基于土壤及植物稳定碳氮同位素和生物标记物的高寒草甸退化研究

项目名称： 基于土壤及植物稳定碳氮同位素和生物标记物的高寒草甸退化研究

项目编号： No.31260573

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 农业科学

项目作者： 乔有明

作者单位： 青海大学

项目金额： 46万元

中文摘要： 对青藏高原高寒草甸地区植物及土壤稳定碳、氮同位素组成进行研究是深刻理解该地区生物地球化学循环的基础课题。选取位于黄河源区的高寒草甸，以土壤和植物作为研究对象，通过分析土壤和植物中稳定碳、氮同位素组成和分布特征、生物标记物的浓度、碳原子数等，明确草甸土壤和植物叶片的稳定碳、氮同位素组成及生物标记物的差异，追溯有机物质输入来源，增进对高寒草甸土壤有机质的来源、分解和转化过程及区域碳库特征的认识，获得高寒草甸发生的生物地球化学过程信息，揭示高寒草甸在自然演替和人为干扰演替下生态过程与机制，为高寒草甸生态系统生物地球化学循环研究提供基础资料，为江河源区退化草地的生态恢复及治理以及草地固碳和技术选择提供指导。

中文关键词： 高寒草甸；稳定同位素；生物标记物；逆行演替；

英文摘要： Studying the plants and soil stable carbon and nitrogen isotopic composition of alpine meadow areas in Tibetan Plateau is a fundamental subject for understanding the biogeochemical cycles in the region. The alpine meadow in the Yellow River source region will be chosen as study area and soil and plants as the objects of study. By analyzing soil and plant stable carbon and nitrogen isotope composition and distribution feature, the concentration of the biomarkers, the number of carbon atoms, and comparing the differences of leaf stable carbon and nitrogen isotope composition and the biomarkers between soil and plant to trace the source of organic matter input. The study will enrich our knowledge of the source, decomposition, conversion process and regional carbon pools of soil organic matter in the alpine meadow area. More information on the alpine meadow biogeochemical processes can be provided, and the ecological processes and mechanisms of the alpine meadow under natural succession and human disturbance can be revealed. The objectives of the research are to reveal biogeochemical cycling of alpine meadow ecosystem, to provide basic information, guidance for managemant grassland carbon sequestration and technology options for degraded grassland ecological recovery of the Yangtze and Yellow Rivers headwater area.

英文关键词： Alpine meadow；stable isotope；biomarker；retrogressive succession；