宜昌大老岭表土孢粉组合与植被及环境因子的关系分析  

Relationship analysis between topsoil pollen assemblages and vegetation and environmental factors in Dalaoling,Yichang

作　　者：王秀梅 程波[1,2] 万金红[3] WANG Xiumei;CHENG Bo;WAN Jinhong(Hubei Province Laboratory for Geographical Process Analyzing&Modeling,Central China Normal University,Wuhan 430079,China;College of Urban and Environmental Sciences,Central China Normal University,Wuhan 430079,China;Water History Department of China Institute of Water Resources and Hydropower Research,Beijing 100048,China)

机构地区：[1]华中师范大学地理过程分析与模拟湖北省重点实验室,武汉430079 [2]华中师范大学城市与环境科学学院,武汉430079 [3]中国水利水电科学研究院水利史研究所,北京100048

出　　处：《华中师范大学学报（自然科学版）》2023年第3期412-422,共11页Journal of Central China Normal University：Natural Sciences

基　　金：国家自然科学基金项目(41771261).

摘　　要：通过对宜昌大老岭自然保护区不同海拔的16个表土样品孢粉分析,结合植被调查研究该地现代表土孢粉组合与植被的关系.结果表明,大老岭常绿与落叶阔叶混交林、针阔叶混交林孢粉组合中,针叶乔木的松属呈超代表性,铁杉呈适中的代表性;落叶阔叶乔木以栎属为优势成分,具高代表性,蔷薇科、桦木属、鹅耳枥属、胡桃属、水青冈属具有适中的代表性;青冈属代表性适中,杜鹃花科、忍冬科呈现低代表性,草本禾本科、菊科蒿属在山区的代表性差异明显;蕨类普遍具有超代表性,孢粉组合基本反映了现生亚热带北缘山区针阔叶混交林的主要植被特征.受花粉自身特点、小生境与人类活动的影响,花粉组合与植被类型存在一定的偏差.主成分分析(PCA)结果表明,影响大老岭孢粉科属变化的主要环境因子是温度.表土花粉E/D值(常绿阔叶乔木/落叶阔叶乔木)随着海拔的升高而降低,反映了山地植被中常绿阔叶乔木减少、落叶阔叶乔木增多的变化趋势.The relationship between modern topsoil pollen assemblages and vegetation was investigated by analysing pollen samples at different elevations in Yichang Dalaoling Nature Reserve in combination with vegetation surveys.The results showed that among the pollen assemblages of evergreen and deciduous broad-leaved mixed forest and coniferous broad-leaved mixed forest in Dalaoling,the coniferous trees pollen of Pinus was over-representative and Tsuga was moderately representative.The deciduous broad-leaved tree pollen was dominated by Quercus with high representation,Rosaceae,Betula,Carpinus,Juglans and Fagus with moderate representation.The evergreen broad-leaved tree pollen of Cyclobalanopsis was moderately representative,Ericaceae and Caprifoliaceae showed low representation.The herbaceous Gramineae and Artemisia differ significantly in their representation in the mountains.Ferns were generally over-representative.The pollen assemblages generally reflected the main vegetation characteristics of the mixed coniferous and broad-leaved forests in the mountains of the northern edge of the present subtropics.Pollen assemblages deviated somewhat from vegetation types due to pollen's own characteristics,microhabitats and human activities.The results of principal component analysis(PCA)indicated that the main environmental factor influencing the variation of pollen taxa in Dalaoling was temperature.The E/D value of topsoil pollen(evergreen broad-leaved trees/deciduous broad-leaved trees)decreased with increasing altitude,reflecting the trend of decreasing evergreen broad-leaved trees and increasing deciduous broad-leaved trees in montane vegetation.

关 键 词：针阔叶混交林 表土孢粉组合 PCA E/D值 宜昌大老岭 

分 类 号：Q944.571[生物学—植物学]