Spatial distribution characteristics of organic matter and pH in cultivated land in Wudalianchi City and their interrelationships

The spatial distribution of soil organic matter and pH is an important aspect of soil fertility management. The spatial distribution of organic matter and pH and their correlation were studied in 458 arable land soil samples in Beian City, Heilongjiang Province, using Arcgis technology and relevant statistical analysis methods. The results showed that the average value of organic matter in the study area was 58.01 g/kg, with a high overall content and relatively uniform distribution. The average pH value of the arable land was 5.72, which was weakly acidic in general, acidic in the west and some parts of the centre, and softly acidic in the east. There was a significant positive correlation between organic matter and pH of arable land in Wudalianchi City, which was different from some scholars’ opinions, indicating that these two factors were also influenced by other variables. Therefore, when evaluating arable land resources in different regions, coupling and correlation analyses between multiple factors must be considered.