作　　者： ; ; ; ; ;

机构地区： 新疆大学资源与环境科学学院绿洲生态教育部重点实验室

出　　处： 《自然灾害学报》 2012年第5期79-87,共9页

摘　　要： 土壤的盐渍化是干旱区农业发展的主要障碍,也是影响绿洲生态环境稳定的重要因素。利用破碎度(C)、分离度(F)、优势度(D)等景观格局指数及景观脆弱度(S)建立了盐渍化景观危险度(SR)评价指数以研究渭干河-库车河流域盐渍化地的危险程度。选择新疆渭干河-库车河流域1989年和2001年Landsat-TM图像为本底数据,结合野外调查样本进行实例验证。研究表明,在12年期间,由于研究区内人类活动不断加强,景观结构变化导致盐渍化景观危险度指数明显增高,综合盐渍化危险度指数(SCR)由0.4832上升到0.5234,盐渍化危险度有扩大的趋势,评价结果与实际情况有较好的一致性。该方法对提高不同干旱区域土壤盐渍地危险度评价的准确性及定量化具有一定的参考意义。 Salinization is the main obstacle that restricts the district agricultural development in arid regions.It is also a key factor that influences the stability of the ecological environment in the oasis.This paper established a hazard degree evaluation index system for soil salinization landscape using indices of fragmentation,separation,dominance and landscape vulnerability,to analyze the temporal and spatial characteristic variations in the Weigan-Kuqa River Basin.A case verification was made based on the remote sensing data of Weigan-Kuqa River basin in 1989 and 2001.It shows that during the 12 years,landscape salinization hazard degree increased obviously due to the ever increasing human activities in the study area and the resultant change in landscape structure.The comprehensive salinization hazard index had increased from 0.4832 to 0.5234,and the salinization hazard degree has a rising trend.The estimation results are consistent with the practical situation.The presented method combined qualitative analysis and quantitative analysis,and can give a reference to improving assessment accuracy of soil salinization hazard in different arid regions.

关 键 词： 土壤盐渍化危险度 景观指标 时空分异 渭干河 库车河流域

领　　域： [农业科学]