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GDGTs as indicators for organic-matter sources in a small subtropical river-estuary system
Organic Geochemistry ( IF 3 ) Pub Date : 2021-01-05 , DOI: 10.1016/j.orggeochem.2021.104180
Zhangyu Cheng , Fengling Yu , Xiaoyan Ruan , Peng Cheng , Nengwang Chen , Shuqin Tao , Yongqiang Zong , Huan Yang , Zhaoquan Huang

Recently, glycerol dialkyl glycerol tetraethers (GDGTs) have been successfully used to identify different sources for organic-matter in the offshore and open ocean areas, while their applicability in the coastal areas remains unclear. This study was carried out to investigate the behavior of GDGTs and their applicability as indicators for organic-matter sources in a small subtropical river-estuary system, the Jiulong River-Estuary system (JRES), southeastern China. In 2018, three groups of samples including riverbank soils, riverbed surface sediments, and estuarine surface sediments were collected and analyzed. The results supported three main findings: 1) The abundances of GDGTs and crenarchaeol, and the ratios of iGDGTs/bGDGTs, GDGT-0/crenarchaeol (GDGT-0/cren), crenarchaeol isomer / (crenarchaeol + crenarchaeol isomer) and the IIIa/IIa, were good indicators for organic-matter sources; 2) At the middle and lower reaches of West River, the abnormally high values of GDGT-0/cren ratio and bGDGT abundance might indicate anthropogenic-induced water eutrophication; and 3) The branched and isoprenoid tetraether index (BIT) was especially sensitive in indicating of the soil- vs marine-organic matter contribution to the total organic matter of estuarine sediments. The high BIT values at the estuary turbidity maximum zone (TMZ) and the mid estuary suggested that TMZ filtering effect, preservation conditions and extra sources of soils have impacted the organic-matter distribution. Understanding the behavior and application of GDGTs in such a system helps to improve research on organic carbon cycling in the coastal system.



中文翻译:

GDGTs作为小型亚热带河口系统中有机物来源的指标

近来,甘油二烷基甘油四醚(GDGT)已成功用于识别近海和远洋地区有机物的不同来源,但它们在沿海地区的适用性仍不清楚。这项研究是为了研究GDGTs的行为及其在小亚热带河河口系统九龙江河口系统(JRES)中作为有机质源指标的适用性。在2018年,收集并分析了三组样本,包括河岸土壤,河床表面沉积物和河口表面沉积物。结果支持三个主要发现:1)GDGTs和crenarchaeol的丰度,以及iGDGTs / bGDGTs,GDGT-0 / crenarchaeol(GDGT-0 / cren),crenarchaeol异构体/(crenarchaeol + crenarchaeol异构体)和IIIa / IIa,是有机物来源的良好指标;2)在西河中下游,GDGT-0 / c比和bGDGT丰度异常高可能表明人为引起的水体富营养化;3)分支和类异戊二烯四醚指数(BIT)在指示土壤与海洋有机物对河口沉积物总有机物的贡献方面特别敏感。河口浊度最大区(TMZ)和河口中部的高BIT值表明,TMZ的过滤效果,保存条件和土壤的额外来源已经影响了有机物的分布。了解此类系统中GDGT的行为和应用有助于改善沿海系统中有机碳循环的研究。2)在西河中下游,GDGT-0 / c比和bGDGT丰度异常高可能表明人为引起的水体富营养化;3)分支和类异戊二烯四醚指数(BIT)在指示土壤与海洋有机物对河口沉积物总有机物的贡献方面特别敏感。河口浊度最大区(TMZ)和河口中部的高BIT值表明,TMZ的过滤效果,保存条件和土壤的额外来源已经影响了有机物的分布。了解此类系统中GDGT的行为和应用有助于改善沿海系统中有机碳循环的研究。2)在西河中下游,GDGT-0 / c比和bGDGT丰度异常高可能表明人为引起的水体富营养化;3)分支和类异戊二烯四醚指数(BIT)在指示土壤-海洋有机物对河口沉积物总有机物的贡献方面特别敏感。河口浊度最大区(TMZ)和河口中部的高BIT值表明,TMZ的过滤效果,保存条件和土壤的额外来源已经影响了有机物的分布。了解GDGT在这种系统中的行为和应用有助于改善沿海系统中有机碳循环的研究。GDGT-0 / cren比值和bGDGT丰度值异常高可能表明人为诱导的水富营养化;3)分支和类异戊二烯四醚指数(BIT)在指示土壤与海洋有机物对河口沉积物总有机物的贡献方面特别敏感。河口浊度最大区(TMZ)和河口中部的高BIT值表明,TMZ的过滤效果,保存条件和土壤的额外来源已经影响了有机物的分布。了解此类系统中GDGT的行为和应用有助于改善沿海系统中有机碳循环的研究。GDGT-0 / cren比值和bGDGT丰度值异常高可能表明人为诱导的水富营养化;3)分支和类异戊二烯四醚指数(BIT)在指示土壤与海洋有机物对河口沉积物总有机物的贡献方面特别敏感。河口浊度最大区(TMZ)和河口中部的高BIT值表明,TMZ的过滤效果,保存条件和土壤的额外来源已经影响了有机物的分布。了解此类系统中GDGT的行为和应用有助于改善沿海系统中有机碳循环的研究。3)分支和类异戊二烯四醚指数(BIT)在指示土壤与海洋有机物对河口沉积物总有机物的贡献方面特别敏感。河口浊度最大区(TMZ)和河口中部的高BIT值表明,TMZ的过滤效果,保存条件和土壤的额外来源已经影响了有机物的分布。了解GDGT在这种系统中的行为和应用有助于改善沿海系统中有机碳循环的研究。3)分支和类异戊二烯四醚指数(BIT)在指示土壤与海洋有机物对河口沉积物总有机物的贡献方面特别敏感。河口浊度最大区(TMZ)和河口中部的高BIT值表明,TMZ的过滤效果,保存条件和土壤的额外来源已经影响了有机物的分布。了解此类系统中GDGT的行为和应用有助于改善沿海系统中有机碳循环的研究。

更新日期:2021-02-23
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