生态学杂志2025，Vol.44Issue(3)：736-744,9.DOI:10.13292/j.1000-4890.202503.019
桉树林种植年限对林下植物及其种间关联的影响
Effects of planting ages on understory plants and their interspecific associations in eucalyptus plantations
摘要
Abstract
Understory plants are an important component of biodiversity in forest plantations and play a key role in maintaining ecosystem functions.To understand the impacts of planting age on understory plants,we conducted a comparative analysis of the composition and diversity of understory plants in the first and second generation Eucalyp-tus plantations.The interspecific associations of understory plants were evaluated using variance ratio(VR),X2 test and Spearman rank correlation test.The results showed that:(1)The Sorenson similarity index of species in shrub layer and herb layer was high between the first and second generations.The shared species were mainly pioneer spe-cies and those with strong disturbance resistance.The dominance of species changed obviously.The ranking of importance value of species changed significantly.The dominant species in the shrub and herb layers of the first generation plantation,Litsea glutinosa and Dicranopteris pedata were replaced by Eucalyptus urophylla and Microle-pia speluncae in the second generation plantation.(2)Species richness significantly decreased from the first genera-tion to the second generation plantation,with a significant increase in the species diversity of the herb layer and no significant difference in the shrub layer.(3)The overall species association in the shrub layer shifted from a signifi-cant positive association to a non-significant negative association with increasing planting age,while that in the herb layer remained significantly positive but weakened.The proportion of positively associated species pairs decreased,and there was a tendency towards negative associations.Successively planting Eucalyptus plantation exerted a con-trolling impact on the composition and diversity of understory species,leading to weakened interspecific associa-tions.However,the importance value of certain species,such as Litsea glutinosa,Pteris semipinnata,Microlepia speluncae,and the number of the positively associated species pairs either remained stable or showed a rapid in-crease in the second generation plantation,indicating that they are of great significance for maintaining understory biodiversity.Our results reveal understory species composition and interspecific associations in plantations,which provides a new perspective for understanding the maintenance of understory biodiversity and the enhancement of ecosystem functions of plantations.关键词
种间联结/物种组成/种植年限/桉树人工林/林下植物Key words
interspecific association/species composition/plantation age/Eucalyptus plantation/understory plant引用本文复制引用
吴兴澳,侯满福,刘雨婷,汪洋..桉树林种植年限对林下植物及其种间关联的影响[J].生态学杂志,2025,44(3):736-744,9.基金项目
国家自然科学基金项目(31160132和31960233)资助. （31160132和31960233）
