耕地分等因素对粮食产量的影响

为探讨耕地分等因素对粮食产量的影响，本文采用空间分析、模型分析、定量与定性分析相结合等方法，分别建立了耕地分等单因素与粮食产量间定量关系序列和因素组合与粮食产量的关系模型。模型分析结果表明：分等单因素的级别变化会引起粮食生产能力的改变，变化幅度在45～1 335 kg/km2，变化最大值是有效土层厚度在2～3级间的改变，最小值为排水条件1～2级间的改变；因素组合对产量的影响表现出某一因素指标值的改变，会引起耕地自然质量分的改变和产量的变化，自然质量分在0.5～2.4之间变化，对应的粮食产量变化范围为760～11 000 kg/km2，即自然质量分每变化0.1，粮食产量变化500 kg/km2。研究结论表明，耕地分等单因素及其因素组合的变化对粮食产量均产生较大影响，粮食生产能力建设应根据耕地分等不同区域的因素特征制订具体措施。

Influences of farmland classification factors on grain production

In order to explore the influences of farmland classification factors on grain production,the paper adopted spatial analysis,modeling analysis,qualitative analysis and quantitative analysis and so on.Model of quantitative relationship between farmland classification single-factor and grain production,and relation model between combined factors and grain production were established.The results of modeling analysis showed that the grade change of classification single-factor led to the change of grain product...