干旱胁迫对真桦根系形态及生物量分配的影响  

Effects of Drought Stress on Root Morphology & Biomass Allocation of Betula maximowicziana

作　　者：王晓冬[1] 曹立萍[1] 刘延迪[1] 

机构地区：[1]黑龙江省森林植物园,黑龙江哈尔滨150040

出　　处：《防护林科技》2011年第5期20-22,50,共4页Protection Forest Science and Technology

摘　　要：通过人工控水土培方法,研究了干旱胁迫对真桦的根系形态、分级特征、苗高生长以及生物量分配的影响。结果表明,干旱胁迫显著影响真桦根系形态及构型,随着土壤含水量的降低,真桦根系质量和平均直径降低。轻度和中度干旱使真桦根系总长度、根系表面积、比根长降低;重度干旱下,直径小于0.5 mm的细根比例显著提高,根系总长度、根系表面积、比根长显著提高。随着土壤含水量的降低,真桦苗木的高生长受到抑制,生物量降低,根冠比明显提高。Effect of drought stress on root morphology,diameter scale of root system,height growth biomass allocation of Betula maximowicziana by four artificially controlled moisture gradients were studied.Result shows that root system morphology construction of Betula maximowicziana were influenced markedly by soil moisture stress.Biomass average diameter of root system in Betula maximowicziana decreased with the reduction of soil moisture.Light moderate stress reduced the total root length,root surface area special root length,while they were raised in heavy stress conditions by increasing the number of fine roots（root diameter below 0.5 mm）.Drought stress reduced the seedling height biomass of Betula maximowicziana,but significantly raised its root-shoot ratio.

关 键 词：干旱胁迫 真桦 根系形态 生物量 

分 类 号：S792.159[农业科学—林木遗传育种]