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| 1 | 晚全新世东海泥质区物源输入、源区植被变化及其影响因素:来自MD06-3039A孔的正构烷烃记录显示文摘东海泥质区具有稳定的连续沉积,为开展气候环境演变提供了良好的研究载体,但前人主要侧重于沉积模式、季风、洋流及海洋环境研究,关于有机碎屑输入、源区植被变化及其影响因素等方面的研究还较缺乏。本研究通过晚全新世以来东海泥质沉积序列MD06-3039A的正构烷烃等有机地球化学指标分析,发现该区域4400 cal.a B.P.以来沉积有机质具有明显的陆源高等植物输入特征,其中在3200~1300 cal.a B.P.陆源输入相对减少,被认为与该区域夏季风减弱有关。nC31/nC27正构烷烃的变化表明,物源区植被呈现3个阶段的波动,早、晚阶段草本植物相对增多,中阶段3200~1300 cal.a B.P.木本植物相对较多;与此同时,植被变化呈现次一级的波动,如隋唐大暖期草本增多,明清小冰期早期木本增多。研究认为,这个区域的草/木本植物变化对气候冷暖变化的响应可能更明显。1300 cal.a B.P.以来气候总体上继续呈凉干状态,但草本植物大量增多,这与前阶段气候变冷呈现的木本植物相对增多不同,暗示人类活动土地利用方式的改变导致植被类型发生了变化。 | 郑邦 周斌 王可 庞洋 陈明德 郑洪波 | 2018 | 第四纪研究2018，38，5： | 11 |
| 2 | The Stable Carbon Isotopic Compositions of n-Alkanes in Sediments of the Bohai and North Yellow Seas: Implications for Sources of Sedimentary Organic Matter显示文摘Stable carbon isotopic compositions of n-alkanes in surface sediments of the Bohai and North Yellow Seas were investigated to elucidate sources of sedimentary organic matter in these seas. The long-chain n-alkanes in surface sediments are predominantly long-chain C27, C29, and C31 types, with obvious odd carbon predominance. The δ13 C values of long-chain n-C27, n-C29, and n-C31 alkanes are-30.8% ± 0.5‰,-31.9% ± 0.6‰, and-32.1% ± 1.0‰, respectively, within the range of n-alkanes of C3 terrestrial higher plants. This suggests that sedimentary n-alkanes are derived mainly from terrestrial higher plants. Compound-specific carbon isotopic analysis of long-chain n-alkanes indicates that C3 terrestrial higher plants predominate(64%–79%), with angiosperms being the main contributors. The n-alkane δ13 C values indicate that mid-chain n-alkanes in sediments are derived mainly from aquatic emergent macrophytes, with significant petroleum pollution and bacterial degradation sources for short-chain n-alkanes. | DANG Tianxiang CAO Yunyun XING Lei | 2021 | Journal of Ocean University of China2021，20，2： | 0 |
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