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利用采自山西五鹿山国家自然保护区内的两组油松样本共79根树芯,建立了研究区1893~2008年的树轮宽度年表。统计相关分析表明,油松树轮宽度生长主要受5~6月平均气温(r=-0.55,p<0.001)和同期降水总量(r=0.38,p<0.001)的共同影响,其中5~6月平均气温对树木径向生长的影响更为显著。因此,五鹿山树轮宽度年表可以用来指示5~6月平均气温的变化。在过去105年的有效年表时段(1904~2008年)里,研究区共出现3个高温时段(1924~1932年、1966~1978年和1999~2002年)和2个低温(1937~1951年和1986~1996年)时段,这些高、低温时段可以与周边其他地区树轮重建的气温序列中的高、低温时段相匹配。自1990年以来研究区气温呈逐步上升趋势,但是这一时段的气温仍在历史气温波动范围之内。空间相关分析表明该树轮宽度年表对研究区及周边较大范围的5~6月平均气温都有一定的指示意义。
A total of 79 tree cores were collected from two sets of Pinus tabulaeformis collected from the Wulu Mountain National Nature Reserve in Shanxi Province. The tree-ring width chronology of the study area from 1893 to 2008 was established. Statistical correlation analysis showed that the width growth of Pinus tabulaeformis was mainly affected by the mean air temperature from May to June (r = -0.55, p <0.001) and precipitation during the same period (r = 0.38, p <0.001) The effect of monthly mean temperature on the radial growth of trees is more significant. Therefore, Wulu Shan tree wheel width chronology can be used to indicate the average temperature from May to June changes. In the past 105 years of valid chronology (1904-2008), there were three high temperature periods (1924-1932, 1966-1978 and 1999-2002) and two low temperatures (1937-1951) And 1986-1996), these high and low temperature periods can be matched with the high and low temperature periods in the sequence of tree-ring rebuilds in other surrounding areas. The temperature in the study area has been gradually increasing since 1990, but the temperature in this period is still within the range of historical temperature fluctuations. Spatial correlation analysis shows that the tree-ring chronology has a certain indication to the large-scale 5-June average temperature in the study area and the surrounding area.