基于农用地分等的粮食生产能力田间质量限制研究

Field quality limit to grain potential productivity based on farmland classification

农用地自然质量分能否正确反映耕地田间质量因素对粮食生产能力的作用,是农用地分等成果应用于粮食生产能力核算的关键问题。据此,该文依据天津市农用地分等成果,从自然质量等指数的计算过程出发,将自然质量分视为田间质量限制系数,应用回归分析的方法,探讨了耕地田间质量因素对粮食产量形成的影响,从而为农用地分等成果应用于区域粮食生产能力的核算提供思路。研究得到了以下结论:农用地自然质量等指数与标准粮的相关关系显著,农用地分等成果正确地反映了耕地质量及其粮食生产能力;自然质量分与标准粮产量的相关关系较差,但自然质量分的高低总体上与粮食产量呈正相关,即田间质量限制系数起到了耕地田间质量因素对作物产量的正确"限制"作用;但须设置控制性田间试验,才能在机理上建立各田间质量因子与产量的定量化模型,从而使得耕地质量评价指标体系更精准。

The application of farmland classification results to grain potential productivity depends to a great extent on whether farmland natural quality cent expresses the effect that field quality works on its grain potential productivity correctly. Hereby, considering farmland natural quality cent as field quality limit coefficient（FQLC）, the effect of field quality on grain yield was discussed in this study, using a regression analysis method based on the farmland classification results in Tianjin, China. The results showed that the grade index of farmland natural quality was significantly correlated with the standard grain yield, and the influence of farmland quality on grain output was able to be reflected through the farmland classification results. In general, the standard grain yield increased with increasing farmland natural quality cents, which indicated that FQLC could be used to explain the correction of field quality to grain output. However, controllable field experiments are necessary for understanding the mechanism between field quality and grain output, and constructing rational indicator system for farmland quality assessment in further.