数字农科院2.0

Temporal and spatial variations of grassland desertification monitoring in Tibet of China

文献类型： 外文期刊

作者： Xu, B.;Li, J. Y.;Jin, Y. X.;Qin, Z. H.;Wang, D. L.;Ma, H. L.;Yang, X. C.;Li, J. Y.;Wang, Z. L.;Wu, M. Q.;Zhang, J.

作者机构：

期刊名称： INTERNATIONAL JOURNAL OF REMOTE SENSING

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Tibet, the largest region of the Qinghai-Tibet Plateau, is undergoing extensive grassland deterioration and desertification due to both human and natural factors. Alpine meadow and grassland restoration is difficult after degradation; consequently, the desertification of the Tibetan grassland has attracted substantial social attention. This article considered Amdo, Baingoin, Coqen, and Zhongba counties in Tibet as the study areas, employed remote-sensing data, and developed Tibetan grassland desertification classification indices based on field surveys. Moreover, this study used spectral mixture analysis (SMA) methods to interpret remote-sensing image data from the study areas during three periods (1990, 2000, and 2009) and considered the bare sand (gravel) area proportion as the main basis for the evaluation of grassland desertification. The results of this study demonstrate that the slightly, moderately, and severely desertified grasslands of the monitoring zone covered a total area of 114,113.16km(2) in 1990, accounting for 82.12% of the study area. The area exhibited no change in 2000 and decreased by 4472.31km(2) in 2009. The severely desertified grassland area declined from 1990 to 2009. The degree of grassland desertification in these four Tibetan counties diminished from 1990 to 2009, and the grassland desertification area exhibited a gradual reduction during the same period. Regarding other soil coverage types, the ice and snow area markedly changed and declined to approximately one-third of its original extent during these 20years, and most of the ice and snow area was converted to bare land and various types of desertified grassland.

分类号： TP

  • 相关文献
作者其他论文 更多>>