农业工程学报2012，Vol.28Issue(11)：138-145,8.DOI:10.3969/j.issn.1002-6819.2012.11.023
民勤荒漠-绿洲过渡带不同下垫面条件的土壤风蚀特征
Characteristics of aeolian sediment under different underlying surfaces in oasis-desert transitional region of Minqin
摘要
Abstract
Based on the practical observation materials of three sand storms in Minqin county, the characteristics of aeolian sediment under different underlying surfaces in the oasis-desert transitional region of this area were studied. The sand storms were occurred on April 19, 22 - 23 and 30 in 2009. The results showed that the upper segment of the sediment discharge line of the vertical distribution fit in with exponential rule, and the real sediment near the soil surface (beneath 35 cm) was larger than that of calculated with the exponential function. 90% sediment discharge of the sand surface was beneath 15 cm. 80% sediment discharge of soil surfaces with Nitraria bushes, straw checkerboard barrier and reed were in the height of 35 cm from the soil surface. The effects of underlying surface with different conditions on sediment particles diameter mainly focus on the near surface at 15 cm range from soil surface, and the effects on the particle size of aeolian sediment at 35 cm to 125 cm range mainly focus on the percentage of different particles. The straw checkerboard barrier is a best way for reducing the wind erosion, which can lower the sediment transport capacity of wind. The function of soil surface with Nitraria bushes takes the second place, and the soil surface with reeds is the third. The surface covered by sand has the biggest sediment discharge.关键词
土壤/侵蚀/泥沙输移/荒漠-绿洲过渡带/下垫面/输沙量/风蚀物粒径Key words
soils, erosion, sediment transport, oasis-desert transitional region, underlying surface, sediment discharge, aerolian sediment particle size分类
农业科技引用本文复制引用
王萍,王燕..民勤荒漠-绿洲过渡带不同下垫面条件的土壤风蚀特征[J].农业工程学报,2012,28(11):138-145,8.基金项目
国家重点基础研究发展计划(No.2009CB421304),教育部科学研究重大项目(308022)、兰州大学"中央高校基本科研业务费专项资金"(lzujbky-2009-k01,lzujbky-2009-110) （No.2009CB421304）
