Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (9): 3003-3013.DOI: 10.11733/j.issn.1007-0435.2025.09.024

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NPP Spatio-Temporal Evolution and Its Influencing Factors in the Three-River Headwaters from 2000 to 2023 Based on MODIS NPP

LI Wen-jing1, LI Wen-long2, XIONG You-cai3, LUO Qiong4, WANG Wen-Ying1,5   

  1. 1. College of Geography Science, Qinghai Normal University, Xining, Qinghai Province 810008, China;
    2. College of Grassland Agricultural Science and Technology, Lanzhou University, Lanzhou, Gansu Province 730000, China;
    3. College of Ecology, Lanzhou University, Lanzhou, Gansu Province 730000, China;
    4. College of Life Science, Qinghai Normal University, Xining, Qinghai Province 810008, China;
    5. Academy of Plateau Science and Sustainability People's Government of Qinghai Province & Beijing Normal University, Xining, Qinghai Province 810008, China
  • Received:2024-10-15 Revised:2024-12-12 Online:2025-09-15 Published:2025-09-22

基于MODIS NPP的2000—2023年三江源地区植被NPP时空演变及影响因素研究

李文静1, 李文龙2, 熊有才3, 罗琼4, 王文颖1,5   

  1. 1. 青海师范大学地理科学学院, 青海 西宁 810008;
    2. 兰州大学草地农业科技学院, 甘肃 兰州 730000;
    3. 兰州大学生态学院, 甘肃 兰州 730000;
    4. 青海师范大学生命科学学院, 青海 西宁 810008;
    5. 青海省人民政府-北京师范大学高原科学与可持续发展研究院, 青海 西宁 810008
  • 通讯作者: 罗琼,E-mail:Qiongluo812@163.com;王文颖,E-mail:wangwy0106@163.com
  • 作者简介:李文静(1994-),女,汉族,甘肃金昌人,博士研究生,主要从事青藏高原生态环境保护研究,E-mail:lwenjingjing@163.com
  • 基金资助:
    国家重点研发计划(2023YFF1304305);111引智基地(D23029)资助

Abstract: Clarifying the current status and driving forces of vegetation Net Primary Productivity (NPP) changes in the Three-River Headwaters region can provide a scientific foundation and decision-making reference for future vegetation restoration and the dynamic adjustment of ecological projects. In this study, based on MODIS NPP data, we analyzed the vegetation NPP changes and its influencing factors in the Three-River Headwaters region using trend analysis, stability analysis, residual analysis, bias correlation analysis and geodetector, etc. The results showed that the overall NPP and the NPP of various vegetation types in the Three-River Headwaters region exhibited an upward trend from 2000 to 2023, with an average growth rate of 1.38 g·m-2·a-1 C. Spatially, it displayed a distribution pattern characterized by higher values in the southeast and lower values in the northwest, with 97.92% of the region experiencing an increase in NPP, and the overall fluctuation remained stable. Vegetation NPP in different areas of the Three-River Headwaters region exhibited varying response patterns to temperature and precipitation, although temperature exerted a more significant impact on vegetation NPP in this region. Both climate change and human activities had positive effects on vegetation NPP in the Three-River Headwaters region, and the impacts of human activities on vegetation NPP were both positive after 2018. In Factor-detector detection, the average explanatory power of altitude and temperature exceeded 50%, while precipitation, land use, and population also demonstrated over 50% explanatory power in interaction-detector.

Key words: MODIS NPP, The Three-River Headwaters, Spatiotemporal evolution, Influencing factors

摘要: 明晰三江源地区植被NPP变化的现状和驱动力,可为未来植被恢复和生态工程的动态调整提供科学依据和决策参考。本研究基于MODIS NPP数据,采用趋势分析、稳定性分析、残差分析、偏相关分析及地理探测器等方法,分析了三江源地区植被NPP变化及影响因素。结果表明:2000—2023年,三江源地区总体NPP和各植被类型NPP均呈增加趋势,整体增速为1.38 g·m-2·a-1 C,在空间上呈东南部高西北部低的分布格局,其中97.92%的区域为NPP增加区,整体波动情况稳定。三江源地区不同区域植被NPP与气温和降水具有不同的响应关系,但气温对该地区植被NPP的影响更大。气候变化和人类活动对三江源地区植被NPP的影响均表现为正向影响,其中人类活动对植被NPP的影响在2018年以后均表现为正向影响。单因子探测中海拔和气温的平均解释力在50%以上,但较单因子探测而言,交互探测中降水、土地利用以及人口的解释力也均在50%以上。

关键词: MODIS NPP, 三江源地区, 时空演变, 影响因素

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