Purpose The main objective of this study was to understand the spatial characteristics of the ecological stoichiometry of carbon (C), nitrogen (N), and phosphorous (P) and their driving factors in farmland soils. Materials and methods Data were obtained from 7223 sampling sites of farmland topsoil (0–20 cm) collected by the soil testing and formulated fertilization project in 2012. Soil organic C was determined by potassium dichromate (K Cr O ) oxidation with 2 2 7 heating in an oil bath. Total N was analyzed using an automatic Kjeldahl nitrogen analyzer. Total P was determined using HClO – H SO digestion followed by a Mo–Sb colorimetric assay. 2 4 Results and discussion The mean soil C/N, C/P, and N/P ratios were 11.76, 38.06, and 3.37, respectively and showed moderate variations. The spatial autocorrelation distances were larger for C/N and smaller for C/P and N/P. The nugget/sill ratios for soil C/ N, C/P, and N/P were 79.43, 52.09, and 55.73%, respectively. Soil C/P and N/P ratios showed a similar spatial distribution with high heterogeneity, whereas the C/N ratio distribution was relatively smooth. Both C/N and N/P ratios were driven by N application rate, but the C/P ratio was more influenced by
Journal of Soils and Sediments – Springer Journals
Published: Jun 1, 2018
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