延河流域土地资源承载力的动态测评

Dynamic Evaluation of Land Carrying Capacity in Yanhe Watershed

以延河流域为典型研究区,构建土地资源承载力评测模型,从定性与定量的角度对研究区的土地资源承载力进行动态测评与时空差异性分析。结果表明:在2000年到2010年间,各个区县土地资源承载力都呈现出两级分化的趋势,虽然两级分化的程度有所差异,但总的趋势是一致的,说明研究区整体土地资源承载力水平下降,需要借助于高效合理、科学的土地优化配置来提高土地资源承载力。对于整个研究区两极分化的情况,应当保证在土地资源承载力富余地区经济稳定发展的情况下,将富余地区的粮食外调给土地资源承载力超载的地区,实现整个区域的土地资源承载力平衡。

The paper builds evaluation model to perform dynamic evaluation on land carrying capacity in Yanhe Watershed typical area in qualitative and quantitative manner.According to the evaluation results of time space change of land carrying capacity based on the typical area,from 2000 to 2010,the land carrying capacity in all lands in four typical areas shows polarization differently,but displays the same trend in general,indicating that the land carrying capacity in research area is on the decline,thus,the efficient and reasonable and scientific land optimization is needed to improve land carrying capacity.As to the polarization in the research area,the areas with margin in land carrying capacity should transfer their grain to the areas lacking of land carrying capacity on the premise of steady development of the economy in areas with margin in land carrying capacity so as to ensure the balance of the land carrying capacity in the area.