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Comparison of the carbon isotope composition of total organic carbon and long-chain n-alkanes from surface soils in eastern China and their significance

ISSN号：1000-0240
期刊名称：《冰川冻土》
时间：0
分类：Q94[生物学—植物学]
作者机构：[1]State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China, [2]Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China, [3]Key Laboratory of Western China's Environment Systems, Ministry of Education, Lanzhou University, Lanzhou 730000, China
相关基金：Supported by the Knowledge Innovation Program of Chinese Academy of Sciences （Grant No. KZCX3-SW-152）, National Natural Science Foundation of China （Grant No. 40331009）, the Research Foundation of the State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences （Grant No. OGL-200604）, and the NSFC National Innovative Research Team Project （Grant No. 40721061）

作者： RAO ZhiGuo[1,2,3], JIA GuoDong[1], ZHU ZhaoYu[2], WU Yi[2], ZHANG JiaWu[3]

关键词：植物, 总有机碳, 碳同位素, 表面土壤, surface soils, C3/C4 plants, total organic carbon, n-aikanes, carbon isotopes

中文摘要：

在东方中国在高空间的分辨率上收集的表面土壤样品为碳同位素作文被分析(δ ¹³ C ) 全部的器官的碳(TOC ) 和更高导出植物的长链的 n 链烷，与作为加权的吝啬的价值报导的后者。δ ¹³ C 价值显著地被相关并且在空间变化显示出类似的趋势。δ ¹³ C 显示出不太否定的价值在在在更高、更低的纬度的 31 ° N 和 40 ° N 和更否定的之间中间纬度。这与从在一样的区域的表面土壤 phytoliths 的以前报导的碳同位素数据一致并且建议中间纬度的区域为 C4 植物提供相对有利的成长条件。而且， δ ¹³ C 从在北方中国从一块小草地收集的 12 件表面土壤样品 TOC 和长链的 n 链烷珍视在配对的 δ ¹³ 土壤的 C 取样遗体相对经常。我们的数据证明在东方中国，玷污 δ ¹³ TOC 和长链的 n 链烷的 C 作文是占优势的植被的 C ₃/C₄ 比率的有效指示物。这个工作建议 −22 ‰和 −32 ‰是为加权的吝啬的 δ ¹³ 从在主导的 C ₄ 或 C ₃ 植被下面的土壤的长链的 n 链烷(C ₂₇, C ₂₉ 和 C ₃₁n 链烷) 的 C 价值，允许我们重建 paleovegetation 趋势。

英文摘要：

Surface soil samples collected over a high spatial resolution in eastern China were analyzed for carbon isotope composition （δ^13C） of total organic carbon （TOC） and higher plant-derived long-chain n-alkanes, with the latter reported as weighted mean values. The two sets of δ^13C values are significantly correlated and show similar trends in spatial variation. The spatial distribution of δ^13C shows less negative values in the mid-latitudes between 31°N and 40°N and more negative ones at higher and lower latitudes. This is consistent with previously reported carbon isotope data from surface soil phytoliths in the same region and suggests that the mid-latitude area provides relatively favorable growing condi- tions for C4 plants. Furthermore, δ^13C values of both TOC and long-chain n-alkanes from 12 surface soil samples collected from a small grassland in north China displayed similar carbon isotope values and the difference between paired δ^13C of a soil samples remains relatively constant. Our data demonstrate that in eastern China, soil δ^13C composition of both TOC and long-chain n-alkanes is effective indicators of C3/C4 ratios of the prevailing vegetation. This work suggests that -22‰ and -32‰ are good es- timated end members for the weighted mean δ^13C values of long-chain n-alkanes （C27, C29 and C31 n-alkanes） from soils under dominant C4 or C3 vegetation, allowing us to reconstruct paleovegetation trends.

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