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首页> 外文期刊>Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society >Plant wax integration and transport from the Mississippi River Basin to the Gulf of Mexico inferred from GIS-enabled isoscapes and mixing models
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Plant wax integration and transport from the Mississippi River Basin to the Gulf of Mexico inferred from GIS-enabled isoscapes and mixing models

机译：从密西西比河流域到墨西哥湾推断出从启用GIS的体态和混合模型的植物蜡集成和运输

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Understanding the fate of terrestrial plant waxes from source to sink is critical for improving paleoclimate interpretations from sedimentary plant waxes. However, there is limited knowledge about the controls on plant wax integration and transport in large catchments with multiple biomes and climates. To address this lack of understanding, we investigated the vegetation and climatic controls on plant wax integration and transport from the Mississippi River Basin (MRB), the largest river in the U.S., to the Gulf of Mexico (GOM). We first estimated the geographic distribution of n-alkane carbon (delta C-13(alk)) and hydrogen (delta H-2(alk)) isotopic compositions (i.e. isoscapes) in the MRB using plant isotope fractionation calibrations from North America and similar climate regions for the pre-industrial. We utilized two different vegetation maps (i.e. biome map and %C-4 map) and two plant isotope fractionation estimation approaches, and discussed advantages and disadvantages of each method. Then, we developed mixing models weighting the isotope values by biological and climatic parameters (i.e. vegetation area, n-alkane concentration by chain lengths, net primary productivity (NPP), and runoff) and their combinations to test the sensitivity of basin-integrated plant wax isotopic compositions to these variables. Our approach does not factor in soil stocks of plant wax nor degradation in transit, as future work will need to constrain these factors for the MRB for the period of interest. Vegetation area weighting alone predicted relatively high C-4 plant contributions to the pool of waxes exported from the basin. When n-alkane concentration in leaves, NPP, or runoff was considered, the contribution of forest-derived plant waxes increased. Sensitivity of plant wax isotopic compositions to productivity and transport efficiency varied among models and chain lengths. For example, n-C-29 alkanes were sensitive to plant wax contribution increases from forests whereas n-C-33
机译：了解从源头到汇的地面植物蜡的命运对于改善沉积植物蜡的古古怪解释至关重要。然而，关于植物蜡集成和在大型流域的运输的控制有有限的知识，具有多种生物群系和气候。为了解决这一缺乏理解，我们调查了植物蜡融资和超市植物的植被和气候管制，密西西比河流域（MRB）是美国最大的河流（MRB），墨西哥湾（GOM）。我们首先使用来自北美的植物同位素分级校准和类似的植物同位素分级校准估计N-烷烃碳（Delta C-13（Alk））和氢气（即甲磺酸））同位素组合物（即等型）的地理分布预工业的气候区。我们使用了两种不同的植被图（即生物群系图和％C-4地图）和两种植物同位素分级估计方法，并讨论了每种方法的优缺点。然后，我们开发了通过生物和气候参数（即植被面积，通过链长，净初级生产率（NPP）和径流）的生物和气候参数（即N-烷烃浓度，净级生产率（NPP）和径流）的混合模型及其用于测试盆地综合植物敏感性的组合这些变量的蜡同位素组合物。我们的方法不考虑植物蜡的土壤股，也不是运输中的劣化，因为未来的工作需要限制MRB的这些因素，以便在兴趣期内。单独植被面积加权预测对从盆地出口的蜡库的相对高的C-4厂贡献。当考虑叶片中的N-烷烃或径流时，森林衍生的植物蜡的贡献增加。植物蜡同位素组合物在生产率和运输效率方面的敏感性在模型和链长之间变化。例如，N-C-29烷烃对植物蜡贡献敏感，从森林增加，而N-C-33

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