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

Autor:	Silveira R; Cell Biology Department, Institute of Biology, University of Brasília, Brasília, DF 70910-900, Brazil., Mello TRB; Department of Ecology, Institute of Biology, University of Brasília, Brasília, DF 70910-900, Brazil., Sartori MRS; Department of Ecology, Institute of Biology, University of Brasília, Brasília, DF 70910-900, Brazil., Alves GSC; Cell Biology Department, Institute of Biology, University of Brasília, Brasília, DF 70910-900, Brazil., Fonseca FCA; Cell Biology Department, Institute of Biology, University of Brasília, Brasília, DF 70910-900, Brazil., Vizzotto CS; Cell Biology Department, Institute of Biology, University of Brasília, Brasília, DF 70910-900, Brazil., Krüger RH; Cell Biology Department, Institute of Biology, University of Brasília, Brasília, DF 70910-900, Brazil., Bustamante MMDC; Department of Ecology, Institute of Biology, University of Brasília, Brasília, DF 70910-900, Brazil.
Jazyk:	angličtina
Zdroj:	IScience [iScience] 2021 Mar 22; Vol. 24 (4), pp. 102349. Date of Electronic Publication: 2021 Mar 22 (Print Publication: 2021).
DOI:	10.1016/j.isci.2021.102349
Abstrakt:	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. Competing Interests: The authors declare no competing interests. (© 2021 The Authors.)
Databáze:	MEDLINE
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