植物以利用硝酸態氮為主。本研究之目的為比較臺灣大學校園內不同的二十種植物枝葉中硝酸還原酶活性與其總氮濃度、硝酸態氮濃度之差異與其間的關係，以瞭解無施肥下植物之氮利用。在校園內採取十二種木本植物之成熟葉，八種草本植物之整個植株，分別分開不同的部分，測其硝酸還原酶活性及總氮與硝酸態氮的濃度。其結果顯示所採的十二種木本植物地上部硝酸態氮含量與硝酸還原酶活性均低，總氮含量則與硝酸還原酶活性呈現顯著的正相關。八種草本植物之硝酸還原酶活性亦低，但是平均而言，高於木本植物者；草本植物之硝酸還原酶活性則因植物種類而有較大之不同。鬼針草之硝酸還原酶活性為所測植物中之最高者，此應可說明鬼針草之快速繁殖特性。

關鍵字

硝酸還原酶；硝酸態氮；總氮；臺大校園植物

並列摘要

Nitrogen (N) is the most important mineral element that affecting the plant growth. It is necessary to supply adequate amount of N for plant growth. The major source of N for plant growing in upland soil is nitrate N. The purpose of this study was to investigate the relationships between the nitrate reductase (NRase) activities, nitrate N concentrations and total N concentrations of various parts of twenty different plants in the campus of National Taiwan University. Twelve woody plants and eight herbaceous plants were included in this study. The recently matured leaves of woody plants and the whole herbaceous plants were sampled to determine the NRase activities, total N and nitrate N concentrations. The results show that the NRase activities and nitrate N concentration of most of the plants studied were low. There was a significantly positive correlation between the total N concentrations and NRase activities in the woody plants. The nitrate N concentrations and NRase activities of herbaceous plants were also low. In general, the NRase activities of herbaceous plants were higher than that of woody plants. The NRase activities of herbaceous plants were different with different plants. The NRase activity of Bidens bipinnata L. (Bide1, M) was high compared with the other plants studied, which may be one of the reason for its high growth rate.

並列關鍵字

nitrate reductase ； nitrate nitrogen ； total nitrogen ； plants in NTU

國際替代計量

臺灣大學校園與農場中不同植物之硝酸還原酶活性與其氮含量的關係

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