land Article Cultivated Land Use Zoning Based on Soil Function Evaluation from the Perspective of Black Soil Protection Rui Zhao 1,†, Junying Li 2,†, Kening Wu 1,3,4,* and Long Kang 1 1 School of Land Science and Technology, China University of Geosciences, Beijing 100083, China; zhaoruifi
[email protected] (R.Z.);
[email protected] (L.K.) 2 College of Resources and Environment, Shandong Agricultural University, Taian 271018, China;
[email protected] 3 Key Laboratory of Land Consolidation and Rehabilitation, Ministry of Natural Resources, Beijing 100035, China 4 Technology Innovation Center of Land Engineering, Ministry of Natural Resources, Beijing 100083, China * Correspondence:
[email protected] † These authors contributed equally to this work. Abstract: Given that cultivated land serves as a strategic resource to ensure national food security, blind emphasis on improvement of food production capacity can lead to soil overutilization and impair other soil functions. Therefore, we took Heilongjiang province as an example to conduct a multi-functional evaluation of soil at the provincial scale. A combination of soil, climate, topography, land use, and remote sensing data were used to evaluate the functions of primary productivity, provi- sion and cycling of nutrients, provision of functional and intrinsic biodiversity, water purification and regulation, and carbon sequestration and regulation of cultivated land in 2018. We designed a soil function discriminant matrix, constructed the supply-demand ratio, and evaluated the current status of supply and demand of soil functions. Soil functions demonstrated a distribution pattern Citation: Zhao, R.; Li, J.; Wu, K.; of high grade in the northeast and low grade in the southwest, mostly in second-level areas.