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Background and aims <p>Cropland ecosystem plays an important role in terrestrial carbon (C) sequestration through silicon (Si)-C coupled biogeochemical cycle. Herein, we want to investigate potential Si–C coupling processes and preliminarily assess the phytolith associated C sequestration potential of Job’s tears (<i>Coix lacryma-jobi</i> L.).</p> Methods <p>Plant samples of Job’s tears, including roots, stems, leaves, husks, and grains, were collected from Guizhou Province, China. A modified wet digestion method of H₂O₂-HNO₃ was employed to extract phytoliths from collected plant samples. Field emission scanning electron microscopy coupled with energy-dispersive spectroscopy (FESEM-EDS) was employed to observe the morphology of relevant samples and perform semi-quantitative analysis of elemental composition.</p> Results <p>Biomass C content varied from 38.13% to 43.93%, while Si content varied from 0.31&#xa0;g&#xa0;kg<sup>−1</sup> to 41.54&#xa0;g&#xa0;kg<sup>−1</sup>. Both qualitative and quantitative characterization results demonstrated a substitution of Si for biomass C, which is a beneficial substitution. The estimated phytolith production flux of Job’s tears reached up to 576 ± 243&#xa0;kg&#xa0;ha⁻<sup>1</sup>&#xa0;yr⁻<sup>1</sup>, which was higher than that of the majority of crops, indicating that Job’s tears have a high potential of phytolith associated C sequestration. Furthermore, the relative contributions of leaf, husk, stem, and root to the whole-plant phytolith production flux of Job’s tears were 43%, 35.2%, 19.8%, and 2.1%, respectively.</p> Conclusions <p>Si substitution for biomass C synthesis and Si deposition for phytolith production are the two important Si–C coupling processes in Job’s tears. The two processes are beneficial to the growth and long-term C sequestration of Job’s tears.</p>

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Silicon accumulation in Job’s tears (Coix lacryma-jobi L.) partially replaces biomass carbon synthesis and enhances phytolith associated carbon sequestration potential

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Dongchen Ruan,
  • Xiaomin Yang,
  • Zimin Li,
  • Jianhong Liu,
  • Hai Xu,
  • Jiayi Jiang,
  • Qixin Wu,
  • Yongqiang Yuan

摘要

Background and aims

Cropland ecosystem plays an important role in terrestrial carbon (C) sequestration through silicon (Si)-C coupled biogeochemical cycle. Herein, we want to investigate potential Si–C coupling processes and preliminarily assess the phytolith associated C sequestration potential of Job’s tears (Coix lacryma-jobi L.).

Methods

Plant samples of Job’s tears, including roots, stems, leaves, husks, and grains, were collected from Guizhou Province, China. A modified wet digestion method of H₂O₂-HNO₃ was employed to extract phytoliths from collected plant samples. Field emission scanning electron microscopy coupled with energy-dispersive spectroscopy (FESEM-EDS) was employed to observe the morphology of relevant samples and perform semi-quantitative analysis of elemental composition.

Results

Biomass C content varied from 38.13% to 43.93%, while Si content varied from 0.31 g kg−1 to 41.54 g kg−1. Both qualitative and quantitative characterization results demonstrated a substitution of Si for biomass C, which is a beneficial substitution. The estimated phytolith production flux of Job’s tears reached up to 576 ± 243 kg ha⁻1 yr⁻1, which was higher than that of the majority of crops, indicating that Job’s tears have a high potential of phytolith associated C sequestration. Furthermore, the relative contributions of leaf, husk, stem, and root to the whole-plant phytolith production flux of Job’s tears were 43%, 35.2%, 19.8%, and 2.1%, respectively.

Conclusions

Si substitution for biomass C synthesis and Si deposition for phytolith production are the two important Si–C coupling processes in Job’s tears. The two processes are beneficial to the growth and long-term C sequestration of Job’s tears.