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稳定碳同位素在滨海湿地碳生物地球化学循环中的应用

陈菀,郗敏,李悦**,孔范龙,孔凡亭   

  1. (青岛大学化学化工与环境学院, 山东青岛 266071)
  • 出版日期:2013-06-10 发布日期:2013-06-10

Applications of stable carbon isotope to the studies of carbon biogeochemical cycle in coastal wetland: A review.

CHEN Wan, XI Min, LI Yue**, KONG Fan-long, KONG Fan-ting   

  1. (College of Chemical and Environmental Engineering, Qingdao University, Qingdao 266071, Shandong, China)
  • Online:2013-06-10 Published:2013-06-10

摘要: 碳作为滨海湿地中重要的生命元素,其生物地球化学循环过程是滨海湿地研究的核心内容之一。稳定同位素技术越来越多地被应用到滨海湿地碳生物地球化学循环过程的研究中,提高了其研究水平,并推动了其研究的进程。本文从有机物质生产、土壤有机质来源、食物链传递、温室气体排放以及可溶性有机碳输出5个方面,综述了滨海湿地碳生物地球化学循环过程的稳定同位素研究进展。通过植物及土壤δ13C值的测定进行有机质的生产机理研究及外源追溯,通过对比各生物种群的δ13C值分析碳在生态系统中的流动过程,通过湿地排放温室气体及可溶性有机碳δ13C值的测定揭示影响碳输出的环境因子。最后,文章总结了当前研究中存在的问题,并对其研究前景进行了展望。

关键词: 高光谱影像, 土壤重金属含量, 偏最小二乘回归, 玉树县, 植被光谱反射率

Abstract: Carbon is an important element of life, and its biogeochemical cycle is one of the core contents in the study of coastal wetland. Stable isotope technique is more and more applied in this domain, having improved the research level and promoted the research progress. This paper summarized the advances in the stable isotope research on the carbon biogeochemical cycle in coastal wetland from the aspects of organic matter production, soil organic matter traceability, transferring process of food chain, greenhouse gases emission, and dissolved organic carbon output. The mechanisms and extraneous sources of organic matter production are investigated by the measurement of plant and soil δ13C values, the carbon flow in the wetland ecosystem is analyzed through the comparison of the δ13C values of various species, and the environmental factors affecting the carbon output of wetland ecosystem are revealed via the measurement of the δ13C values of emitted greenhouse gases and dissolved organic carbon. By the end of this paper, the existing problems and the future directions of related studies were discussed and prospected.

Key words: hyperspectral images, partial least squares regression (PLSR), vegetation spectral reflectance, soil heavy metal concentrations, Yushu County.