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祁连山位于我国西北部,气候较为干旱,海拔3200m以上出现林带,海拔4000m以上存在有永久性冰雪覆盖.自70年代起,在祁连山发现有树龄较长的老树,有的近千年,且与气候要素有较好关系,是我国利用树木年轮研究气候变化规律极有潜力的地区之一.同时,应该指出的是,早期在祁连山的树木年轮工作,由于样本量不足,达不到“复本”的基本要求,也因为量测与定年的误差,所建成的年表远不符国际树木年轮数据库(ITRDB)的规定.本文则按照树木年轮气候学的基本原理与概念,采用最新的分析程序,在该地区进行取样、建立年表,并通过研究年轮指数和温度降水的关系,重建了一条祁连山地区过去湿润指数变化序列,进而探讨该地区过去气候变化特征.
The Qilian Mountains are located in the northwestern part of China with relatively dry climate and forest belts above 3200m above sea level with permanent ice and snow cover above 4000m above sea level. Since the 1970s, older trees have been found in the Qilian Mountains, some nearly 1,000 years ago, Elements have a good relationship, is China’s use of tree rings to study the law of climate change has one of the most potential areas.At the same time, it should be pointed out that the early Qilian Mountains tree ring work, due to insufficient sample size, The basic requirements of this book, but also because of the error between measurement and dating, the built chronology far out of line with the provisions of the International Tree Ring Database (ITRDB) .This paper is based on the basic principles and concepts of tree ring climatology, using the latest Analysis program, sampling in this area, establishing chronology, and reconstructing a series of past wetness index changes in Qilian Mountains by researching the relationship between annual ring index and temperature precipitation, then discussing past climate change characteristics in this area.