萜类化合物 z-bo 2020-11-04 361

　　The characteristic biomarkers terpenoids have the potential to indicate the diversity of ecosystems and vegetation. In order to understand and apply terpenoid biomarkers, it is necessary to clarify the distribution characteristics and corresponding relationships of terpenoids in modern plants and topsoil in different ecosystems through census, identification and analysis.

　　The Cenozoic Environmental Team of the Institute of Qinghai-Tibet Plateau Research, Chinese Academy of Sciences, and Bai Yan, associate researcher of the Center for Excellence in Earth Sciences of the Chinese Academy of Sciences, collaborated with Dr. Zhou Youping from the Natural Product Stable Isotope Group of the School of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology. The vertical zonal height section analyzes the terpenoids in the soil and vegetation. The study area includes a section on the eastern slope of the Gongga east slope of the eastern Qinghai-Tibet Plateau with a temperate monsoon climate and rich ecological diversity (at an altitude of 1230 m to 4500 m), and a section on the northern slope of the West Kunlun Mountain in the mountainous desert area of the northern Qinghai-Tibet Plateau (at an altitude of 1300 m to 5050 m) . The main vegetation in this area is composed of meadows and alpine grasslands (Figure 2).

　　The research team detected 46 types of terpenoids in the topsoil of Mt. Gongga, mainly dandelane, oleanane, xylane, ursanane, lupin, glutamic acid and lanostane series, etc. (Figure 3- 4) It contains almost all terpenoids, consistent with the overlying vegetation with rich ecological diversity. However, in the arid West Kunlun Mountains, only seven polycyclic triterpenoids, mainly dandelane series, were found, indicating that the diversity of terpenoids reflects the ecological diversity of the overlying vegetation to a certain extent. In the topsoil of Gongga Mountain, less common triterpenoids were also found, and the mass spectra of the triterpenoids involved were sorted out. Corresponding to the vertical zone difference within the section, the topsoil at different altitudes has different terpenoid combination characteristics, which may reflect the vegetation distribution pattern determined by the vertical altitude climatic gradient of the study transect, and it is expected to become a paleovegetation and paleoclimate study on the Qinghai-Tibet Plateau The new characteristic indicators of sulphate also provide references for the reconstruction of ancient vegetation on the Qinghai-Tibet Plateau and the application of degradation products of terpenoids in sediments.