摘要
长江三峡巫山地区张家湾东周—汉代古遗址文化层中含有丰富的孢粉。孢粉数据分析 ,为研究本区东周—汉代时期人类活动的古地理环境提供了有利的资料。根据孢粉组合的变化 ,可把该区地层由上到下划为三个孢粉组合带 :带 1(生土层 )海金沙 (Lygodium)—卷柏— (Seleginella)—紫萁 (Osmunda)—松 (Pinus)孢粉带 ;带 2 (文化层 )菊科 (Compositae)—毛茛科的唐僧草(Thalictrum)孢粉带 ;带 3(文化层上部 )海金沙—紫萁—水龙骨科 (Polypodiaceae)— 榆 (Ulmus)—小芘 (Berberis)—栗 (Castanea)—慈菇 (Sagittaria)—泽泻 (Alisma) 孢粉带。这种孢粉组合的差异 ,反映各阶段人类活动古地理环境的变化。该区古人类活动初期处于暖湿的气候 ,东周—汉代时期转变为温凉略干的温带落叶阔叶林—草地景观 ,东周—汉代后气候逐渐由干变湿 ,植被由草原向森林转变 ,同时该区经历了一次规模较大的洪水泛滥期。
There were rich pollen in cultural layers in Zhangjiawan paleo-site in Wushan region, the three Gorges of Changjiang River during East Zhou to Han Dynasty. By pollen data analysis, it provides favorable data to study on plaeoenvironment of human activity in this region during East Zhou to Han Dynasty. Based on pollen association from up to down , three pollen groups could be divided such as follows: Group 1(Lygodium-Seleginella-Osmunda-Pinus), Group 2(Compositae-Thalictrum), Group 3 (Lygodium-Osmunda-Polypodiaceae-Ulmus-Berberis-Castanea-Sagittaria-Alisma). The difference among the pollen groups refers to environmental change by human activity in each stage. There was a subtropical zone in warm-humid climate before human activity. During East Zhou to East Han Dynasty there were temperature mixed forest landscape with deciduous and broad-leaf trees and grass landscape in warm-cold and a little arid climate. After this stage,the climate and vegetation types changed. The climate became wet,and vegetation types changed into forest. At the same time,a transient large-scale deluge took place in this area.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2001年第3期284-288,共5页
Resources and Environment in the Yangtze Basin
基金
国家自然科学基金! (批准号 :40 0 710 83)
南京大学海岸海岛开放实验室基金和南京大学现代分析中心基金
关键词
孢粉
古环境
长江三峡
东周-汉代遗址
张家湾
pollen
paleoenvironment
the three Gorges of Changjiang River
site of East Zhou to East Han Dynasty
