植物生态学报 ›› 2009, Vol. 33 ›› Issue (2): 246-253.DOI: 10.3773/j.issn.1005-264x.2009.02.002

• 研究论文 • 上一篇    下一篇

泾河流域植被覆盖时空演变及其与降水的关系

齐清(), 王天明, 寇晓军, 葛剑平()   

  1. 北京师范大学生命科学学院景观生态与可持续性科学研究中心,北京 100875
  • 收稿日期:2008-06-02 接受日期:2008-08-22 出版日期:2009-06-02 发布日期:2009-03-31
  • 通讯作者: 葛剑平
  • 作者简介:* E-mail: gejp@bnu.edu.cn
  • 基金资助:
    “十一五” 科技支撑项目 “林业生态建设关键技术研究与示范”(2006BAD03A0206);国家自然科学基金(40730631)

TEMPORAL AND SPATIAL CHANGES OF VEGETATION COVER AND THE RELATIONSHIP WITH PRECIPITATION IN JINGHE WATERSHED OF CHINA

QI Qing(), WANG Tian-Ming, KOU Xiao-Jun, GE Jian-Ping()   

  1. College of Life Sciences & Centre for Landscape Ecology and Sustainability Science, Beijing Normal University, Beijing 100875,China
  • Received:2008-06-02 Accepted:2008-08-22 Online:2009-06-02 Published:2009-03-31
  • Contact: GE Jian-Ping
  • About author:First author contact:

    E-mail of first author: qiqing27@163.com

摘要:

在当前全球变化和人类活动剧烈影响下, 研究黄土高原植被覆盖的发展趋势及其与主要限制因子的关系, 对黄土高原退化生态系统的恢复和区域生态环境评价有着重要意义。我们利用GIMMS-NDVI数据和长期降雨数据, 对黄土高原中部泾河流域22 a的植被覆盖时空演变及其与降水的关系进行了研究。结果表明, 1)1982~2003年, 泾河流域植被覆盖整体呈微弱的增加趋势, 并在空间上表现出一定差异。植被覆盖增加的地区约69.62%, 其中显著增加的地区16.61%, 主要分布在泾河流域的中西部和下游小流域, 显著下降的地区约1.65%, 主要分布在泾河流域上游及周边地区; 2) NDVI与降水极显著相关。年NDVI随年降水服从对数分布, 生长季(4~11月)NDVI比降水滞后1个月; 3) 泾河流域降水利用效率不稳定变化, 土地退化状况未见有效改善, 并且泾河流域降水利用效率随降水量的增加而降低, 值得探索。

关键词: 植被覆盖, NDVI, 降水, 降水利用效率, 泾河流域

Abstract:

Aim Vegetation and environmental degeneration from global change and intensive human activities are among the most serious problems on the Loess Plateau of China. Our objective was to study the trend in vegetation cover and its relationship with dominant environmental factors to provide a basis for ecological restoration and regional assessment on the Loess Plateau.

Methods We analyzed the temporal and spatial changes of vegetation cover and its relationship with rainfall in the Jinghe Watershed using the GIMMS-NDVI time series data and rainfall data for 1982-2003.

Important findings Annual NDVI slightly increased during the study period and varied spatially. Vegetation cover increased 69.2%, of which the 16.61% of the study area in the middle-west and lower reach of the watershed had a significant increase of vegetation cover. NDVI strongly decreased in the upper reach and the surrounding area, which accounts for 1.65% the whole watershed.NDVI was highly correlated with precipitation, and annual NDVI and annual rainfall had logarithmic distributions. There was a one-month lag of monthly NDVIafter rainfall in the growing season. Rain use efficiency (RUE) decreased during the study period, which indicated lack of improvement of the land situation. Our finding that RUE decreased with increased precipitation contrasts with previous research.

Key words: vegetation coverage, NDVI, precipitation, rainfall use efficiency (RUE), Jinghe Watershed