The "inverse altitude effect'' of leaf wax- derived n- alkane dD on the northeastern Tibetan Plateau
Bai, Y (Bai, Yan)[ 1,2 ]; Tian, Q (Tian, Qian)[ 1,3 ]; Fang, XM (Fang, Xiaomin)[ 1 ]; Wu, FL (Wu, Fuli)[ 1 ]
2014-08-01
发表期刊ORGANIC GEOCHEMISTRY
卷号73页码:90-100
文章类型期刊论文
摘要

The response of soil wax derived n-alkane hydrogen isotope values (dDwax, the abundance weighted average dD values of the C29 and C31 n-alkanes) and isotopic lapse rates (the average change in dDwax with elevation) to factors other than elevation change should be assessed and taken into account for quantitative elevation reconstructions. To shed more light on how plant wax derived n-alkanes may be used for this purpose, soil and Gramineae samples analyzed for dDwax values. Those were derived from the foreland basin, the mountain vegetation zone and glacier catchment areas along the Beida River (a tributary in the Heihe River Basin; up to the headwaters of the Qiyi glacier), and the Xiying River catchment (up to the headwaters and glaciated areas of the Lenglong Range), located on the northeastern Tibetan Plateau. For comparison, this study analyzed surface soils from the Maxian Mountains for dDwax. As a whole, the trend in dDwax in the study regions seems to primarily reflect dDrw (dD values of river water) and/or dDp (dD values of precipitation). These data show good inverse linear relationships between Gramineae and soil dDwax values and elevation (altitude effect) in the mountain vegetation zone of the Xiying River catchment (2200–3500 m) and Maxian Mountains (2800–3700 m), where the elevation effect becomes the main control factor even in the dry Qilian Mountains. However, at the low elevation sites, soil and Gramineae dDwax values from the Xiying River (1750–2200 m) and Maxian Mountains (2060–2800 m) show the ‘‘inverse altitude effect’’. The recycled fraction and trajectory of water vapor may result in these positive dDwax elevation gradients in dry continental settings. The ‘‘inverse altitude effect’’ has also been observed in periglacial regions below the Qiyi glacier and from the Lenglong Range. We interpret this effect as evidence of stronger fractionation processes occurring in the freeze–thaw mass exchange between the solid and liquid phases at high elevations. Thus, the ‘‘inverse altitude effect’’ can be attributed to the decrease of precipitation amount in the upper valley and to marked fractionation in soil water and the residual or melting snow in periglacial regions, which may complicate the isotope thermometry. When interpreting changes of long term dD and d18O records for determining elevation change, one must consider all possible influences on the lapse rate of dDwax values with elevation, including the patterns of atmospheric circulation in the past, topography, recycling of moisture in dry continental settings, and strong fractionation processes effecting soil and glacier melt water in the periglacial regions.

DOI10.1016/j.orggeochem.2014.05.013
收录类别SCI
语种英语
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9677
专题黄土与第四纪地质国家重点实验室(2010~)
通讯作者Fang, XM (Fang, Xiaomin)[ 1 ]
作者单位1.Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China;
2.State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi’an 710075, China;
3.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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Bai, Y ,Tian, Q ,Fang, XM ,et al. The "inverse altitude effect'' of leaf wax- derived n- alkane dD on the northeastern Tibetan Plateau[J]. ORGANIC GEOCHEMISTRY,2014,73:90-100.
APA Bai, Y ,Tian, Q ,Fang, XM ,&Wu, FL .(2014).The "inverse altitude effect'' of leaf wax- derived n- alkane dD on the northeastern Tibetan Plateau.ORGANIC GEOCHEMISTRY,73,90-100.
MLA Bai, Y ,et al."The "inverse altitude effect'' of leaf wax- derived n- alkane dD on the northeastern Tibetan Plateau".ORGANIC GEOCHEMISTRY 73(2014):90-100.
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