川南地区耕地土壤pH时空变化分析——以宜宾市南溪区长兴镇为例

Analysis of Spatial and Temporal Change of the Farmland Soil pH in Southern Sichuan Province——A Case Study of Changxing,Nanxi District of Yibin

基于1982年全国第二次土壤普查数据和2008年国家测土配方项目数据,利用SPSS17.0和Arc GIS9.0软件平台对宜宾市南溪区长兴镇耕地土壤pH进行研究.结果表明,长兴镇耕地土壤整体偏酸性,呈北高南低的特点,pH范围在4.2～9.4之间.经过近30年的时间,长兴镇土壤pH已由1982年时的6.8降到2008年的5.9,其中以沙溪庙组紫色砂泥岩下发育的淹育型水稻土下降得最快.

Based on the data from the Second Soil Census in 1982 and the 2008 National Formula Fertilization Project by Soil Testing, a research was made into the spatial and temporal change of soil pH in Changxing, Nanxi, City of ~ibin, using the SPSS17.0 and ArcGISg. 0 software. The results showed that the soil of Changxing was generally acidic, which was more a- cidic in the north while less acidic in the south. The farmland soil pH ranged from 4. 2 to 9.4. Over a period of nearly 30 years, the soil pH reduced from 6.8 to 5.9 with a sharpest decrease detected in the submerged paddy soil which was developed in pur- ple sand shale, from the Shaxi Temple Group.