Relationship between vegetation coverage and spring dust storms over northern China
Relationship between vegetation coverage and spring dust storms over northern China
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DOI：
10.1029/2003jd003913
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发表时间：
2004-02
影响因子：
--
通讯作者：
X. Zou;P. Zhai
中科院分区：
文献类型：
--
作者：
X. Zou;P. Zhai
[1]利用1982 ~ 2001年归一化植被指数（NDVI）资料和中国沙尘暴观测资料，探讨了北方植被与春季沙尘暴的关系。结果表明，北方植被覆盖度低是春季沙尘暴频繁发生的重要因素。此外，植被覆盖对沙尘暴的年际变化也起着重要作用。1982-2001年春季北方地区植被覆盖度与沙尘暴发生呈负相关。植被覆盖度与沙尘暴影响面积的相关系数为-0.59，在99%置信水平下具有统计学意义。近年来春季植被覆盖度的急剧减少是2000 - 2001年北方春季沙尘暴频繁的主要原因之一。在中国北方东部，主要是内蒙古中东部，负相关性尤为显著。当植被减少（增加）时，沙尘暴的发生增加（减少）。此外，统计数据显示，前几个季节丰富的植被有助于减少来年春天的沙尘暴。前夏植被对春季沙尘暴变化的影响在北方中东部尤为明显。由于西北荒漠区植被稀少，春季沙尘暴发生的变化似乎与植被无关。
[1] On the basis of normalized difference vegetation index (NDVI) data from 1982 to 2001 and dust storm observations in China the relationship between vegetation and spring dust storms over northern China is discussed. The results show that poor vegetation coverage in northern China is one important factor for the frequent occurrence of spring dust storms. In addition, vegetation cover plays an important role in interannual variations of dust storms. In general, a negative correlation is noted between vegetation coverage and occurrence of dust storms in northern China for spring during the period 1982–2001. The correlation coefficient between vegetation coverage and areas affected by dust storms is −0.59, which is statistically meaningful at 99% confidence level. The sharp decrease of spring vegetation coverage in recent years is one of the major contributors to frequent spring dust storms over northern China specifically during 2000 and 2001. A negative correlation is especially significant in the eastern part of northern China, mainly in central and eastern Inner Mongolia. When vegetation decreases (increases), the occurrence of dust storms increases (decreases). Furthermore, statistics show that abundant vegetation in previous seasons could help reduce dust storms in the coming spring. The effect of prior summer vegetation on the variation of spring dust storms is particularly evident in the central and eastern part of northern China. Because of the presence of little to no vegetation in the desert areas of northwest China the variation in occurrence of spring dust storms seems unrelated to the vegetation.