This paper presents a 40000-year-long high-resolution mangrove record from sediments of Core 18300,18302 and 18323 on the continental shelf of the southern South China Sea and reconstructs the coast-line changes on Su...This paper presents a 40000-year-long high-resolution mangrove record from sediments of Core 18300,18302 and 18323 on the continental shelf of the southern South China Sea and reconstructs the coast-line changes on Sunda Shelf since the last 40000 years. In the period Marine Isotope 3,the old Sunda Shelf had low sea level,and it was partly exposed. Flourishing vegetations grew on the exposed old land. Mangroves developed along the coastline. On the Last Glacial Maximum,the sea level dropped greatly,coastline moved from inner shelf to outer shelf,the Old Sunda Land exposed further,and the lowering sea level induced the gradual disappearing of mangroves from the inner Sunda Shelf to the outer Sunda Shelf. And pioneer vegetation ferns covered the broadly exposed old land immediately. At the time of the last Deglaciation,sea level rose greatly,the coastline moved to the sea and the Sunda Shelf was drown again. Mangroves were emergent again from outer shelf to inner shelf and developed quickly.展开更多
This paper presents 16500-year-long high-resolution pollen and spore records from sediments of core 18287 on the continental slope of the southern South China Sea. In the period of 16.5―13.9 ka B.P., the low-mountain...This paper presents 16500-year-long high-resolution pollen and spore records from sediments of core 18287 on the continental slope of the southern South China Sea. In the period of 16.5―13.9 ka B.P., the low-mountain rainforest dominated the continental slope of the South China Sea. And in the period of 13.9―10.2 ka B.P., the lowland rainforest and ferns expanded greatly, while the low-mountain rainforest shrank, which indicated a warming at the last deglaciation. Also during this period, the pollen sedi-mentation rates reduced sufficiently. This might imply a rise of the sea level and therefore the sub-mergence of the shelf, resulting in the broadening of the distance between the source area and the slope. After 10.2 ka B.P, decreasing of the fern indicates the early Holocene (10.2―7 ka B.P.) is a cold period, while the increasing of fern marks the rising temperature (7―3.6 ka B.P.).展开更多
基金the National Key Basic Develop Research Program (Grant No.G2000078500)
文摘This paper presents a 40000-year-long high-resolution mangrove record from sediments of Core 18300,18302 and 18323 on the continental shelf of the southern South China Sea and reconstructs the coast-line changes on Sunda Shelf since the last 40000 years. In the period Marine Isotope 3,the old Sunda Shelf had low sea level,and it was partly exposed. Flourishing vegetations grew on the exposed old land. Mangroves developed along the coastline. On the Last Glacial Maximum,the sea level dropped greatly,coastline moved from inner shelf to outer shelf,the Old Sunda Land exposed further,and the lowering sea level induced the gradual disappearing of mangroves from the inner Sunda Shelf to the outer Sunda Shelf. And pioneer vegetation ferns covered the broadly exposed old land immediately. At the time of the last Deglaciation,sea level rose greatly,the coastline moved to the sea and the Sunda Shelf was drown again. Mangroves were emergent again from outer shelf to inner shelf and developed quickly.
基金Suppored by the National Key Basic Development Research Program (Grant No. G2000078500)
文摘This paper presents 16500-year-long high-resolution pollen and spore records from sediments of core 18287 on the continental slope of the southern South China Sea. In the period of 16.5―13.9 ka B.P., the low-mountain rainforest dominated the continental slope of the South China Sea. And in the period of 13.9―10.2 ka B.P., the lowland rainforest and ferns expanded greatly, while the low-mountain rainforest shrank, which indicated a warming at the last deglaciation. Also during this period, the pollen sedi-mentation rates reduced sufficiently. This might imply a rise of the sea level and therefore the sub-mergence of the shelf, resulting in the broadening of the distance between the source area and the slope. After 10.2 ka B.P, decreasing of the fern indicates the early Holocene (10.2―7 ka B.P.) is a cold period, while the increasing of fern marks the rising temperature (7―3.6 ka B.P.).
