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作 者 ：穆宏平;叶万辉;陈贻竹;朱建玲;曹洪麟

期 刊 ：武汉植物学研究 2008年 26卷 5期 页码：514-519

关键词：气体交换；羧化效率；生物量分配；叶面积比；色素含量；氮含量；磷含量；

Keywords:Gas exchange, Carboxylation efficiency, Biomass allocation, Leaf area ratio, Pigment content, Nitrogen concentration, Phosphorus concentration,

摘 要 ：朱砂根和山血丹是重要的药用植物和观果花卉。在不同磷营养水平下栽培朱砂根和山血丹,测定其光合作用、形态、生物量分配及各器官氮和磷浓度等指标。结果表明:随磷营养水平的增加,两种植物在饱和光下的净光合速率(A)和叶面积比(LAR)升高,各器官的氮(N)浓度和磷(P)浓度均有所增加,其中朱砂根对繁殖器官的投入也增加,表明磷营养水平的增加能够促进其生长和繁殖。净光合速率(A)和羧化效率(CE)的显著正相关及羧化效率(CE)与叶片磷浓度的显著正相关表明,磷营养水平的增加可能通过增加两种植物叶片中的磷浓度提高羧化效率从而提高植物的光合能力。在施磷量高于60mg·kg^-1时,磷营养增加对植物的促进作用减弱。本研究对栽培利用这两种资源植物过程中磷的施用提供了一定的科学依据。

Abstract:Ardisia crenata and Ardisia punctata are species of important medicinal and ornamental values.The effects of phosphorus nutrition on the gas exchange,pigment content,biomass allocation,nitrogen and phosphorus concentration of both A.crenata and A.punctata,were studied under four phosphorus nutrition levels.With the increased phosphorus supply,the net photosynthetic rate at saturated light (A),leaf area ratio (LAR),and the concentration of nitrogen and phosphorus increased in both species,and the biomass allocation of A.crenata to propagule also increased.So it was indicated that the increased phosphorus supply could facilitate the growth and reproduction of these two species.There was significant positive correlation between net photosynthetic rate and carboxylation efficiency as well as between carboxylation efficiency and phosphorus concentration in leaf,so it indicated that the enhanced photosynthetic capacity was probably correlated with the carboxylation efficiency.The positive effects of phosphorus faded when the phosphorus supply was more than 60 mg·kg^-1.The results could provide some useful information for the phosphorus supply in the culture of these two species.

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