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中国沙漠 ›› 2018, Vol. 38 ›› Issue (5): 1099-1107.DOI: 10.7522/j.issn.1000-694X.2018.00035

• 生态与经济 • 上一篇    下一篇

2000-2015年毛乌素沙区植被覆盖度变化趋势

郭紫晨1,2, 刘树林1, 康文平1,2, 陈翔1,2, 张雪琴1,2   

  1. 1. 中国科学院西北生态环境资源研究院 沙漠与沙漠化重点实验室, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2017-10-26 修回日期:2018-04-10 出版日期:2018-09-20 发布日期:2018-11-03
  • 通讯作者: 刘树林(E-mail:liusl@lzb.ac.cn)
  • 作者简介:郭紫晨(1993-),女,甘肃高台人,硕士研究生,主要从事沙漠遥感研究。E-mail:245717256@qq.com
  • 基金资助:
    国家重点研发计划课题(2016YFC0500902)

Change Trend of Vegetation Coverage in the Mu Us Sandy Region from 2000 to 2015

Guo Zichen1,2, Liu Shulin1, Kang Wenping1,2, Chen Xiang1,2, Zhang Xueqin1,2   

  1. 1. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-10-26 Revised:2018-04-10 Online:2018-09-20 Published:2018-11-03

摘要: 毛乌素沙区是中国生态安全屏障的重要组成部分,土地沙漠化严重,近年来国家和地方政府实施了一系列生态保护与建设工程。利用2000-2015年MODIS13Q1 NDVI产品、年平均气温、年降水量数据,采用回归分析方法和显著性检验,对毛乌素沙区植被覆盖度变化趋势及其对气温、降水变化的响应进行了分析研究。结果表明:(1)毛乌素沙区植被覆盖度总体由东向西呈减少趋势,大部分区域植被覆盖度在30%以下,沙地腹地依然明显存在极低植被覆盖的流沙区。(2)21世纪以来毛乌素沙区植被覆盖度总体呈增加趋势,但空间差异明显。中东部大部分地区及腹地流动沙带之间植被覆盖度呈显著、极显著增加趋势;西部西鄂尔多斯荒漠草原区植被覆盖度变化不显著;植被覆盖度变化显著或极显著减小的地区极少,呈点状零散分布。(3)毛乌素沙区植被覆盖度对气温和降水响应的敏感性存在空间差异,且存在时滞性差异。东部黄土高原过渡区和西部西鄂尔多斯荒漠草原区植被对降水和气温的响应敏感,植被覆盖度的变化与气温和降水因子呈显著相关关系;毛乌素沙地主体区植被覆盖度变化与当年总降水量和年平均气温相关性不强,但与时滞降水的相关系数显著增大,可能与毛乌素沙地土壤质地和植被类型对降水的分配与利用方式有关。

关键词: 毛乌素沙地, 植被覆盖度, 趋势分析

Abstract: The Mu Us Sandy Region (MUSR) suffering serious desertification was an important component of China's ecological security barriers. In recent years, the state and local governments have implemented a series of ecological protection and construction projects in this region. In this paper, regression analysis were used to analyze change trend of vegetation coverage and its response to temperature and precipitation in the MUSR, based on MODIS13Q1 NDVI time-series data from 2000 to 2015, annual mean temperature and annual total precipitation data. The results showed that:(1) the vegetation coverage tended to decrease from east to west in the MUSR, and it was less than 30% in most areas of the MUSR. The mobile sand dunes with very low vegetation coverage were still obviously present in the hinterland of the MUSR. (2) Since 2000, the vegetation coverage in the MUSR has been increasing generally, but there was obvious spatial difference. The areas with significant or extremely significant increase of vegetation coverage distributed in most regions of the middle-eastern MUSR and those places among shifting-dune belts. The change trend of vegetation coverage in the desert steppe area of.the western Ordos plateau was not significant. The areas with significant or extremely significant decrease of vegetation coverage were very few, scattered in the MUSR. (3) There were spatial and time-delay differences about responses of the vegetation coverage to annual total precipitation and annual mean temperature in the MUSR. The vegetation coverage responses to annual total precipitation and annual mean temperature in the transitional zone of Loess plateau and the desert steppe region in the western Ordos Plateau were very sensitive, because of bigger correlation coefficients between them. Although weak correlation between vegetation coverage change and annual total precipitation or annual mean temperature in the Mu Us Sandy Land, there was significant increase correlation coefficients between vegetation coverage change and time-delay annual total precipitation. This might was related to water redistribution and use means due to different soil textures and vegetation types in the Mu Us Sandy Land.

Key words: Mu Us Sandy Region, vegetation coverage, trend analysis

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