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Global pattern of carbon stable isotopes of suspended particulate organic matter in lakes

机译:湖泊中悬浮颗粒有机物碳稳定同位素的全球格局

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Carbon stable isotopes (δ ~(13)C) of particulate organic matter (POM) are useful indicators for tracking the sources of organic matter, CO _2 concentrations, primary productivity and the trophic base in lakes. Here we provide a synthesis of literature data from 228 lakes around the world to assess the distribution pattern of δ ~(13)C _(POM) along latitudinal, morphometric and biogeochemical gradients, and the feasibility of utilizing δ ~(13)C _(POM) as an indicator for lake metabolism. Results from this analysis revealed a large variation in δ ~(13)C _(POM) among lakes with a range from -46. 2 to -13. 0‰ and a median of -29. 7‰. The δ ~(13)C _(POM) generally decreased from low to high latitude along with the decreases in total phosphorus (TP), pH, lake size and the increases in partial pressure of CO _2. The combination of these factors may play a significant role in shaping the pattern of δ ~(13)C _(POM) distribution. A multiple regression model using matching data (n = 92 lakes) indicated that latitude, lake size and TP concentration were the important factors determining δ ~(13)C _(POM), although only 25% of the variance in δ ~(13)C _(POM) was explained by the model. Compared to the average δ ~(13)C value (-27‰) of terrestrial plants, 165 lakes (72%) in this analysis were isotopically depleted in δ ~(13)C _(POM), with a mean of -31. 5‰, which is indicative of an allochthonous contribution of terrestrial organic matter. This finding is consistent with the view that the majority of lakes in the world receive a terrestrial subsidy of carbon and are sources of CO _2 to the atmosphere.
机译:颗粒状有机物(POM)的碳稳定同位素(δ〜(13)C)是追踪湖泊中有机物的来源,CO _2浓度,初级生产力和营养碱的有用指标。在这里,我们提供了来自全球228个湖泊的文献数据的综合,以评估δ〜(13)C _(POM)沿纬度,形态和生物地球化学梯度的分布模式,以及利用δ〜(13)C _的可行性。 (POM)作为湖泊新陈代谢的指标。分析结果表明,各湖泊之间的δ〜(13)C _(POM)差异很大,范围为-46。 2至-13。 0‰,中位数为-29。 7‰。 δ〜(13)C _(POM)通常随着总磷(TP),pH,湖泊尺寸的减小和CO _2的分压的增加而从低纬度降低到高纬度。这些因素的组合可能在塑造δ〜(13)C _(POM)分布的模式中起重要作用。使用匹配数据(n = 92个湖泊)的多元回归模型表明,纬度,湖泊大小和TP浓度是决定δ〜(13)C _(POM)的重要因素,尽管δ〜(13)的方差只有25%该模型解释了C_(POM)。与陆地植物的平均δ〜(13)C值(-27‰)相比,本次分析中165个湖泊(72%)的δ〜(13)C _(POM)同位素损耗,平均值为-31 。 5‰,表明了陆生有机质的外来贡献。这一发现与以下观点是一致的:世界上大多数湖泊都获得了陆地碳补贴,并且是大气中CO _2的来源。

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