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首页> 外文期刊>Journal of soil & sediments >Acetate and sulphate as regulators of potential methane production in a tropical coastal lagoon
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Acetate and sulphate as regulators of potential methane production in a tropical coastal lagoon

机译：乙酸盐和硫酸盐作为热带沿海泻湖潜在甲烷生产的调节剂

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Purpose: We evaluated the influence of acetate and sulphate addition on methanogenesis in sediment layers of cores of different carbon and sulphate concentrations from the littoral region colonized by Typha domingensis Pers. (area 1) and from the limnetic region (area 2) of a tropical coastal lagoon separated from the sea by a sandbar. We hypothesized that area 1 presents a proportionally smaller potential methane production (PMP) on sulphate addition than area 2. We further hypothesized that acetate addition stimulates proportionally greater PMP in area 2 sediment layers than in area 1.Materials and methods: The PMP rates were measured in sediment samples from three depths (0-2, 2-6, and 6-10 cm) in areas 1 and 2 for 89 days. The sediment incubations were prepared with additions of acetate (1 mM), sulphate (10 mM), and acetate plus sulphate (1 and 10 mM, respectively); the control treatment had no addition of acetate and/or sulphate. We also measured dissolved organic carbon (DOC), carbohydrates, and sulphate in the interstitial water.Results and discussion: PMP responded differently to acetate and sulphate addition. In general, PMP in area 2 was proportionally more stimulated by the addition of acetate and less inhibited by the addition of sulphate. In the 0-2-cm layer, the addition of acetate did not stimulate PMP in relation to the control in area 1, reaching a rate of 376.11 nmol CH4 g(-1) day(-1). In area 2, PMP was 5-fold higher in relation to the control, reaching 5.4 nmol CH4 g(-1)day(-1). Contrarily, in the 6-10-cm layer, sulphate addition inhibited PMP by 127.8-fold in relation to the control in area 1, reaching 0.6 nmol CH4 g(-1) day(-1). In area 2, PMP decreased 3.2-fold in relation to the control, reaching a value of 3.7 nmol CH4 g(-1) day(-1). These results agreed with the higher amounts of carbohydrates and lower amounts of sulphate in area 1 in the experiment beginning.Conclusions: Acetate and sulphate are effective PMP regulators in the sediment of two areas of a tropical coastal lagoon. Acetate increased PMP more in area 2, due to the lower sediment carbon availability. In contrast, sulphate decreased PMP more in area 1, due to the lower sulphate availability. The metabolic responses of methanogens and sulphate-reducing bacteria to natural and anthropogenic changes in carbon and sulphate availability are important for understanding the functioning of continental aquatic ecosystems, especially in scenarios of global climate change.
机译：目的：我们评估了乙酸和硫酸盐的添加对香蒲（Typha domingensis Pers）定居的沿海地区不同碳和硫酸盐浓度的岩心沉积层甲烷化作用的影响。 （区域1）和热带沿海泻湖的边缘区（区域2），沙洲与大海隔开。我们假设，区域1的硫酸盐添加量与区域2的比例成比例地小于潜在的甲烷生成量（PMP）。我们进一步假设，乙酸盐添加在区域2的沉积层中的比例成比例地大于区域1。材料和方法：PMP速率为在1区和2区三个深度（0-2、2-6和6-10 cm）的沉积物样本中测量了89天。通过添加乙酸盐（1 mM），硫酸盐（10 mM）和乙酸盐加硫酸盐（分别为1和10 mM）来制备沉淀物。对照处理不添加乙酸盐和/或硫酸盐。我们还测量了间隙水中的溶解性有机碳（DOC），碳水化合物和硫酸盐。结果与讨论：PMP对添加乙酸盐和硫酸盐的反应不同。通常，区域2中的PMP受乙酸的添加成比例的刺激，而受硫酸盐的抑制则更少。在0-2-cm层中，醋酸盐的添加相对于区域1中的对照而言不会刺激PMP，达到376.11 nmol CH4 g（-1）day（-1）的速率。在区域2中，PMP相对于对照高5倍，达到5.4 nmol CH4 g（-1）day（-1）。相反，在6-10-cm的层中，硫酸盐的添加相对于区域1的对照抑制PMP 127.8倍，达到0.6 nmol CH4 g（-1）day（-1）。在区域2中，PMP相对于对照降低了3.2倍，达到3.7 nmol CH4 g（-1）day（-1）的值。这些结果与实验开始时区域1中碳水化合物含量较高和硫酸盐含量较低相符。结论：乙酸盐和硫酸盐是热带沿海泻湖两个区域沉积物中有效的PMP调节剂。醋酸盐在区域2中的PMP增加更多，这是因为沉积物碳的利用率较低。相反，由于较低的硫酸盐利用率，硫酸盐使区域1中的PMP降低更多。产甲烷菌和减少硫酸盐的细菌对自然和人为变化的碳和硫酸盐可利用量的代谢反应，对于了解大陆水生生态系统的功能非常重要，特别是在全球气候变化的情况下。

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