福建漳浦六鳌半岛海岸沙丘记录的风沙气候变化

The sandstorm climate change indicated by coastal dune at Liuao peninsula of Zhangpu County in Fujian Province

对福建漳浦六鳌半岛海岸沙丘剖面(CDS)进行了粒度特征和成因判别分析,并以海岸线演变历史地图和CDS剖面在采样海岸沙丘上部位置为依据,初步建立了剖面的时间标尺,以代表海岸带风力作用的敏感粒度组分为主要指标,结合研究区其他记录的综合对比分析,讨论了福建东南沿海大约500a以来的气候环境演变.结果表明:(1)CDS剖面是以风力作用为主兼有生物成壤作用、波浪作用的多重影响形成的海岸沙丘沉积;(2)剖面中的多个黑色植物碳屑和根系层,可能反映了海岸带风力作用间歇性减弱、海岸沙丘固定的成壤期;(3)海岸沙丘沉积中指代风力作用的敏感粒度组分变化,可能记录了小冰期中福建东南沿海的3个冷期.

The paper discussed the sandstorm climate change during nearly 500 years in the southeast coast of Fujian province by distinguishing the causes of the coastal dune section （CDS） at Zhangpu county,analyzing the grain size parameters,building preliminarily its time scale on the basis of the historical charts of Chinese coastal evolution and the CDS section of the upper position of the sampled coastal dune and contrasting it with other sediments.The results show that：（1）the CDS section is coastal dune sediment shaped with the long-term effects of strong wind,as well as the bio pedogenesis effect and the effects of waves; （2）there are many black scraps and roots of plants in the CDS section,probably indicating the pedogenesis period with the wind force intermittently weakening and the coastal dune stabilizing; （3） the environmentally sensitive grain-size components of the coastal dune have changed,which may refer to the three Little Ice Ages in the southeast coast of Fujian province.