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Monsoon variation and vegetative drought patterns in the Luni Basin in the rain-shadow zone

机译：雨影带鲁尼盆地季风变化与植物干旱模式

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摘要

Drought has a significant impact on agricultural, ecological and socio-economic spheres. Poor and delayed monsoon, high temperature and insufficient water resources lead to recurrent drought in the Luni River basin located in the rain-shadow zone of western India. In the present study, monsoon variation was studied in relation to spatio-temporal patterns of vegetative drought in the Luni Basin. The Vegetation Condition Index, the Temperature Condition Index and the Vegetation Health Index derived through multi-channel data of NOAA AVHRR satellite were used for drought monitoring, and seasonal variation in rainfall and vegetation response were analysed, compared and correlated. The study finds inconsistent and erratic rainfall patterns in the Luni Basin. The monsoon variation was found to control vegetation health during the monsoon season but sometimes in the non-monsoon period too, and vegetative drought intensity and duration vary widely depending upon moisture and thermal stresses. Inertia in vegetation health is reflected in the inter-seasonal persistence of vegetative drought conditions. The study finds that a good monsoon helps in maintaining vegetation health during following seasons. On the contrary, vegetation health is found to be more sensitive to moisture and thermal stresses in the immediate season after a drought.
机译：干旱对农业，生态和社会经济领域具有重大影响。季风恶劣和延迟，高温和水资源不足导致位于印度西部雨影区的鲁尼河流域反复干旱。在本研究中，研究了鲁尼盆地季风变化与植物干旱时空格局的关系。通过NOAA AVHRR卫星多通道数据得出的植被状况指数，温度状况指数和植被健康指数用于干旱监测，并分析，比较和关联了降雨和植被响应的季节变化。该研究发现卢尼盆地的降雨模式不一致且不稳定。人们发现季风变化可以控制季风季节的植被健康，但有时在非季风季节也是如此，而植物干旱的强度和持续时间则因水分和热应力而有很大差异。植被健康的惰性反映在植物干旱条件的季节间持久性上。研究发现，良好的季风有助于在接下来的季节中维持植被健康。相反，发现干旱后不久的季节，植被健康对水分和热应力更加敏感。

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  • 来源
    《International journal of remote sensing》 |2010年第12期|P.3223-3242|共20页
  • 作者

    C. BHUIYAN; rnF. N. KOGAN;

  • 作者单位

    School of Environmental Studies, University of Delhi, Delhi 110007, India;

    rnNational Environmental Satellite Data and Information Service, National Oceanic and Atmospheric Administration, Camp Springs, MD, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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