海河冲积平原区农用地综合生产能力空间差异

Spatial Difference of Integrated Productivity of Cultivated Lands in Alluvial Plain Area of Haihe River

以海河冲积平原区为例,通过典型样点调查建立样点标准粮和相应的农用地自然质量等级指数的函数方程,求算理论生产能力;结合近3a(2003—2005年)的粮食实际产量,分析农用地的粮食增产潜力、农用地利用强度及其整理优势。结果表明:全区耕地粮食理论总生产能力为3.03×107t,远高于近3a1.49×107t的粮食平均实际产量,目前该区粮食安全的耕地资源保障程度较高。通过整理优势分析,划定了区域的不同整理优势级别,整理优势大的区域主要集中在冀中南冲积平原区,受灌溉条件、农田基础设施、管理水平的限制,粮食生产能力的开发程度低,粮食生产有较大的增产空间。

Based on the investigation of typical sampling sites in the alluvial plain of the Haihe River, a functional equation, covering standard grains and natural quality of corresponding farmland, etc. , was established and used to calculate theoretic productivity. By referring to the data of actual grain output in the 3 years （2003--2005）. Grain yield-increasing potential, land use intensity and management advantage of these farmland were analyzed. Results show that the gross theoretical productivity of the farrrtland in the Haihe River alluvial plain area was 3.03 × 10^7 t, much higher than the actual output, 1.49 × 10^7 t on average in the three years 2003 -2003. Currently, farmland resources for grain security is highly guaranteed. Through analysis of management advantage, the farmlands are sorted into different grades. Farmlands high in management advantage are concentrated in the alluvial plain area in Central South Hebei Province, where the grain productivity is under-developed due to limitation in irrigation facilities and other farmland infrastructures, and management level. So there is much room for the farmlands therein to increase grain output.