中国北方农牧交错带全新世环境演变的若干特征

我国北方农牧交错带是环境变化的敏感地区之一.全新世以来,根据本区的沙地形成、演化和湖泊演化对比,得知近1万a来有过四五次较大的气候波动;自3000a以来干湿频率有加强的趋势。本地带具有准2000a周期及准22、准38、准83、准102和准400a周期,为预测未来环境变化提供依据,为制定开发规划时参考。

ON CHARACTERISTICS OF HOLOCENE ENVIRONMENTAL VICISSITUDES OF AGRO-ANIMAL HUSBANDRY TRANSITIONAL ZONE IN NORTH CHINA

the agro-animal husbandry transitional zone in North China is one of the regions sensitive to environmental variations. Based on the formetion and evolution of deserts in this region and erolution comparison of lake basins since Holocene, it is conduded that there have been 4,5 obvious climatic fluctuations in recent ten thousand years, and that the frequency of arid-humid changes has trended to enhance since 3000year B. P. There exists a quasi-2000year cycle with quasi-22year, quasi-36year, quasi-83 year, quasi-102 year and quasi-400year cycles in this region, thus providing both sciertific bases for forecasting coming onvironmental vicissi-tudes and reference data for formulating developmental programs.