洛川黄土高原古植被变化的同位素和花粉证据

Lu Yudong, Gu Jinyan, Sun Jianzhong, Ma Yuan, Han Mingchao, Li Yan, L. Hongjuan
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引用次数: 0

摘要

对山西洛川剖面S0 ~ S11期黄土碳同位素进行了研究。δ13C曲线与深海钻探项目607钻孔的深海沉积物氧同位素曲线具有较好的一致性。S5古土壤δ13C呈负峰,δ13C含量为-16.6150/00,说明该时期气候适宜,植被可能为森林。与孢粉分析相比较,认为古土壤S0、S1、S4、S8、S9的δ13C含量为-5.85 ~ 10.000/00,植被类型为林草植被。古土壤S2、S3、S6、S7的d13C含量为-8.72~-6.950/00,植被为禾草。黄土L1、L2、L5、L6、L8、L9层为严重干冷冰期,δ13C含量为-3.7 ~ -2.270/00,植被类型为草原-荒漠。古植被类型的研究对黄土高原的土壤侵蚀防治具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Isotopic and pollen evidence of paleo-vegetation changes in loess plateau of Luochuan, China
Carbon isotopes in loess through S0 to S11 at Luochuan section in Shanxi province, China were studied. The curve of δ13C compares well to that of the oxygen isotope in deep sea sediments from Deep Sea Drilling Project Site 607 drill hole. There is a negative peak of δ13C within S5 paleosol where the content of δ13C is -16.6150/00, shows that the climatic of that period is optimum, and the vegetation is likely forest. Compared with the pollen analysis, we conclude that the vegetation type of palesol S0,S1,S4,S8,S9, whose δ13C content is -5.85--10.000/00, is forest-grass. The d13C content of paleosol S2, S3, S6, S7 is -8.72~-6.950/00, and their vegetation is grass. The loess layer L1, L2, L5, L6, L8, L9 represent the severe cold-dry glacial period with the δ13C content of -3.7- -2.270/00, and their vegetation belongs to steppe-desert. The research of paleo-vegetation type is significant to anti-soil erosion in the loess plateau of China.
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