对2007年、2018年秦安县125个原位监测点耕地土壤有机质、全氮、有效磷、速效钾、微量元素等耕地土壤养分含量与pH变化进行了分析。结果表明，近11年来耕层土壤速效钾和有效锰含量平均水平有所减少，分别降低了13.27%、16.38%；耕层土壤酸碱度平均值没有变化；其余养分含量都有不同程度的增加，其中土壤有机质、全氮、有效磷、有效铁、有效铜、有效锌分别增长了11.67%，6.38%、57.80%、58.84%、6.51%、137.56%。

The changes of soil nutrient contents and pH values in cultivated land from 125 in-situ monitoring sites in Qinan County from 2007 to 2018 were compared， including organic matter， total nitrogen， available phosphorus， available potassium， and trace elements. The results showed that the average content of available potassium and available manganese in nearly 11 years soil layer decreased to 13.27% and 16.38%， respectively， compared with that in 2007. The average ph value of the topsoil did not change， while the contents of other nutrients increased to different degrees. Among them， soil organic matter， total nitrogen， available phosphorus， available iron， available copper and available zinc increased by 11.67%， 6.38%， 57.80%， 58.84%， 6.51% and 137.56%， respectively.

S158.5

国家自然科学基金“洮河流域生态响应机制及其阈值体系研究”(41671017)。