期刊
ISCIENCE
卷 24, 期 4, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.isci.2021.102349
关键词
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资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) through the Programa de Pesquisas Ecologicas de Longa Duracao (PELD)
- Fundacao de Apoio a Pesquisa do Distrito Federal (FAPDF)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
The study in Brazilian savannas found that seasonal precipitation and nutrient additions significantly influenced the potential nitrogen fixation by free-living diazotrophs, indicating multiple factors control the process in these nutrient-limited and seasonally dry ecosystems.
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.
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