中文摘要：

【目的】研究耕地自然质量等级与土壤肥力指标间的关系．【方法】基于化州市耕地质量等级监测工作，将化州市耕地分为4个监测分区，布设38个采样点，调查测定耕地质量监测指标和主要土壤肥力指标，并对其关系进行研究．【结果和结论】耕地自然质量等级指数（y）与土壤主要肥力指标[pH（x1）、碱解氮含量（x2）]间存在如下数学关系式：y＝1300.15＋630.33 x1＋3.24x2．pH、碱解氮含量与耕地自然质量等级的10个原始监测指标均具有显著相关性，与自然质量等指数也具有显著的线性关系．

英文摘要：

[Objective]The relationships between arable land natural quality grade and main soil fertility indicators were studied .[Method] Arable land quality monitoring indicators and the soil fertility indica-tors were investigated after the study area was divided into four monitoring partitions and 38 sampling points were laid , based on the work of Huazhou arable land quality grade monitoring .[Result and con-clusion]The results showed that the mathematical relationship between the arable land quality level （ y） and the main soil fertility indicators [ pH （ x1 ）; available nitrogen content （ x2 ） ] was y =1 300.15 ＋630.33x1 ＋3.24x2 .pH and available nitrogen significantly are correlated with ten original monitoring in-dicators of arable land , and the two fertility indicators and the natural quality grade index also have a sig-nificant linear relationship .