However, primary causations consist in that different physiognomy types lack index system of farmland appraisal, and that any land appraisal must choose index system before it values.

• 然而，究其原因，主要在于不同地貌类型区农用地质量等级评价指标体系的缺乏，而任何土地分等定级工作都是在选定指标体系的前提下开展的。