Land Use Controls on the Spatial Variability of Dissolved Black Carbon in a Subtropical Watershed,Environmental Science & Technology

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Land Use Controls on the Spatial Variability of Dissolved Black Carbon in a Subtropical Watershed
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-07-11 , DOI: 10.1021/acs.est.8b00190
J. Alan Roebuck ₁ , Michael Seidel ₂ , Thorsten Dittmar ₂ , Rudolf Jaffé ₁

Affiliation

Rivers export roughly 250 Pg of dissolved organic carbon (DOC) to coastal oceans. DOC exported from rivers can be a reflection of watershed dynamics, and changes in land use can lead to shifts in the molecular composition and reactivity of riverine DOC. About 10% of DOC exported from rivers is dissolved black carbon (DBC), a collection of polycondensed aromatic compounds derived from the incomplete combustion of biomass and fossil fuels. While DOC and DBC export are generally coupled, the effects of watershed land use on DBC quality are not well understood. In this study, DBC samples were collected throughout the Altamaha River watershed in Georgia, USA. DBC was characterized using the benzenepoly(carboxylic acid) method and Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS). DBC had a more polycondensed character in areas of the watershed with less anthropogenic disturbance. Furthermore, FTICR-MS revealed that DBC became enriched with a lower molecular weight, heteroatomic signature in response to higher anthropogenic activity. As global land cover continues to change, this study demonstrates on a localized scale that watershed land use can influence the export and composition of DBC, which may have further implications for global carbon and nutrient cycling.

中文翻译：

土地利用对亚热带流域溶解黑碳空间变异的控制

河流向沿海海洋出口大约250 Pg的溶解有机碳（DOC）。从河流出口的DOC可能是流域动态的反映，土地利用的变化可能导致河流DOC的分子组成和反应性发生变化。从河流出口的DOC中约有10％是溶解的黑碳（DBC），这是一种由生物质和化石燃料的不完全燃烧产生的缩聚芳族化合物。虽然DOC和DBC出口通常是耦合的，但人们对流域土地利用对DBC质量的影响知之甚少。在这项研究中，DBC样本是在美国佐治亚州的整个Altamaha河流域收集的。DBC的特征是使用苯聚羧酸法和傅立叶变换离子回旋共振质谱（FTICR-MS）。在流域区域，DBC具有更多的缩聚特征，而人为干扰较少。此外，FTICR-MS揭示了DBC在响应较高的人为活性时变得富含较低的分子量，杂原子特征。随着全球土地覆盖率的不断变化，这项研究在局部范围内证明了流域土地利用会影响DBC的出口和构成，这可能对全球碳和养分循环产生进一步的影响。

更新日期：2018-07-12

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