Spatial distribution and inhibition by ammonium of methane oxidation in intertidal freshwater marshes
Spatial distribution and inhibition by ammonium of methane oxidation in intertidal freshwater marshes
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DOI：
10.1128/aem.63.12.4734-4740.1997
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发表时间：
1997-12
影响因子：
4.4
通讯作者：
F. V. D. Nat;J. D. Brouwer;J. Middelburg;H. J. Laanbroek
中科院分区：
文献类型：
--
作者：
F. V. D. Nat;J. D. Brouwer;J. Middelburg;H. J. Laanbroek
在两个潮间带沼泽中，通过泥浆孵化实验研究了沉积物中的垂直分布和氨对甲烷氧化的抑制。这两个地点的主要植被类型（即芦苇和芦苇）以及海拔高度不同。芦苇地点相对于芦苇地点较高，导致洪水发生的频率和持续时间较低，因此甲烷氧化的可能性较高。甲烷氧化随着芦苇和芦苇浆的深度而减少，尽管与芦苇植物根部物质相关的甲烷氧化随着深度而增加。芦苇根物质的甲烷氧化能力有限，并且随着深度的增加没有显着增加。在所有样品中都观察到氨对甲烷氧化的抑制作用，并且取决于甲烷和铵的浓度。增加铵浓度导致更大的抑制作用，增加甲烷浓度导致更少的抑制作用。铵浓度必须超过甲烷浓度至少 30 倍才能有效抑制。该比例仅在沉积物的表层中发现。因此，潮间带沼泽中铵抑制甲烷氧化的生态相关性相当有限，并且仅限于表层。硝酸盐的产生仅限于 0 至 5 厘米深度的浆料。
In two intertidal marshes, the vertical distribution in the sediment and inhibition by ammonium of methane oxidation were investigated by slurry incubation experiments. The two sites differ in their dominant vegetation type, i.e., reed and bulrush, and in their heights above sea level. The reed site was elevated with respect to the bulrush site, resulting in a lower frequency and duration of flooding and, consequently, a higher potential for methane oxidation. Methane oxidation decreased with depth in the bulrush and reed slurries, although methane oxidation associated with root material from the bulrush plants increased with depth. Reed root material had a limited capacity for methane oxidation and showed no significant increase with depth. Inhibition of methane oxidation by ammonium was observed in all samples and depended on methane and ammonium concentrations. Increasing ammonium concentrations resulted in greater inhibition, and increasing methane concentrations resulted in less. Ammonium concentrations had to exceed methane concentrations by at least 30-fold to become effective for inhibition. This ratio was found only in the surface layer of the sediment. Hence, the ecological relevance for ammonium inhibition of methane oxidation in intertidal marshes is rather limited and is restricted to the surface layer. Nitrate production was restricted to the 0- to 5-cm-depth slurries.