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人类活动导致的富营养化与赤潮爆发致使近年来长江口缺氧区日益扩大,厌氧氨氧化过程已经被指出在缺氧区的氮循环中发挥着重要作用.梯烷脂作为一种生物标志物已被用来指示不同生态系统中厌氧氨氧化活动,但悬浮颗粒物中厌氧氨氧化菌和梯烷脂的来源尚不明确.本文通过对春、夏季节长江口悬浮颗粒物中多参数生物标志物进行分析,来研究梯烷脂的来源及其对厌氧氨氧化活动和缺氧区的指示.陆源生物标志物(长链正构烷烃和直链醇)、海源生物标志物(菜子甾醇和甲藻甾醇)和相对陆源有机质指标TMBR(terrestrial and marine biomarker ratio)、BIT(branched and isoprenoid tetraether)的时空分布结果表明,海源有机质在春季(55%)和夏季(86%)都占主要地位.梯烷脂与海源和陆源生物标志物的相关性表明,梯烷脂主要在水体中原位产生,长江口悬浮颗粒物中梯烷脂的浓度主要反映了水体中厌氧氨氧化活动的强度,但梯烷脂的浓度也会受到厌氧氨氧化菌种群结构的影响.本文研究结果表明,厌氧氨氧化活动在长江口海域广泛存在,夏季较高的梯烷脂含量(特别是在上升流区)对应着较低的溶解氧的含量,表明其指示缺氧区的可能性.
The eutrophication caused by human activities and the outbreak of red tide cause the anoxia area of Changjiang Estuary to expand in recent years. Anaerobic ammonium oxidation process has been reported to play an important role in the nitrogen cycle in hypoxic area. As a biomarker, The anammox activity in different ecosystems has been used to indicate the anammox activity in different ecosystems, but the origin of anammox bacteria and estrone in aerosols is not clear.In this paper, Biomarkers (long-chain n-alkanes and linear alcohols), marine biomarkers (brassicasterol And diterpene sterol) and terrestrial and marine biomarker ratios (TMBR) and BIT (branched and isoprenoid tetraether), respectively, showed that the marine organic matter was dominant in both spring (55%) and summer (86%) The correlation between the ladder alkanes and marine and terrestrial biomarkers showed that the main alkanes were produced in situ in the water body and the concentration of the ladder alkanes in the suspended particulate matter in the Yangtze River Estuary mainly reflected the water In the anaerobic ammonium oxidation activity intensity, but the concentration of estrogen is also affected by the structure of the anammox bacteria population.The results show that the anammox activity widespread in the Yangtze River estuary, higher in summer The content of estrogen, especially in the ascending stream, corresponds to a lower dissolved oxygen content, indicating its potential for anoxic zones.