A Record of Drought and Flood Series by Tree-Ring Data in the Middle Section of Qilian Mountain Since 904 A.D.
A Record of Drought and Flood Series by Tree-Ring Data in the Middle Section of Qilian Mountain Since 904 A.D.
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发表时间：
2003
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通讯作者：
K. Xing
中科院分区：
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作者：
K. Xing
标准化（STD）年代学是根据祁连山中部的普氏圆柏树轮数据建立的。分析树木年轮指数与树木年轮采样附近气象站降水量之间的相关性。结果表明，近1 100年来，干旱期有31次，湿润期有30次，其中最长的干旱期是公元1540年1590年，持续了6o年；最长的湿润期是公元1240年1270年和公元1860年1890年，分别持续了40年。 10年以上枯水期17次，10年以上丰水期12次。从世纪时间尺度来看，16世纪是100年干旱，80年缺雨。 13世纪和19世纪一样，有100年的潮湿期，有60年的暴雨期。同时，这些山区降水变化的另一个特点是变化较为突变。自公元904年以来，已发生过35次突变，平均时间约为30年。其中由旱转湿16次，由湿转干旱19次。 11世纪有9次突变，15、16世纪有2次突变。 20世纪发生了3次突变。这些山脉的降水量在11世纪变化频繁，在15、16世纪变化较小。 20世纪降水量变化频繁。
The standardized (STD) chronology was established from tree\|ring data of Sabina Przewalskii in the middle part of the Qilian Mountains. The correlation was analyzed between the tree\|ring index and the precipitation in weather stations, near which the tree ring is sampled. The results showed that there were 31 dry spells and 30 wet spells in the past \{1 100\} years, of which 1540\_1590 A.D. was the longest dry period, lasting 6o years, and 1240\_1270 A.D. and 1860\_1890 A.D. were the longest wet periods, lasting 40 years respectively. There were 17 durations of dry period over 10 years, and 12 durations of wet period over 10 years. With regard to the century time scale, the 16th Century was 100 years of drought, with 80 years being lack of rain. The 13th Century, as well as the 19th Century, was 100 years of wet, with 60 years in spate. At the same time, another characteristic of precipitation variation in these mountains is more abrupt change. There have had 35 abrupt changes since 904 A.D., about 30 years on the average. There were 16 shifts from drought to wet, and 19 shifts from wet to drought. There were 9 abrupt changes in the 11th Century, 2 abrupt changes in the 15th and 16th Centuries. In the 20th Century there were 3 abrupt changes. Precipitation in these mountains frequently changed in the 11th Century, and less changed in the 15th and 16th Centuries. In the 20th Century precipitation changed frequently.