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中国北方表土微团粒粒度分布及其对粉尘释放通量的影响 被引量:11

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摘要 利用干筛筛析法测定了中国北方沙漠、戈壁、绿洲、干草原农垦区和草原牧区等代表性表土(沙质土、砾质沙土、砾质壤土、壤土和粉壤土等)的微团粒粒度分布.组成表土微团粒粒度分布的对数正态群体分别为粉细沙、细沙、中沙、粗沙和极粗沙群体,其平均的质量中值粒径分别为90,210,390,600和980μm,平均的标准偏差分别为1.25,1.40,1.25,1.35和1.25.粉细沙、细沙、中沙、粗沙、砾质沙、砾质壤土、壤土等表土类型的微团粒粒度分布为这几个对数正态分布群体中的组合.粉尘释放模型(DPM模型)模拟的结果显示:表土微团粒粒度分布对粉尘释放通量存在显著影响,细沙和粉细沙的粉尘释放通量最大,中沙、砾质沙、砾质壤土、壤土、粉壤土次之,粗沙的粉尘通量最小,差值范围在10^1~10^3μg·m^-2·s^-1左右;中国北方沙漠(沙地)和片状流沙覆盖的农田的粉尘释放通量在10^1~10^4μg·m^-2·s^-1之间,而沙砾质戈壁、沙砾质化的农田和草原的粉尘释放通量在10^1~10^2μg·m^-2·s^-1之间,表明中国北方沙漠(沙地)和片状流沙覆盖的农田是粉尘释放的主要源地。
出处 《科学通报》 EI CAS CSCD 北大核心 2004年第17期1776-1784,共9页 Chinese Science Bulletin
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