Utility of brGDGTs as temperature and precipitation proxies in subtropical China.

Utility of brGDGTs as temperature and precipitation proxies in subtropical China.
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brGDGT 作为中国亚热带温度和降水代理的应用

DOI:
10.1038/s41598-017-17964-0
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发表时间:
2018-01-09
期刊:
影响因子:
4.6
通讯作者:
Tian L
Tian L
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang M;Zong Y;Zheng Z;Man M;Hu J;Tian L

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细菌支化甘油二烷基甘油四醚(brGDGT)已成功地用于重建年平均气温(MAT)和土壤pH从沉积物的定量气候代用指标。然而,重建来自brGDGT在不同的水文和大气条件的地区需要进一步完善。在这项研究中,我们调查了brGDGT作为温度和降水的替代品,在中国亚热带梵净山相对的斜坡表层土壤的适用性。结果表明,MBT ′ 5ME反演的MAT具有明显的垂直递减率,在给定的海拔高度上,MAT存在坡间差异。此外,MBT ′ 5ME的MAT值更强的相关性,从3月到11月的MAT比全年。在海拔1400 m~1500 m处,根据雾层高度,pH梯度和CBT ′的pH梯度存在一个转折点,降水量在此转折点达到最大值。研究结果表明,brGDGT可以作为中国亚热带地区气候参数重建的指标。
Bacterial branched glycerol dialkyl glycerol tetraethers (brGDGTs) have been successfully used as quantitative climate proxies for reconstructing annual mean air temperature (MAT) and soil pH from sediments. However, reconstructions derived from brGDGTs in regions with diverse hydrological and atmospheric conditions require further refinement. In this study, we investigated the suitability of brGDGTs as temperature and precipitation proxies from surface soils on opposite slopes of Mount Fanjing in subtropical China. The results show a clear altitudinal lapse rate of MBT′5ME-derived MAT and between-slope differences in MAT at given altitude. Moreover, the MBT′5ME-derived MAT values are more strongly related to the MAT from March to November than that of the whole year. A turning point is also observed from the measured pH and CBT′-derived pH gradients at altitude of 1400 m~1500 m, in accordance with the fog horizon, where precipitation reaches the maximum value. The findings prove that brGDGTs from soil transects can be used as indicators for reconstructions of climate parameters from subtropical regions of China.
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