不同生长条件下多伞阿魏光合生理特性研究  

A Study on Photosynthetic Physiological Characteristics of Ferula Ferulaeoides in Different Growth Conditions

作　　者：李小波[1] 庄丽[1] 王仲科[1] 付勇[1] 

机构地区：[1]石河子大学生命科学学院,新疆石河子832000

出　　处：《河南科学》2011年第11期1316-1321,共6页Henan Science

基　　金：国家自然基金项目资助(110140101)

摘　　要：运用LCPro+全自动便携式光合测定系统,比较研究了原生地和引种地两种生长条件下多伞阿魏(Ferulaferulaeoides)的净光合速率(Pn)、蒸腾速率(Tr)、水分利用率(WUE)、气孔导度(Gs)、胞间二氧化碳(Ci)、气孔限制值(Ls)等光合指标.结果表明:原生地多伞阿魏的净光合速率低于生长在较好环境条件下的引种多伞阿魏,日平均值分别为13.84μmol(/m.2s)和15.01μmol(/m.2s),两者在14:00时出现"光合午休"现象,结合两地多伞阿魏Ci和Ls的变化比较,得出两者光合速率降低的原因是气孔限制因素引起.原生地多伞阿魏的蒸腾速率也低于引种地的多伞阿魏,日平均值分别为3.72 mmol(/m.2s)和4.39 mmol(/m.2s).而原生地多伞阿魏的水分利用率却高于引种地,日平均值分别为3.89μmol/mmol和3.73μmol/mmol.这表明引种地多伞阿魏的光合能力高于原生地,而原生地的多伞阿魏则通过降低气孔导度来减小蒸腾作用,提高水分利用率来更好适应当地的干旱环境.The net photosynthetic rates（Pn）,transpiration rates（Tr）,water use efficiencies（WUE）,intercellular CO2 concentration（Ci） and stomatal limited value（Ls） of Ferula ferulaeoides of original and introducing regions with LCPro＋ portable photosynthetic system were studied.It was shown that the net photosynthetic rate of Ferula ferulaeoides of original regions was significantly lower than that of introducing regions,with daily mean values of 13.84 and 15.01 μmol/（m2·s）,respectively and both of them showing double peaks with the phenomenon of＂midday rest＂ at 14：00.The decrease of net photosynthetic rates may be caused by stomatal limitation by comparing Ci and Ls of Ferula ferulaeoides.The transpiration rate of Ferula ferulaeoides of original regions was also lower than that of introducing regions with daily mean values of 3.72 and 4.39 mmol/（m2·s）,respectively.The water use efficiency of Ferula ferulaeoides of original regions was higher than that of introducing regions,with daily mean values of 3.89 and 3.73 μmol/mmol,respectively.The results indicate that the photosynthetic capacity of Ferula ferulaeoides of introducing regions was stronger than that of original regions,but the Ferula ferulaeoides of original regions could be more suitable for drought environment by decreasing stomatal conductance in order to reduce transpiration rates and increasing water use efficiencies in clear day.

关 键 词：多伞阿魏 光合速率 蒸腾速率 日变化 

分 类 号：Q948.12[生物学—植物学]