Distribution of branched glycerol dialkyl glycerol tetraethers in soils on the Northeastern Qinghai-Tibetan Plateau and possible production by nitrite-reducing bacteria

查看全文 作　　者：SUN [1,2]ChiJun;ZHANG [1]ChuanLun;LI Fu [1]Yan;WANG [3]HuanYe;LIU [3]WeiGuo

机构地区：[1]State Key Laboratory of Marine Geology, Tongji University;[2]Department of Earth and Planetary Sciences, Northwestern University;[3]State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences

出　　处：《Science China Earth Sciences》索引2016年第59卷第9期,共13页

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 41373072, 40873011 &41030211);the Shanghai Bureau of Science and Technology (Grant No. 13JC1405200);the Thousand Talents Program through the State Key Laboratory of Marine Geology at Tongji University (C. L. Zhang) 摘　　要：Branched glycerol dialkyl glycerol tetraethers(b GDGTs) are ubiquitous and abundant in soils, but their sources remain elusive. Recent studies demonstrate that the distributions of b GDGTs are sensitive to various environmental factors. In an effort to understand how and to what extent soil moisture(expressed as soil water content(SWC) or mean annual precipitation(MAP), p H and temperature may impact the distribution of b GDGTs, and to shed more light on the biological sources of b GDGTs in cold and arid regions, we investigated the distribution of b GDGTs as well as bacterial 16 S r RNA gene and functional genes involved in the N cycle(including amo A, nir S and nir K) in 41 surface soil samples from around Lake Qinghai and east of Qaidam Basin on the Northeastern Qinghai-Tibetan Plateau. We found that lower soil moisture reduced the fractional concentrations of cyclic b GDGTs and thus the cyclisation ratio of branched tetraethers(CBT) index correlated negatively with SWC and MAP, suggesting that soil moisture is an important factor controlling b GDGT distributions in soils in this arid and semi-arid region. Two subgroups of b GDGTs were assigned on the basis of cluster analysis, and b GDGT indices behaved differently in the two groups, hinting at different biosynthetic mechanisms for b GDGTs under different environmental conditions. Real time PCR results showed that nir S and nir K genes correlated significantly with the concentration of b GDGTs, suggesting that the nir S- or nir K-encoding bacteria involved in denitrification might potentially be an additional biological source for soil b GDGTs(besides Acidobacteria). Moreover, our results also support the application of new indices based on 5-methyl b GDGTs and 6-methyl b GDGTs in reconstructing past temperature and p H variations in this region. 关键词：土壤水分含量青藏高原东北部青海湖二烷基甘油还原菌实时荧光定量PCR 柴达木盆地东部

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Distribution of branched glycerol dialkyl glycerol tetraethers in soils on the Northeastern Qinghai-Tibetan Plateau and possible production by nitrite-reducing bacteria

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