A Quantitative Analysis of Factors Influencing Organic Matter Concentration in the Topsoil of Black Soil in Northeast China Based on Spatial Heterogeneous Patterns

Black soil is fertile, abundant with organic matter (OM) and exceptional for farming. The black zone in northeast China the third-largest globally produces a quarter of China’s commodity grain. However, (SOM) this declining, quality cultivated land falling off rapidly due to overexploitation unsustainable management practices. To help develop an integrated protection strategy soil, study aimed identify primary factors contributing SOM degradation. geographic detector, which can detect both linear nonlinear relationships interactions based on spatial heterogeneous patterns, was used quantitatively analyze natural anthropogenic affecting concentration China. In descending order, nine are temperature, gross domestic product (GDP), elevation, population, type, precipitation, erosion, use, geomorphology. influence all significant, interaction any two enhances their impact. decreases increased elevation terrain undulation. rises initially increasing GDP but then increases, varies by type use. Conclusions about detailed impacts presented paper. For example, wind erosion has more significant effect than water irrigated lower content dry land. Based results, measures, including conservation tillage, farmland shelterbelts, cross-slope ridges, terraces, rainfed farming recommended. conversion high-quality non-farm uses should be prohibited.