Ammonia-oxidizing bacterial communities are affected by nitrogen fertilization and grass species in native C 4 grassland soils

PeerJ

article

Jialin Hu¹  Jonathan D. Richwine²  Patrick D. Keyser²  Lidong Li³  Fei Yao¹  Sindhu Jagadamma¹  Jennifer M. DeBruyn¹ 

[1] Department of Biosystems Engineering and Soil Science, University of Tennessee;Department of Forestry, Wildlife and Fisheries, University of Tennessee;Agroecosystem Management Research Unit, USDA-Agricultural Research Service, Lincoln

关键词: N fertilizer;    Switchgrass;    Big bluestem grass;    Ammonia oxidizing bacteria;    amoA;    Soil microbiology;   

DOI  :  10.7717/peerj.12592

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

BackgroundFertilizer addition can contribute to nitrogen (N) losses from soil by affecting microbial populations responsible for nitrification. However, the effects of N fertilization on ammonia oxidizing bacteria under C4 perennial grasses in nutrient-poor grasslands are not well studied.MethodsIn this study, a field experiment was used to assess the effects of N fertilization rate (0, 67, and 202 kg N ha−1) and grass species (switchgrass (Panicum virgatum) and big bluestem (Andropogon gerardii)) on ammonia-oxidizing bacterial (AOB) communities in C4 grassland soils using quantitative PCR, quantitative reverse transcription-PCR, and high-throughput amplicon sequencing of amoA genes.ResultsNitrosospira were dominant AOB in the C4 grassland soil throughout the growing season. N fertilization rate had a stronger influence on AOB community composition than C4 grass species. Elevated N fertilizer application increased the abundance, activity, and alpha-diversity of AOB communities as well as nitrification potential, nitrous oxide (N2O) emission and soil acidity. The abundance and species richness of AOB were higher under switchgrass compared to big bluestem. Soil pH, nitrate, nitrification potential, and N2O emission were significantly related to the variability in AOB community structures (p < 0.05).

【 授权许可】

CC BY