苏拉威西海周边地区全新世 植被演化及气候变化
Vegetation and Climate Changes around Celebes Sea during Holocene

全新世时期的环境和气候变化是全球气候模拟、预测中不可或缺的资料.对苏拉威西海西北部MD98-2178 孔 (3.6200°N,118.7000°E,水深1984m)全新世的样品进行孢粉分析和浮游有孔虫氧稳定同位素测试,重建全新世苏拉威西海 周边地区植被演化和气候变化图景.根据孢粉记录得到:在全新世早期至7kaBP时,各孢粉组合浓度剧烈下降,指示海平面处 于上升阶段;在7~4kaBP时,各孢粉组合浓度都处于低谷,体现为高海平面期;在4kaBP之后,孢粉记录则显示海平面有小 幅的下降.在全新世中期,即5~4kaBP,热带高山雨林花粉含量明显上升,表明是温度低值期.蕨类孢子记录显示降雨量在全 新世早期是持续增加的,但在全新世中期之后,降雨量有所减少,这与陆地孢粉记录和印尼石笋记录的结果相似,体现全新世 该地区降雨量受海陆格局和太阳活动共同影响.
The environment and climate information during the Ho1ocene is indispensable data for the g1oba1 climate modeling and forecasting. Scenarios of regiona1 vegetation and climate changes around the Celebes Sea during the Ho1ocene are exp1ored based on the alyno1ogica1 and oxygen isotope records of core MD98-2178 (3.6200°N, 118.7000°E; 1 984 m water depth) from the northwest Celebes Sea in this study. Sea-1eve1 changes are discussed since the marine po11en record of core MD98-2178 is considered as an indicator. The sharp decline in concentration of a11 po11en groups during the Early Ho1ocene, ~10-7 ka BP, indicates a sea-1eve1 rise. A11 po11en groups at7-4 ka BP suggest sustaining of a high sea-1eve1. The marine po11en record after 4 ka BP shows a slight fa11 of sea-1eve1. The significant increase in po11en percentage of the tropica1 montane forest during the Middle Ho1ocene, 5-4 ka BP, suggests a much cold condition a1ong the Celebes Sea at the time. It is suggested that precipita- tion a1ong the Celebes Sea has been affected by variations of land-ocean distribution and solar activities. It is implied by fluctua- tion in fern spores record that precipitation was at a highleve1 during the Early Ho1ocene, but1owered after the Middle Ho1- ocene, which is in a similar pattern as indicated by the Indonesian stalagmite records