干旱胁迫对科尔沁沙地3种乔木光响应特性的影响  

Effects of Drought Stress on Light Response Characteristics of Three Kinds of Tree Species in Horqin Sandy Land

作　　者：迟琳琳[1] 

机构地区：[1]辽宁省固沙造林研究所,辽宁阜新123000

出　　处：《防护林科技》2017年第7期8-10,共3页Protection Forest Science and Technology

基　　金：辽宁省农业领域青年科技创新人才培养计划项目(2014012)

摘　　要：以科尔沁沙地糖槭、元宝枫和桃叶卫矛为材料,研究轻度、中度和重度干旱胁迫下3种乔木的光响应特性,结果表明:3种乔木的光响应曲线均随着干旱胁迫的加剧呈下降趋势,干旱胁迫对糖槭的光能利用率影响最大,对桃叶卫矛的影响最小;随着干旱胁迫程度的加剧,3种乔木的最大净光合速率、光饱和点、表观量子效率、暗呼吸速率逐渐降低,元宝枫和桃叶卫矛的光补偿点呈先增后降趋势;在干旱胁迫后期,桃叶卫矛和元宝枫对光环境具有更好的适应性,更适合在半干旱沙地进行造林。The light response characteristics of three kinds of trees under mild？ moderate and severe drought stress were studied by using Acer saccharum , Acer truncatum Euonymus maackii as the materials in Horqin sandy land. Result shows that the light response curves of the three trees decrease with the increase of the drought stress; the effect of drought stress on the utilization of light energy of Acer saccharum is the highest; the effect on drought resistance is the least. With the increase of drought stress, the maximum net photosynthetic rate, light saturation point, apparent quantum respiration rate and dark respiration rate gradually decreased;the light compensation point of Acer truncatum Phyllostachys spicatum increase first and then decrease. At the later stage of drought stress, Euonymus maackii Acer truncatum ？which are optimal adaptable to light environment, are suitable for afforesta-tion in sandland.

关 键 词：干旱胁迫 乔木 光响应曲线 科尔沁沙地 

分 类 号：O43[机械工程—光学工程]