• 专栏：高原科学与可持续发展 •

气候变化和工程活动对青藏铁路沿线植被指数时空变化的影响

1. 1.河南理工大学 自然资源部矿山时空信息与生态修复重点实验室,焦作 454003
2.江苏师范大学 地理测绘与城乡规划学院,徐州 221116
3.广西壮族自治区国土测绘院,南宁 530023
4.中国科学院空天信息研究院 遥感科学国家重点实验室,北京 100101
5.中国科学院寒区旱区环境与工程研究所 冰冻圈科学国家重点实验室青藏高原研究站,兰州 730000
• 收稿日期:2020-06-15 接受日期:2020-09-16 出版日期:2021-01-10 发布日期:2021-03-10
• 作者简介:马超（1967-）,男,内蒙古自治区克什克腾旗人,博士,教授,博士生导师,研究方向为自然灾害遥感、生态环境遥感。E-mail: mac@hpu.edu.cn
• 基金资助:
国家自然科学基金资助项目(41975036);国家自然科学基金委员会与英国皇家学会合作交流项目(4191101440);河南理工大学创新型科研团队项目(T2018-4)

Impact of climate change and engineering activities on spatio-temporal changes of vegetation index along Qinghai-Tibet Railway

MA Chao1(), CUI Peipei2, ZHONG Guangrui3, MENG Meng4, YANG Cheng1, MA Wensi5

1. 1. Key Laboratory of Spatio-temporal Information and Ecological Restoration of Mines (MNR), Henan Polytechnic University, Jiaozuo 454003, Henan, China
2. School of Geomatics & Planning, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
3. Guangxi Institute of Land Resource Surveying & Mapping, Nanning 530023, China
4. State Key Laboratory of Remote Sensing Sciences, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China
5. Cryosphere Research Station on the Qinghai-Tibet Plateau/State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
• Received:2020-06-15 Accepted:2020-09-16 Online:2021-01-10 Published:2021-03-10

Abstract:

The fragile ecological zone of the Tibetan Plateau is extremely sensitive to human activities and global changes. To reveal the response characteristics of the normalized difference vegetation index (NDVI) to engineering activities and climate changes in the direct impact area and ecological check area (CK) of the Qinghai-Tibet Railway construction, GIMMS AVHRR NDVI3g plus data (1982-2015), MODIS NDVI data (2001-2018), and meteorological data from the same period were selected in this study. Using the maximum value compositing (MVC) method, the annual maximum NDVI and interannual average NDVI of the direct impact area (8-km buffer zone) and CK (16-km buffer zone) along the Qinghai-Tibet Railway were obtained, and trend, variation, correlation, and residual analyses were performed. The results show the following aspects. (1) Using spatio-temporal pseudo-invariant features, the spatial heterogeneity component and periodic greenness component from vegetation coverage were eliminated, and the contribution of climate change and engineering activities were identified. (2) The annual NDVI along the Qinghai-Tibet Railway was highly responsive to climate change and engineering activities. In the early stage of construction, the annual NDVI mainly responded to climate change, and the annual NDVI showed a slowly rising trend. In the middle stage of construction, it mainly responded to engineering activities, and the annual NDVI showed a significant downward trend. In the operation of the railway, it responded to a combination of climate change and engineering activities, and the annual NDVI slowly increased. (3) The engineering activities of the Qinghai-Tibet Railway had a significant impact on the vegetation along the railway. In the early stage of construction, the annual NDVI growth rates in the direct impact area and CK were similar. In the mid-construction period, the annual NDVI growth rate in the direct impact area was lower than that in the CK. In the operation of the railway, the annual NDVI growth rate in the direct impact area was higher than that in the CK. (4) From 1982 to 2015, climate change along the Qinghai-Tibet Railway responded significantly to global change. In the Xining-Golmud section, the temperature increase rate was 0.57°C/10a, and the precipitation growth rate was 4.67 mm/10a; in the Golmud-Lhasa section, the temperature increase rate was 0.20°C/10a, and the precipitation growth rate was 1.78 mm/10a. Both temperature and precipitation increased.