Distribution of hopanoids along a land to sea transect: Implications for microbial ecology and the use of hopanoids in environmental studies
Distribution of hopanoids along a land to sea transect: Implications for microbial ecology and the use of hopanoids in environmental studies
复制标题
藿香类化合物沿陆地到海洋横断面的分布：对微生物生态学和藿香类化合物在环境研究中的应用的影响
DOI：
10.4319/lo.2011.56.5.1850
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发表时间：
2011
影响因子：
4.5
通讯作者：
R. Pancost
中科院分区：
文献类型：
--
作者：
Chun Zhu;H. Talbot;T. Wagner;Jianming Pan;R. Pancost
细菌藿烷多元醇（BHPs）是多种细菌的脂质成分，在分类和环境诊断方面具有很大的潜力。为了研究BHPs的环境行为及其在生物地球化学过程追踪中的潜力，我们分析了从长江中游集水区到东海陆架的土壤和表层沉积物中的BHPs和地藿烷（BHPs的成岩产物）。这些数据与土壤中BHP分布的最新调查进行了比较，包括北极、温带、亚热带和热带地区。区域气候差异，特别是温度差异，可能对土壤中BHP的分布起重要的控制作用。在水生（河流-河口-陆架）环境中，BHP浓度和结构多样性明显低于土壤，这表明水生环境中的细菌生物多样性较低，或者对藿烷类化合物的合成没有相同的要求。然而，不同的水生状态差异很大：生物地球化学动态的长江口BHP多样性高，BHP产量增加，而寡营养ECS开放陆架BHP分布均匀，结构多样性少得多。基于土壤标记物BHPs对细菌藿烷甾醇相对丰度的Rsoil指数被认为是一种追踪海洋沉积物土壤有机质输入的新方法。Rsoil指数从河流到ECS呈下降趋势，与支链和类异戊二烯四醚指数呈强相关性，与有机碳δ13C值和高等植物生物标志物浓度呈中等相关性，表明它们至少具有追踪土壤有机质输入到ECS的能力。
Bacteriohopanepolyols (BHPs) are lipid constituents of diverse bacteria and have great potential as taxonomically and environmentally diagnostic biomarkers. In order to examine their environmental behavior and potential for tracing biogeochemical processes, we analyzed BHPs and geohopanoids (the diagenetic products of BHPs) in soils and surface sediments from the middle Yangtze River catchment to the East China Sea (ECS) shelf. These data are compared to an up‐to‐date survey of BHP distributions in soils, including regions collectively covering the Arctic, temperate, subtropics, and tropics. Regional climatic differences, particularly temperature, likely exert an important control on BHP distributions in soils. In the aquatic (river–estuary–shelf) setting, BHP concentrations and structural diversity are substantially lower than in soils, suggesting that in aquatic environments either bacterial biodiversity is lower or there is not the same requirement for hopanoid synthesis. However, different aquatic regimes vary substantially: high BHP diversity and enhanced BHP production occur in the biogeochemically dynamic Yangtze estuary, whereas BHP distribution is uniform with much less structural diversity in the oligotrophic ECS open shelf. The Rsoil index, based on the relative abundances of soil‐marker BHPs against bacteriohopanetetrol, is suggested as a new approach to trace soil organic matter input into marine sediments. The Rsoil indices decrease from the river to the ECS, correlating strongly with branched and isoprenoid tetraether indices and moderately correlating with δ13C of organic carbon values and the concentrations of higher plant biomarkers, demonstrating their ability to trace soil organic matter inputs at least to the ECS.
影响因子：
3
作者：
L. Handley;H. Talbot;M. Cooke;Kathleen E. Anderson;T. Wagner
通讯作者：
L. Handley;H. Talbot;M. Cooke;Kathleen E. Anderson;T. Wagner