北京林业大学学报2015，Vol.37Issue(10)：67-72,6.DOI:10.13332/j.1000-1522.20150007
不同光照条件下东北红豆杉幼苗光合特性日变化
Diurnal changes of photosynthetic characteristics of Taxus cuspidata seedlings under different light conditions.
摘要
Abstract
In order to understand the characteristics of light adaptation of Taxus cuspidata for efficient cultivation , we selected 5-year-old seedlings to study the diurnal changes of photosynthetic characteristics under three different light conditions, i. e. , full light (FL), 60% FL (F1) and 30% FL (F2), and measured the physiological responses of the seedlings to the change of light and temperature. The results showed that the photosynthetic rate ( Pn ) of all three groups had a double-peaked curve, and Pn of seedlings at 9:00 am was significantly higher than that at 15:00 pm. Pn under F2 light condition was the highest, and the Pn value under the F1 light condition was higher than that under the full light condition. It was clear that Pn of seedlings was restrained by the increase of light intensity. The diurnal changes of stomatal conductance (Gs) and the transpiration rate (Tr) showed a similar double-peaked pattern of the Pn values. The variations of Gs values of the seedlings under F2 light condition was lower than the other two groups;the Tr under F2 light condition reached the highest value in the morning, and the Tr under FL condition was the highest in the afternoon. The intercellular carbon dioxide concentration ( Ci ) showed a "V" curve trend. The Ci of seedlings under F2 had the highest value in the morning, and the Ci reached the opposite trend in the afternoon, significantly different from the FL trend. The trend of the diurnal variation of stomatal limitation ( Ls ) was opposite to that of Ci completely. In general, the net photosynthetic rate of the seedlings decreased with the increase of light intensity during the daytime obviously.关键词
东北红豆杉/光照条件/光合特性/日变化Key words
Taxus cuspidata/light conditions/photosynthetic characteristics/diurnal changes分类
农业科技引用本文复制引用
刘彤,金慧颖,徐浩玉,周志强,张玉红..不同光照条件下东北红豆杉幼苗光合特性日变化[J].北京林业大学学报,2015,37(10):67-72,6.基金项目
黑龙江省自然科学基金项目(C201344)、国家林业局珍稀濒危物种野外救护与繁育管理项目. （C201344）
