Acid rain and nitrogen deposition in a sub-tropical watershed (Piracicaba): ecosystem consequences.
Acid rain and nitrogen deposition in a sub-tropical watershed (Piracicaba): ecosystem consequences.
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DOI：
10.1016/s0269-7491(02)00235-x
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发表时间：
2003-03
影响因子：
8.9
通讯作者：
A. Krusche;P. D. de Camargo;C. Cerri;M. Ballester;L. Lara;R. Victoria;L. Martinelli
中科院分区：
文献类型：
--
作者：
A. Krusche;P. D. de Camargo;C. Cerri;M. Ballester;L. Lara;R. Victoria;L. Martinelli
高水平的湿氮和酸性沉积在巴西东南部。在这项研究中，我们解决了水体和土壤酸化和氮沉积在皮拉西卡巴河流域（12,400平方公里）的敏感性。23个河流采样点的平均酸中和能力（ANC）从350到1800 μ eq l − 1不等。因此，如果假定200 μ eq l − 1的下限是缓冲性差的沃茨的指标，那么皮拉西卡巴流域的河流和溪流缓冲性良好。未经处理的废水排入该地区的河流和溪流，增加了ANC。平均NO3浓度在20 - 70 μ eq l − 1之间变化。在污染最严重的河流站点，NO3浓度不是最高的，然而，可能是由于NO3还原和反硝化。水流中的大部分氮也是由废水提供的，而不是由湿沉降提供的。然而，盆地中的大多数土壤是酸性的，碱性阳离子含量低，铝浓度高。因此，该盆地的土壤缓冲性差，在森林覆盖桑迪土壤的地区，酸化可能是一个问题。
High levels of wet N and acidic deposition were measured in southeast Brazil. In this study we addressed the sensitivity of water bodies and soils to acidification and N deposition in the Piracicaba River basin (12,400 km2). Average acid neutralization capacity (ANC) at 23 river sampling sites varied from 350 to 1800 μeq l−1. Therefore, rivers and streams in the Piracicaba basin are well buffered, if the lower limit of 200 μeq l−1is assumed as an indication of poorly buffered waters. ANC is increased by untreated wastewaters discarded into rivers and streams of the region. Average NO3concentrations varied from 20 to 70 μeq l−1. At the most polluted river sites, NO3concentration is not highest, however, probably due to NO3reduction and denitrification. Most of the nitrogen in streams is also provided by wastewaters and not by wet deposition. The majority of the soils in the basin, however, are acidic with a low base cation content and high aluminum concentration. Therefore, soils in this basin are poorly buffered and, in areas of forest over sandy soils, acidification may be a problem.