广东山丘地区5个血防林造林树种幼苗抗旱性综合评价  

Comprehensive Evaluation on Drought Resistance of Seedlings of Five Tree Species for Schistosomiasis Control Forest in Hilly Area of Guangdong Province

作　　者：黄文养 Huang Wenyang(Shaoguan City Qujiang District Forestry Ecological Protection Center,Shaoguan 512133,China)

机构地区：[1]韶关市曲江区林业生态保护中心,广东韶关512133

出　　处：《防护林科技》2023年第6期12-15,26,共5页Protection Forest Science and Technology

摘　　要：以樟树、香椿、巨桉、银杏、木荷5个优良的广东山丘地区血防林树种为研究对象,在人工控制环境条件下,通过PEG 4000模拟干旱胁迫的方法,探究了0%~25%PEG处理下,幼苗生长生理的变化。结果表明:在12%~25%PEG处理下,供试树种幼苗均遭受到了不同程度的胁迫伤害,幼苗存活率、苗高增量、地径增量减小,叶片相对水分亏缺率增大,且PEG浓度越高,胁迫伤害越严重。而可溶性糖、可溶性蛋白、游离脯氨酸含量及SOD、POD、CAT活性,随着PEG浓度增加呈先上升后下降的趋势,在12%PEG处理下达最大值。任一浓度PEG处理下,树种间幼苗生长生理变化差异显著,但变化趋势复杂,无明显规律。经主成分分析法综合评价,12%PEG处理下供试5个树种抗旱性表现为:巨桉>木荷>樟树>银杏>香椿。树种不同,对干旱胁迫的生长生理响应也不同,其中以巨桉抗旱潜力最大,而香椿最小。Five excellent tree species for Schistosomiasis control forest in hilly areas of Guangdong Province,such as Cinnamomum camphora,Toona sinensis,Eucalyptus grandis,Ginkgo biloba and Schima superba,were taken as the research objects.Under the condition of artificial control environment,the growth and physiological changes of seedlings under 0%-25%PEG treatment were explored by PEG 4000 simulated drought stress.The results showed as follows:under 12%-25%PEG treatment,the seedlings of the tested tree species suffered different degrees of stress damage,the seedling survival rate,seedling height increment and ground diameter increment decreased,and the relative water deficit rate of leaves increased,and the higher the PEG concentration was,the more serious the stress damage became;the content of soluble sugar,soluble protein,free proline and the activity of SOD,POD and CAT increased first and then decreased with the increase of PEG concentration,and reached the maximum value under 12%PEG treatment;under any concentration of PEG treatment,the growth and physiological changes of seedling among tree species were significantly different,but the change trend was complex and had no obvious regularity.By the valuation of principal component analysis,the drought resistance of five tested tree species under 12%PEG treatment was as follows:E.grandis>S.superba>C.camphora>G.biloba>T.sinensis.Different tree species have different growth and physiological responses to drought stress.Among them,E.grandis has the greatest drought resistance potential,while T.sinensis has the smallest.

关 键 词：干旱胁迫 血吸虫病 适地适树 定向培育 

分 类 号：S727.28[农业科学—林木遗传育种]