摘要
草本植物烃类化合物对评估高海拔寒冷干旱地区生态及环境变化具有重要意义。通过有机地球化学方法,对天山高寒旱地区草本植物短叶羊茅(Festuca brachyphylla Schult.&Schult.f.)中烷烃和烯烃进行了分析。结果表明,高寒旱区短叶羊茅中烷烃分布范围为C_(16)~C_(29),平均碳链长度为17.91~24.49,主峰碳主要为C_(16)、C_(18)和C_(29)。烯烃分布范围为C_(16)~C_(31),多数以C_(18)或C_(20)为主峰碳,平均碳链长度为22.19~26.23,呈双峰型分布。烷烃和烯烃同时展现出整体低碳数组分(烷烃碳数≤23;烯烃碳数<27)相对含量高,在低碳数组分中偶碳优势和在高碳数组分中奇碳优势明显的特征。通过对比湿热和干旱等环境发现,天山高寒旱区短叶羊茅具有低碳数烷烃和烯烃组分含量高、平均碳链长度值小、奇偶优势在高低碳数烷烃和烯烃组分中分化的独特地球化学特征。同时,烯烃的平均碳链长度受到水源补给条件影响,水源条件好的短叶羊茅中烯烃值较大;短叶羊茅中烷烃与烯烃的平均碳链长度具有较为密切的正相关性。研究结果可为理解高寒旱区草本植物的生态适应机制,以及评估环境变化对生态系统影响提供重要参考。
Hydrocarbon compounds in herbaceous plants play an important role in assessing ecological and environmental changes in cold,arid,high altitude regions.The alkanes and olefins in Festuca brachyphylla Schult.&Schult.f.From high-altitude,cold and arid region of the Tianshan Mountain was analyzed using organic geochemical methods to determine their geochemical characteristics and environmental responses.The results showed that,for alkanes,the carbon numbers ranged from C_(16) to C_(29).The Average carbon Chain Length(ACLAlk)ranged from 17.91 to 24.49,with C_(16),C_(18) and C_(29) as the main peak carbon numbers.For olefins,the carbon number ranged from C_(16) to C_(31),the Average carbon Chain Length(ACLOle)ranged from 22.19 to 26.23 and the main peak carbon numbers were C_(16) and C_(20).Overall,alkanes and olefins in the herbaceous plants showed relatively higher contents of low carbon number components(≤23 for alkanes and<27 for olefins),with an even-to-odd predominance among lower carbon numbers and a significant odd-to-even predominance at higher carbon numbers.Comparative analysis with hot,humid,and drought-prone environments revealed that Festuca brachyphylla Schult.&Schult.f.from the high-altitude,cold,and arid Tianshan Mountains exhibits unique geochemical characteristics,including higher contents of low-carbon alkanes and olefins,lower Average carbon Chain Length(ACL)values,and notable differences in the Odd-Even Predominance(OEP)index between lower-and higher-carbon hydrocarbons.The Average carbon Chain Length of the Olefin(ACLOle)in herbaceous plants with sufficient water supply was relatively long.A strong positive correlation was observed between the Average carbon Chain Lengths of alkanes(ACLAlk)and Olefins(ACLOle)in Festuca brachyphylla Schult.&Schult.f.These results provide insights into the ecological adaptation mechanisms of herbaceous plants in high-altitude,cold,and arid environments and help evaluate the ecological impacts of environmental changes.
作者
韦枫
吴保祥
谢文欣
WEI Feng;WU Baoxiang;XIE Wenxin(Key Laboratory of Ecological Security and Sustainable Development in Arid Areas,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;The Second Geological and Mineral Exploration Institute of Gansu Provincial Bureau of Geology and Mineral Exploration and Development,Lanzhou 730020,China;Key Laboratory of Strategic Mineral Resources in the Upper Yellow River,Ministry of Natural Resources,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《地球科学进展》
北大核心
2025年第4期413-423,共11页
Advances in Earth Science
基金
第三次新疆综合科学考察项目(编号:2021xjkk1104)资助。
关键词
天山
高寒旱区
短叶羊茅
烷烃和烯烃
环境响应
Tianshan Mountain
High altitude cold and arid area
Festuca brachyphylla Schult.&Schult.f.
Alkanes and olefins
Environment response
