本文選題：樹(shù)輪年表　切入點(diǎn)：PDSI　出處：《冰川凍土》2017年02期 　論文類(lèi)型：期刊論文

【摘要】：祁連山東部位于亞洲季風(fēng)西北邊緣區(qū),對(duì)氣候變化十分敏感。由于該區(qū)位于半干旱區(qū),降水的變化直接影響人類(lèi)社會(huì)經(jīng)濟(jì)的發(fā)展,所以研究該區(qū)干旱變化情況及其機(jī)制非常重要。利用采自祁連山東部西北季風(fēng)邊緣、地處半干旱區(qū)的吐魯溝地區(qū)的油松樹(shù)輪樣芯,建立了樹(shù)輪寬度年表,時(shí)間跨度為1866-2003AD。樹(shù)輪寬度年表與氣象因子相關(guān)分析結(jié)果顯示樹(shù)木生長(zhǎng)主要響應(yīng)生長(zhǎng)季內(nèi)的降水和干旱變化。該年表與附近區(qū)域利用樹(shù)輪寬度重建的帕爾默干旱指數(shù)(PDSI)進(jìn)行對(duì)比,結(jié)果顯示嚴(yán)重的干旱時(shí)間發(fā)生在1920s-1930s、1966年、1974年、1982年和1990s和21世紀(jì)初。多窗譜分析研究表明,該區(qū)年表序列存在顯著的2~4 a周期(P0.05),該周期與ENSO變率吻合,與在賀蘭山、祁連山其他地區(qū)、興隆山及貴清山研究結(jié)果一致,表明這些區(qū)域可能受共同氣候因子的影響。
[Abstract]:The eastern Qilian Mountains is located in the northwestern margin of the Asian monsoon and is very sensitive to climate change. As the region is located in the semi-arid region, the change of precipitation directly affects the development of human society and economy. Therefore, it is very important to study the drought variation and its mechanism in this area. Using the sample cores of Pinus tabulaeformis collected from the northwest monsoon edge of the eastern Qilian Mountains and located in the Turugou region in the semi-arid region, a tree ring width chronology has been established. The time span is 1866-2003.The results of correlation analysis between tree ring width and meteorological factors show that tree growth mainly responds to precipitation and drought changes in growing season. This chronology is compared with the Palmer drought index (PDSI), which is reconstructed by tree ring width in nearby area. The results show that the severe drought time occurred in 1920s-1930s, 1966, 1974, 1982, 1990s and 1982. The results of multi-window spectral analysis show that there is a significant 2-year period of P0.05A in the chronological table sequence in this area, which coincides with the rate of ENSO variability and is similar to that in Helan Mountain. The results of the studies in other areas of Qilian Mountains, Xinglong Mountain and Guiqing Mountains are consistent, indicating that these regions may be affected by common climatic factors.
【作者單位】： 蘭州大學(xué)資源環(huán)境學(xué)院西部環(huán)境教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41401047) 蘭州大學(xué)中央高�；究蒲袠I(yè)務(wù)費(fèi)專(zhuān)項(xiàng)項(xiàng)目(lzujbky-2016-163)資助
【分類(lèi)號(hào)】：P532

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