Soil Fungal:Bacterial Ratios Are Linked to Altered Carbon Cycling

被引:302
作者
Malik, Ashish A. [1 ,2 ]
Chowdhury, Somak [1 ]
Schlager, Veronika [1 ]
Oliver, Anna [2 ]
Puissant, Jeremy [2 ]
Vazquez, Perla G. M. [1 ]
Jehmlich, Nico [3 ]
von Bergen, Martin [3 ,4 ,5 ,6 ]
Griffiths, Robert I. [2 ]
Gleixner, Gerd [1 ]
机构
[1] Max Planck Inst Biogeochem, Dept Biogeochem Proc, Jena, Germany
[2] Ctr Ecol & Hydrol, Wallingford, Oxon, England
[3] Helmholtz Ctr Environm Res, Dept Prote, Leipzig, Germany
[4] Helmholtz Ctr Environm Res, Dept Metabol, Leipzig, Germany
[5] Univ Leipzig, Inst Biochem, Fac Biosci Pharm & Psychol, Leipzig, Germany
[6] Aalborg Univ, Dept Chem & Life Sci, Aalborg, Denmark
关键词
bacteria; fungi; litter decomposition; proteomics; RNA sequencing; soil carbon; stable isotopes; ORGANIC-MATTER; TEMPERATURE SENSITIVITY; LITTER DECOMPOSITION; MICROBIAL BIOMASS; BACTERIAL; FUNGAL; EXTRACTION; TURNOVER; TRANSFORMATIONS; STOICHIOMETRY;
D O I
10.3389/fmicb.2016.01247
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Despite several lines of observational evidence, there is a lack of consensus on whether higher fungal:bacterial (F:B) ratios directly cause higher soil carbon (C) storage. We employed RNA sequencing, protein profiling and isotope tracer techniques to evaluate whether differing F:B ratios are associated with differences in C storage. A mesocosm 13C labeled foliar litter decomposition experiment was performed in two soils that were similar in their physico-chemical properties but differed in microbial community structure, specifically their F:B ratio (determined by PLFA analyses, RNA sequencing and protein profiling; all three corroborating each other). Following litter addition, we observed a consistent increase in abundance of fungal phyla; and greater increases in the fungal dominated soil; implicating the role of fungi in litter decomposition. Litter derived 13C in respired CO2 was consistently lower, and residual C-13 in bulk SOM was higher in high F:B soil demonstrating greater C storage potential in the F:B dominated soil. We conclude that in this soil system, the increased abundance of fungi in both soils and the altered C cycling patterns in the F:B dominated soils highlight the significant role of fungi in litter decomposition and indicate that F:B ratios are linked to higher C storage potential.
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页数:11
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