[1]佚名 佚名 佚名.三才期刊采编系统文章正在整理中…[J].江苏农业学报,2005,(01):5-9.
　XIE Xin,ZHAO Zhong.三才期刊采编系统文章正在整理中…[J].,2005,(01):5-9.
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三才期刊采编系统文章正在整理中…
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江苏农业学报[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2005年01期
页码:
5-9
栏目:
出版日期:
2005-02-25

文章信息/Info

Title:
三才期刊采编系统文章正在整理中…
作者:
佚名 佚名 佚名
西北农林科技大学 林学院，陕西杨陵712100
Author(s):
XIE Xin;  ZHAO Zhong
College of Forestry, Northwest A＆F University, Yangling, Shaanxi 712100
关键词:
干旱胁迫; 刺槐; 光合日变化
Keywords:
Drought stress;  Robinia pseudoacacia;  diurnal photosynthetic variation
分类号:
S792.260.4
文献标志码:
A
摘要:
采用盆栽试验在正常水分、中度干旱和重度干旱（田间持水量的75%、50%和35%）3种土壤水分条件下，研究了1年生刺槐幼苗的光合日变化特性。结果表明：在不同土壤水分条件下，刺槐叶片同一光合生理参数（净光合速率Pn、气孔导度Gs、蒸腾速率Tr、气孔限制值Ls、羧化效率CE、胞间CO2浓度Ci、、和水分利用效率WUE）的日变化动态趋势近似一致。Pn日变化呈现双峰曲线的形式，在中午出现明显的午休现象。在全天的七个测定时间点，刺槐叶片的Pn、Gs、Tr、Ls、CE均表现出：正常水分>中度干旱>重度干旱；Ci则表现为：重度干旱>中度干旱>正常水分；而WUE在全天不同时段表现不同，显示刺槐可通过生理调节机制适应外界环境变化，维持高效的水分利用效率。随土壤水分降低，刺槐叶片Pn的降低在8：00-10：00是由非气孔限制引起；而10：00-12：00则由气孔限制引起。
Abstract:
The diurnal photosynthetic variation of potted oneyearold seedlings of Robinia pseudoacacia was studied under three soil moisture conditions which were suitable soil moisture, medium drought and severe drought(75%, 50% and 35% of saturated soil moisture content). The results showed that the diurnal change of a certain photosynthetic physiological parameter (e.g. net photosynthetic rate (Pn), stomatal conductance(Gs), transpiration rate(Tr), stomatal limitation value(Ls), carboxylation efficiency(CE), intercellular CO2 concentration(Ci) or use efficiency(WUE)) was of similar trend under different soil moisture conditions. The diurnal variation of Pn presented a hyperbolic curve and a clear nap phenomenon at noon. Of the seven test time points in a full day, the Pn, Gs,Tr,Ls and CE all showed a trend as normal soil moisture> moderate drought stress> severe drought stress, but the Ci showed a tendency: severe drought stress > moderate drought stress> normal soil moisture. The WUE showed differences in different time interval of a day, indicating Robinia pseudoacacia could adapt itself to the changes of external environment to maintain efficient WUE by physical adjustment mechanism. With soil moisture reduction, the Pn declined by nonstomatal control from 8:00 to 10:00 and by stomatal control from 10:00 to 12:00.

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更新日期/Last Update: 2005-02-25