东北地区农业土地资源潜力评价模型及其应用

对一个地区的农业土地生产潜力进行估算，可以反映该地区的气候生产力水平和农业资源协调的程度及其地区差异。选择应用目前通用的土地潜力分析评价模型进行参数调整，在此基础上形成东北地区农业土地资源潜力评价模型，并在GIS的支持下，计算了东北地区主要作物-玉米和大豆的农业气候生产潜力，并分析了各地农业自然资源利用率的空间差异。结果表明，东北地区各地光合潜力差异不大；由于南北跨度大，各地光温潜力差异非常大，且从北到南呈带状增加趋势；由于各地作物生育期降水呈地带性分布，使得各地气候生产潜力具有较大差异，由两向东逐渐增加。各地主要作物农业自然资源利用率差别较大，东北两部地区资源利用率较低，增产潜力巨大。

Establishment and its application of model for evaluation of agricultural land potential productivity in Northeast China

Estimation of potential productivity of agricultural land for a region could gain information on climatic productivity, harmony degree of agricultural resources and regional differences. This paper reports that a universal model for evaluation of land potential productivity was chosen and revised as an evaluation model for agricultural land resources of Northeast China. With this model and GIS technology, climate potential productivity of main crops, such as maize and soybean, in Northeast China was calculated. In addition, spatial differences of use ratio of agricultural natural resources in Northeast China were also analyzed. The results showed that there was no significant difference between photosynthetic potential productivities of different areas. However, the differences between photosynthetic and thermal potential productivities in different locations were very significant. Photosynthetic and thermal potential productivities were increasing from northern to southern part because of the large latitude span of the study area. Zonal distribution of rainfall in growing season of different locations led to comparatively big discrepancies between climatic potential productivities. Climatic potential productivity was increasing from western to eastern gradually. There were big differences among use ratios of agricultural natural resources in the whole Northeast plain. The resource use ratios of western part of Northeast China were lower than that of eastern part, which means that there may be a big potential to increase crop yields in western part.