本文選題：阿勒泰 + 碳同位素��； 參考：《蘭州大學(xué)》2015年碩士論文

【摘要】：我們在阿爾泰山哈拉沙子濕地利用泥炭手鉆采集到長度為742cm的泥炭巖芯,參考國內(nèi)外樹輪、湖泊和泥炭α-纖維素的提取流程,進(jìn)行了大量的條件實驗,最終建立起一套有效的適合泥炭巖芯樣品的α-纖維素提取流程。利用建立起來的纖維素提取流程對從北疆阿爾泰山哈拉沙子濕地獲取的泥炭巖芯樣品進(jìn)行了纖維素的提取和穩(wěn)定碳同位素的分析測試,從而建立其在過去11.5ka以來的演化序列。為了明確阿勒泰泥炭纖維素碳同位素的氣候環(huán)境指示意義,我們于2014年4-9月在該泥炭地開展了現(xiàn)代過程研究,包括：每個月在泥炭地收集當(dāng)月的降水、泥炭地水、溪水樣品和采集莎草樣品,并在2000-2450m海拔梯度上采集莎草樣品；7月在泥炭地采集了其他23種現(xiàn)代植物樣品；8月在海拔2000m左右處采集4棵西伯利亞落葉松的12根樹輪樣芯。對采集的莎草、現(xiàn)代植物樣品以及樹輪樣品進(jìn)行了纖維素的提取和穩(wěn)定碳同位素的分析測試工作。在阿勒泰泥炭地開展的現(xiàn)代過程研究結(jié)果表明,該泥炭地優(yōu)勢植物莎草(sedge),其纖維素碳同位素?zé)o論是在時間序列上還是在海拔梯度的空間序列上都與溫度變化存在較好的相關(guān)關(guān)系；泥炭地附近獲得的樹輪樣芯,其α-纖維素碳同位素與6-8月的平均溫度存在顯著的正相關(guān)關(guān)系。結(jié)合對全球其它研究地點相關(guān)現(xiàn)代過程研究結(jié)果的分析、與國內(nèi)其它典型泥炭纖維素碳同位素記錄、中亞干旱區(qū)典型濕度記錄以及可靠的溫度記錄的對比分析,我們認(rèn)為阿勒泰泥炭纖維素碳同位素應(yīng)該是一個溫度變化的指示器。因此,阿勒泰泥炭纖維素碳同位素主要記錄了該區(qū)域過去11.5 ka以來溫度的演化歷史,其溫度變化表現(xiàn)出早、晚全新世溫度相對較高而中全新世相對較低的“V”型特征,且溫度變化整體上可以分為4個階段：約11.4～9.9 ka BP為低溫期；約9.9～6.2 ka BP為高溫期,但也存在一些明顯的冷事件的波動：約6.2～3.9 ka BP為相對低溫期；約3.9-0 ka BP為相對高溫期。進(jìn)一步的驅(qū)動機(jī)制分析結(jié)果表明：在軌道尺度上,該泥炭纖維素碳同位素記錄的溫度變化主要受控于太陽輻射和溫室氣體含量變化。具體表現(xiàn)在,早全新世的高溫期主要受太陽輻射的驅(qū)動,而晚全新世的升溫趨勢可能與大氣溫室氣體含量增加有關(guān)；在千年尺度上,阿勒泰泥炭纖維素碳同位素清晰的記錄了數(shù)次明顯的氣候突變事件,與北大西洋浮冰碎屑事件有較好的對應(yīng)關(guān)系,說明北大西洋的溫度變化通過西風(fēng)環(huán)流對中亞干旱區(qū)的溫度具有一定影響；功率譜分析和突變事件的對比分析表明,研究地點11.5 kaBP以來的溫度長期變化趨勢上還疊加了百年尺度上的太陽活動的影響。泥炭纖維素穩(wěn)定同位素的氣候環(huán)境指示意義復(fù)雜,相關(guān)的現(xiàn)代過程研究對于明確某一具體研究點泥炭纖維素穩(wěn)定同位素的氣候環(huán)境意義具有重要的參照意義。我們的初步結(jié)果表明,阿勒泰泥炭纖維素碳同位素具有高分辨率重建全新世溫度變化的潛力,這對于深入理解該區(qū)域全新世以來氣候演化和可能的氣候驅(qū)動機(jī)制都具有重要的科學(xué)意義。
[Abstract]:In the ARL Taishan Hara sand wetland, a peat core with a length of 742cm was collected by peat hand drill. A large amount of conditional experiments were carried out with reference to the extraction process of the domestic and foreign trees, lakes and peat - alpha cellulose. Finally, a set of effective process for the extraction of alpha cellulose suitable for peat core samples was established. The cellulose extraction and stable carbon isotope analysis of the peat core samples obtained from the Taishan Hara sand wetland, Northern Xinjiang, were tested by the vitamin extraction process to establish its evolution sequence since the past 11.5ka. In order to clarify the climatic and environmental significance of the carbon isotopes of Aletai peat cellulose, we were 4-9 in 2014. Modern process studies were carried out in the peat area, including monthly precipitation, peat soil water, stream samples and collection of sedge samples each month in peat, and sample of sedge at 2000-2450m elevation; 23 other modern plant samples were collected in peat land in July, and 4 sib at about 2000m altitude in August. 12 tree core of Leah larch. Cellulose extraction and stable carbon isotope analysis of collected SHAKESPEA, modern plant samples and tree wheel samples. Modern process research in peat land in Aletai showed that the dominant plant of the peat was sedge, and its cellulose carbon isotopes were in time. There is a good correlation between the spatial sequence and the spatial sequence on the elevation gradient. The tree core in the vicinity of the peat land has a significant positive correlation with the average temperature of 6-8 months. Other typical peat cellulose carbon isotopes, typical humidity records in the arid region of Central Asia and a reliable temperature record comparison, we believe that the carbon isotopes of Aletai's Peat cellulose should be an indicator of temperature changes. Therefore, the carbon isotopes of Aletai peat cellulose mainly recorded the past 11.5 Ka of the region. The temperature evolution history shows that the temperature changes show early, late Holocene and lower middle Holocene "V" type characteristics, and the temperature change can be divided into 4 stages on the whole: About 11.4 to 9.9 Ka BP as cryogenic period; about 9.9 to 6.2 Ka BP as high temperature period, but there are some obvious fluctuations of cold events: about 6.2 to 3. .9 Ka BP is relative low temperature period; about 3.9-0 Ka BP is a relatively high temperature period. Further driving mechanism analysis shows that the temperature change of the carbon isotope record of the peat cellulose is mainly controlled by the change of solar radiation and greenhouse gas content on the track scale. The warming trend of the late Holocene may be related to the increase of atmospheric greenhouse gas content. On the Millennium scale, the carbon isotopes of Aletai peat cellulose clearly record several obvious climatic catastrophes, which have a good correspondence with the North Atlantic ice debris events, indicating that the North Atlantic temperature changes through the westerly circulation. The temperature of the arid region of Central Asia has a certain influence. The analysis of power spectrum analysis and the comparison of the catastrophe events show that the long-term change trend of the temperature since the 11.5 kaBP is also superimposed on the influence of the solar activity on the Centennial scale. The climate ring indication of the stable isotopes of peat cellulose is complex, and the related modern process research Our preliminary results show that the carbon isotopes of Aletai peat cellulose have the potential to reconstruct the Holocene temperature with high resolution, which is useful for the understanding of the climate evolution since the Holocene in this region. The climate driving mechanism of energy has important scientific significance.

【學(xué)位授予單位】：蘭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P597;P532

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