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利用在神农架地区采集的121个表土样品孢粉鉴定得出的结果,结合对应的采样区7个相关气象站30年来(1971年1月至2000年12月)连续观测的气象资料库,选取55种常见孢粉,采用空间拟合与逐步回归方法建立了神农架地区孢粉气候因子年平均温度的转换函数:T=7.649-2.33097X冷杉属-0.10873X桦属-0.17352X菊科-0.13176X十字花科+0.13356X大戟科-0.83069X桔梗科+1.96494X石韦属+0.38411X凤尾蕨+2.77741X卷柏属+0.04439X厚壁单缝孢属,并利用大九湖297cm厚的全新世泥炭剖面的孢粉百分比含量数据对上述函数做了检验,重建了大九湖15.753kaBP以来的年平均温度变化序列.该温度序列较好地反映了晚冰期以来的气候变化特征,对最老仙女木期、老仙女木、新仙女木、8.2kaBP等极端冷气候事件和博令阿勒罗德暖期及气候波动都有准确的指示,还揭示了全新世适宜期、晚全新世温干气候、及近1ka以来大九湖的气候变化特征.研究表明,神农架大九湖地表和地层剖面孢粉样本同样具有重要气候意义,其温度转换函数和重建的温度序列对研究末次冰期以来的气候变化有着重要参考价值.
Based on the results of the identification of 121 topsoil samples collected in Shennongjia area and the continuous observational meteorological database of seven related weather stations in the corresponding sampling area for 30 years (January 1971 to December 2000), 55 The common sporo-pollen, the spatial fitting and stepwise regression method was used to establish the transfer function of annual average temperature of sporopollen climatic factors in Shennongjia area: T = 7.649-2.33097X Abies-0.10873X Betula-0.17352X Compositae-0.13176X Cross Flowering + 0.13356X Euphorbiaceae -0.83069X Campanulaceae + 1.96494X Shi Wei is + 0.38411X Pteridium + 2.77741X Selaginella + 0.04439X thick-walled monosporidium, and the use of Grand Lake 297cm thick new The spatula percentage content data from the peat profile were used to test the above function and to reconstruct the annual average temperature change sequence since 15.753kaBP in Daxujiu Lake.This temperature sequence well reflects the climatic change characteristics since late glacial period, Fairy wood, the old fairy wood, the new fairy wood, 8.2kaBP and other extreme cold events and Bering Allerud warm period and climate fluctuations have accurate instructions, but also revealed the Holocene suitable period, the late Holocene warm dry climate , And the Great Lakes since the last 1ka Climate change characteristics. Studies have shown that DAJIUHU surface pollen samples and stratigraphic section also has important significance climate, temperature conversion function of temperature and reconstruction sequence has an important reference value to the study of climate changes since the last glacial period.