西鄂尔多斯地区植被NDVI时空变化及其对气温和降水的响应

Spatiotemporal Variation of the NDVI and Its Responses to Temperature and Precipitation in West Ordos

西鄂尔多斯地区现存许多珍稀动植物,是生物多样性保护的重点区域,该地区地处北方生态环境脆弱带,对环境变化敏感。为了解该地区植被覆盖的变化及影响因素,基于MODIS NDVI数据及同期气象数据,采用趋势线分析、重心迁移模型和偏相关分析方法,对西鄂尔多斯地区2000—2020年生长季(4—10月)植被覆盖度变化趋势及其影响因素进行研究。结果表明,西鄂尔多斯80.28%的区域植被NDVI(normalized difference vegetation index)在2000—2020年间显著增加(P<0.05),且重心迁移结果显示东南区域增长更加明显。偏相关分析表明降水是影响该地区植被覆盖变化的主要气候因素,尤其表现在研究区西南半部的乌海市与鄂托克旗。

The west Ordos has many rare animals and plants and is a key area for biodiversity protection region.It is located in the fragile zone of northern ecological environment and is very sensitive to environmental changes.To understand the changes of the vegetation and its influencing factors in the region,the related investigation and analysis were implemented based on trend analysis,gravity migration model and the partial correlation analysis by using MODIS NDVI datasets combined with the meteorological date in the growing season(April—October)of west Ordos from 2000 to 2020.The results showed that 80.28%of the vegetation NDVI in west Ordos increased significantly(P<0.05)during 2000—2020,and the increase was more obvious in the southeast region according the results of center of gravity migration.The bias correlation analysis indicated that the precipitation was the main climatic factor affecting the change of vegetation cover in the region,especially in Wuhai and Etuoke Banner in the southwest half of the investigated area.