干旱胁迫对条墩桑生物量分配和光合特性的影响  

Effects of drought stress on the biomass distribution and photosynthetic characteristics of cluster mulberry.

作　　者：闫海霞[1,2] 方路斌 黄大庄[1,2] 

机构地区：[1]河北农业大学林学院,河北保定071001 [2]河北省林木种质资源与森林保护重点实验室,河北保定071001 [3]沙河市委农工委新农村建设办公室,河北沙河054100

出　　处：《应用生态学报》2011年第12期3365-3370,共6页Chinese Journal of Applied Ecology

基　　金：河北省林木种质资源与森林保护重点实验室项目(2009008);河北省自然科学基金项目(2007204041);河北省林业局项目(200806072)资助

摘　　要：以1年生红皮花桑为材料,采用盆栽的方法,研究了不同水分条件下条墩桑幼苗的生物量、荧光参数、净光合速率、气孔导度、蒸腾速率及水分利用效率的变化.结果表明:随着干旱胁迫程度的增加,植株地上部分的生物量和总生物量逐渐降低,但光合产物向根部的分配比例逐渐增大,根冠比逐渐增加;叶片的荧光参数Fo、Fv和Fv/Fm逐渐降低;气孔导度、蒸腾速率、净光合速率和水分利用效率逐渐下降.One-year-old Morus alba seedlings were cultivated in pots containing soil with different water contents to study the biomass,chlorophyll fluorescence parameters,net photosynthesis rate,stomatal conductance,transpiration rate and water use efficiency of the seedlings in response to diverse water stress.The results showed that the aboveground biomass and total biomass decreased with increasing water stress.However,more photosynthetic products were transferred to the roots in relation to the aboveground parts to make the root-shoot ratio increase.The fluorescence parameters,such as Fo,Fv and Fv/Fm,and stomatal conductance,transpiration rate and water use efficiency decreased with increasing water stress.

关 键 词：条墩桑 干旱胁迫 生物量分配 光合特性 

分 类 号：S888.2[农业科学—特种经济动物饲养]