孢粉证据揭示MIS5a以来福建东北沿海地区人类活动、海平面及气候变化  

Palynological Record Revealed Anthropogenic Deforestation,Sea Level and Climate Changes since Marine Isotope Stage 5a in the Northeastern Coast of Fujian Province

作　　者：于俊杰[1] 彭博[1] 兰佑 武彬[1] 王继龙 丁大林 劳金秀[1] 李帅丽 戴璐 Yu Junjie;Peng Bo;Lan You;Wu Bin;Wang Jilong;Ding Dalin;Lao Jinxiu;Li Shuaili;Dai Lu(Nanjing Geological Survey Center,China Geological Survey,Nanjing 210016,China;No.4 Geological Brigade of Fujian Province,Ningde 352000,China;Key Lab of Submarine Geoscience and Prospecting Techniques,MOE,Qingdao 266100,China;Angers Joint Institute of Ningbo University,Ningbo 315211,China)

机构地区：[1]中国地质调查局南京地质调查中心,江苏南京210016 [2]福建省第四地质大队,福建宁德352000 [3]中国海洋大学海底科学与探测技术教育部重点实验室,山东青岛266100 [4]宁波大学昂热大学联合学院,浙江宁波315211

出　　处：《地球科学》2021年第1期281-292,共12页Earth Science

基　　金：中国地质调查局“宁德海岸带陆海统筹综合地质调查”项目(No.DD20189505).

摘　　要：通过获取了位于福建省宁德市海岸带的两个钻孔,并使用孢粉分析的方法来重建古环境.光释光和放射性碳十四测年结果表明,钻孔中最老的沉积物来自于深海氧同位素(MIS5a)阶段.孢粉组合中,海相沟鞭藻出现在MIS5a,MIS3早期和早、中全新世阶段,反映了这些时段的海侵事件.MIS5a以来,孢粉组合受控于常绿栎(Quercus)和松属(Pinus),指示了周边地区一直被亚热带阔叶林和松林所覆盖,表现了偏暖的亚热带气候.因此,孢粉证据揭示了末次盛冰期时该地区不存在大幅度的降温.芒萁属孢子和草本花粉的剧增指示了晚全新世以来宁德地区人类活动对天然植被的破坏.In this study,we analyzed pollen samples from two drilling cores located on the coast near Ningde city of Fujian Province for reconstruction paleoenvironment.Optical stimulated luminescence(OSL)and AMS 14C dating revealed that the oldest age in both cores was marine isotope stage(MIS5a).In pollen assemblages,marine dinoflagellate cysts occurred in MIS5a,early MIS3,early and middle Holocene,reflecting the transgression events in these phases.Since MIS5a,pollen assemblages were dominated by evergreen Quercus and Pinus,indicating that surrounding area was consistently covered by subtropical evergreen broadleaved forest and pine forest,which associated with warm subtropical climate.Therefore,this study confirmed that not obvious cooling occurred during the last glacial maximum(MIS2).Strong increase of Dicranopteris spores and non⁃arboreal pollen reflected that the human activity destroyed natural forest since the late Holocene in Ningde area.

关 键 词：福建宁德 孢粉 人类活动 海平面变化 深海氧同位素5a阶段 海洋地质 

分 类 号：P532[天文地球—古生物学与地层学]