摘要
沙尘对环境的污染被人们越来越重视,是生态环境研究的重要组成部分,本文对哈尔滨城市不同类型松散地表土进行了采样和物质组成特征进行了较全面的研究。结果表明:河床冲积物和哈尔滨市土壤对哈尔滨沙尘天气的贡献较小;而地表裸土的粒度和化学组成特征指示了道路裸土和建筑土是哈尔滨沙尘天气主要的物质源地,可以为沙尘天气提供大量的粉尘物质。这不仅对哈尔滨沙尘研究提供了基础资料,也对确定哈尔滨沙尘来源区并科学控制沙尘暴提供了一定的理论依据。
Different kinds of surface sediments are distributed in main roads of each urban area of Harbin, which include road bare soils, river alluvial deposits, softs, building softs and so on. These surface sediments were sampled on the basis of an analysis of their grain sizes and chemical composition. The results show that there exist plenty of coarse-grained components （〉63um） in riverbed alluvial deposits but less fine-grained components of silt and clay, and hence the latter have exerted relatively insignificant influence on the sand-dust weather of Harbin. Although there exist certain amounts of fine-grained materials in soils, they fail to participate in the sand-dust weather under the action of wind power because of the vegetation cover and the cohesion between soft particles. The road bare softs and building softs with large amounts of fine-grained materials that are liable to be transported for a long distance have similar chemical composition and chemical weathering features to sand-dust deposits in Harbin. Characteristics of grain sizes and chemical composition indicate that road naked soft and building soft constitute important material sources for sand-dust weather in Harbin in that they can supply sand-dust weather with a large amount of silt-dust materials. It is considered that it is the city building soft and road naked soft with large amounts of fine particles that exert a remarkable influence on the dust-sand weather in Harbin, and that the control of the loose earth surface naked soft is the key to the prevention of the dust-sand weather in Harbin.
出处
《中国地质》
CAS
CSCD
北大核心
2009年第2期474-481,共8页
Geology in China
基金
国家自然科学基金项目(40771195)
黑龙江省自然科学基金项目(G200803)
哈尔滨师范大学青年学术骨干资助计划项目(08KXQ-02)共同资助。
关键词
物质组成
沙尘天气
地表土
哈尔滨
material composition
sand-dust weather
surface soft
Harbin
