论文部分内容阅读
对江苏连云港藤花落遗址两个剖面的55个样品进行孢粉分析,对比Rb/Sr,结果表明:1)龙山文化出现之前,银杏科、胡桃科、榆属、常绿栎属、桑属百分含量高,松属、云杉属少,莎草科含量很高,藜、蒿花粉含量很低,植被特征以落叶阔叶树为主。2)龙山文化早期,木本花粉含量逐渐降低直至处于低谷期,草本花粉逐渐占主导。胡桃、枫杨、落叶栎、桑等阔叶树数量显著减少,松的数量显著增加,草本花粉中藜科、蒿属含量少,莎草科、香蒲属数量仍较高,此时植被特征为含少量针叶树种的落叶阔叶林,林下草本植物繁盛。Rb/Sr较低,推测该阶段可能存在显著的降温;草本花粉中,禾本科花粉占主导地位,说明人类活动影响显著;木本花粉百分含量、Rb/Sr变化波动较大,可能存在气候突变事件。3)在龙山文化之间的自然沉积层,乔木和灌木数量增加,草本数量减少,木本植物占优势。落叶栎、栗、榆、桑含量高,出现常绿栎,莎草科数量很低,水龙骨数量多,此时为含常绿树种的落叶阔叶树为主的植被特征。4)龙山文化晚期,木本植物占优势。在乔木和灌木植物中,榆属、常绿栎属、落叶栎属、枫杨属数量较高,含少量的银杏科、松属;草本植物中,藜科、蒿属植物数量少,莎草科植物含量高,反映了含常绿成分的亚热带落叶阔叶林景观,此时,Rb/Sr值较高,因此推测此时的气候较温暖湿润。5)藤花落遗址地层记录了4500~4000aB.P.植被与气候环境信息,响应于中国东部季风区中晚全新世转型期间由暖湿转向温凉干燥的气候环境变化特点。
Pollen analysis of 55 samples collected from two sections of Tenghua Luo ruins in Lianyungang, Jiangsu province showed that: 1) Before the appearance of Longshan culture, Ginkgoaceae, Walnaceae, Ulmus, evergreen Quercus, High content of Pinus, Picea, Cyperaceae content is high, Quinoa, Artemisia pollen content is very low, the deciduous broad-leaved tree-based vegetation characteristics. 2) In the early stage of Yongsan culture, the content of woody pollen decreased gradually till the low stage, herbaceous pollen gradually dominated. The number of broadleaved trees such as walnut, Chinese maple, Quercus mongolica and mulberry decreased significantly and the quantity of pine increased significantly. The populations of Chenopodiaceae and Artemisia in the herbaceous pollens were less, but the sedum families and cattail genus were still higher. Coniferous deciduous broadleaf forest, understory herbs prosperous. Rb / Sr is low, suggesting that there may be significant temperature drop at this stage. Among herbaceous pollens, grass pollen dominated, indicating significant human activities. Woody pollen percentage and Rb / Sr fluctuated greatly and may have climate Mutation events. 3) In the natural sediments of Longshan culture, the number of trees and shrubs increased, the number of herbs decreased and the woody plants dominates. The deciduous oak, chestnut, elm, mulberry content is high, there are evergreen oak, sedge Branch number is very low, the number of water keel, this time for the evergreen species containing deciduous broad-leaved tree-based vegetation characteristics. 4) Late Longshan culture, woody plants dominate. In the trees and shrubs plants, Ulmus, evergreen Quercus, Quercus deciduous, Maple Populus is a high number, with a small amount of Ginkgoaceae, Pinus; herbaceous plants, Chenopodiaceae, Artemisia small number of sedge High plants, reflecting the evergreen component of the subtropical deciduous broad-leaved forest landscape, at this time, Rb / Sr value is higher, so presumably at this time the climate is warm and humid. 5) The Tenghaoluo Formation stratigraphy records 4500-4000aB.P. Vegetation and climatic environmental information and responds to the change of climatic and environmental characteristics from warm and wet to warm and dry during the transition from middle-late Holocene in the monsoon region of eastern China.