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标题：Influence of land use on the chemical and physical characteristics of sediments from the Brazilian Savannah
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作者：Ramom Rachide Nunes ; Maria Olímpia Oliveira Rezende ; Peter Christiaan Speldewinde 等
期刊名称：Cogent Environmental Science
电子版ISSN：2331-1843
出版年度：2016
卷号：2
期号：1
页码：1218994
DOI：10.1080/23311843.2016.1218994
语种：English
出版社：Taylor and Francis Ltd
摘要：Abstract This study analyzed the chemical and physical characteristics of replicate sediment samples from water bodies distributed along a gradient of environmental degradation in an agricultural landscape. To assess the effect of agricultural land use (farming and livestock activity) in the Brazilian Savannah, the following sediment attributes were evaluated: pH, cation exchange capacity, organic matter (OM), total organic carbon, humic acids (HAs), and texture (granulometric analysis). In addition, the structure of the HAs was analyzed by infrared spectroscopy (FTIR), and the degree of OM transformation (dOMt) was determined by emission fluorescence. Compared with the ecological station (ES) (reference site), sediments from the livestock were highly altered, with a higher OM content (~100% difference) and a predominance of smaller size particles (35.00% clay and 45.20% silt). Samples with a higher OM content were related to a smaller dOMt; for example, the ES sediments contained 8.37% OM and had 37.07 dOMt, compared to 16.12% OM and a 25.98 dOMt in the livestock area sediments. In general, these findings provide detailed insight into how the conversion of a natural environment to an area of agricultural use (farming or livestock) amends the chemical and physical characteristics of its sediments.
关键词：sediment analysis ; agricultural land use ; modified landscape ; organic matter ; humic acids