营造常绿针叶林,减弱沙暴侵袭

沙尘暴是强风与下垫面作用的结果.在足够的风力造成不同范围和强度的沙尘暴大气过程中,对沙尘暴源区、路径区域、沙尘物质、不同产生规律、供给量进行重点分析探讨,提出以地球空间下垫面植被为主要研究对象,即认为植被覆盖度、类型、植物生长季相等同自然气象因素相互作用,对沙尘暴发生发展有制约的作用.我国北方干旱、半干旱地区,特别是在长城以北农牧交错带大面积的落叶林分结构简单,植被覆盖度低而近地面抗风能力差,尤其在落叶季节地面多为裸露,加之降水少,土壤含水量低,干燥松散,西北风强烈,沙尘迭起,造成沙尘暴大气频繁发生.因地制宜,在原有的基础上增加和发展常绿针叶林的营造,减少就地起沙（尘）,提高抗风降沙尘能力,是减弱沙尘暴侵袭的有效途径.

Development of Evergreen Conifer Forest to Reduce the Encroachment by Sandstorm

Sandstorm is a co-effect of the strong wind interacting with the surface of the earth. In this paper, sandstorm in terms of its initial area, movement paths, ingredients, formation and quantities of supply are discussed and explored. It is believed that the vegetation as the main object of research exerts a restrictive roles in the formation of sandstorm. The north dry, semi-dry area, especially, the broad-leaved stands with simple structure in the large mixed area for agriculture and livestock raising north of Great Wall, are weak in resisting sandstorm and together with the lack of rainfall, are subject to frequent sandstorms. One effective solution is, with full consideration of the local conditions, to develop evergreen conifer forest to enhance the ability of wind resistance so as to cease the sands (dusts) floating in the air.