【摘要】 研究土壤p H及养分变化趋势，对科学施肥、因地制宜开展高标准农田建设、持续推进测土配方施肥技术具有重要意义。通过收集1980年第二次全国土壤普查数据、2010年耕地地力评价数据和2022年第三次全国土壤普查数据，基于ArcGIS技术开展眉山市东坡区耕地土壤pH和养分的时空分布和等级变化特征分析。结果表明：1980—2022年东坡区土壤p H逐步降低，有机质、全氮含量呈先增加后减少趋势，有效磷、速效钾含量均呈增加趋势。西部土壤pH整体较低，各养分指标整体呈中东部高西部低的特点。就等级变化而言，全区耕地土壤酸化现象严重，各养分指标均处于中等或中等偏上水平。全区耕地土壤整体偏酸性、耕地土壤酸化现象严重，养分整体呈增加趋势，本研究可为东坡区高标准农田建设、养分管理提供科学依据。更多还原

【Abstract】 The trends of soil pH and nutrient changes is of great significance for soil nutrient management,scientific fertilization,tailored construction of high standard farmland and continuous promotion of soil testing and formula fertilization technology. The spatiotemporal distribution and grade change characteristics of soil pH and nutrients in Dongpo district,Meishan city over the past 40 years were compared and analyzed by collecting data from the second national soil census in 1980,the land fertility evaluation data in 2010,and the third national soil census data in 2022. In the past 40 years,the soil pH in the study area gradually decreased,and the overall nutrient content showed an increase followed by a decrease in organic matter and total nitrogen content,while the contents of available phosphorus and available potassium showed an increasing trend. The overall pH of the soil in the western region showed relatively acidic,and various nutrient indicators were characterized by high values in the central and eastern regions and low values in the western regions. In terms of grade change,soil acidification was serious in the whole region,and all nutrient indexes were at a medium or above medium level.The phenomenon of cultivated soil acidification in the whole area was serious,and the overall nutrient trend was increasing.This study could provide scientific basis for the construction of high standard farmland and nutrient management in Dongpo district.更多还原