本文選題：甘青藏地區(qū) + 地表土壤��； 參考：《地質(zhì)論評(píng)》2017年01期

【摘要】：本文通過對(duì)海拔高度在2500~4500 m的甘肅南部和祁連山、青海東部、西藏東部林中表土、林間表土、森林上限表土、森林下限表土、森林上限高山草甸土,以及青海玉樹冬給錯(cuò)納地區(qū)亞高山荒漠—草甸土中可溶有機(jī)質(zhì)正構(gòu)烷烴分析,利用檢測(cè)出的類異戊二烯烴的分布特征,對(duì)Pr(姥鮫烷)、Ph(植烷)的成因特征進(jìn)行研究。結(jié)果表明,在不同地理環(huán)境土壤中均有明顯的Pr、Ph存在,Pr/Ph(姥植比)主要為0.6~1.4,平均0.95;Pr/n-C17值主要為0.2-1.2,平均0.64;Ph/n-C18值主要為0.4~1.4,平均0.85。Pr和Ph不僅在水體中生成,在土壤環(huán)境中也可以形成。Pr/Ph值與不同生態(tài)環(huán)境土壤之間沒有明確的相關(guān)性,但與不同地理區(qū)域有一定的聯(lián)系。在較為溫濕的土壤中Pr優(yōu)勢(shì),可能與微生物活動(dòng)強(qiáng)烈,采用有氧呼吸方式降解有機(jī)質(zhì)有關(guān);干旱、寒冷土壤中Ph優(yōu)勢(shì),可能主要與厭氧發(fā)酵有關(guān)。由于生成Pr、Ph有機(jī)母質(zhì)及演化途徑的差異,以及熱演化、成巖過程中的轉(zhuǎn)變,其比值很大程度上影響對(duì)沉積盆地原始介質(zhì)環(huán)境信息的判斷。
[Abstract]:This paper deals with the forest topsoil, interstand topsoil, upper forest topsoil, forest lower limit topsoil, forest upper limit alpine meadow soil of southern Gansu and Qilian Mountains, eastern Qinghai and eastern Tibet, which have an altitude of 25000 ~ 4500 m above sea level, and the forest upper limit topsoil, the forest lower limit topsoil, the forest upper limit alpine meadow soil. Based on the analysis of normal alkanes of soluble organic matter in subalpine desert meadow soil of Yushu, Qinghai Province, the genetic characteristics of Pr-phane were studied by using the distribution characteristics of isoprene hydrocarbons detected. The results showed that there was a significant presence of Pr-Ph in the soils of different geographical environments. The Pr-pPhratio of Pr-Ph was 0.6 ~ 1.4, the average value of 0.95 Pr-n-C17 was 0.2-1.2, and the average value of 0.64 Ph-n-C18 was 0.40.4.The average 0.85.Pr and Ph were generated not only in the water, but also in the soil. In the soil environment, the value of. Pr- / Ph was not correlated with the soil of different ecological environment, but it was related to different geographical regions. The predominance of pr in warm and wet soils may be related to the strong microbial activity and aerobic respiration to degrade organic matter, while the predominance of Ph in arid and cold soils may be mainly related to anaerobic fermentation. Due to the difference of the organic parent material and the evolution path of Pr-Ph, as well as the thermal evolution and the transformation during diagenesis, the ratio of the organic parent material to Pr-Ph greatly influences the judgement of the environmental information of the original medium in the sedimentary basin.
【作者單位】： 蘭州大學(xué)地質(zhì)科學(xué)與礦產(chǎn)資源學(xué)院(西部礦產(chǎn)資源重點(diǎn)實(shí)驗(yàn)室);
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(編號(hào):NSFC 41571177,41601187,41501209) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金(編號(hào):lzujbky-2015-254)的成果~~
【分類號(hào)】：S153
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本文編號(hào)：1856411