Altered Bacterial Communities in Long-Term No-Till Soils Associated with Stratification of Soluble Aluminum and Soil pH

被引:19
|
作者
Lewis, Ricky W. [1 ]
Barth, Victoria P. [2 ]
Coffey, Todd [3 ]
McFarland, Carol [1 ]
Huggins, David R. [4 ]
Sullivan, Tarah S. [1 ]
机构
[1] Washington State Univ, Dept Crop & Soil Sci, Pullman, WA 99164 USA
[2] USDA Farm Serv Agcy, Prosser, WA 99350 USA
[3] Washington State Univ, Ctr Interdisciplinary Stat Educ & Res, Pullman, WA 99164 USA
[4] USDA ARS, Northwest Sustainable Agroecosyst Res Unit, Pullman, WA 99164 USA
关键词
soil microbiome; no-till stratification; putative community function; arid soil acidification; ecosystem services; sugar beet lime; liquid lime; spatial scale;
D O I
10.3390/soils2010007
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Soil acidification is a global issue that often results in increased aluminum (Al) toxicity. While no-till (NT) management has many benefits regarding sustainability, a discrete zone of acidification often occurs when ammoniacal fertilizers are banded below the seed. The full agroecological consequences of NT stratification and impacts on bacterial communities are largely unknown. Using next-generation sequencing (NGS) and Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt), we characterized the influence of liming amendment and soil stratification on bacterial community composition and predicted function in 2-cm depth increments. Soil depth, pH, DTPA extractable aluminum (DTPA-Al), and KCl extractable Al (KCl-Al) were all significantly correlated with bacterial community structure and function. In soils with the lowest pH and greatest extractable Al, bacterial community was distinct, with highest relative abundance of the Koribacteraceae family, an indicator of soil degradation. Additionally, aspects of bacterial metabolism and nutrient turnover were impacted in the lowest pH zones, including secondary metabolite, carbohydrate, and energy metabolism. These results suggest that soil stratification (Al and pH) in NT systems has direct impacts on microbial community structure and function, potentially influencing ecosystem services at a highly resolved spatial scale within surface depths relevant to seed germination and emergence.
引用
收藏
页码:1 / 13
页数:13
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