关键词: 土壤pH, 时空变异, 影响因素, 成都平原

Abstract: The temporal-spatial variability of soil pH in the Chengdu basin is expressed by the spatial analytic approaches such as ordinary kriging(OK) on the basis of the software ArcGIS Desktop 9.0. The average content of soil pH, which changes from 6.95±0.90 in 1982 to 6.70±0.78 in 2002 with a decrease of 3.60%, has shown a decreasing tendency during 20 years. Although there is just a little decrease in the average content of soil pH, soil pH of 46.29% area in the basin decreases and that of 53.71% increases. The area distribution of soil pH is different, soil pH increases in the northeast part such as from Dujiangyan to Pengzhou, the boundary between Qionglai and Pujiang, the place where Chengdu marches with Longquanyi and Shuangliu;it changes slowly in the central part;but soil pH in some places such as Jingtang and Pujiang decreases sharply. The change of soil pH is remarkably influenced by soil parent material, land use types, fertilization measure and industry development.

Key words: soil pH, temporal-spatial variability, influence factors, Chengdu Plain