摘要
10年来北京地区风沙活动大幅度减少。与1980年以前的多年平均值比较1991—1992年北京地区10站平均大风日数只有34％,风沙日数为21.9％。风沙日下降的原因主要是地面绿化后就地起沙迅速减少。但如果上风地区绿化工作不跟上,还会影响北京的风沙活动。
There was a ohvious decrease of sand and wind activities during the last tne years in beijing. The average windy days and the sand-driving wind days from 1991 to 1992 were 34% and 21. 9% respectively as compared with the multi-year average values before 1980. The reason of decrease of sand-driving wind days was that the sand producted in Beijing area itself decreased because of a better- green-layer above land . But if the greening-work in the upper-reach of wind area delays, it will have aimpact on the sand and wind activities in Beijing.
出处
《地理研究》
CSSCI
CSCD
北大核心
1993年第4期81-84,共4页
Geographical Research
