Diurnal Cycle of Oxygen and Sulfide Microgradients and Microbial Photosynthesis in a Cyanobacterial Mat Sediment
Diurnal Cycle of Oxygen and Sulfide Microgradients and Microbial Photosynthesis in a Cyanobacterial Mat Sediment
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蓝藻垫沉积物中氧和硫化物微梯度的日循环以及微生物光合作用
DOI：
10.1128/aem.38.1.46-58.1979
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发表时间：
1979
影响因子：
4.4
通讯作者：
Y. Cohen
中科院分区：
文献类型：
--
作者：
B. B. Jørgensen;N. Revsbech;T. Henry Blackburn;Y. Cohen
研究了高盐沙漠湖（西奈太阳湖）底栖蓝藻垫中 O2、H2S 和 Eh 微梯度的日变化。结果与光强度、光穿透垫层、温度、pH、NH4+、光合活性、色素和微生物群落的分区有关。发现了极端的昼夜变化，白天在垫子表面以下 1 至 2 毫米深度处有 0.5 mM 的 O2 峰值，而在夜间在 2 至 3 毫米深度处有 2.5 mM 的 H2S 峰值。在O2-H2S界面处，两种化合物以0.2至1毫米的深度间隔共存，周转时间为几分钟。夏季透光区达到垫子内部2.5毫米，主要的14CO2光固定发生在1至2毫米的深度。冬季，光照和光合作用被限制在最上面1毫米。 O2 和 H2S 的定量动态是根据化学梯度和测量的扩散系数计算的。
The diurnal variation in the microgradients of O2, H2S, and Eh were studied in the benthic cyanobacterial mats of a hypersaline desert lake (Solar Lake, Sinai). The results were related to light intensity, light penetration into the mat, temperature, pH, NH4+, photosynthetic activity, pigments, and the zonation of the microbial community. Extreme diurnal variation was found, with an O2 peak of 0.5 mM at 1 to 2 mm of depth below the mat surface during day and a H2S peak of 2.5 mM at 2 to 3 mm of depth at night. At the O2-H2S interface, the two compounds coexisted over a depth interval of 0.2 to 1 mm and with a turnover time of a few minutes. The photic zone reached 2.5 mm into the mat in summer, and the main 14CO2 light fixation took place at 1 to 2 mm of depth. During winter, light and photosynthesis were restricted to the uppermost 1 mm. The quantitative dynamics of O2 and H2S were calculated from the chemical gradients and from the measured diffusion coefficients.