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森林生态系统植硅体及其封存有机碳研究进展

李双1,2,盛茂银1,2*   

  1. (1贵州师范大学喀斯特研究院, 贵阳 550001;2国家喀斯特石漠化治理工程技术研究中心, 贵阳 550001)
  • 出版日期:2019-12-10 发布日期:2019-12-10

Research progress of phytolith and phytolith-occluded organic carbon in forest ecosystems.

LI Shuang1,2, SHENG Mao-yin1,2*   

  1. (1Institute of Karst Research, Guizhou Normal University, Guiyang 550001, China; 2National Engineering Research Center for Karst Rocky Desertification Control, Guiyang 550001, China).
  • Online:2019-12-10 Published:2019-12-10

摘要: 森林生态系统作为陆地生态系统主体,是一个可再生循环系统,其在演变发育过程中,存储了大量环境变化的信息,在全球生态系统碳汇中占据重要地位。植硅体碳封存被认为是一种森林生态系统长期碳封存的途径,开展对森林生态系统植硅体及其封存有机碳的研究将对估算森林生态系统长期碳封存潜力,应对全球气候变暖有重要意义。本文综述了植硅体及其封存有机碳在植物凋落物土壤各个环节含量及存在形式的差异,探讨了其迁移变化规律。植硅体及其封存有机碳在不同环节之间的周转和含量受内、外部因素综合影响,具有不稳定性。由于对植硅体及其封存有机碳的量化研究较为缺乏,尤其是针对生态脆弱区,今后应加强植硅体及植硅体碳形成机理研究,估测植物不同器官碳封存量,增加研究的时空尺度,加强在生态脆弱区开展植硅体碳汇研究,为准确估算森林生态系统植硅体碳汇提供依据。

关键词: 长白落叶松, 暗呼吸速率, 光合-光响应曲线, 最优模型, 光补偿点, 光饱和点, 净光合速率

Abstract: As the main part of terrestrial ecosystems, forest ecosystem is a renewable circulation system. In its evolution course, forest ecosystem stored a large number of the information of environmental changes, and plays an important role in the global carbon sink. Phytolith-occluded carbon (PhytOC) is considered as a pathway of longterm carbon sequestration in forest ecosystem. Research of phytolith and PhytOC in forest ecosystems is of great significance to estimate the long-term carbon sequestration potential of forest ecosystems and to address global warming. Here, we reviewed the differences in the content and existing forms of phytolith and PhytOC in plant, litter and soil, and their migration dynamics. The turnover and content of phytolith and PhytOC among different channels are stable as they are affected by both internal and external factors. Quantitative information on phytolith and PhytOC is lacking, especially for ecologically fragile areas. In the future, it is necessary to strengthen the study on the formation mechanism of phytolith and PhytOC, estimate carbon sequestration of different organs of plants, enlarge spatial and temporal scales, and intensify the study of PhytOC in ecologically fragile areas, so as to provide reference for accurate estimation of carbon sequestration in phytoliths in forest ecosystems.

Key words: optimal model, net photosynthetic rate, dark respiration rate., photosynthesis-light response curve, light saturation point, Larix olgensis, light compensation point