本文選題：渭南 + 孢粉�。� 參考：《石家莊經(jīng)濟(jì)學(xué)院》2015年碩士論文

【摘要】：隨著對(duì)黃土-古土壤的認(rèn)識(shí)及其古氣候意義的確定,尤其是近幾十年以來國(guó)際上古氣候研究的發(fā)展,在很大程度上推動(dòng)了我國(guó)黃土-古土壤的古氣候研究,試圖將古氣候的定性描述發(fā)展成為定量的科學(xué)探索。此次一共采集黃土高原表土花粉樣品196個(gè),植被樣方調(diào)查196個(gè),首次在黃土高原地區(qū)進(jìn)行大區(qū)域高密度表土孢粉樣品采集并同步進(jìn)行現(xiàn)代植被調(diào)查,利用黃土高原地區(qū)表土孢粉資料并初步建立了表層黃土孢粉-植物生態(tài)-氣候關(guān)系。渭南是我國(guó)黃土高原地區(qū)古環(huán)境研究的熱點(diǎn)地區(qū)之一。結(jié)合渭南6米深的剖面,一共取樣并分析孢粉樣品150個(gè),定量重建了渭南地區(qū)全新世以來的古氣候演變過程。在14.64~8.49ka B.P階段,年平均溫度8.39℃,年平均降水量為178.8mm。在8.49~5.036ka B.P階段,年平均溫度為14.63℃,年平均降水量為245.51mm。在5.036~3.58ka B.P階段,年平均溫度12.56℃,平均降水量為年261.06mm。在3.58~3.29ka B.P階段,年平均溫度7.90℃,年平均降水量為205.87mm。在3..29~至今階段,年平均溫度8.91℃,年平均降水量為123.76mm。定量重建渭南地區(qū)全新世年來的氣候變化表明,渭南地區(qū)全新世變化與經(jīng)典的全新世變化大致相符,變化的規(guī)律是全新世早期總體表現(xiàn)為快速升溫降水明顯增多,而在全新世的中期,是氣溫最高降水量最多的最佳氣候時(shí)期。全新世晚期以來,該區(qū)氣候再次有溫度降低降水量減小的變化趨勢(shì)。重建黃土高原氣候變化歷史是了解世界全球氣候變化的橋梁,深入了解古氣候變化特征,不僅可以了解不同周期內(nèi)氣候變化特征和機(jī)制,還可以為預(yù)測(cè)未來氣候變化提供資料,定量探索恢復(fù)黃土高原渭南地區(qū)的氣候變化對(duì)探索該地區(qū)乃至全國(guó)的生態(tài)環(huán)境演化和發(fā)展均具有重要意義。
[Abstract]:With the understanding of loess and paleosol and the determination of paleoclimate significance, especially the development of international paleoclimate research in recent decades, the paleoclimate research of loess paleosol in China has been promoted to a great extent. This paper attempts to develop the qualitative description of paleoclimate into a quantitative scientific exploration. A total of 196 pollen samples and 196 vegetation samples were collected from the topsoil of the Loess Plateau. For the first time, the pollen samples of the high-density topsoil in the Loess Plateau were collected and the modern vegetation survey was carried out simultaneously. Based on the surface soil pollen data in the Loess Plateau, the relationship between surface loess sporopollen, plant ecology and climate was preliminarily established. Weinan is one of the hotspots in the study of paleoenvironment in the Loess Plateau of China. The paleoclimate evolution process since Holocene in Weinan area has been quantitatively reconstructed by taking and analyzing 150 sporopollen samples at a depth of 6 meters in Weinan area. In the 14.64~8.49ka B.P stage, the annual average temperature is 8.39 鈩，

本文編號(hào)：1914447