森林工程2026，Vol.42Issue(5)：908-917,10.DOI:10.7525/j.issn.1006-8023.2026.05.003
两种林型兴安落叶松及林下植被吸收根形态和生物量特征分析
Absorptive Root Morphology and Biomass Characteristics of Larix gmelinii and Understory Vegetation in Two Forest Types
摘要
Abstract
To reveal the variation characteristics of absorptive root morphology,biomass and root length density of plants with different life forms in two typical Larix gmelinii forest types,this study selected Carex-L.gmelinii forest and grass-L.gmelinii forest in Hongwei Forest Farm,Huzhong District of the Greater Khingan Mountains.The soil core method was adopted to determine the absorptive root morphology,biomass and root length density of L.gmelinii,understory shrubs and herbs in the organic layer and mineral soil layer,and the relationships between root characteristics of L.gmelinii and soil factors were further analyzed.The results showed that soil layer,forest type and life form all signifi-cantly affected absorptive root characteristics(P<0.05).In the two forest types,the absorptive root diameter of plants with three life forms in the organic layer was significantly lower than that in the mineral soil layer,while the specific root length showed an opposite trend.Between different forest types,the absorptive root morphology of three life forms dif-fered significantly in the organic layer.In Carex-L.gmelinii forest,the specific root length of L.gmelinii was remarkably higher than that in grass-L.gmelinii forest,whereas the root tissue density was significantly lower than those in the grass-L.gmelinii forest.For understory vegetation,the absorptive root diameter of shrubs in grass-L.gmelinii forest was nota-bly greater than that in Carex-L.gmelinii forest.In terms of root biomass and root length density,for all life forms in both forest types,the organic layer was significantly higher than the mineral soil layer,and the grass-L.gmelinii forest was sig-nificantly higher than the Carex-L.gmelinii forest.For biomass and root length density proportions,shrubs had the high-est absorptive root biomass in both forest types.Correlation analysis indicated that the effects of soil factors on L.gmelinii absorptive roots differed between soil layers.Soil water content and total phosphorus were the main influencing factors in the organic layer,whereas total carbon,total nitrogen,carbon-to-nitrogen ratio,and total phosphorus were the key factors in the mineral soil layer.In conclusion,the characteristics of absorptive roots of L.gmelinii,understory herbs,and shrubs varies among forest types and soil layers,and soil factors exert differential effects on the absorptive root traits of L.gmeli-nii,which sheds light on the mechanistic understanding in species coexistence and diversity maintenance in this region.关键词
林型/兴安落叶松/林下植被/吸收根/根形态/根生物量/根长密度Key words
Forest type/Larix gmelinii/understory vegetation/absorptive root/root morphology/root biomass/root length density分类
农业科技引用本文复制引用
樊希文,陈廷廷,路彩云,李少杰,王海燕,薛娟,谷加存..两种林型兴安落叶松及林下植被吸收根形态和生物量特征分析[J].森林工程,2026,42(5):908-917,10.基金项目
国家自然科学基金面上项目(32371858). （32371858）
