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中国科学院大学学报 ›› 2023, Vol. 40 ›› Issue (6): 735-742.DOI: 10.7523/j.ucas.2022.033

• 环境科学与地理学 • 上一篇    下一篇

基于空间异质性的库鲁斯台草地退化

高梓茜1,2, 包安明1,3, 郑国雄1,2, 黄晓然1,2, 于涛1,2, 刘铁1,3   

  1. 1. 中国科学院新疆生态与地理研究所 荒漠与绿洲生态国家重点实验室, 乌鲁木齐 830011;
    2. 中国科学院大学, 北京 100049;
    3. 中国科学院-巴基斯坦高等教育委员会 中国-巴基斯坦地球科学研究中心, 伊斯兰堡 45320
  • 收稿日期:2021-12-09 修回日期:2022-04-06 发布日期:2022-04-26
  • 通讯作者: 包安明,E-mail:baoam@ms.xjb.ac.cn
  • 基金资助:
    王宽诚教育基金会(GJTD-2020-14)资助

Grassland degradation assessment based on spatial heterogeneity in Kulusitai

GAO Ziqian1,2, BAO Anming1,3, ZHENG Guoxiong1,2, HUANG Xiaoran1,2, YU Tao1,2, LIU Tie1,3   

  1. 1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. China-Pakistan Joint Research Center on Earth Sciences, CAS-HEC, Islamabad 45320, Pakistan
  • Received:2021-12-09 Revised:2022-04-06 Published:2022-04-26

摘要: 以库鲁斯台草原为研究区,基于1990—2020年Landsat数据,选择归一化植被指数(NDVI)及空间异质性作为草地退化的遥感监测指标,对库鲁斯台草地退化状况进行评估。结果表明:1)1990—2020年,研究区中部NDVI呈上升趋势,而边缘区域呈下降趋势;草地空间异质性上升的区域主要集中在研究区中部及西南部地区,北部和南部则以下降为主。2)草地退化的监测表明,约54%的草地出现退化,35%的草地得到了改善,10%的草地植被恢复。3)温度和降水对草地空间异质性的年际变化影响较小,对NDVI影响较大,降水量是影响库鲁斯台草原NDVI时间动态的主要因素。

关键词: 草地退化, 遥感, NDVI, 空间异质性, 库鲁斯台草原

Abstract: Based on Landsat data from 1990 to 2020, this study used the normalized difference vegetation index (NDVI) and spatial heterogeneity as indicators to monitor the grassland degradation in Kulusitai. The results showed that:1) During the study period, the NDVI in the central part of the study area exhibited an increasing trend, while the marginal area showed a decreasing trend. The spatial heterogeneity of grassland increased in the central and southwestern areas and decreased in the northern and southern areas. 2) About 54% of the grassland in the Kulusitai was degraded at different levels, 35% of grassland was improved and 10% of grassland showed regrowing conditions. 3) Temperature and precipitation had little influence on interannual variation of spatial heterogeneity. However, they showed significant impacts on NDVI yearly dynamics, in which precipitation was the dominant climate factor.

Key words: grassland degradation, remote sensing, NDVI, spatial heterogeneity, Kulusitai Grassland

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