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Composition of particulate and dissolved organic matter in a disturbed watershed of southeast Brazil (Piracicaba River basin)

机译：巴西东南部受干扰流域（piracicaba河流域）颗粒物和溶解有机物的组成

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The elemental and isotopic composition of particulate and dissolved organic matter was investigated in the Piracicaba River basin, Sao Paulo State, Brazil. Comparison of riverine organic matter from the Piracicaba River basin, a region where rivers and streams receive urban sewage and industrial effluents, with data reported for the pristine Amazon system revealed significant differences associated with anthropogenic impacts. One important difference was N enrichment in the particulate organic material of the Piracicaba basin rivers, due to (a) urban and industrial effluents, and (b) enhanced phytoplankton growth, which results from the combination of nutrient enrichment and damming of sections of the rivers. Radiocarbon concentrations were overall more depleted (older C-14 age) in the Piracicaba basin rivers than in the Amazon, which may reflect the importance of soil erosion in the former. Analyses of stable and radioactive carbon isotopes and lignin-derived compounds indicated that coarse particulate organic material is composed of a mixture of soil particles and degraded organic matter from C3 and C4 vascular plants. Fine particulate organic material was composed mainly of soil particles and phytoplankton cell remains, the latter especially during low water, Ultrafiltered dissolved organic matter was the most degraded fraction according to its lignin oxidation products, and showed the greatest influence of C4 plant sources. (C) 2002 Elsevier Science Ltd. All rights reserved.
机译：在巴西圣保罗州的皮拉西卡巴河流域，研究了颗粒和溶解有机物的元素和同位素组成。皮拉西卡巴河流域（河流和溪流接收城市污水和工业废水的地区）的河流有机物与原始亚马逊系统报告的数据进行了比较，发现与人为影响相关。一个重要的区别是皮拉西卡巴盆地河流中的颗粒有机物质中的氮富集，这是由于（a）城市和工业废水，以及（b）浮游植物生长的增加，这是由于营养富集和河段堰塞相结合而产生的。 。相比于亚马逊河，Piracicaba流域河流中的放射性碳浓度总体上更耗竭（C-14年龄较大），这可能反映了前者土壤侵蚀的重要性。对稳定和放射性碳同位素和木质素衍生化合物的分析表明，粗颗粒有机物是由土壤颗粒和C3和C4维管植物降解的有机物组成的混合物。细颗粒有机物主要由土壤颗粒和浮游植物细胞残余物组成，后者尤其是在低水时，根据木质素氧化产物，超滤后的溶解有机物降解程度最高，对C4植物来源的影响最大。 （C）2002 Elsevier Science Ltd.保留所有权利。

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