Seasonal and long-term effects of nutrient additions and liming on the nifH gene in cerrado soils under native vegetation
| Autor: | Carla Simone Vizzotto, Mercedes M. C. Bustamante, Thiago de Roure Bandeira de Mello, Fernando Campos de Assis Fonseca, Ricardo Henrique Krüger, Maria Regina Silveira Sartori, Gabriel Sergio Costa Alves, Rafaella Silveira |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Science chemistry.chemical_element 02 engineering and technology Bradyrhizobium Microbiology Article 03 medical and health sciences Nutrient Dry season Relative species abundance Multidisciplinary biology Phosphorus Plant Ecology Global Nutrient Cycle biochemical phenomena metabolism and nutrition 021001 nanoscience & nanotechnology biology.organism_classification Plant ecology 030104 developmental biology Agronomy chemistry Nitrogen fixation Diazotroph 0210 nano-technology |
| Zdroj: | iScience iScience, Vol 24, Iss 4, Pp 102349-(2021) |
| ISSN: | 2589-0042 |
| Popis: | Summary Biological nitrogen fixation (BNF) represents the main input source of N in tropical savannas. BNF could be particularly important for Brazilian savannas (known as Cerrado) that show a highly conservative N cycle. We evaluated the effects of seasonal precipitation and nutrient additions on the nifH gene abundance in soils from a long-term fertilization experiment in a Cerrado's native area. The experiment consists of five treatments: (1) control, (2) liming, (3) nitrogen (N), (4) nitrogen + phosphorus (NP), and (5) phosphorus (P) additions. The nifH gene sequence was related to Bradyrhizobium members. Seasonal effects on N-fixing potential were observed by a decrease in the nifH relative abundance from rainy to dry season in control, N, and NP treatments. A significant reduction in nifH abundance was found in the liming treatment in both seasons. The findings evidenced the multiple factors controlling the potential N-fixing by free-living diazotrophs in these nutrient-limited and seasonally dry ecosystems. Graphical abstract Highlights • First assessment of nutrient addition effects on nifH gene abundance in Cerrado soils • Increases in soil pH and nutrient contents negatively affected nifH gene abundance • nifH gene relative abundance was positively affected by precipitation's seasonality • Reduction in potential BNF suggests that eutrophication can induce long-term changes Microbiology; Plant Ecology; Global Nutrient Cycle |
| Databáze: | OpenAIRE |
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