Yan Yujie, Xin Zhiming, Bai Xuying, Zhan Hongbin, Xi Jiaju, Xie Jin, Cheng Yiben
School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China.
The Sand Forestry Experimental Center, Chinese Academy of Forestry, Bayannur 015200, China.
Plants (Basel). 2023 Jul 4;12(13):2550. doi: 10.3390/plants12132550.
Frequent dust storms on the Mongolian Plateau have adversely affected the ecological environmental quality of East Asia. Studying the dynamic changes in vegetation coverage is one of the important means of evaluating ecological environmental quality in the region. In this study, we used Landsat remote sensing images from 2000 to 2019 on the Mongolian Plateau to extract yearly Normalized Difference Vegetation Index (NDVI) data during the growing season. We used partial correlation analysis and the Hurst index to analyze the spatiotemporal characteristics of the NDVI before and after the establishment of nature reserves and their influencing factors on the GEE cloud platform. The results showed that (1) the proportion of the region with an upwards trend of NDVI increased from 52.21% during 2000-2009 to 67.93% during 2010-2019, indicating a clear improvement in vegetation due to increased precipitation; (2) the increase in precipitation and positive human activities drove the increase in the NDVI in the study region from 2000 to 2019; and (3) the overall trend of the NDVI in the future is expected to be stable with a slight decrease, and restoration potential is greater for water bodies and grasslands. Therefore, it is imperative to strengthen positive human activities to safeguard vegetation. These findings furnish scientific evidence for environmental management and the development of ecological engineering initiatives on the Mongolian Plateau.
蒙古高原频繁的沙尘暴对东亚的生态环境质量产生了不利影响。研究植被覆盖度的动态变化是评估该地区生态环境质量的重要手段之一。在本研究中，我们利用2000年至2019年蒙古高原的陆地卫星遥感影像，提取生长季的年度归一化植被指数（NDVI）数据。我们在GEE云平台上使用偏相关分析和赫斯特指数，分析了自然保护区建立前后NDVI的时空特征及其影响因素。结果表明：（1）NDVI呈上升趋势的区域比例从2000 - 2009年的52.21%增加到2010 - 2019年的67.93%，表明由于降水增加，植被有明显改善；（2）2000年至2019年，降水增加和积极的人类活动推动了研究区域NDVI的增加；（3）未来NDVI的总体趋势预计将稳定但略有下降，水体和草地的恢复潜力更大。因此，必须加强积极的人类活动以保护植被。这些发现为蒙古高原的环境管理和生态工程倡议的发展提供了科学依据。
