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Terpenoids in surface soils from different ecosystems on the Tibetan Plateau
Organic Geochemistry ( IF 2.6 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.orggeochem.2020.104125
Yan Bai , Qinghu Chen , Youping Zhou , Xiaomin Fang , Xiaoming Liu

Abstract Realizing the potential of terpenoid biomarkers as an unequivocal land ecosystem and floral diversity indicator calls for work to establish a direct link between the terpenoids extracted from the plants and those found in the underlying soils. To this end, we have characterized the triterpenoid profile of soils and vegetation along two altitudinal transects representing very different ecosystems. The first transect, comprising 31 sample sites, was on the eastern slopes of Mt Gongga (eastern Tibetan Plateau) rising from 1230 m to 4500 m above sea level, an area with a temperate monsoonal climate. The second transect, sampling 29 sites, was on the northern slopes of Mt West Kunlun, a region characterized by montane desert, meadow and alpine steppe (located between 1300 m and 5050 m above sea level). The dominant terpenoid biomarkers (polycyclic triterpenoids of the taraxerane, oleanane, friedelane, ursane, lupane, glutinane and lanostane series) identified in the soils were found to be consistent with the overlying vegetation. However, the discovery of some unusual triterpenoids, including the pentacyclic triterpene 3-methyl ethers (PTMEs), D:A-friedo-2,3-secoolean-2,3-dioic acid, methyl 3β-acetoxylup-20(29)-en-28-oate, 24-methylenecycloartan-3-one, 9,19-cyclolanostan-3-yl 24-methylene acetate, 3α-methoxy-9β-lanosta-7,24-dien-26,23-olide and 3α-methoxy-9β-lanost-7-en-26,23-olide in the Gongga soils, does not match the current vegetation and may be indicative of a long vanished forest-type vegetation. Thus, soil biomarkers may be a useful tool in the reconstruction of palaeo-vegetation.

中文翻译:

青藏高原不同生态系统表层土壤萜类化合物

摘要 意识到萜类生物标志物作为明确的土地生态系统和花卉多样性指标的潜力,需要努力在从植物中提取的萜类化合物与在下层土壤中发现的萜类化合物之间建立直接联系。为此,我们沿着代表非常不同的生态系统的两个海拔断面对土壤和植被的三萜剖面进行了表征。第一条样带包括 31 个样点,位于海拔 1230 m 至 4500 m 的贡嘎山(青藏高原东部)东坡,该地区属于温带季风气候。第二条样带,采样 29 个地点,位于西昆仑山北坡,该地区以山地沙漠、草甸和高山草原为特征(位于海拔 1300 m 至 5050 m 之间)。发现在土壤中鉴定的主要萜类生物标志物(蒲公英、齐墩果烷、弗里德兰、乌萨烷、羽扇豆烷、谷氨酰胺和羊毛脂烷系列的多环三萜)与上覆植被一致。然而,发现了一些不寻常的三萜,包括五环三萜 3-甲基醚 (PTME)、D:A-friedo-2,3-secoolean-2,3-dioic acid、甲基 3β-acetoxylup-20(29)- en-28-oate, 24-methylenecycloartan-3-one, 9,19-cyclolanostan-3-yl 24-methylene acetate, 3α-methoxy-9β-lanosta-7,24-dien-26,23-olide 和 3α-贡嘎土壤中的 methoxy-9β-lanost-7-en-26,23-olide 与目前的植被不匹配,可能表明长期消失的森林型植被。因此,土壤生物标志物可能是重建古植被的有用工具。发现土壤中鉴定出的乌萨烷、羽扇豆烷、谷氨酰胺和羊毛脂烷系列)与上覆植被一致。然而,一些不寻常的三萜类化合物的发现,包括五环三萜 3-甲基醚 (PTMEs)、D:A-friedo-2,3-secoolean-2,3-dioic acid、甲基 3β-acetoxylup-20(29)- en-28-oate, 24-methylenecycloartan-3-one, 9,19-cyclolanostan-3-yl 24-methylene acetate, 3α-methoxy-9β-lanosta-7,24-dien-26,23-olide 和 3α-贡嘎土壤中的 methoxy-9β-lanost-7-en-26,23-olide 与目前的植被不匹配,可能表明长期消失的森林型植被。因此,土壤生物标志物可能是重建古植被的有用工具。发现土壤中鉴定出的乌萨烷、羽扇豆烷、谷氨酰胺和羊毛脂烷系列)与上覆植被一致。然而,发现了一些不寻常的三萜,包括五环三萜 3-甲基醚 (PTME)、D:A-friedo-2,3-secoolean-2,3-dioic acid、甲基 3β-acetoxylup-20(29)- en-28-oate, 24-methylenecycloartan-3-one, 9,19-cyclolanostan-3-yl 24-methylene acetate, 3α-methoxy-9β-lanosta-7,24-dien-26,23-olide 和 3α-贡嘎土壤中的甲氧基-9β-lanost-7-en-26,23-olide 与目前的植被不匹配,可能表明长期消失的森林型植被。因此,土壤生物标志物可能是重建古植被的有用工具。发现了一些不寻常的三萜,包括五环三萜 3-甲基醚 (PTME)、D:A-friedo-2,3-secoolean-2,3-dioic acid、甲基 3β-acetoxylup-20(29)-en- 28-oate, 24-methylenecycloartan-3-one, 9,19-cyclolanostan-3-yl 24-methylene acetate, 3α-methoxy-9β-lanosta-7,24-dien-26,23-olide 和 3α-methoxy-贡嘎土壤中的 9β-lanost-7-en-26,23-olide 与目前的植被不匹配,可能表明长期消失的森林型植被。因此,土壤生物标志物可能是重建古植被的有用工具。发现了一些不寻常的三萜,包括五环三萜 3-甲基醚 (PTME)、D:A-friedo-2,3-secoolean-2,3-dioic acid、甲基 3β-acetoxylup-20(29)-en- 28-oate, 24-methylenecycloartan-3-one, 9,19-cyclolanostan-3-yl 24-methylene acetate, 3α-methoxy-9β-lanosta-7,24-dien-26,23-olide 和 3α-methoxy-贡嘎土壤中的 9β-lanost-7-en-26,23-olide 与目前的植被不匹配,可能表明长期消失的森林型植被。因此,土壤生物标志物可能是重建古植被的有用工具。贡嘎土壤中的 23-olide 和 3α-methoxy-9β-lanost-7-en-26,23-olide 与目前的植被不匹配,可能表明长期消失的森林型植被。因此,土壤生物标志物可能是重建古植被的有用工具。贡嘎土壤中的 23-olide 和 3α-methoxy-9β-lanost-7-en-26,23-olide 与目前的植被不匹配,可能表明长期消失的森林型植被。因此,土壤生物标志物可能是重建古植被的有用工具。
更新日期:2020-12-01
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