西南林业大学学报2016，Vol.36Issue(3)：12-17,6.DOI:10.11929/j.issn.2095-1914.2016.03.003
土壤持续干旱对白杨幼苗光合生理的影响
Effects of Soil Drought on P hotosynthetic P hysiology of Populus tremuloides Seedlings
摘要
Abstract
In this experiment, 3-4-month-old Populus tremuloides seedlings were used as materials for con-trolled water test by soil progressive drought method, and then the leaf relative water content ( RWC) , stem xylem water potential (ψxp ) , fluorescence parameters, gas exchange and leaf area index were measured to comprehensive evaluation of drought resistance of poplar seedlings. The results showed that leaf RWC,ψxp , stomatal conductance (gs) and net photosynthetic rate (Pn) were decreased significantly at the early stage of drought. To stage 2, these parameters almost dropped to their valleys, and they had no obvious variation even implemented continue drought. After all leaves were dead and remained one month no watering, and then re-watered, new leaves grow from the old leaf position. Leaf RWC andψxp of new leaves returned to the control level, but Pn and gs had no obvious increase. Under severe drought stress damage, Pn and gs reduced significantly, and photosynthetic system repair was relatively slow, and even some was irreversible damage. The photochemical quantum yield (Fv/Fm) was more sta-ble, and less affected by drought stress.关键词
白杨/土壤干旱/光合生理/复水Key words
Populus tremuloides/soil drought/photosynthetic physiology/re-watered分类
农业科技引用本文复制引用
陆燕元,刘蔚漪..土壤持续干旱对白杨幼苗光合生理的影响[J].西南林业大学学报,2016,36(3):12-17,6.基金项目
西南林业大学云南省省级重点学科(林学)资助；国家自然科学基金地区基金项目(31460181)资助；西南地区生物多样性保育国家林业局重点实验室开放基金资助。 （林学）
