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

被引：14

作者：

Silveira, Rafaella ^{[1
]}

Bandeira de Mello, Thiago de Roure ^{[2
]}

Silveira Sartori, Maria Regina ^{[2
]}

Costa Alves, Gabriel Sergio ^{[1
]}

de Assis Fonseca, Fernando Campos ^{[1
]}

Vizzotto, Carla Simone ^{[1
]}

Kruger, Ricardo Henrique ^{[1
]}

da Cunha Bustamante, Mercedes Maria ^{[2
]}

机构：

[1] Univ Brasilia, Inst Biol, Cell Biol Dept, BR-70910900 Brasilia, DF, Brazil

[2] Univ Brasilia, Inst Biol, Dept Ecol, BR-70910900 Brasilia, DF, Brazil

来源：

ISCIENCE | 2021年 / 24卷 / 04期

关键词：

NITROGEN-FIXATION; COMMUNITY STRUCTURE; BRAZILIAN SAVANNA; DIVERSITY; BIODIVERSITY; PATTERNS; ABUNDANCE; BACTERIA; REGION; FIRE;

D O I：

10.1016/j.isci.2021.102349

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：20