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首页> 外文期刊>Nordic Journal of Botany >Responses of Nouelia insignis Franch (Asteraceae) and Terminalia franchetii Gagnep. (Combretaceae) seedlings to long‐term water stress
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Responses of Nouelia insignis Franch (Asteraceae) and Terminalia franchetii Gagnep. (Combretaceae) seedlings to long‐term water stress

机译：反应的Nouelia旧址法语(菊科)和榄仁树属franchetii Gagnep。幼苗长期水压力

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摘要

The responses in terms of seedling growth, biomass allocation and photosynthesis of Nouelia insignis Franch. and Terminalia franchetii Gagnep. to long‐term water stress were studied in a greenhouse experiment. Three‐month‐old seedlings were subjected to the following water supplies for about 79 days: 80, 60, 40 and 20% of field water capacity (FC). The results showed that, as water stress was increased, seedling height, leaf number, root length, specific leaf area (SLA), biomass production and stomatal limitation value (Ls) of both seedlings decreased, and water use efficiency (WUE) increased, and biomass allocation, the diurnal gas exchange and Pn‐PAR response curves also altered. Water supply <40% FC was the threshold of drought‐initiated negative effects on these parameters of both seedlings. Most growth and biomass parameters of T. franchetii seedlings were much higher than those of N. insignis seedlings. However, T. franchetii seedlings were more vulnerable to long‐term water stress thanN. insignis seedlings. Simultaneously, N. insignis seedlings had a higher ability to use strong light and a lower ability to use weak light than T. franchetii seedlings. Although water stress had a great impact on their growth, biomass allocation and photosynthesis, both of N. insignis and T. franchetii seedlings displayed considerable water stress resistance, and they tolerated even the most severe water stress (20% FC), and no seedlings died. However, the field conditions were worse; most of them might be hard to get though the long dry season.
机译：反应的幼苗生长、生物量分配和光合作用的Nouelia旧址长期水压力进行了研究温室试验。受到以下水供应吗大约79天:80年,60岁,40 - 20%的领域水(FC)的能力。水压力增加,幼苗高度、叶数,根长、比叶面积(SLA),生物质生产和气孔限制的价值(Ls)苗减少,和水使用效率(有机物)增加,生物量分配,昼夜气体交换和Pn不相上下响应曲线也改变了。FC是干旱的阈值开始对这些参数的负面影响幼苗。t . franchetii远高于幼苗n .旧址的幼苗。franchetii幼苗更容易长期水压力坦。同时,n .旧址幼苗使用强光和更高的能力低能够使用比t . franchetii弱光幼苗。影响它们的生长、生物量分配和光合作用,n .旧址和T。franchetii幼苗表现出相当大的水压力阻力,甚至容忍最严重的水分胁迫(20% FC),也没有幼苗死亡。更糟糕的是;虽然漫长的旱季。

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