关键词: 减碳视角, 北方农牧交错带, 农业结构调整, 法治体系

Abstract: The farming-pastoral ecotone in northern China is the climate intersection zone between the semi-humid region and the semi-arid region. The adjustment of agricultural structure is an eternal theme in the process of agricultural economic development. From the perspective of reducing carbon emission and increasing carbon sink， and based on ecological priority development， opportunity cost， externality， law and economics， Pareto optimality and other theoretical basis， this paper used carbon emission model， carbon absorption model， decoupling model and other methods to make an empirical analysis of the carbon emission of farmland ecosystem， carbon uptake of crops per unit area， and the decoupling relationship between carbon emission and agricultural output value. The research conclusion showed that to achieve the purpose of reducing carbon emission， enhancing carbon sink function and developing agricultural economy， the studied areas need to adjust and optimize agricultural structure. In addition， in view of the problems such as increasing opportunity cost， direct economic loss and positive externalities caused by agricultural structure adjustment， this paper puts forward the suggestion of building the legal system of agricultural structure adjustment to stimulate and regulate the agricultural structure adjustment behavior through macro-control and market regulation.

Key words: Carbon reduction perspective, Northern farming-pastoral ecotone, Structural adjustment of agriculture, Rule of law system