Impact of surface soil manuring on particulate carbon fractions in relevant to nutrient stoichiometry in a Mollisol profile

摘要: Abstract Organic matter application significantly influences soil carbon storage and sequestration in cropland. The investigation of C through organic (SOC) fractions the profile its relation to nutrient stoichiometry are essential for evaluating effect farming practice on fertility. This study aimed examine cattle manure stoichiometry, which would be associated with stock SOC fractions, such as microbial biomass (MBC), dissolved (DOC) water-soluble (WSOC), coarse particulate (cPOC), fine (fPOC) mineral-associated (MOC). A four-year experiment was conducted a Mollisol, fertilization treatments comprised (1) NoF: non-fertilizer control, (2) F: synthetic fertilizer, i.e. 20.3, 21.2 12.2 kg ha−1 nitrogen (N), phosphorus (P) potassium (K) soybean, 69.0, 28.1 6.1 N, P K corn an annual basis, respectively, (3) F + M: fertilizer plus 15 Mg ha-1 (4) 2M: 30 soybean-corn rotation. concentration top 10 cm 18 % 19 higher under M than that NoF F, respectively. Whereas, F+2 increased by 32 %, 14 11 0−10, 10−20, 20−30, 30−40 depth compared respective NoF. Compared (F M) MBC DOC 20 depth, but decreased WSOC depth. cPOC F. fPOC 50 NoF, further M. There no difference among MOC any were significant exponential correlations POC N/P ratio. These results indicate combination accumulation fraction especially change responsible matter, highlighting rather mainly regulated POC. Increasing input N combined benefit formation agricultural Mollisols.