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黄土高原水蚀风蚀交错区退耕还林工程前后NDVI时空变化特征

杨灿 魏天兴 李亦然 郑粮 陈宇轩

杨灿, 魏天兴, 李亦然, 郑粮, 陈宇轩. 黄土高原水蚀风蚀交错区退耕还林工程前后NDVI时空变化特征[J]. 北京林业大学学报, 2021, 43(6): 83-91. doi: 10.12171/j.1000-1522.20210128
引用本文: 杨灿, 魏天兴, 李亦然, 郑粮, 陈宇轩. 黄土高原水蚀风蚀交错区退耕还林工程前后NDVI时空变化特征[J]. 北京林业大学学报, 2021, 43(6): 83-91. doi: 10.12171/j.1000-1522.20210128
Yang Can, Wei Tianxing, Li Yiran, Zheng Liang, Chen Yuxuan. Spatiotemporal variations of NDVI before and after implementation of Grain for Green Project in wind-water erosion crisscross region of the Loess Plateau[J]. Journal of Beijing Forestry University, 2021, 43(6): 83-91. doi: 10.12171/j.1000-1522.20210128
Citation: Yang Can, Wei Tianxing, Li Yiran, Zheng Liang, Chen Yuxuan. Spatiotemporal variations of NDVI before and after implementation of Grain for Green Project in wind-water erosion crisscross region of the Loess Plateau[J]. Journal of Beijing Forestry University, 2021, 43(6): 83-91. doi: 10.12171/j.1000-1522.20210128

黄土高原水蚀风蚀交错区退耕还林工程前后NDVI时空变化特征

doi: 10.12171/j.1000-1522.20210128
基金项目: “十三五”国家重点研发计划课题(2016YFC050170502)
详细信息
    作者简介:

    杨灿。主要研究方向:遥感与GIS技术应用研究。Email:yangcan@bjfu.edu.cn 地址:100083 北京市海淀区清华东路35 号北京林业大学水土保持学院

    责任作者:

    魏天兴,教授,博士生导师。主要研究方向:林业生态工程与流域自然地理过程研究。Email:weitx@bjfu.edu.cn 地址:同上

  • 中图分类号: S157.1

Spatiotemporal variations of NDVI before and after implementation of Grain for Green Project in wind-water erosion crisscross region of the Loess Plateau

  • 摘要: 【目的】探究黄土高原退耕还林工程实施前后植被覆盖变化特征,评估生态修复效果,对于制定更为有效的生态修复战略政策具有重要意义。【方法】该研究以黄土高原水蚀风蚀交错区为研究区,以EOT算法为核心,基于GIMMS NDVI数据集和MODIS NDVI数据集的重叠时期数据,构建1982—2000年1 km分辨率的NDVI数据集(EOT NDVI),并联合MODIS NDVI数据(2001—2019年),形成1982—2019年逐月1 km NDVI数据集(EM NDVI),以探究研究区的NDVI时空动态变化。【结果】(1)EOT算法对GIMMS NDVI降采样应用是合理的,同时期EOT NDVI与MODIS NDVI之间的平均误差(ME)、平均值绝对误差(MAE)、均方根误差(RMSE)均较小,且决定系数(R2)较高;(2)1982—2019年年均NDVI呈现先下降后上升趋势,年均NDVI增长速率为0.007 8;(3)1982—2019年植被增长速率呈现空间异质性,且退耕还林工程实施前(1982—2000年)年均NDVI呈下降趋势的地区是退耕还林工程实施后(2001—2019年)年均NDVI增加趋势显著的地区。【结论】研究成果可为评估生态恢复措施实施效果和未来生态环境建设提供理论依据和数据支撑。

     

  • 图  1  黄土高原水蚀风蚀交错区地理概况

    Figure  1.  Geographical overview of the wind-water erosion crisscross region in the Loess Plateau

    图  2  2007—2009年EOT NDVI和MODIS NDVI

    Figure  2.  EOT NDVI and MODIS NDVI from 2007 to 2009

    图  3  2007—2009年EOT NDVI与MODIS NDVI误差统计

    ME表示平均误差,MAE表示平均绝对误差,RMSE表示均方根误差,r表示相关系数,R2表示决定系数,上下横线表示误差统计极大值和极小值,箱子中部横线表示误差统计中位数,点表示误差统计异常值。ME indicates mean error, MAE indicates mean absolute error, RMSE indicates root mean square error, r indicates correlation coefficient, R2 indicates coefficient of determination, the upper and lower horizontal lines indicate the Max. and Min. values of error statistics, the middle horizontal line of the box indicates the error statistic median, and the dot indicates error statistic outliers.

    Figure  3.  Error statistics of EOT NDVI and MODIS NDVI from 2007 to 2009

    图  4  年均NDVI变化趋势

    Figure  4.  Temporal trends of average annual NDVI

    图  5  1982—2019年UF-UB曲线

    Figure  5.  UF-UB curves from 1982 to 2019

    图  6  1982—2019年年均NDVI空间变化及显著性检验

    Figure  6.  Spatial variations and significance test of average annual NDVI from 1982 to 2019

    图  7  退耕还林工程前后年均NDVI空间变化

    Figure  7.  Spatial variations of average annual NDVI before and after Grain for Green Project

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出版历程
  • 收稿日期:  2021-04-07
  • 修回日期:  2021-04-22
  • 网络出版日期:  2021-06-10
  • 刊出日期:  2021-06-30

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