Abstract: Based on remote sensing images and geographic information system, and by using land-scape metrics and Kappa coefficient, this paper studied the farmland landscape change in Wen-chuan County of Minjiang River upper reach. A logistic regression model was used to analyze the driving forces of this change, with elevation, gradient, aspect, and the distances to road, river and settlement as the affecting factors. The results showed that from 1974 to 2000, the farmland area in Wenchuan County kept increasing, with the greatest increment in 1974—1986.In 1986—2000, farmland area had no evident increase, but converted with other landscape types frequently and had an evident spatial position change, especially in the period from 1994 to 2000. Such a farmland change was mainly driven by policy, and the spatial driving forces differed in different periods.

Key words: Contaminated soil, Remediation standard, Methodology, Ecological risk assessment