期刊文献+

Variation of soil Δδ^(13)C values in Xifeng loess-paleosol sequence and its paleoenvironmental implication 被引量:6

Variation of soil △δ ^(13)C values in Xifeng loess-paleosol sequence and its paleoenvironmental implication
下载PDF
导出
摘要 The carbon isotopic compositions of soil organic matter (SOM) and total carbonate (TC) in Xifeng loess-paleosol sequence have been studied. The δ 13CSOM values vary from ?23.8‰ to ?20.2‰, which are higher in interglacial than in glacial stages. Contrary to δ 13CSOM values, the δ 13CTC values vary from ?8.5‰ to ?3.6‰ and are lower in interglacial than in glacial stages. The differences (?δ 13C) be- tween the δ 13CSOM and δ 13CTC values vary from 14.1‰ to 19.4‰. Our results from the Xifeng loess- paleosol sequence indicate that the ?δ 13C values represent the ratio of primary carbonate (PC) to secondary carbonate (SC). The ?δ 13C values were high in the loess stages, and the maximal PC-to-SC ratio can reach 6:4. But in the paleosol stages, the ?δ 13C values were low, with a small proportion of PC. The ?δ 13C values in loess-paleosol sequence also indicate the contributions of the dust to the loess sediment in the Chinese Loess Plateau because the dust contains the PC. The carbon isotopic compositions of soil organic matter (SOM) and total carbonate (TC) in Xifeng Ioess-paleosol sequence have been studied. The δ^13CsoM values vary from -23.8‰ to -20.2‰, which are higher in interglacial than in glacial stages. Contrary to δ^13Csoi values, the δ^13CTc values vary from -8.5‰ to -3.6‰ and are lower in interglacial than in glacial stages. The differences (△δ^13C) between the δ^13CsoM and δ^13CTc values vary from 14.1‰ to 19.4‰. Our results from the Xifeng loesspaleosol sequence indicate that the △δ^13C values represent the ratio of primary carbonate (PC) to secondary carbonate (SC). The △δ^13C values were high in the loess stages, and the maximal PC-to-SC ratio can reach 6:4. But in the paleosol stages, the △δ^13C values were low, with a small proportion of PC. The △δ^13C values in Ioess-paleosol sequence also indicate the contributions of the dust to the loess sediment in the Chinese Loess Plateau because the dust contains the PC.
出处 《Chinese Science Bulletin》 SCIE EI CAS 2006年第11期1350-1354,共5页
基金 This work was supported by the National Natural Science Foundation of China (Grant Nos. 40599422, 40523002 & 40121303) the National Key Funds of China (Grant No. 2004CB720200).
关键词 黄土 古土壤 有机碳 碳酸盐 碳同位素 loess-paleosol, organic carbon, carbonate, carbon isotope.
  • 相关文献

同被引文献136

引证文献6

二级引证文献66

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部