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中国沙漠 ›› 2023, Vol. 43 ›› Issue (3): 96-106.DOI: 10.7522/j.issn.1000-694X.2022.00146

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19822017年黑河流域植被指数动态及其对气候变化与生态建设工程的响应

韩子言1(), 蒙吉军1(), 邹易1, 朱利凯2   

  1. 1.北京大学 城市与环境学院 地表过程分析与模拟教育部重点实验室,北京 100871
    2.华东师范大学 地理科学学院 地理信息科学教育部重点实验室,上海 200241
  • 收稿日期:2022-10-05 修回日期:2022-11-08 出版日期:2023-05-20 发布日期:2023-05-31
  • 通讯作者: 蒙吉军
  • 作者简介:蒙吉军(E-mail: jijunm@pku.edu.cn
    韩子言(1997—),女,天津人,博士研究生,研究方向为干旱区社会生态系统的耦合机制。E-mail: hanziyan@pku.edu.cn
  • 基金资助:
    国家自然科学基金项目(41871074)

Vegetation dynamics and their response to climate change and ecological protection projects in the Heihe River Basin from 1982 to 2017

Ziyan Han1(), Jijun Meng1(), Yi Zou1, Likai Zhu2   

  1. 1.MOE Key Laboratory for Earth Surface Processes,School of Urban and Environmental Sciences,Peking University,Beijing 100871,China
    2.MOE Key Laboratory of Geographic Information Science,School of Geographical Sciences,East China Normal University,Shanghai 200241,China
  • Received:2022-10-05 Revised:2022-11-08 Online:2023-05-20 Published:2023-05-31
  • Contact: Jijun Meng

摘要:

为改善黑河流域生态系统整体功能,缓解植被退化趋势,中国自2000年起先后在黑河流域实施了一系列生态建设工程。在气候变化背景下,客观衡量生态建设工程的效益具有重要意义。本研究基于1982—2017年归一化差异植被指数(NDVI)数据集和气候数据,采用趋势分析研究黑河流域植被的动态变化,结合偏相关分析和残差分析来剥离气候变化和生态建设工程对植被的影响。结果表明:(1)1982—2017年黑河流域植被NDVI总体波动上升,2000年后NDVI增加速率呈上升趋势;(2)气温和降水的增加趋势对NDVI起正向作用,且降水增加对NDVI的影响更显著;(3)自2000年生态建设工程实施后,人类活动对植被NDVI变化的影响占据主导地位,30.18%的研究区受到生态建设工程的正向影响,其中在耕地和林地的表现尤为突出。这表明生态建设工程对黑河流域植被增加产生重要影响。

关键词: NDVI, 气候变化, 生态建设工程, 土地覆被, 黑河流域

Abstract:

In order to improve ecosystem functions and prevent vegetation degradation in the Heihe River Basin, China has implemented a series of ecological protection projects in the Heihe River Basin since 2000. It is of great significance to quantitatively isolate the contribution of ecological projects from the effect of climate change to better assess the effectiveness of these projects. Based on NDVI and climatic datasets in the Heihe River Basin, this study adopted trend analysis to derive the spatial and temporal patterns of vegetation dynamics, and used the combined partial correlation analysis and residual analysis to distinguish the impact of climate change from that of ecological protection projects on vegetation from 1982 to 2017. The results showed that: (1) NDVI exhibited an upward trend in the Heihe River Basin from 1982 to 2017, especially after 2000. (2) Temperature and precipitation had a positive effect on the NDVI, and the increase in precipitation made more contribution to the greening trend. (3) After the implementation of the ecological protection project in 2000, the impact of human activities dominated the change of NDVI. The implementation of ecological construction projects explained up to 30.18% of the total variance of NDVI, and the contribution was even more in cultivated lands and forests. We concluded that the ecological protection projects played an important role in the greening of vegetation in the Heihe River Basin. Our research could improve the understanding of vegetation dynamics in the Heihe River Basin and provide scientific evidence for promoting ecological construction and sustainable development in arid areas.

Key words: NDVI, climate change, ecological project, land cover, Heihe River Basin

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