摘要
通过对长安区四府村剖面晚更新世后期黄土样品的粒度分析测定,探讨了沙尘暴活动与土壤颗粒组成的关系及32～10kaBP以来的沙尘暴的活动趋势。结果表明,黄土古土壤序列中粗粉砂含量高和粘粒含量低,反映当时沙尘暴活动强烈,反之,沙尘暴活动弱。冰期沙尘暴活动强主要是冰期降水量少造成的,温度低是次要的。古土壤层S10中的粘粒既包含风尘堆积的原始组分,也包含风化成壤过程中对先前发育的黄土L21改造后的次生组分。32～10kaBP以来,沙尘暴活动具有由弱到强的变化趋势,其中23～10kaBP间活动最强。
According to the grain-size analysis of Loess sample developed in late Pleistocene, we discuss the relationship between the activity of sand-dust storm and grain-size of Loess profile, and know the trend of sand-dust storm activity from 32 ka BP to 10 ka BP. As the result, the content of thick grain reflected the strong period of sand-dust storm activity; on the country, the content of thin grain reflected the sand-dust storm was weak. The sand-dust storm activity was strong during ice age mainly because of the less precipitation but not the low temperature. The form of palaeosol S1 0 is caused by later change of Loess L2 1. The sand-dust storm activity had changing trend from weak to strong from 32 ka BP to 10 ka BP.
出处
《中国沙漠》
CSCD
北大核心
2005年第3期409-411,共3页
Journal of Desert Research
基金
陕西师范大学历史地理国家重点学科项目(SNNUHG04007)
中国科学院黄土与第四纪地质国家重点实验室项目(SKLLQG0411)共同资助
关键词
长安四府村
黄土记录
颗粒成分
沙尘暴
土壤颗粒
灾害性天气
Sifu village in Chang’an
the late Pleistocene
Loess record
grain composition
sand-dust storm
