西藏那曲地区植被覆盖状况与气象条件分析

Relation of vegetation coverage to meteorological conditions in the Naqu area of Tibet

本研究利用2004和2005年4-10月极轨气象卫星的AVHRR逐月归一化植被指数资料和同期西藏那曲地区气候资料,分析研究了该区域内的草原、草甸、灌丛植被覆盖特征以及长势与气候因子间的相关关系。结果表明,不同区域植被覆盖度、长势与降水、气温因子有显著的正相关关系,植被覆盖度越低,对降水的依赖性越强,那曲东部各等级植被覆盖面积与温度和累积降水的相关系数都大于中部和西部。

With monthly AVHRR/NDVI datasets of orbital meteorological satellite from 2004 to 2005 during A pril-October, along with climate data from the Naqu area in Tibet, this paper investigated the feature of different vegetation types such as grassland, meadow, and shrubs in the above area and the relationship between vegetation coverage and meteorological factors. Vegetation coverage and the method of crop growing have obvious positive relationships with precipitation and temperature in different parts of this area. The lower the vegetation coverage, the stronger the dependence on precipitation. The correlation efficient of vegetation coverage to precipitation/temperature is larger at the eastern part of Naqu with a different classification comparing the middle and west parts.