测绘通报 ›› 2025, Vol. 0 ›› Issue (7): 118-125.doi: 10.13474/j.cnki.11-2246.2025.0719

• 技术交流 • 上一篇    下一篇

基于MODIS数据的青藏高原草地物候变化特征及其月际滞后效应

屈鹏1,2,3, 李真1,3, 王君艳1,3, 高玉峰1,3, 康鸿杰4   

  1. 1. 甘肃省基础地理信息中心, 甘肃 兰州 730000;
    2. 甘肃省国土空间规划研究中心, 甘肃 兰州 730000;
    3. 甘肃省自然资源卫星应用技术中心, 甘肃 兰州 730000;
    4. 甘肃省自然资源规划研究院, 甘肃 兰州 730000
  • 收稿日期:2024-10-29 发布日期:2025-08-02
  • 作者简介:屈鹏(1983—),男,硕士,高级工程师,主要从事空间数据处理与信息挖掘工作。E-mail:qupengdafu@163.com
  • 基金资助:
    甘肃省自然资源厅科技创新项目(202408);甘肃省科技计划(22JR5RA602)

Phenological changes and monthly lag effects of grasslands on the Tibetan Plateau based on MODIS data

QU Peng1,2,3, LI Zhen1,3, WANG Junyan1,3, GAO Yufeng1,3, KANG Hongjie4   

  1. 1. Geomatics Center of Gansu Province, Lanzhou 730000, China;
    2. Gansu Land and Space Planning Research Center, Lanzhou 730000, China;
    3. Gansu Technology Center of Natural Resources Satellite Application, Lanzhou 730000, China;
    4. Gansu Natural Resources Planning Academy, Lanzhou 730000, China
  • Received:2024-10-29 Published:2025-08-02

摘要: 青藏高原植被物候变化对全球气候变化背景下陆地生态系统碳收支平衡发挥了重要作用。但目前针对该区域单月气候变化对物候滞后影响研究尚显不足。因此,本文以遥感数据MODIS (MOD13A2) NDVI为数据源,采用动态阈值法反演2000—2023年青藏高原草原植被物候变化。结果显示:①青藏高原降水和气温变化具有明显地带性规律,降水西低东高;气温整体呈西低东高趋势。②第111~192 d为返青期SOS发生的主要时间范围,占总面积的61.21%;第227~283 d为EOS发生的主要时间范围;LOS主要发生时间集中在第92~233 d。③2月气温与SOS正相关区域占比例最高,为55.96%; EOS与7—11月气温相关性表现为:越靠近11月,正相关区域面积越大,其中10月气温与EOS正相关面积达78.79%。主要结论为:①青藏高原SOS在2000—2023年整体呈提前趋势,而EOS则表现出推迟趋势。②SOS与生长季前期2月降水负相关,EOS与生长季末期8月降水正相关。

关键词: 青藏高原, 物候变化, 年均温, 年降水, 滞后效应

Abstract: Vegetation phenological changes in the Tibetan Plateau play an important role of global climate change. However, the study on the effects of climate change on phenology in this region is still insufficient. Therefore, in this study, remote sensing data MODIS (MOD13A2) NDVI was used as the data source to invert vegetation phenological changes in Tibetan Plateau grassland from 2000 to 2023. The results show that: ①The variation of precipitation and temperature over the Tibetan Plateau has obvious zonal regularity, with precipitation lower in the west and higher in the east; The overall temperature shows a trend of low in the west and high in the east. ②The 111~192 days are the main time range of SOS occurrence, accounting for 61.21% of the total area. ③In February, the positive correlation between air temperature and SOS is the highest, 55.96%. The main conclusions are as follows: ①The SOS of the Tibetan Plateau shows an overall advance trend during 2000—2023, while the EOS shows a delayed trend. ②SOS is negatively correlated with precipitation in February in the early growing season, while EOS is positively correlated with precipitation in August in the late growing season.

Key words: Tibetan Plateau, phenomenon change, annual mean temperature, annual precipitation, lag effect

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