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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 of soil is a major obstacle to the development of agriculture in arid areas and also an important factor affecting the stability of the ecological environment in oases. The assessment index of salinized landscape risk (SR) was established by using landscape pattern index (FCR), resolution (F), dominance (D) and landscape fragility (S) The salinity of the river basin is dangerous. Landsat-TM images of Weigan-Kuqa River Basin in 1989 and 2001 were selected as the background data, and field samples were selected to verify the results. The results showed that during 12 years, due to the continuous enhancement of human activities in the study area, the change of landscape structure led to a significant increase of the salinization landscape risk index, and the comprehensive salinization hazard index (SCR) increased from 0.4832 to 0.5234. Salinization The danger degree has the tendency to expand, and the evaluation result has a good consistency with the actual situation. The method is of certain reference significance for improving the accuracy and quantification of the risk assessment of soil salinities in different arid regions.