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首页> 外文期刊>Estuarine Coastal and Shelf Science >Microbial Availability And Degradation Of Dissolved Organic Carbon And Nitrogen In Two Coastal Areas
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Microbial Availability And Degradation Of Dissolved Organic Carbon And Nitrogen In Two Coastal Areas

机译：两个沿海地区微生物的有效性及其溶解性有机碳和氮的降解

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Microbial availability and degradation rates of dissolved organic carbon (DOC) and nitrogen (DON) were estimated at two coastal stations (Horsens Fjord and Darss Sill) in Denmark, by measuring the decrease in DOC and DON concentrations during long-term laboratory incubations (150 days). The experiments used two different treatments: one only receiving a microbial inoculum and another additionally to the inoculum, carbon and phosphate to ensure nitrogen limitation. The additions of carbon and phosphate led to increased DON bioavailability in all experiments. The incubations showed that bioavailable DOC (BDOC) accounted for 22 ± 13% of total DOC in Horsens Fjord and 14 ± 5% at Darss Sill. Bioavailable DON (BDON) accounted for 43 ± 10% (Horsens Fjord) and 28 ± 12% of DON (Darss Sill). The linear relations between BDOM and DOM suggested that the DOC variations in Horsens Fjord were controlled by the available fraction, while this was only partly the case for DOC at Darss Sill and DON (both stations), showing that the refractory pool to some degree controlled the seasonal variations in DOM at these coastal stations. Additionally we found that DOC and DON were cycled at approximately the same speed, probably due to a high carbon demand of the microbial community. Calculating the amounts of DON degraded within the two areas using the obtained decay rates showed that compared with the ambient inorganic nitrogen levels BDON contained a large proportion (52 ± 37%, Horsens Fjord and 74 ± 19%, Darss Sill) of the bioavailable nitrogen (BDON + DIN). These calculations further suggested that bioavailable DOM was washed out of the respective areas and could contribute to heterotrophic growth in adjacent waters.
机译：通过测量长期实验室孵化期间DOC和DON浓度的降低，估算了丹麦两个沿海站点（Horsens Fjord和Darss Sill）的微生物有效性和溶解性有机碳（DOC）和氮（DON）的降解率（150天）。实验使用了两种不同的处理方法：一种仅接受微生物接种，另一种除接种物，碳和磷酸盐之外以确保氮的限制。在所有实验中，碳和磷酸盐的添加导致DON生物利用度的提高。孵化显示，生物利用度DOC（BDOC）在霍尔森斯峡湾占DOC总量的22±13％，在Darss Sill占14±5％。生物利用度DON（BDON）占DON（Darss Sill）的43±10％（霍森峡湾）和28±12％。 BDOM和DOM之间的线性关系表明，霍尔森斯峡湾的DOC变化受有效馏分控制，而Darss Sill和DON（两个站点）的DOC只是部分情况，表明耐火材料池在一定程度上受到控制这些沿海站的DOM的季节性变化。此外，我们发现DOC和DON的循环速度大致相同，这可能是由于微生物群落对碳的需求较高。使用获得的衰减率计算两个区域中DON的降解量，结果表明，与周围的无机氮水平相比，BDON包含了很大一部分生物可利用氮（52±37％，霍森斯峡湾和74±19％，达斯西尔）。 （BDON + DIN）。这些计算结果进一步表明，生物可利用的DOM被冲出了各自的区域，并可能有助于邻近水域的异养生长。

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