论气候在西非萨赫勒地带荒漠化中的作用──兼谈近期人类活动的影响

ON THE EFFECT OF CLIMATE ON DESERTIFICATION IN SAHEL,WEST AFRICA──With Diccussion on the Effect of Human Activities

西非萨赫勒地带是世界上最严重的荒漠化地区．本文论述了气候在其荒漠化中的作用这一理论问题．文中提出，不能简单化和绝对化地看待这个问题．气候在该地带荒漠化中的作用具有复杂性．既有直接作用，又有间接作用；既能单独起作用，又能与人类过度经济活动因素结合在一起发挥巨大的作用．但从总体上看．近几十年来该地带的迅速荒漠化．主要是人类过度经济活动的结果．

Sahel in West Africa is the most serious desertified zone in the world. In the paper, the effect of climate on the desertification in sahel is discussed, which is one of the major queshons in the study of desertification, and quite complicated including both direct and indirect ones. Climate can play a role in the desertification in the zone, individually, or in conjunction with cxcessive human economic activities. To view the rapid desertification in the zone over last several decades as a whole, however, it is mainly caused by excessive human economic activities.