干旱程度对落叶松生长和生理特性的影响研究  

Effects of Drought Degree on Growth and Physiological Characteristics of Larix gmelinii

作　　者：高宗渊 Gao Zongyuan(Guamagou State-Owned Forest Farm,Liupanshan Forestry Bureau,Guyuan City,Ningxia Hui Autonomous Region,Guyuan,Ningxia 756500,China)

机构地区：[1]宁夏回族自治区固原市六盘山林业局挂马沟国有林场,宁夏固原756500

出　　处：《绿色科技》2023年第3期169-172,共4页Journal of Green Science and Technology

摘　　要：为研究干旱程度对落叶松幼苗生长和生理特性的影响,以正常水分为对照(CK):土壤田间持水量为70%~75%;设置3个干旱处理,分别为轻度干旱:田间持水率55%~60%(LD);中度干旱:田间持水率45%~50%(MD);重度干旱:田间持水率35%~40%(SD),研究了落叶松生长、光合参数、渗透调节物质和抗氧化酶活性的变化特征。结果表明:随着干旱程度的增加,落叶松幼苗株高、地径、净光合速率、气孔导度和蒸腾速率呈逐渐减小的趋势,在轻度干旱下影响较小。SOD、POD、CAT活性和可溶性糖、可溶性蛋白含量随含水量的降低先升高后降低。说明在干旱胁迫下植物通过提高渗透调节物质含量和抗氧化酶活性以抵抗伤害,当伤害程度超过植物承受范围时调节能力下降。因此落叶松幼苗可以在轻度干旱下正常生长,随着干旱程度的加重,对落叶松幼苗的伤害增加。In order to study the effects of drought on the growth and photosynthetic characteristics of Larix gmelinii seedlings,normal water(CK)was used as control.The field water capacity of soil was 70%-75%;Three drought treatments were set.Field water holding rate was 55%~60%(LD)in mild drought;field water holding rate was 45%~50%(MD)in moderate drought;field water holding rate was 35%~40%(SD)in severe drought.The change characteristics of growth,photosynthetic parameters,osmoregulation substances and antioxidant enzyme activities of Larix gmelinii were studied.The results showed that with the increase of drought degree,the height,ground diameter,net photosynthetic rate,stomatal conductance and transpiration rate of Larix gmelinii seedlings decreased gradually,and the effect was small under light drought.The contents of SOD,POD,CAT,soluble sugar and soluble protein increased first and then decreased with the decrease of water content.It shows that under drought stress,plants can resist injury by increasing the content of osmoregulation substances and the activity of antioxidant enzymes.When the extent of injury exceeds the tolerance range of plants,the regulatory capacity decreases.Therefore,Larix gmelinii seedlings can grow normally under mild drought,and the damage to Larix gmelinii seedlings can increase with the aggravation of drought.

关 键 词：落叶松 干旱 生长 生理 

分 类 号：S791.22[农业科学—林木遗传育种]