Abstract
There is increasing evidence that microorganisms participate in soil C sequestration and stabilization in the form of resistant microbial residues. The type of fertilizers influences microbial activity and community composition; however, little is known about its effect on the microbial residues and their relative contribution to soil C storage. The aim of this study was to investigate the long-term impact (21 years) of different fertilizer treatments (chemical fertilizer, crop straw, and organic manure) on microbial residues in a silty clay loam soil (Udolls, USDA Soil Taxonomy). Amino sugars were used to indicate the presence and origin of microbial residues. The five treatments were: CK, unfertilized control; NPK, chemical fertilizer NPK; NPKS1, NPK plus crop straw; NPKS2, NPK plus double amounts of straw; and NPKM, NPK plus pig manure. Long-term application of inorganic fertilizers and organic amendments increased the total amino sugar concentrations (4.4–8.4 %) as compared with the control; and this effect was more evident in the plots that continuously received pig manure (P < 0.05). The increase in total amino sugar stock was less pronounced in the straw-treated plots than the NPKM. These results indicate that the accumulation of soil amino sugars is largely influenced by the type of organic fertilizers entering the soil. Individual amino sugar enrichment in soil organic carbon was differentially influenced by the various fertilizer treatments, with a preferential accumulation of bacterial-derived amino sugars compared with fungal-derived glucosamine in manured soil.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (41101282) and the National Basic Research Program of China (2011CB100506-01). We are deeply grateful to the editor and two anonymous reviewers for their insightful and valuable comments for the manuscript.
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Ding, X., Han, X. & Zhang, X. Long-term impacts of manure, straw, and fertilizer on amino sugars in a silty clay loam soil under temperate conditions. Biol Fertil Soils 49, 949–954 (2013). https://doi.org/10.1007/s00374-012-0768-0
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DOI: https://doi.org/10.1007/s00374-012-0768-0