Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 27, Issue 28, Pages 34941-34950Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-09720-1
Keywords
Inorganic nitrogen; Mangrove soils; Soil pollution
Categories
Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [446457/2014-0, 305996/2018-5, 409593/2018-4]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brasil (CAPES) [001]
- Fundacao Cearense de Apoio ao Desenvolvimento Cientifico e Tecnologico (FUNCAP) [15/2013]
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro [E-26/202.757/2019]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo-FAPESP [2018/04259-2, 2019/02855-0]
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Nitrogen (N) inputs originated from shrimp farming effluents were evaluated for potential changes in the net N mineralization for mangrove soils from Northeastern Brazil. Our study provides notable information and assessment for the potential enhancement of N mineralization in preserved and shrimp-impacted semi-arid mangrove soils of the Jaguaribe River estuary, which is one of the largest shrimp producers of Brazil, using an analytical and daily tidal variation experimental approach. Nitrogen-rich effluents promoted a significant (pvalue < 0.001) increase of the total soil N content (1998 +/- 201 mg kg(-1)on average) compared with the preserved sites (average: 1446 +/- 295 mg kg(-1)). The effluents also increased the N mineralization in the shrimp-impacted sites (N-min: 86.6 +/- 37.5 mg kg(-1)), when compared with preserved mangroves (N-min: 56.5 +/- 23.8 mg kg(-1)). Over a daily tidal variation experiment, we found that just 30% (36.2 +/- 20.6 mg kg(-1)) of mineralized N remains stored in the soil, whereas 70% (102.9 +/- 38.8 mg kg(-1)) was solubilized in tidal waters. Therefore, the N mineralization process may trigger eutrophication by increasing N inorganic bioavailability in mangrove soils receiving N-rich effluents from shrimp ponds, which in turn might increase primary producers' activity. This approach has not been studied so far in semi-arid mangroves, where the shrimp farming activity is one of the most important economic activities.
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