面向公路选线的黄河三角洲生态本底状况评估

Ecological Background Evaluation for Highway Alignment Design in Yellow River Delta Area

以黄河三角洲地区Landset7卫星ETM影像为基本信息源,利用Remote Sensing(RS)技术方法提取反映生态本底状况的植被覆盖、土壤退化、土地利用类型评价指标信息,并以地学信息及其他统计资料作为辅助,应用ArGIS软件提取地形坡度、生物多样性评价指标信息。综合以上指标信息,采用GIS(Geographic Information System)分析技术,对黄河三角洲地区生态本底进行综合评价与分析。结果表明:黄河三角洲生态本底状况可以按照等级划分为优、良、中、差、极差,分别占研究区总面积的6%,33%,41.4%,12.3%和7.3%,在总体分布上,黄河三角洲生态本底状况沿黄河两岸向内陆地区逐渐变差。

With ETM images photographed by Landset 7 Satellite as the basic information,the technical method of RS was utilized to extract evaluation indices of vegetation cover,soil degradation,and land use type,which reflected the conditions of ecological background environments. And with geological information and other statistical materials as auxiliary information,the ArcGIS software was utilized to extract evaluation indices of terrain slope and biodiversity. Based on the above indices,analytical technique of GIS was adopted to analyze the ecological background of Yellow River Delta. The results show that the ecological background environments of the Yellow River Delta can be divided into excellent area,good area,middle area,poor area and very poor area,occupying 6%,33%,41. 4%,12. 3% and 7. 3% respectively in the overall of Yellow River Delta. Generally,the ecological background environment of Yellow River Delta is worsened gradually along the Yellow River to inland areas.