干旱区研究 ›› 2024, Vol. 41 ›› Issue (12): 2143-2153.doi: 10.13866/j.azr.2024.12.15 cstr: 32277.14.AZR.20241215

• 生态与环境 • 上一篇    下一篇

祁连山南坡植被绿度时空变化及其对气候变化和人类活动的响应

张倩1,2(), 曹广超1,2,3(), 张乐乐1,2, 赵美亮1,2   

  1. 1.青海师范大学青藏高原地表过程与生态保育教育部重点实验室,青海 西宁 810008
    2.青海师范大学地理科学学院,青海省自然地理与环境过程重点实验室,青海 西宁 810008
    3.青海省人民政府-北京师范大学高原与可持续发展研究院,青海 西宁 810008
  • 收稿日期:2024-04-21 修回日期:2024-10-14 出版日期:2024-12-15 发布日期:2024-12-20
  • 通讯作者: 曹广超. E-mail: caoguangchao@qhnu.edu.cn
  • 作者简介:张倩(1998-),女,硕士研究生,主要从事遥感与地理信息系统应用. E-mail: 18309740663@163.com
  • 基金资助:
    青海省自然科学基金项目(2023-ZJ-907M)

Spatiotemporal changes in vegetation greenness on the southern slopes of the Qilian Mountains and their responses to climate change and human activities

ZHANG Qian1,2(), CAO Guangchao1,2,3(), ZHANG Lele1,2, ZHAO Meiliang1,2   

  1. 1. Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation, Ministry of Education, Qinghai Normal University, Xining 810008, Qinghai, China
    2. Qinghai Province Key Laboratory of Physical Geography and Environmental Process, College of Geographical Science, Qinghai Normal University, Xining 810008, Qinghai, China
    3. Academy of Plateau Science and Sustainability, People’s Government of Qinghai Province and Beijing Normal University, Xining 810008, Qinghai, China
  • Received:2024-04-21 Revised:2024-10-14 Published:2024-12-15 Online:2024-12-20

摘要:

为探究祁连山南坡植被绿度时空变化及其对气候变化和人类活动的响应,基于GEE平台,利用算法和遥感技术,通过Sen趋势、变异系数、Hurst指数、ArcGIS空间分析以及多元回归残差等分析方法,整合多源数据产品全面解析祁连山南坡植被绿度变化的时空特征,并综合评估其未来变化趋势及稳定性,在此基础上深入探讨气候变化和人类活动对植被绿度的影响程度。结果显示:(1) 2001—2020年祁连山南坡的植被绿度总体呈上升趋势,且空间差异性显著。从稳定性分析来看,其变异系数介于0~0.84,均值为0.09,植被绿度的变化总体上处于相对稳定的状态,并且其展现出向好的态势。(2) 在影响因素方面,降水和气温均与植被绿度呈正向促进关系,其中与气温的相关性更为显著,并且通过显著性检验的区域占研究区的95.7%,表明气温对植被绿度变化起主要促进作用。(3) 人类活动对植被绿度的变化起到了积极的推动作用。整体来看,植被绿度的变化是气候变化和人类活动共同作用的结果,其中气候变化和人类活动对研究区植被绿度的相对贡献率分别为36.68%和63.32%,人类活动的相对贡献率大于气候变化,这与实施的生态工程密切相关。

关键词: 植被绿度, 时空变化, 气候变化, 人类活动, 祁连山南坡

Abstract:

In this study, we investigated the spatiotemporal changes in vegetation greenness on the southern slopes of the Qilian Mountains and their responses to climate change and human activities. Utilizing the Google Earth Engine platform, we applied algorithms and remote sensing technologies to analyze these changes. By employing Sen’s trend analysis, the coefficient of variation, the Hurst index, ArcGIS spatial analysis, and multiple residual regression methods, we integrated multisource data products to comprehensively analyze the characteristics of vegetation greenness changes. Additionally, we assessed future trends and stability while thoroughly examining the influences of climate change and human activities. The results indicated the following: (1) From 2001 to 2020, vegetation greenness on the southern slope of the Qilian Mountains exhibited an overall upward trend, accompanied by significant spatial variations. Stability analysis revealed that the coefficient of variation ranged from 0 to 0.84, with a mean of 0.09, indicating that changes in vegetation greenness remained relatively stable and exhibited a positive trend. (2) Regarding influencing factors, both precipitation and temperature exhibited a positive correlation with vegetation greenness, with temperature showing a more pronounced effect. Notably, 95.7% of the study area passed the significance test, highlighting that temperature primarily drives changes in vegetation greenness. (3) Human activities have positively influenced changes in vegetation greenness. Overall, these changes result from the combined effects of climate change and human activities, with relative contribution rates of 36.68% for climate change and 63.32% for human activities. The higher contribution rate of human activities is closely linked to the implementation of ecological engineering initiatives.

Key words: vegetation greenness, spatiotemporal change, climate change, human activities, southern slopes of the Qilian Mountains