land deterioration

With the increase of population and decrease of petroleum output in Daqing area, the change of land use is more notable and the intensity of land use is more strengthened, which lead to the land deterioration, soil and water pollution, bio-diversity decreased.

随着人口增长和石油产量的逐年降低，大庆市对土地利用模式的改变及对土地利用强度的加大，导致土地退化，土壤污染，水污染加重和生物多样性降低等后果；

The assessment system of ecological quality indices ( EQI) consisting of organism abundance index, vegetation cover index, rivers density index, land deterioration index and pollution load index was used to investigate ecological environmental quality of Hunan province.

以生物丰度指数、植被覆盖指数、水网密度指数、土地退化指数、污染负荷指数为评价因子，运用生态环境质量指数（EQI）的评价体系，对湖南省生态环境进行了分析与评价。