基于稳定同位素的SPAC水碳拆分及耦合研究进展

发布时间：2018-07-28 15:53

【摘要】：土壤-植被-大气连续体(SPAC)是陆地水文学、生态学和全球变化领域的重要研究对象,其水碳循环过程及耦合机制是前沿性问题.稳定同位素技术示踪、整合和指示的特征有助于评估分析生态系统固碳和耗水情况.本文在简述稳定同位素应用原理和技术的基础上,重点阐释了基于稳定同位素光学技术的SPAC系统水碳交换研究进展,包括:在净碳通量中拆分光合与呼吸量,在蒸散通量中拆分蒸腾与蒸发量,以及在系统尺度上的水碳耦合研究.新兴的技术和方法实现了生态系统尺度上长期高频的同位素观测,但在测量精准度、生态系统呼吸拆分、非稳态模型适应性、尺度转换和水碳耦合机制等方面存在挑战.本文探讨了现有主要研究成果、局限性以及未来研究展望,以期对稳定同位素生态学领域的新研究和技术发展有所帮助.
[Abstract]:Soil-vegetation-atmosphere continuum (SPAC) is an important research object in the field of terrestrial hydrology ecology and global change. The tracer, integration and indicative characteristics of stable isotope techniques are useful for assessing carbon sequestration and water consumption in ecosystems. Based on a brief introduction of the application principle and technology of stable isotopes, the progress of water carbon exchange in SPAC system based on stable isotope optics is described in this paper, including the resolution of photosynthesis and respiration in net carbon flux. Separation of transpiration and transpiration in evapotranspiration fluxes, and water and carbon coupling at system scale. Emerging technologies and methods have achieved long-term high-frequency isotopic observations on ecosystem scale, but there are challenges in measurement accuracy, ecosystem respiration resolution, adaptability of unsteady model, scale transition and water-carbon coupling mechanism. In this paper, the main research achievements, limitations and future research prospects are discussed in order to be helpful to the new research and technical development in the field of stable isotope ecology.
【作者单位】：北京林业大学水土保持学院水土保持与荒漠化防治教育部重点实验室;
【基金】：国家自然科学基金项目(41430747,41401013) 北京市教委项目(PXM2017_014207_000043)资助~~
【分类号】：P597;Q948

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