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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Burrow patchiness and oxygen fluxes in bioirrigated sediments
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Burrow patchiness and oxygen fluxes in bioirrigated sediments

机译：生物灌溉沉积物中的洞穴斑块和氧气通量

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Bioturbation plays a crucial role in benthic nutrient cycling in many sedimentary environments. Burrowing animals affect benthic-pelagic coupling by mixing sediment and porewater and increasing the effective area of diffusive exchange between oxidizing and reducing environments. Here, we report on a coupled laboratory-modeling experiment that explores organism distribution patchiness and its implications on sedimentary oxygen fluxes. Microcosms were established with three different arrangements of artificial burrows. Data from the laboratory were used to parameterize a three-dimensional diffusion-reaction model, and the impact of burrow distribution on benthic O_2 fluxes at the plot (decimeter) scale was assessed for a range of sediment reactivities representing a variety of benthic habitats. At high O_2 consumption rates, as seen in the microcosms, burrow spacing had little to no effect on sedimentary O_2 uptake; at intermediate rates, the overlap of oxic halos surrounding burrows and benthic O_2 uptake depended significantly on the burrow distribution pattern. Using observed relationships between benthic O_2 flux and oxygen penetration depth in marine sediments, we predict that burrow patchiness has its greatest impact in settings with benthic oxygen fluxes on the order of 1-10 mmol m~(-2)d~(-1) typical for the continental shelf and slope. The biogeo chemical heterogeneity caused by burrows also affects the interpretation of concentration measurements, and we present an estimate of the number of measurements needed to reliably estimate bulk O_2 concentra tions in cohesive sediments as a function of organism density, measurement scale and sediment reactivity.
机译：在许多沉积环境中，生物扰动在底栖养分循环中起着至关重要的作用。穴居动物通过混合沉积物和孔隙水并增加氧化和还原环境之间的扩散交换有效面积来影响底栖-上层耦合。在这里，我们报告了一个耦合的实验室模型实验，该实验探索了生物体分布的斑块及其对沉积氧通量的影响。建立了具有三种不同的人工洞穴的缩影。来自实验室的数据用于参数化三维扩散反应模型，并针对地块（分米）尺度上的洞穴分布对底栖O_2通量的影响进行了评估，以反映代表各种底栖生境的一系列沉积物活性。如在微观世界中看到的那样，在高O_2消耗速率下，洞穴间距对沉积O_2的吸收几乎没有影响。在中等速率下，洞穴周围的有氧晕和底栖O_2的重叠显着取决于洞穴的分布模式。利用底栖O_2通量与氧气在海洋沉积物中的渗透深度之间的关系，我们可以预测，在底栖氧气通量约为1-10 mmol m〜（-2）d〜（-1）的情况下，洞穴斑块的影响最大。典型用于大陆架和斜坡。洞穴引起的生物地球化学异质性也影响浓度测量的解释，我们提出了可靠地估计粘性沉积物中大量O_2浓度所需的测量数量的估计值，该数量随生物密度，测量规模和沉积物反应性而变。

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