生态学杂志2024，Vol.43Issue(11)：3246-3254,9.DOI:10.13292/j.1000-4890.202411.018
毛乌素沙地不同林龄樟子松人工林林下植物多样性和生物量的动态变化
Dynamics of understory plant diversity and biomass of Pinus sylvestris var.mongolica plantations with dif-ferent ages in Mu Us Sandy Land
摘要
Abstract
Understanding the dynamics of understory plant diversity and biomass in plantations is of great signifi-cance for assessing the effectiveness of sandy vegetation restoration and plantation management.We analyzed the characteristics of understory communities in Pinus sylvestris var.mongolica plantations with different stand ages(Ⅰ:≤10 a,Ⅱ:10 a＜age≤15 a,Ⅲ:15 a＜age≤20 a,Ⅳ:age＞20 a)in Mu Us Sandy Land.The impact of stand factors on understory plant communities was analyzed using structural equation modeling path analysis.A total of 57 species from 47 genera and 20 families were recorded,including 3 shrub species.Asteraceae,Gramineae,Leguminosae and Chenopodiaceae dominated herbaceous layer,accounting for 50％of the total herbaceous species.With increasing stand age,the number of families,genera and species of herbaceous layer decreased first and then increased.With increasing stand age,the perennial herbaceous plants increased,the annual and biennial plants de-creased relatively,the xerophytes decreased,and the mesophytes increased.The Shannon diversity index,Simpson dominance index and Margalef richness index of herbaceous layer decreased first and then increased with increasing stand age,and the Pielou evenness index increased with increasing stand age,but there was no significant differ-ence among different stand age classes(P＞0.05).There was a negative relationship between tree layer coverage and shrub layer coverage and biomass,and a positive relationship between tree layer coverage,shrub layer coverage and understory herb layer coverage,aboveground biomass,species richness and Shannon diversity index.There was a negative correlation between aboveground biomass of shrub layer and herb coverage,aboveground biomass,spe-cies richness and Shannon diversity index.In summary,the vegetation restoration model of Pinus sylvestris var.mon-golica plantation in Mu Us Sandy Land is conducive to the restoration of understory herbaceous plants.Trees and shrubs should be rationally allocated in the future restoration of sandy vegetation to improve species diversity and community stability.关键词
樟子松人工林/林下植被/物种多样性/地上生物量/毛乌素沙地Key words
Pinus sylvestris var.mongolica plantation/understory vegetation/species diversity/aboveground bio-mass/Mu Us Sandy Land引用本文复制引用
胡尔查,王铮,李梓豪,杨海峰,李卓凡,王晓江,高润红..毛乌素沙地不同林龄樟子松人工林林下植物多样性和生物量的动态变化[J].生态学杂志,2024,43(11):3246-3254,9.基金项目
内蒙古自治区重点研发和成果转化项目(2022YFHH0106)、内蒙古自自然科学基金重点项目(2020ZD04)和中央财政林业和草原科技推广示范项目(内林草改[2023]18号)资助. （2022YFHH0106）
