Watershed-scale liming reveals the short- and long-term effects of pH on the forest soil microbiome and carbon cycling

被引:10
|
作者
Sridhar, Bhavya [1 ]
Lawrence, Gregory B. [2 ]
Debenport, Spencer J. [3 ]
Fahey, Timothy J. [4 ]
Buckley, Daniel H. [3 ]
Wilhelm, Roland C. [3 ]
Goodale, Christine L. [1 ]
机构
[1] Cornell Univ, Dept Ecol & Evolutionary Biol, Ithaca, NY USA
[2] US Geol Survey, Troy, NY USA
[3] Cornell Univ, Sch Integrat Plant Sci, Bradfield Hall, Ithaca, NY 14853 USA
[4] Cornell Univ, Dept Nat Resources, Fernow Hall, Ithaca, NY 14853 USA
关键词
R PACKAGE; RHIZOBIUM-LEGUMINOSARUM; BACTERIAL COMMUNITIES; FUNGAL COMMUNITIES; CALCIUM; NITROGEN; DIVERSITY; GROWTH; IDENTIFICATION; ANNOTATION;
D O I
10.1111/1462-2920.16119
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Soil microbial community composition routinely correlates with pH, reflecting both direct pH effects on microbial physiology and long-term biogeochemical feedbacks. We used two watershed-scale liming experiments to identify short- (2 years) and long-term (25 years) changes in the structure and function of bacterial and fungal communities in organic horizons (O-e and O-a) of acid forest soils. Liming increased soil pH, extractable calcium, and soil carbon stocks, reduced biomass-specific respiration, and caused major changes in the soil microbiome in the short and long term. More taxa responded to liming in the short term (70%) than in the long term (30%), with most showing consistent directional responses at both sites. The ratio of change in relative abundance between limed and reference sites was twofold higher at the long than the short-term site, indicating that the effects of liming grew over time. Liming impacts were most pronounced in fungi, as steep declines of dominant ectomycorrhizal fungi (Cenococcum and Russula) occurred at both sites. Liming favoured neutrophilic bacteria over acidophilic populations according to estimated environmental pH optima. Collectively, these results demonstrate that a liming-induced change of one pH unit has an immediate and persistent effect on the structure and function of microbial communities in acid forest soils. The corresponding suppression of respiration indicates that anthropogenic alterations of soil pH, as driven by acid deposition or liming, can affect forest floor C stocks due to pH-driven shifts in community structure.
引用
收藏
页码:6184 / 6199
页数:16
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