Phosphorus in soils and fluvial sediments from a Cerrado biome watershed under agricultural expansion.

Autor: Rimá FB; Federal Institute of Maranhão (IFMA), Codó, MA, 65400-000, Brazil., da Silva YJAB; Agronomy Department, Federal University of Piaui (UFPI), Planalto Horizonte, Bom Jesus, PI, 64900-000, Brazil. yurijacques@ufpi.edu.br., Teixeira MPR; Agronomy Department, Federal University of Piaui (UFPI), Planalto Horizonte, Bom Jesus, PI, 64900-000, Brazil., Maia AJ; Agronomy Department, Federal Rural University of Pernambuco (UFRPE), Dom Manuel de Medeiros Street, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil., Assis KGO; Agronomy Department, Federal University of Piaui (UFPI), Planalto Horizonte, Bom Jesus, PI, 64900-000, Brazil., da Silva RJAB; Agronomy Department, Federal Rural University of Pernambuco (UFRPE), Dom Manuel de Medeiros Street, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil., de Souza Júnior VS; Agronomy Department, Federal Rural University of Pernambuco (UFRPE), Dom Manuel de Medeiros Street, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil., da Silva YJAB; Agronomy Department, Federal Rural University of Pernambuco (UFRPE), Dom Manuel de Medeiros Street, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil., Lopes JWB; Agronomy Department, Federal University of Piaui (UFPI), Planalto Horizonte, Bom Jesus, PI, 64900-000, Brazil., Barbosa RS; Agronomy Department, Federal University of Piaui (UFPI), Planalto Horizonte, Bom Jesus, PI, 64900-000, Brazil., Singh VP; Biological and Agricultural Engineering Department, Zachry, Department of Civil Engineering, Texas A&M University, College Station, TX, 77843-2117, USA.; National Water & Energy Center, UAE University, Al Ain, UAE.
Jazyk: angličtina
Zdroj: Environmental monitoring and assessment [Environ Monit Assess] 2022 Apr 21; Vol. 194 (5), pp. 388. Date of Electronic Publication: 2022 Apr 21.
DOI: 10.1007/s10661-022-09983-w
Abstrakt: Over the past decades, lands alongside Gurguéia River have witnessed rapid expansion of soybean agriculture which has increased soil degradation and affected nutrient concentration in sediment, especially phosphorus (P). The present study aimed to quantify the P concentration in soils under different land uses (i.e., croplands, grasslands, and cerrado) and fluvial sediments (suspended sediment, channel bank, and riverbed sediments), assessing pollution over the main watercourse in cerrado biome Gurguéia watershed, located in Piauí State, Brazil. In total, 136 composite soil samples at a depth of 0-5 cm, under different land uses, as well as 51 composite fluvial sediment samples were collected over the watershed. The land use change from native cerrado had resulted in an increase of total phosphorus (TP) whose concentration was higher in cropland areas, followed by suspended sediment, channel bank, and riverbed sediments. This high concentration in cropland areas resulted from phosphate fertilizer inputs. The transfer of phosphorus to water bodies was evidenced, since an increase of TP was observed in suspended sediment, channel bank and riverbed  sediments. Mineralogical signatures in sediments were identified by X-ray diffraction analysis which showed the occurrence of kaolinite, illite, smectite, iron oxides, and other minerals in lesser proportions. The presence of 1:1 minerals was higher in riverbed sediments and downstream sampling points, while 2:1 minerals were present in higher proportions in suspended sediment and channel bank sediment, as well as at the upstream and middle sampling points. This finding shows that land use change from cerrado to cropland due to soybean agriculture expansion might increase P discharges from terrestrial to aquatic environments, with sediments being the major carrier of this element.
(© 2022. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)
Databáze: MEDLINE
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