基于SPOT_NDVI的甘肃省植被覆盖变化及其与气候、地形因子的关系

植被覆盖时间序列特征体现了气候变化和人类活动对环境的影响，利用2000~2018年SPOT_NDVI并结合气象和地形数据，采用趋势分析、偏相关分析、地形面积修正等方法探究甘肃省植被覆盖的变化特征及与气候、地形的关系。研究表明：近19年来，甘肃省植被覆盖整体呈恢复状态，但低覆盖区面积仍为最大，空间分布总体呈现南高北低的状态。降水对省内植被生长总体起到促进作用，特别是黄土高原地区，植被覆盖度与降水有显著的正相关性；在南部湿润区和北部干旱区，气温对植被生长分别起到促进和抑制作用。就地形而言，海拔2 500~3 000 m、坡度大于25°的半阳坡地区最适宜植被生长。进行植被覆盖研究，有利于区域生态建设和持续性发展，同时对人地关系以及经济发展的统筹规划也有重要的理论与实际意义。

Vegetation Cover Change and Its Responses to Climate and Topography in Gansu Province Based on SPOT_NDVI

The time series of vegetation cover reflects the impact of climate change and human activities on the environment. To explore the variation characteristics of vegetation cover and its responses to climate and topography in Gansu Province, multiple methods such as the trend analysis, partial correlation analysis, and topography area correction were utilized to analyze the SPOT_NDVI time series data, as well as the meteorological and topographic data. It was found that, in the past 19 years, the vegetation cover in Gansu Province has recovered, however, there was largest areas with low vegetation cover. The spatial distribution of vegetation cover is generally high in the south and low in the north. It was found that vegetation cover was significantly positively correlated with precipitation in most parts of Gansu Province, especially in the Loess Plateau. In the humid regions of the south and the arid regions of the north, temperature promotes and inhibits vegetation growth respectively. In terms of topography, the semi-sunny slope area with an altitude of 2 500-3 000 m and slope of more than 25° is most suitable for vegetation growth. The study of vegetation cover is conducive to the planning of ecological construction and sustainable development. At the same time, it is of great theoretical and practical significance to the planning of human-land relations and economic development.