排序方式: 共有1条查询结果,搜索用时 0 毫秒
1
1.
Xiaodong Liu Liguang Sun Gangjian Wei Yuhong Wang Hong Yan Kexin Liu Xiaohong Wu 《Journal of Paleolimnology》2008,40(4):987-1002
Abundant ostracode valves (Cyprinotus cingalensis) and caryopses of Urochloa paspaloides, a terrestrial grass, were well preserved in the lacustrine sediments of the Cattle Pond on Dongdao Island, South China Sea.
Oxygen and carbon isotopes, and elements (Ca, Mg) were analyzed on ostracode valves and plant caryopses in this study. The
δ18Oostracode and δ13Costracode exhibited a positive and statistically significant correlation, and showed a decreasing trend toward the top of sediment
sequence with some fluctuations, indicating a gradual increase in effective moisture. The Mg/Ca ratios in the ostracode shells,
generally used as a proxy for salinity changes in lake water, showed a trend toward lower values in the upper samples, reflecting
a gradual decrease of salinity in the lake. The δ13Corg values in the plant caryopses of the upper 14 cm of sediment have lower values than those in the bottom sediments, suggesting
less water and salinity stress. These results indicate increasing effective moisture and rainfall intensity over the past
∼1,100 years on Dongdao Island. 相似文献
1