Abstract:

Abstract：Based on the statistical data of ecological environment in Tongchuan city during 2001-2007, the change of environmental vulnerability is analyzed using the method of principle component analysis. The results show that environmental vulnerability index is showing a "substantial increase - significantly decreased - slightly up - slightly down" variation during 2001-2007 years. The environmental vulnerability index is less than 1 only in 2005 and 2007 years, so Tongchuan city is slightly vulnerability grade. The environmental vulnerability index is more than 1 in other years, so Tongchuan city is highly vulnerability grade in these years. In 2002, the environmental vulnerability index is 20.13 times in 2005. We recommend that Tongchuan city government should increase total investment in pollution controllment and per capita green area, improve up-to-standard rate of wastewater emission, reduct noise in the future.