Abstract Ecological degradation has become an important constraint to global socio-economic development. Therefore, ecological protection and restoration has received increasing attention. The important goal and the most direct effect of ecological protection and restoration are the vegetation restoration, which emphasizes the maximum or minimum range of NDVI of different vegetation types under specific terrain conditions. Based on the data of NDVI and topographic factors in a stable ecosystem, this paper comprehensively used descriptive statistics, multiple regression with interaction terms and threshold regression to analyze the spatial distribution of vegetation and its relationship with elevation, slope and aspect in the Wanhuigou catchment on the Loess Plateau. It showed that the NDVI values were high in the northwest and low in the southeast, and were generally consistent with the distribution of elevation. The change of NDVI with the slope was large, but the change with the aspect was not obvious. Meanwhile, the effect of elevation on NDVI would be limited by slope, but would not be affected by aspect; the positive effect of slope on NDVI would also be limited by the elevation and aspect. In addition, the influence of topographic factors on NDVI was non-linear, i.e. there was a threshold effect and different types of vegetation require different topographic factor conditions. Therefore, by rationally arranging the growth areas of different types of vegetation in accordance with the laws of topographic factor conditions, ecological protection and restoration could be more targeted to help build a stable ecosystem in areas with severe soil erosion such as the Wanhuigou catchment.

中文翻译：

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探索黄土高原万回沟流域植被生长适宜的地形因子条件：生态保护与恢复的新视角

摘要 生态退化已成为全球社会经济发展的重要制约因素。因此，生态保护与修复越来越受到重视。生态保护和恢复的重要目标和最直接的作用是植被恢复，它强调在特定地形条件下不同植被类型的 NDVI 的最大或最小范围。本文以稳定生态系统的NDVI和地形因子数据为基础，综合运用描述性统计、多元回归、交互项回归和阈值回归，分析了万回沟流域植被的空间分布及其与高程、坡度、坡向的关系。黄土高原。表明 NDVI 值西北高东南低，且与海拔分布基本一致。NDVI随坡度变化较大，但随坡向变化不明显。同时，高程对NDVI的影响会受到坡度的限制，而不受坡向的影响；坡度对 NDVI 的积极影响也会受到海拔和坡向的限制。此外，地形因素对NDVI的影响是非线性的，即存在阈值效应，不同类型的植被需要不同的地形因素条件。因此，根据地形要素条件的规律，合理布置不同类型植被的生长区，可以更有针对性地进行生态保护和修复，帮助万汇沟流域等水土流失严重的地区构建稳定的生态系统。