干旱胁迫下不同胸径胡杨生理特点分析  

Analysis on the Physiological Characteristic of Populus euphratica with Different DBH under Drought Stress

作　　者：袁月[1,2] 吕光辉[1,2,3] 徐敏[1,2] 王恩众 

机构地区：[1]新疆大学资源环境科学学院,乌鲁木齐830046 [2]新疆绿洲生态重点实验室,乌鲁木齐830046 [3]新疆大学干旱生态环境研究所,乌鲁木齐830046 [4]徐州矿物集团旗山煤矿通风工区,徐州221000

出　　处：《新疆农业科学》2009年第2期299-305,共7页Xinjiang Agricultural Sciences

基　　金：新疆维吾尔自治区高校科研计划重点项目"基于AMSR-E和MODLS数据的新疆土壤湿度研究"(XJEDU2005106)

摘　　要：以三个典型样地中不同胸径胡杨下部披针形叶片为实验材料，对其光合色素含量、水分含量、可溶性糖含量、脯氨酸含量、可溶性蛋白含量进行了测定。结果表明：随着水分胁迫的加剧，不同胸径胡杨类胡萝卜素、胡萝卜素／叶绿素、可溶性糖、可溶性蛋白含量均呈上升的趋势。而叶绿素b、脯氨酸含量在不同土壤水分条件下变化不同，表现为轻度胁迫时含量增加，重度胁迫时含量急剧减少。不同胸径间胡杨的各项生理指标大致表现为随着胸径的增大含量逐渐升高的趋势。研究表明：在一定的水分胁迫下。胡杨可以通过生理过程不断调整自身的抗旱能力。但当胁迫加重时，胡杨的生理活动便遭到一定程度的破坏。在5～30cm，胸径越大的胡杨,忍受胁迫的能力越强。In order to study drought tolerance of Populus euphratica with different dbh, the contents of leaf chlorophyll, water, soluble sugar, the contents of proline,protein of lower leaves of Populus euphratica of typical communities were researched. The results showed that the contents of carotenoid （Car）, carotenoid/chlorophyll,soluble sugar and protein of Populus euphratica with aggravating of different dbh increased when they suffers drought stress. But with aggravating of different drought stress, the contents of chlorophyll b and praline of Populus euphratica with different dbh were decreased, when they suffer a slight drought stress, the contents increased, but when they suffer a severe drought stress, the contents deceased sharply. Every kind of physiological index of Populus euphratica increased with dbh being greater. The conclusion was drawn as follows： under a certain water stress Populus euphratica continually could adjust its drought tolerance, under a certain water stress physiological activity of Populus euphratica will be destroyed. And the greater the dbh of Populus euphratica is, the stronger its drought tolerance will be.

关 键 词：典型群落 胸径 胡杨 生理指标 

分 类 号：S792.119[农业科学—林木遗传育种]