青藏高原冻土区划与草原分类一致性分析

Estimation of consistency about permafrost distribution and steppe classification in the Qinghai-Tibetan Plateau

探讨冻土区划与草原分类的一致性,可以为揭示冻土分布和草原分类规律提供依据。以青藏高原为研究区,将研究区内冻土区划划分为多年冻土区、季节冻土区和非冻土区3种类型,它们分别占整个研究区面积的49.64%、46.68%和3.68%;将此研究区内草原分类也划分为3种类型(优势草原类、亚优势草原类和热带草原类),它们分别占整个研究区面积的57.51%、41.08%和1.41%;然后进行图像叠加,通过分析图像分类精度的误差矩阵,可以得到冻土区划和草原分类总体一致性精度为65.95%,说明二者具有明显的一致性。

Correlations between various types of frozen ground and steppes may provide useful insights for the regularity of permafrost distribution and steppe classification,and a better understanding of mutual feedback mechanism between frozen ground and steppes.The frozen ground on the Qinghai-Tibetan Plateau（QTP） is characteristic by permafrost,seasonal frost and others,which occupies 49.64%,46.68% and 3.68% of total areas of QTP,respectively.In contrast,the steppe is divided into dominant grassland,transition grassland and others,which occupies 57.51%,41.08% and 1.41% of total areas of QTP,respectively.Through image merging and analyzing the error matrix of image classification,we found that consistency precision of permafrost distribution and steppe classification is 65.95%,which suggested that conspicuous consistency presents among them.