Evaluation system of the ecological environments based on GISA case study in Qinghai Province

Based on Technical Criterion for Ecoenvironmental Status Evaluation and The System of Ecological Environment Assessment Based on GIS, the ecological environment quality of Qinghai Province was comprehensively assessed by the method of spatial statistics and analyst of ArcGIS in 2004, 2006 and 2007, respectively. The advantages and disadvantages of Technical Criterion for Ecoenvironmental Status Evaluation and The System of Ecological Environment Assessment Based on GIS were discussed in this study. The results of this study showed that the ecoenvironmental quality index (EI) was far lower than that of the whole China and the average value of EI in 2004, 2006 and 2007 was 27.43, 27.73 and 29.97 respectively. EI gradually increased from northwest to southeast, implying that the ecoenvironment quality became gradually better. This study showed that that The System of Ecological Environment Assessment Based on GIS was better than Technical Criterion for Ecoenvironmental Status Evaluation, whose error was less than 1 km2.