JOURNAL OF NATURAL RESOURCES ›› 2022, Vol. 37 ›› Issue (9): 2231-2246.doi: 10.31497/zrzyxb.20220903

• Special Issue of "Exploitation and Utilization of of Black Soil Resource" • Previous Articles     Next Articles

Spatial reconstruction of farmland rotation and fallow in the typical black soil region of Northeast China

SONG Ge1,2(), ZHANG Hong-mei3()   

  1. 1. School of Humanities and Law, Northeast University, Shenyang 110169, China
    2. Key Laboratory of Land Protection and Use, Department of Natural Resources of Liaoning Province, Shenyang 110169, China
    3. School of Public Management, Liaoning University, Shenyang 110136, China
  • Received:2021-10-25 Revised:2022-03-23 Online:2022-09-28 Published:2022-12-28
  • Contact: ZHANG Hong-mei E-mail:songgelaoshi@163.com;18640553575@163.com

Abstract:

Rotation and fallow are important means to ensure the sustainable utilization of cultivated land resources in black soil regions. Determining the scale and spatial distribution of cultivated land for crop rotation and fallow scientifically is of great significance for undertaking land reclamation, improving soil fertility, and balancing the structure of food supply and demand in the black soil regions. Taking the typical black soil regions in Northeast China: Keshan county, Baiquan county, and Yi'an county as the research area, this paper reconstructs the farmland rotation and fallow layout at the plot scale by using the crop planting suitability evaluation model, multi-objective optimization (MOP) model, and agent-based land layout optimization allocation (AgentLA) model. Findings show that: (1) There are obvious spatial differences between high-value and low-value areas of the planting suitability of main crops. The high-value areas of corn and soybean planting suitability intersect in the north of Yi'an and the west of Keshan, which are the dominant areas of corn-soybean rotation. And the low-value areas converge in the south of Yi'an and the southwest of Baiquan, which are the key areas for fallow farming. (2) The crop rotation scale based on the optimization of the planting structure has achieved an increase in the proportion of soybean planting and a decrease in corn planting, alleviating the contradiction between the current phased oversupply of corn and insufficient supply of soybeans. Determining the scale of fallow by setting a variety of food supply and demand scenarios is conducive to flexibly responding to changes in the food market. (3) A rotation and fallow layout that takes into account the planting suitability and agglomeration of cultivated land is conducive to making full use of the comparative advantages of cultivated land resource endowments, developing large-scale operations, and playing an important role in improving the efficiency of cultivated land use. This research has helped to realize the simultaneous improvement of the spatial suitability, spatial agglomeration, rationality of planting structure, and the stability of food supply and demand of cultivated land, by rationally reconstructing the farmland rotation and fallow space in the black soil region, which provides policy reference for realizing sustainable utilization of cultivated land resources and food security in black soil regions.

Key words: sustainable use of cultivated land, crop rotation and fallow, spatial reconstruction, food security, typical black soil region in Northeast China