Journal
BIOLOGY AND FERTILITY OF SOILS
Volume 53, Issue 5, Pages 523-532Publisher
SPRINGER
DOI: 10.1007/s00374-017-1189-x
Keywords
Long-termfertilization; Particulate organic matter; Soil aggregation; Soil microbial community composition; Physical and chemical fractionation
Categories
Funding
- National Natural Science Foundation of China [31400460]
- Major Program of the National Natural Science Foundation of China [31420103917]
- Youth Innovation Research Team Project [LENOM2016Q0004]
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The effects of organic and mineral fertilization on four soil organic matter (SOM) fractions (non-protected, physically protected, chemically protected, and biochemically protected) and microbial community composition were investigated by sampling soil of a 35-year-long fertilization experiment. The SOM fractions were investigated by combined physical and chemical approaches, while microbial community composition was determined by phospholipid fatty acid analysis (PLFA). Organic C (SOC) was primarily distributed within the microaggregate-protected particulate organic matter (iPOM) and the hydrolysable and non-hydrolysable silt-sized (H-Silt, NH-Silt) fractions, which accounted for 11.6-16.9, 23.4-28.9, and 25.4-30.6% of the total SOC content, respectively. The contributions of these slow fractions (iPOM, H-Silt, NH-Silt) to the increased SOC were 178-293, 118-209, and 85-109% higher after long-term sole manure or manure in combination with inorganic N fertilization compared with unfertilized soil (control). The combination of manure and mineral fertilizers increased the coarse and fine non-protected C (cPOM and fPOM) contents much more (34.1-60.7%) than did manure alone. PLFAs, bacteria, G (+) bacteria, and actinomycete abundances were the highest in soil with manure, followed by soil treated with manure combined with mineral N. The addition of inorganic and organic fertilization both altered the microbial community composition compared with the control. All SOM fractions contributed to 81.1% of the variance of the PLFAs-related microbial community composition by direct and indirect effects. The change in coarse unprotected particulate organic matter (cPOM) was the major factor affecting soil microbial community composition (p < 0.001). Our study indicates that physical, chemical, and biochemical protection mechanisms are important in maintaining high SOC level after the addition of manure. A close linkage between soil microbial community composition and cPOM suggests that C availability is an important factor for influencing microbial composition after long-term inorganic and organic fertilization.
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