Abstract Land degradation is a universal environmental problem around the world, which affects 1.5 billion people's well-being. Therefore, the efforts to monitor where land degradation has happened and to find out the causes are meaningful for land management and restoration. Arid regions such as Southern Africa have attracted many concerns on land degradation assessment. However, previous studies have neglected the impacts of rainfall variation and possible breakpoints. In this study, the Time Series Segment and Residual Trend (TSS-RESTREND) method was used to detect land degradation in southern Africa and to compare with linear regression, RESTREND methods. Using TSS-RESTREND, 73.22% of the study area was found with vegetation controlled by precipitation, and 18.9% of the study area was found with breakpoints detected. Besides, results demonstrated that these increasing, decreasing, unchanged, and indeterminate pixels respectively made up 21.32%, 9.67%, 42.23%, and 26.78% of the study area. By eliminating positive effects from precipitation and including negative effects from breakpoints, TSS-RESTREND highlighted the potential overestimate of improvement by the linear regression method and the underestimate of degradation by the linear regression and RESTREND methods. These results showed that the land degradation detection with TSS-RESTREND method is useful for land conservation and restoration.

中文翻译：

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使用时间序列分段和残留趋势 (TSS-RESTREND) 检测南部非洲的土地退化

摘要 土地退化是世界范围内普遍存在的环境问题，影响着15亿人的福祉。因此，监测土地退化发生地点并找出原因的努力对于土地管理和恢复具有重要意义。南部非洲等干旱地区引起了许多对土地退化评估的关注。然而，之前的研究忽略了降雨变化和可能的断点的影响。在本研究中，时间序列分段和残差趋势 (TSS-RESTREND) 方法用于检测南部非洲的土地退化，并与线性回归、RESTREND 方法进行比较。使用TSS-RESTREND，73.22%的研究区域被降水控制植被，18.9%的研究区域被检测到断点。除了，结果表明，这些增加、减少、不变和不确定的像素分别占研究区域的21.32%、9.67%、42.23%和26.78%。通过消除降水的积极影响并包括断点的负面影响，TSS-RESTREND 强调了线性回归方法对改进的潜在高估以及线性回归和 RESTREND 方法对退化的低估。这些结果表明，采用 TSS-RESTREND 方法进行的土地退化检测对于土地保护和恢复是有用的。TSS-RESTREND 强调了线性回归方法对改进的潜在高估以及线性回归和 RESTREND 方法对退化的低估。这些结果表明，采用 TSS-RESTREND 方法进行的土地退化检测对于土地保护和恢复是有用的。TSS-RESTREND 强调了线性回归方法对改进的潜在高估以及线性回归和 RESTREND 方法对退化的低估。这些结果表明，采用 TSS-RESTREND 方法进行的土地退化检测对于土地保护和恢复是有用的。