Microbial biomass measured as total lipid phosphate in soils of different organic content

To fill this knowledge gap, we examined how soil microbial community abundance and composition and function were associated with the edaphic and environmental factors from six oriental oak forest sites arranged across a 11° latitudinal gradient in East China

Å. Frostegård


Scholarcy highlights

  • The use of total lipid phosphate as a measure of biomass was evaluated in soils with different organic matter content
  • The ratio of fungi to bacteria decreased with increasing carboxyl C percentage; the lower abundance of arbuscular mycorrhizal fungi and decreased invertase activity in the southern sites were possibly related to higher ratio of alkyl to O alkyl; urease activity increased with carboxyl C percentage
  • phospholipid fatty acids profiles were more different among tillage types during the fallow period, but when PLFAs were assigned into functional groups the tillage effect was more evident after crop development, when conservation tillage promoted a higher abundance of soil fungi over bacteria
  • We examined 42 field plots and implemented multivariable linear regression analysis and structural equation modeling using 22 influencing variables related to plant, soil and microbial properties to quantify the controls of soil organic carbon and STN stocks
  • The results revealed that SOC and STN stocks significantly increased after cropland abandonment for 30 years, and there were minor decreases in C and N sequestrations in the early restoration stage
  • Stable isotope analysis was used to determine the incorporation of maize root and shoot litter C into soil organic C, extractable organic C, total microbial biomass, ergosterol and phospholipid fatty acids
  • The proportion of maize-derived C varied between the different pools with lower incorporation into the total soil organic carbon and total extractable organic C pools and higher incorporation ratios of maize C into phospholipid fatty acids of different microbial groups bacterial Phospholipid fatty acid-C, 44% in Gram-negative in the corn maize treatment in topsoil after five years

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