NDVI； 植被覆盖度； 时空变化； 动态研究； 河东地区； 甘肃," /> NDVI； 植被覆盖度； 时空变化； 动态研究； 河东地区； 甘肃,"/> 1998—2011年甘肃河东地区NDVI时空变化
干旱区研究

干旱区研究 ›› 2014, Vol. 31 ›› Issue (1): 74-79.

• 生物环境 • 上一篇    下一篇

1998—2011年甘肃河东地区NDVI时空变化

杨尚武，张勃，赵一飞，王强，季定民，周丹   

  1. 1. 西北师范大学地理与环境科学学院, 甘肃 兰州 730070；
    2. 中国科学院国家科学图书馆兰州分馆,甘肃 兰州 730000
  • 出版日期:2014-01-15 发布日期:2014-02-28
  • 作者简介:杨尚武（1989），男，硕士生，主要从事区域环境与资源开发研究.E-mail: yangshangwu.0803@163.com

Spatial and Temporal Variation of [ NDVI in the Hedong Region of Gansu Province during the Period of 1998 to 2011

YANG Shang-wu ,ZHANG Bo,ZHAO Yi-fei,WANG Qiang,JI Ding-min ,ZHOU Dan   

  1. 1. College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China;
    2. Lanzhou Branch of the National Science Library, Lanzhou 730000, China
  • Published:2014-01-15 Online:2014-02-28

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摘要： 基于1998—2011年的SPOT VGTNDVI数据，运用最大化均值法、提取植被覆盖度法和一元线性回归趋势分析法，对甘肃河东地区连续14 a的植被覆盖时空变化特征进行动态研究。结果表明:河东地区植被南多北少。在时间上，整体植被呈缓慢上升趋势，增速为0.028·（10a）-1。其中，前4 a NDVI呈下降趋势，从1998年的0.392下降到 2001年0.314；后10 a NDVI呈波动上升趋势，从2002年的0.330上升到2011年的0.378。在空间上，陇南山区中北部、陇中高原南部植被呈增加趋势；而陇东高原东南部、甘南草原区则有所下降。

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Abstract: Based on the SPOT VGTNDVI data during the period from 1998 to 2011, in this paper the spatial and temporal variation of vegetation coverage in the Hedong region of Gansu Province was systematically studied using the NDVI average method, retrieval of vegetation coverage and linear regression trend analysis. The results show that the NDVI in the north of the Hedong region was lower than that in the south. Temporally, NDVI in the study area in recent 14 years was holistically in an increase trend with an increase rate of 0.028·(10a-1). In which it was decreased in the first 4 years (from 0.392 in 1998 to 0.314 in 2001); in the later 10 years, it was increased in a fluctuation way (from 0.330 in 2002 to 0.378 in 2011). Temporally, NDVI in recent 14 years was in an increase trend in the northerncentral mountainous region in south Gansu Province, southern parts of the central Gansu Plateau, but it was in a certain decrease in the southeast of the east Gansu Plateau and the grasslands in south Gansu Province.