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.
万方数据
维普
