通过研究贺兰山植被指数的时空变化特征，定量评估贺兰山植被的影响因素，对科学评价贺兰山生态治理工程效益和区域生态系统恢复及其可持续发展提供重要的理论和指导。基于研究区NDVI数据、年均气温、降水量数据及其他数据，采用趋势分析和皮尔逊(Pearson)相关分析、多元回归残差分析方法，从时间和空间尺度研究了贺兰山2000 — 2020年NDVI的变化特征，分析了影响NDVI变化的主要驱动力。结果表明，21 a间，贺兰山NDVI整体呈现波动上升趋势，NDVI改善趋势明显；空间分布整体呈西南高东北低的变化特征，贺兰山中部地区退化趋势明显；降水增加、生态环境保护政策的支持是贺兰山NDVI变化的主要驱动因素，21 a来NDVI变化与年均气温、累计降水量变化均呈单峰型变化趋势。整体来看，NDVI与气温、累计降水均呈波动上升的变化趋势。

This study investigated the spatio-temporal variation characteristics of vegetation index (NDVI) in the Helan Mountains, providing a quantitative evaluation of the factors affecting vegetation and offering significant theoretical and practical guidance for evaluating the effectiveness of ecological restoration projects and sustainable development in the region. Using NDVI data, annual average temperature, precipitation data, and other data from the study area, trend analysis, Pearson correlation analysis, and multiple regression residual analysis were employed to study the changes in NDVI from 2000 to 2020 in the Helan Mountains, examining the main driving forces behind the NDVI variations on both temporal and spatial scales. Results showed that over the 21 years, the NDVI in the Helan Mountains exhibited a fluctuating upward trend, with a significant improvement in NDVI. The spatial distribution showed a general pattern of higher values in the southwest and lower values in the northeast, with noticeable degradation in the central part of the Helan Mountains. Increased precipitation and the support of ecological environment protection policies were the main driving factors for NDVI changes in the Helan Mountains. Over the 21 years, NDVI variations showed a unimodal trend with annual average temperature and cumulative precipitation changes. Overall, both NDVI and the annual average temperature, as well as cumulative precipitation, exhibited a fluctuating upward trend.

TU984.113

宁夏自然科学基金(2023AAC03347)。