云南拱王山地区全新世以来的环境变化记录

对云南小江流域拱王山狐狸房峰南北两侧的老碳房(海拔3 597 m)及石板塘(海拔3 689 m)冰川湖泊沉积剖面进行地球化学元素和孢粉分析,结合14C年代,探讨了研究区全新世以来的气候环境。结果表明,该区全新世主要经历了6次较明显的气候波动,即8.4~7.7 ka气候凉湿;7.7~6.5ka气候冷湿;6.5~4.7 ka气候冷干;4.7~2.1 ka气候凉湿;2.1~1.0 ka气候温湿;1 ka至今气候以暖湿为主。此分析结果反映了本区全新世以来各个不同时段的气候变化与东南季风、西南季风的双重影响印记,与目前中国全新世新冰期与高温期交替及其气温变化规律有一定的耦合与差异。

RECORD OF THE ENVIRONMENTAL CHANGE SINCE HOLOCENE IN THE REGION OF GONGWANG MOUNTAIN,YUNNAN PROVINCE

Two continuous glaci-lacustrinal sedimentary profiles,Laotanfang(3 597 m) and Shibantang(3 689 m),situated on the southern and northern sides of the Hulifang Peak of the Xiaojiang River Basin,Yunnan Province were studied herein.The environmental change indices are related to geochemical element and pollen analyses,together with the 14C dating.Climate environmental changes since the Holocene in the study region were discussed.The results showed that the climate fluctuated in different stages during the Early Holocene,that is,the climate was cool and wet during 8.4-7.7ka,cold and wet during 7.7-6.5ka,cold and dry during 6.5-4.7ka,cool and wet during 4.7-2.1 ka,warm and wet during 2.1-1.0ka,and warmer and wet since the 1 ka.The results reflected that climate changes are related to the double influence of southwest and southeast monsoons at different stages during the Holocene.These are somewhat coupling and difference for climate changes since the Holocene in China.