生态学报2025，Vol.45Issue(6)：2821-2837,17.DOI:10.20103/j.stxb.202406181406
海岛马尾松林芒萁和生境对植物多样性和乔木更新多样性的影响
Effects of Dicranopteris pedata in the understory of Pinus massoniana and habitat on plant diversity and tree regeneration diversity in islands
摘要
Abstract
The Pinus massoniana forest represents the most extensive type of evergreen needleleaf forest vegetation on the islands of Fujian Province.The diversity of plant species and the regeneration of trees in these forests played a decisive role in determining the path of community succession.Dicranopteris pedata,a prevalent understory species in Pinus massoniana forests,exhibits both beneficial ecological functions and characteristics of invasive plants.Exploring its potential impacts on Pinus massoniana forests not only aids in devising effective strategies for plant community conservation but also enhances our understanding of the parallels and differences between native species with invasive characteristics and non-native invaders.This study conducted quadrat surveys about the communities where Dicranopteris pedata and Pinus massoniana coexist on six islands within Sandu Gulf,Fujian Province.We calculated the α and β diversities of herbs,shrubs,trees,and tree seedlings,and decomposed the β diversity into the components of species abundance differences and species turnover.Through regression analysis,we investigated the relationship between the importance value of Dicranopteris pedata and the α diversity of all layers.Furthermore,we used redundancy analysis(RDA)and multiple regression on dissimilarity matrices(MRM)to identify the factors that have significant effects on the α and β diversities across all layers.Finally,path analysis was used to infer the direct and indirect effects of Dicranopteris pedata and environmental factors on plant diversity,as well as their relative significance.The results indicated that:(1)Dicranopteris pedata influenced the α diversity of the grass,shrub layer,and tree seedlings,with explanation rates ranging from 0.45 to 0.90,0.49 to 0.61,and 0.19 to 0.48,respectively.Interestingly,its impact on the Pielou index of tree seedlings differed from that on other layers,showing a positive correlation trend.(2)The decomposition of β diversity revealed that the species turnover dominanted in all layers of the surveyed plots,accounting for over 70%of the total β diversity.Dicranopteris pedata significantly affected the total β diversity of the grass layer,shrub layer,and tree seedlings,with MRM regression coefficients of 0.089,0.034,and 0.051,respectively.It also affected the species turnover of the tree,shrub,and grass layers and the species abundance difference of tree seedlings.(3)The results of the redundancy analysis(RDA)showed that soil pH,distance from the mainland,and the importance value of Dicranopteris pedata jointly affected α diversity,and the total explanation of the first and second axes was 33.03%.The results of the MRM analysis showed that soil factors,canopy closure,geographic distance between plots,and the importance value of Dicranopteris pedata jointly affected β diversity.(4)Correlation and path analyses suggested that soil pH indirectly affected the α and β diversity of the community by fostering an environment conducive to the growth of Dicranopteris pedata.The direct impact of Dicranopteris pedata on diversity was generally greater than that of soil pH,yet soil pH serves as a prerequisite.The direct influence of geographical distance on β diversity was comparable to the importance value of Dicranopteris pedata,with path coefficients exceeding 0.30,and it can indirectly affect β diversity by influencing environmental factors.In conclusion,Dicranopteris pedata significantly affected the α and β diversity of the shrub and grass layers,along with tree seedlings.Environmental factors such as soil pH served as important prerequisites for the influence of Dicranopteris pedata on community diversity.Analogous to invasive plants,the influence of Dicranopteris pedata onα diversity also showed a unimodal trend and had an impact on tree regeneration.关键词
三都澳/马尾松半自然林/α多样性/β多样性/层片/乔木幼苗Key words
Sandu Gulf/semi-natural Pinus massoniana forests/α diversity/β diversity/synusia/tree seedlings引用本文复制引用
王迎雪,肖集泓,邓清雅,朱琦琦,王彬彬,林曼妮,罗真,陈颖,邓传远..海岛马尾松林芒萁和生境对植物多样性和乔木更新多样性的影响[J].生态学报,2025,45(6):2821-2837,17.基金项目
海洋公益性行业科研专项经费项目(201505009) （201505009）
福建省区域发展科技项目计划(2018Y3006) （2018Y3006）
福建农林大学科技创新专项基金项目(CXZX2019086) （CXZX2019086）
