陕北农牧交错带土地生产潜力研究

根据陕北农牧交错带的生态环境特点以及作物生长发育过程对光、热、水、土资源的要求和利用效率 ,运用逐步订正法定量估算陕北农牧交错带六县区土地生产潜力。研究表明 :陕北农牧交错带光温生产潜力为光合生产潜力的 4 4 .94 % ,光温水生产潜力为光温生产潜力的 37.35 % ,土壤生产潜力为光温水生产潜力的 33.39%。揭示出影响生产潜力的限制性因子及限制强度 ,并据此提出了相应的开发战略和实施途径。

Research on Potential of Land Productivity in Agriculture and Pasturage Interlaced Zone of Northern Shaanxi

Based on environmental characteristics and the requirement and use efficiency of light,heat,water and soil resources by crop in their developing process,this paper estimates the potential of land productivity in quantities by using step correcting method in agriculture and pasturage interlaced zone of northern Shaanxi . It is surveyed that in this region thermal productive potential is 44.94% of light productive potential; climate productive potential is 37.35% of thermal productive potential; and potential climate productivity is 33.39% of land productive potential. The conditions and behaviors of land productive potential in this region can be basically grasped thereby to reveal the constraints and their strengths affecting productive potential. At the same time, this paper describes the guiding suggestions of improving the land actual productivity.