Abstract:
Objective The Taihe County of Jiangxi Province was taken as the research area to reveal the spatial pattern of soil organic matter (SOM) content and its influencing mechanism at the county scale.
Method In this study, 361 surface (0-20 cm) soil samples were collected in Taihe County. Then the ordinary kriging, random forest and classical statistical methods were used to analyze the spatial pattern of SOM contents as well as to calculate the importance of different natural and anthropogenic factors on SOM variation.
Result The average SOM content in the study area was 31.05 g kg−1, which indicates a good fertile of farmland soil in Taihe County. The SOM content showed obvious spatial autocorrelation, which has the spatial distribution characteristics of low in the central region and high in the east and west. The main driving factors of SOM content in the study area were returning straw, and altitude with relative importance of 56.37% and 18.73%, respectively. The pH, parent materials, chemical fertilizer application and irrigation also clearly contributed to SOM, with relative importance of 9.66%, 9.47%, 6.76% and 5.45%, respectively.
Conclusion Reasonable soil management measures such as straw returning and good drainage conditions can effectively improve the soil organic matter content of cultivated land, as well as carbon sequestration ability, and thus contribute to promote the sustainable development of agriculture and achieving carbon peaking and carbon neutrality strategies.
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