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Seasonal and long-term effects of nutrient additions and liming on the nifH gene in cerrado soils under native vegetation

2021; Cell Press; Volume: 24; Issue: 4 Linguagem: Inglês

10.1016/j.isci.2021.102349

2589-0042

Rafaella Silveira, Thiago de Roure Bandeira de Mello, M. R. Sartori, Gabriel Sérgio Costa Alves, Fernando Fonseca, Carla Simone Vizzotto, Ricardo Henrique Krüger, Mercedes Bustamante,

Legume Nitrogen Fixing Symbiosis

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.