乌鲁木齐市"十二五"期间生物丰度指数变化研究

研究借助计算机监督分类手段,依照《生态环境状况评价技术规范HJ 192-2015》研究了乌鲁木齐市"十二五"期间生物丰度指数(biological richness index,BRI)变化情况.结果表明,乌鲁木齐市"十二五"末建设用地、林地、草地较初期增加16.61%、6.90%、0.57%,未利用地、耕地、水域则减少1.81%、3.31%、5.24%.整体BRI加权值为20.48,较初期下降1.68,其中乌鲁木齐县最高,为27.03,新市区为最低的14.06,总体生物丰度状况略微变差.该研究可为乌鲁木齐市生态环境建设提供依据.

Variation of Biological Richness Index in Urumqi during 12 th Five-Year Plan

The paper presents a discussion on the changes of biological richness index( BRI) in the city of Urumqi using supervised classification based on the classified method of technical criterion for ecosystem status evaluation HJ 192~2015 during the 12th Five-Year Plan(2011-2015). As an overall change in five years, construction land, forest and grassland in 2015 in-creased by16. 61%,6. 90% and 0. 57% compared with that of 2011, while unused land, arable and water showed net reduction with 1. 81%,3. 31% and 5. 24%. In terms of BRI, it was 20. 48 calculated by area weighted method in the study area, and it re-duced by 1. 68 when compared with value of 2011. The optimistic BRI condition occurred in Urumqi in 2015, with a value of 27. 03, while that in Xinshiqu district was only 14. 06. In conclusion, overall BRI condition degraded slightly at the end of the 12th Five-Year Plan. Results of this paper can effectively evaluate the eco-environmental vulnerability grade for references in policy planning and ecological restoration in this area.