摘要
本文采取等级式量化方法，以年为时间单位，以灾区大小为基本依据，将上古至民国时期甘宁青地区旱灾史料转化为量化资料，然后对之进行了频次分析、阶段分析和周期分析，发现了甘宁青地区历史旱灾的一些统计规律，它们可为进一步研究和预测预报提供线索与依据。
This paper tries to convert the historical records of droughts in Gansu, Ningxia and Qinghai from the ancient times to the eve of the establishment of the Peopel's Republic of China into the quantitative data by adopting the quantification method of 6 grades.Through the analyses of frequencies and times. stages, and periods, it tries to find out certain laws by statistics. They can be useful for further studies and form a basis for the detection and forecast.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
1994年第2期111-116,共6页
Journal of Lanzhou University(Natural Sciences)
关键词
西北地区
旱灾
统计规律
中国
North-Western China
drought disasters
statistical rules
