NDLI: The Response of Critical Microbial Taxa to Litter Micro-Nutrients and Macro-Chemistry Determined the Agricultural Soil Priming Intensity After Afforestation

Content Provider	Directory of Open Access Journals (DOAJ)
Author	Shaokun Wang Jin Zhan Zhiying Ning Dan Han Hongling Yang Yulin Li
Abstract	Afforestation with trees and shrubs around cropland can effectively decrease soil degradation and avoid sand storms, but subsequent modification of litter quality accelerates the degradation of native organic matter via the soil priming effect (PE). Although carbon accumulation in agricultural soils after afforestation was widely studied, little is known about the extent to which soil organic carbon (SOC) mineralization is induced by complex residue input in agro-forest-grass composite ecosystems. Here, we mixed corn field soil and litter of afforestation tree and shrub species together in a micro-environment to quantify the effects of litter-mixture input on farmland soil priming associated with afforestation. Additionally, we studied the responses of bacterial and fungal species to litter chemistry, with the aim to identify the litter and microbial driver of soil priming. The results showed that soil priming was accelerated by different litter addition which varied from 24 to 74% of SOC mineralization, suggesting that priming intensity was relatively flexible and highly affected by litter quality. We also find that the macro-chemistry (including litter carbon, nitrogen, lignin, and cellulose) directly affects priming intensity, while micro-chemistry (including litter soluble sugar, water-soluble phenol, methanol-soluble phenol, and condensed tannin) indirectly influences priming via alteration to dominant bacterial taxa. The stepwise regression analysis suggested that litter nitrogen and cellulose were the critical litter drivers to soil priming (r2 = 0.279), and the combination of bacterial phylum Proteobacteria, Firmicutes, Bacteroidetes, Acidobacteria, and fungal taxa Eurotiomycetes was a great model to explain the priming intensity (r2 = 0.407).
e-ISSN	1664302X
DOI	10.3389/fmicb.2021.730117
Journal	Frontiers in Microbiology
Volume Number	12
Language	English
Publisher	Frontiers Media S.A.
Publisher Date	2021-09-01
Publisher Place	Switzerland
Access Restriction	Open
Subject Keyword	Microbiology Afforestation Agro-forest-grass Composite Ecosystem Soil Priming Effect Litter Chemical Traits Critical Microbial Taxa Macro-chemistry
Content Type	Text
Resource Type	Article

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