重庆中梁山岩溶槽谷区表土孢粉与现代植被的关系研究

Relationship between surface soil pollen and modern vegetation in karsttrough area of Zhongliang mountain, Chongqing City, SW China

本文选取重庆中梁山岩溶槽谷区的表土和苔藓样品做孢粉分析,探讨其与现代植被的关系,并初步推断中梁山岩溶洼地的花粉来源,为其洼地剖面花粉来源提供参考。结果表明:表土花粉组合与现代植被类型具有较好的对应关系,耕地、撂荒地、灌木丛、马尾松林以及竹林能够较好地反映母体植被的群落组成;混交林与母体植被群落对应关系较差。由于洼地对区域花粉的汇聚作用,其表土花粉谱更能反映整个区域的植被状况。洼地表层样品中松属花粉来源是中梁山地区与西南风区域的花粉;落叶栎属、桤木属、枫杨属、葎草属等的主要来源是周围山地;禾本科花粉来源相对复杂。本研究可为在这一地区利用孢粉学开展第四纪古植被、古气候和古环境等研究提供参考性依据。

The objective of this work was to ascertain the sources of pollen in the karst depression of the Zhongliang mountains,Chongqing.On samples of surface soil and moss polsters from a karst trough in this area,we examined the relationship between pollen assemblages and modern vegetation by pollen analysis.The result show that the pollen assemblages have a good correspondence to each vegetation type.Cultivated areas,abandoned areas,shrub lands,pinus massoniana forests and bamboo forests can better reflect the composition of the parent vegetation community.The mixed forest and the parent vegetation community have a poor correspondence,and the main sporepollen types show adaptability to the karst environment feature.Depression surface samples can reflect regional vegetation more than other samples due to convergence of the depression.Among the pollen of depression surface zones,pinus pollen is over-representative,which is from the Zhongliang mountains area and the southwest wind area.Quercus,Alnus,Pterocarya and Humulus can partly reflect the vegetation,which mostly come from the vegetation in the surrounding mountains.Poaceae has a low-representative feature,of which the sources are relatively complex.These results will provide useful information for the study of Quaternary paleovegetation,paleoclimate as well as paleoenvironment using palynology in this area.