干旱胁迫对5种园林乔木幼苗根系形态的影响  

Effects of Drought Stress on Root Morphological in Seedlings of Five Species of Garden Plants

作　　者：陈晓熹 张炎晶 赖灿 伍佳 谭灿灿 郭微[3] 战国强 孙延军 CHEN Xiao-xi;ZHANG Yan-jing;LAI Can;WU Jia;TAN Can-can;GUO Wei;ZHAN Guo-qiang;SUN Yan-jun(Guangdong Ecological Engineering Vocational College,Guangzhou 510520,Guangdong China;Shenzhen Kunyuan Ecological Technology Co.,Ltd.,Shenzhen 518000,Guangdong China;Zhongkai University of Agriculture and Engineering,Guangzhou 510225,Guangdong China)

机构地区：[1]广东生态工程职业学院,广东广州510520 [2]深圳坤元生态科技有限公司,广东深圳518000 [3]仲恺农业工程学院,广东广州510225

出　　处：《亚热带植物科学》2024年第6期520-526,共7页Subtropical Plant Science

基　　金：广东省林业科技创新项目“珠三角森林城市群质量提升关键技术研究”(2021KJCX009);广东省普通高校创新团队项目(2024KCXTD078)。

摘　　要：为探究干旱胁迫对城市树木根系形态的影响,以二年生凤凰木Delonix regia、火焰木Spathodea campanulata、樟Camphoraofficinarum、小叶榄仁Terminalianeotaliala和美丽异木棉Ceibaspeciosa幼苗为研究对象,比较不同干旱胁迫强度下根系形态变化。结果表明,随干旱胁迫强度增加,CK相比中、重度干旱处理下的樟总根长、平均连接长度显著减小,分支密度显著增大(P<0.05);小叶榄仁平均连接长度显著减小,分支密度显著增大。干旱胁迫下大部分根系构型指标间呈极显著相关性(P<0.01)。特别是在重度干旱处理下,总根长与分支数的相关性更加紧密,表明在极端胁迫条件下,植物的生长策略和资源分配模式可能发生显著变化,从而影响根系特征间的相互关系。通过主成分分析和最大方差轮换法,筛选出对干旱胁迫敏感的树木根系形态指标为分支数、总根长和交叉数,5种乔木根系形态综合得分排序为小叶榄仁>凤凰木>樟>火焰木>美丽异木棉。This study investigated the effects of drought stress on the root morphological of urban trees.Two-years-old seedlings of Delonix regia,Spathodea campanulata,Camphora officinarum,Terminalia neotaliala and Ceiba speciosa were used as research subjects.And the changes in root morphology were compared across the different levels of drought stress.The results showed that with the increase of drought stress intensity,the total root length and average connection length of C.officinarum under CK treatment were significantly reduced compared to M and S treatment,and the branch density was significantly increased(P<0.05);The average connection length of T.neotaliala significantly decreased,and the branch density significantly increased.Under drought stress,most root architecture indicators showed a highly significant correlation(P<0.01).As drought stress increased,the correlations among root traits also intensified,particularly under severe drought conditions,where a strong correlation was observed between total root length and the number of root forks.It indicated that under drought stress,tree resource allocation patterns may change significantly,affecting the interrelationships among various root traits.Using principal component analysis(PCA)and maximum variance rotation,the primary structural indicators identified were the number of root forks,total root length,and root crossings.The comprehensive scores of the species in response to drought stress were ranked in descending order as follows:Terminalia neotaliala>Delonix regia>Camphora officinarum>Spathodea campanulata>Ceibaspeciosa.

关 键 词：干旱胁迫 根系形态 园林乔木 

分 类 号：Q945[生物学—植物学]