Analysis of intra-seasonal dynamics of organic carbon content in arable sod-podzolic soil

The ongoing work on forecasting changes in soil carbon reserves using various mathematical models requires primary data for different points in time. The paper examines archival results of observations of intra-seasonal carbon dynamics obtained in 1983 on arable sod-podzolic soils in Educational and Experimental Soil and Ecological Center of Lomonosov Moscow State University "Chashnikovo". Measurements were carried out from June to September on 30×30 m plots located in three crop rotation fields. Samples were taken from layers 0‒10 and 10‒20 of the arable horizon. The number of measurements in each period on each field was 25. After preliminary rejection of the results that did not meet the hypothesis of homogeneity of the soil horizon, the data were processed by ANOVA. It is shown that in the arable horizon (0–20 cm layer) the range of intra-seasonal variability of carbon content can be about 0.10%. Minimum values of carbon content were observed in August-September.