自然资源学报 ›› 2019, Vol. 34 ›› Issue (3): 624-632.doi: 10.31497/zrzyxb.20190315

• 资源评价 • 上一篇    下一篇

塔里木河下游区域植被时空变化

高庆1,2(), 艾里西尔·库尔班1(), 肖昊1,2   

  1. 1. 中国科学院新疆生态与地理研究所,乌鲁木齐 830011
    2. 中国科学院大学,北京 100049
  • 收稿日期:2018-07-03 修回日期:2018-10-25 出版日期:2019-03-28 发布日期:2019-03-28
  • 作者简介:

    作者简介:高庆(1989- ),男,安徽阜阳人,硕士,主要从事遥感应用研究。E-mail: gaoqing215@mails.ucas.ac.cn

  • 基金资助:
    国家自然科学基金项目(31570536)

Spatiotemporal variation of vegetation in the lower reaches of Tarim River

GAO Qing1,2(), ALISHIR Kurban1(), XIAO Hao1,2   

  1. 1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-07-03 Revised:2018-10-25 Online:2019-03-28 Published:2019-03-28

摘要:

为了对比生态输水工程实施前后塔里木河下游植被变化,分析植被对生态输水的时空响应,基于1986-2017年研究区上方无云的22期Landsat NDVI数据,辅以波动分析、趋势分析,探索研究区植被的时空变化特征,并对其驱动因素进行分析。结果表明:(1)空间上,植被的分布与水资源的分布密切相关,主要沿河道和积水区域分布。(2)1986-2000年,NDVI呈现缓慢下降趋势,2000-2017年NDVI总体呈现波动增加趋势;植被对生态输水有一定的滞后性,且与输水量密切相关。(3)研究区NDVI时间序列的方差介于0.0077~0.1957间,存在明显的空间差异,其波动的大小与植被种类密切相关。(4)1986-2000年,植被的NDVI空间趋势以减小为主,并主要发生在英苏和老英苏附近;2000-2017年,植被的NDVI空间趋势以增加为主,且主要发生在沿河道区域和喀尔达依东侧。

关键词: 时间序列, 塔里木河下游, 植被变化, Landsat NDVI, 时间序列, 塔里木河下游

Abstract:

To examine the spatiotemporal variation of vegetation in the lower reaches of the Tarim River, in this study, we use the cloud-free data of Landsat 5 TM and Landsat 8 OLI to obtain 22 time-series NDVI data during the period 1986-2017. We use the standard deviation of the NDVI time series to reflect vegetation change and the slope of linear regression equation of NDVI time series to reflect the variation tendency of vegetation. The results show that: (1) The distribution of vegetation is closely related to the distribution of water resources, mainly along the river channel and the water logged area. (2) For 1986-2000, the average NDVI value in the range within 1 km from the river channel fluctuated around 0.055, and showed a trend of slow decline because of the long-term absence of water supply. For 2000-2017, the average NDVI value showed an increasing trend and its fluctuation was closely related to volume and allocation of ecological water transportation. (3) The variance of NDVI time series in the study area was between 0.0077-0.1957, and there was obvious spatial difference. Its fluctuation was closely related to vegetation species. (4) The vegetation was in decline, which mainly occurred in the vicinity of Yingsu and old Yingsu during 1986-2000, but the vegetation mainly presented an increasing trend, and occurred mainly in the area along the river and east of Ka'erdayi during 2000-2017.

Key words: vegetation change, Landsat NDVI, time-series, lower reaches of the Tarim River, vegetation change, Landsat NDVI, time-series, lower reaches of the Tarim River