Spore-pollen-climate factor transfer function and paleoenvironment reconstruction in Dajiuhu,Shennon

来源 :Chinese Science Bulletin | 被引量 : 0次 | 上传用户:pz421769788
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The identified results of 121 surface sediment spore-pollen samples in Shennongjia and meteorological data base of 30 years(January,1971―December,2000)of 7 meteorological stations around Dajiuhu, Shennongjia are used in this study.Selecting 55 species of common spore-pollen with the method of space fitting and stepwise regression we construct the pollen climate factor transfer function of annual mean tem- perature:T=7.649-2.33097X Abies -0.10873X Betula -0.17352X Compositae -0.13176X Cruciferae +0.13356XEuphorbiaceae -0.83069X Campanulaceae +1.96494XPyrrosia+0.38411XPteris+2.77741XSelaginella+0.04439XMonolites.We had reconstructed annual mean temperature series by use of the sporo-pollen samples concentra-tion percentage in peat section with 297 cm thickness in Dajiuhu since 15.753 kaBP.The temperature series reflect well the character of climatic change since the late glacial,which indicates extreme cold climate event of the Oldest Dryas,the Older Dryas,the Younger Dryas and the 8.2 kaBP,the same to the climate fluctuations of Bolling Warm Period and Allerod Warm Period,and the character of temperature change fluctuating frequently at the transition age from the late glacial to the Holocene.The reconstructed temperature also indicate Holocene Optimum,late Holocene warm-dry climate,and the character of climatic change in Dajiuhu in the last 1 ka.The conclusion is that the sporo-pollen samples have important climatic significance to surface sediment and the section of Dajiuhu,Shennongjia and important reference value to studying climatic change during the last glaciation by the temperature transfer function and reconstructed temperature series. The identified results of 121 surface sediment spore-pollen samples in Shennongjia and meteorological data base of 30 years (January, 1971-December, 2000) of 7 meteorological stations around Dajihu, Shennongjia are used in this study. Select 55 species of common spore- pollen with the method of space fitting and stepwise regression we construct the pollen climate factor transfer function of annual mean temperture: T = 7.649-2.33097X Abies -0.10873X Betula -0.17352X Compositae -0.13176X Cruciferae + 0.13356XEuphorbiaceae -0.83069X Campanulaceae + 1.96494X Pyrrosia + 0.38411XPteris + 2.77741X Selaginella + 0.04439XMonolites.We had reconstructed annual mean temperature series by use of the sporo-pollen samples concentra- tion percentage in peat section with 297 cm thickness in Dajihuhu since 15.753 kaBP.The temperature series reflectances well the character of climatic change since the late glacial, which indicates extreme cold climate event of the Oldest Dryas, the Older Dryas, the Younger Dryas and the 8.2 kaBP, the same to the climate fluctuations of Bolling Warm Period and Allerod Warm Period, and the character of temperature change fluctuating frequently at the transition age from the late glacial to the Holocene. recon reconcted temperature also indicate Holocene Optimum, late Holocene warm-dry climate, and the character of climatic change in Dajihuhu in the last 1 ka. the conclusion is that the sporo-pollen samples have important climatic significance to surface sediment and the section of Dajihuhu, Shennongjia and important reference value to studying climatic change during the last glaciation by the temperature transfer function and reconstructed temperature series.
其他文献
09-Ⅱ浆状炸药是一种利用废火药作敏化剂和含能添加剂的浆状炸药,这类炸药爆轰感度较低。该文以实验为基础,研究了发泡条件与09-Ⅱ浆状炸药中敏化气泡数、爆轰感度之间的关系,这些条件
旋流式滚磨加工技术是适应于轴类、盘套类和齿轮等零件进行光整加工的新技术。本文在大量实验的基础上,分析研究了在滚磨加工中,影响金属去除量和零件表面粗糙度、表面硬度以
用单试样三曲线法测定了12CrlMoV、1.25Cr0.5MoSi、16MnR三种钢材和一种焊缝金属的J积分阻力曲线及其条件起裂值,与标准的多试样法测定结果基本吻合。实验表明,单试样三曲线的关联分析反映裂纹三点弯曲试样
在我国古代众多亲属称谓中,甥舅、姪姑两组称谓,颇能反映这些称谓所产生的社会形态及社会根源。
彭坤明教授是我国远程教育发展与开放大学建设研究的著名学者.彭坤明教授自2002年起担任江苏广播电视大学校长,现任江苏开放大学党委书记,在长期的管理工作实践中形成了对我
目的 :研究小鼠静脉给药和脑室给药后CPU 86 0 17通过血脑屏障的双向渗透性。方法 :小鼠给予 3 0mg/kgCPU 86 0 17(盐酸对氯苄四氢小檗碱 )后 ,在 5 ,10 ,2 0 ,30 ,6 0min时
中国古代的文明史上,传统礼仪文化是源远流长,礼仪文化的发展是一个国家文明进步的一种表现形式。随着国际经济、文化之间的交流日益频繁,对于整个国家的人民素质提出了更高
本实验观察了卵泡抑素(follistatin)对骨髓间充质干细胞(BMSCs)向神经细胞分化的影响。利用Percoll密度梯度离心法及贴壁筛选法分离培养和扩增成人的BMSCs,通过流式细胞术分
目的:通过对腹直肌形态学、神经入肌点和肌内神经分支分布的研究,为腹直肌的临床肌移植提供形态学资料。方法:大体解剖法和改良Sihler’s肌内神经染色法。结果:(1)腹直肌肌重
城市建设步入优化提升的转型发展阶段,慢行交通作为绿色可持续发展的交通方式受到越来越多的重视,建设慢行交通可以有力的促进城市公交优先、混合土地开发模式的发展,缓解小