1984—2014年仪征市农田土壤酸化驱动因素分析

Driving Factors Analysis of Cropland Acidification of Yizheng City from 1984 to 2014

以仪征市为例,基于1984、1994、2005、2014年仪征市代表性的土壤样品点pH,1984和2014年遥感影像数据,1995—2017年酸雨频率数据,1980—2006年农户施肥数据,分析1984—2014年仪征市农田土壤pH时空变化趋势,并从土地利用方式、酸雨频率和农户施肥行为等3方面解析了农田土壤酸化的驱动因素。结果表明:1984—2014年,仪征市农田土壤pH显著降低,呈现酸化趋势,酸化区域主要集中在仪征市北部和南部;建设用地扩张占用耕地和道路网络建设、酸雨频率变化、有机肥的施用量减少和化肥施用量的增多是造成仪征市农田土壤酸化的主要驱动因素。

Taking Yizheng City as an example,based on the representative soil sample point pH values in 1984,1994,2005 and 2014,remote sensing image data in 1984 and 2014,acid rain frequency data in 1995-2017,and fertilization data of farmers in 1980-2006,we analyzed the temporal and spatial variation trend of soil pH in Yizheng City from 1984 to 2014,and analyzed the driving factors of cropland soil acidification from three aspects,such as the land use pattern,acid rain frequency,fertilization behavior of farmers and so on.The results showed that from 1984 to 2014,the soil pH of cropland in Yizheng City decreased significantly,showing an acidification trend.The acidification areas mainly concentrated in the north and south parts of Yizheng City.The main driving factors of soil acidification in Yizheng City were the expansion of construction land,the construction of road network,the change of acid rain frequency,the decrease of organic fertilizer application and the increase of chemical fertilizer application.