Amount of Spring Dustfall and Its Environmental Significance in East Part of Northern China
Amount of Spring Dustfall and Its Environmental Significance in East Part of Northern China
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发表时间：
2008
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通讯作者：
Wang Xun-ming
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作者：
Wang Xun-ming
对华北东部2 8个测点2 0 0 1年~2 0 0 2年春季降尘的分布特征进行了分析，结果表明：春季降尘主要发生在3、4月份，降尘量为127.05 t-5 km-2，约占全年降尘量的5 0%；春季降尘主要来自局地区域，降尘空间分布主要受局地下垫面特征控制；除中沙外，总降尘量和不同粒级降尘量随距离呈指数下降，其半衰减距离随粒径增大而减小；中国黄土高原的黄土在更新世时的损失率约为1×108t·a-1，今天约为14.4×108t·a-1，如果以这样的侵蚀速度计算，黄土高原将在66000年至13.2万年后消失。
The distribution characteristics of spring dustfall during 2001-2002 at 28 sites are analyzed in the east part of Northern China.The results show that the spring dustfall occur mainly in March and April with the amount of 127.05 t\5km-2,occupying about 50% of the whole year dustfall;Spring dustfall are mainly from local region source,so the spatial distribution of dustfall is controlled mainly by the character of local underlying surface;Except for medium sand,the total dustfall and the amount of different grain size decrease exponentially with distance,and their \!half-attenuation distance\" decrease with the increase of grain size;The loss rate of the loess on China Loess Plateau was about 1×108 t\5a-1 in Pleistocene,today it isabout 14.4×108 t·a-1,and the Loess Plateau would disappear after66 000 to132 000 years if at this erosion rate.