山东塔山黑松树轮稳定碳同位素与气候要素的响应

The Relationship between Pinus Thunbergii Parl Tree-ring Stable Carbon Isotope from Tashan in Shandong and Partial Climatic Factors

在山东塔山东坡采集黑松(Pinus thunbergii Parl)树芯样本,建立树轮稳定碳同位素年表,发现在数十年尺度上与工业革命以来大气稳定碳同位素比率降低的事实相吻合,但1976年之后树轮稳定碳同位素比率(δ13C)有逐渐上升的趋势,其原因可能是大气中CO2的积累效应导致了大气与海洋之间CO2交换的不稳定性.通过对样本δ13C序列校正提取高频序列后与气象站气象资料进行相关分析,发现树轮δ13C序列与温度呈正相关,与降水量和日照时数呈负相关,温度和降水以及日照时数对树轮δ13C的影响均存在一定的滞后效应,该地区树木生长的限制性气候因子比较复杂,可能受到多种气候因子的共同影响,在气候重建研究中应当慎重选择.

Tree - ring samples of Pinus thunbergii Parl at eastern Tashan in Shandong province were colleeted to integrate the tree -ring stable carbon isotope series. We found that tree -ring stable carbon isotope ratio （δ^13C） reflected the facts that the atmospheric δ^13C value decreased since the industrial revolution on decadal scale. However, it has a rising tendency since 1976, the reason may be the instability led by the exchange of CO2 between the atmosphere and ocean due to the accumulative effect of atmospheric CO2. The correlation analysis between the sample δ^13C series and meteorological indices were performed. The positive correlation was shown between tree -ring δ^13C series and temperature, and a negative correlation between tree - ring δ^13C series and precipitation and sunshine duration. There exists a lag effect of the influence of temperature, precipitation and sunshine duration on tree -ring δ^13C to some extent. The results indicated that the relationship between tree -ring stable carbon isotope series and meteorological indices are complicated, or may be subjected to the combined effect of many climate factors, so it should be deliberately selected during cli- mate reconstruction.