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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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摘要

Carbon stable isotopes (δ13C) of particulate organic matter (POM) are useful indicators for tracking the sources of organic matter, CO2 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 δ13CPOM along latitudinal, morphometric and biogeochemical gradients, and the feasibility of utilizing δ13CPOM as an indicator for lake metabolism. Results from this analysis revealed a large variation in δ13CPOM among lakes with a range from −46.2 to −13.0‰ and a median of −29.7‰. The δ13CPOM 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 CO2. The combination of these factors may play a significant role in shaping the pattern of δ13CPOM distribution. A multiple regression model using matching data (n = 92 lakes) indicated that latitude, lake size and TP concentration were the important factors determining δ13CPOM, although only 25% of the variance in δ13CPOM was explained by the model. Compared to the average δ13C value (−27‰) of terrestrial plants, 165 lakes (72%) in this analysis were isotopically depleted in δ13CPOM, 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 CO2 to the atmosphere.
机译：颗粒有机物（POM）的碳稳定同位素（δ13 C）是追踪湖泊中有机物来源，CO2 浓度，初级生产力和营养基础的有用指标。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δ13 CPOM 在纬度，形态和生物地球化学梯度上的分布模式，以及利用δ13 CPOM < / sub>作为湖泊新陈代谢的指标。分析结果表明，各湖泊之间的δ13CPOM变化很大，范围为−46.2至−13.0‰，中位数为−29.7‰。 δ13​​ CPOM 一般从低纬度到高纬度下降，总磷（TP），pH值，湖泊尺寸减小和CO2分压增加。这些因素的组合可能对塑造δ13 CPOM 分布的模式起重要作用。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δ13 CPOM 的重要因素，尽管δ13 CPOM 。与陆地植物的平均δ13 C值（-27‰）相比，本次分析中165个湖泊（72％）的同位素同位素δ13 CPOM 耗竭，平均值为-31.5 ‰，表明陆地有机物的异源贡献。这一发现与以下观点是一致的：世界上大多数湖泊都得到了陆地上的碳补贴，并且是大气中二氧化碳的来源。

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  • 来源
    《Limnology》 |2012年第2期|p.253-260|共8页
  • 作者

    Dongyan Liu; Gang Chen; Yuncong Li; Binhe Gu;

  • 作者单位

    College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, 200234, China;

    College of Fishery, Guangdong Ocean University, Zhanjiang, 524088, China;

    Soil and Water Department, University of Florida, Gainesville, FL, 32611, USA;

    Soil and Water Department, University of Florida, Gainesville, FL, 32611, USA;

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  • 正文语种 eng
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  • 关键词

    Carbon stable isotopes; Isotope depletion; Latitude; pCO2; POM; Trophic state;

    机译：碳稳定同位素同位素耗竭纬度pCO2 POM营养状态;

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