利用树轮宽度重建近280a来祁连山东部地区的春季降水

Spring Precipitation Reconstructed in the East of the Qilian Mountain During the Last 280 a by Tree Ring Width

利用采自祁连山东部的祁连圆柏样芯样本 ,建立标准化年表 ,并将标准年表的树轮指数与附近的乌鞘岭气象站的温度和降水进行相关分析 .结果表明 ,年轮指数与 3～ 4月降水呈显著正相关 ,相关系数为 0 .5 2 5 .利用标准化年表与 3～ 4月降水的线性回归方程重建了研究区近 2 80a来的 3～ 4月降水 ,统计检验表明重建结果是可靠的 .

Dendrochronology is studying how to reconstruct the past global change. In virtue of the tree ring easy to be dated, the width of the tree ring able to be measured precisely and closely relating to climate change, the trees dispersing widely and easy to be sample, using tree ring data to reconstruct climate change is developing very quickly in the word. With the consummation of the dendrochronology theory and the development of the analysis method, there are thousands of tree ring chronologies were build in the world, many of which were used to reconstruct the past climate change. Until now the tree ring width and density data not only were used to reconstruct the long period but also the large space scale climate change. The tree ring width standard chronology for the Sabina przewalskii of the east of the Qilian Mountains was build. The relationship between the tree ring index of the standard chronology and the meteorology data of the nearest meteorology station was worked out. It is found that the tree ring index closely relates to the March-April precipitation, with a correlative coefficient of 0.525. The linear regression function was used to reconstruct the March-April precipitation of the researched area. Statistics indicates that the reconstruction is dependable. Although the close relationship between the March-April precipitation and the annual precipitation was not understand very well, it is believed that the March-April precipitation is able to represent annual humidity. Thus, the reconstruction is meaningful.