Biogenic Silica Composition and Storage in the Yellow River Delta Wetland with Implications for the Carbon Preservation

Jun Liu, Zhaoliang Song, Jianbu Wang, Alexander F. Bouwman, Menglu Li, Sen Liu, Lei Cao, Jiaye Zang, Xiangbin Ran*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The composition and accumulation of BSi and its role in C sequestration in the YRDW were quantified based on field investigation combined with remote sensing observation in the Yellow River Delta Wetland (YRDW). Results show that the soil BSi pool in the YRDW mainly consists of phytoliths. The pools of BSi, TOC, and BSi-occluded C (OCBSi) for aboveground plants in the YRDW are 7.6 g m−2, 129 g m−2 and 0.13 g m−2, respectively. Surface soil (0–10 cm) stocks of BSi, TOC, and OCBSi are 1780 g m−2, 840 g m−2 and 40 g m−2. Our results showed that BSi preservation efficiencies of BSi (52%) and (OCBSi) (51%) in deep soil layers exceed those of TOC (35%) based on the vertical variation of BSi in the sediment. Approximately 333 t of C fixed by plants is occluded in the phytoliths as OCBSi in the YRDW. Almost half of this OCBSi is preserved in the sediment in stable form. The YRDW is therefore an important sink for BSi and BSi-occluded C.

Original languageEnglish
Pages (from-to)1085-1095
Number of pages11
JournalWetlands
Volume40
Issue number10
DOIs
Publication statusPublished - 2020

Keywords

  • Biogenic silica (BSi)
  • BSi-occluded C (OC)
  • Carbon sequestration
  • Organic carbon
  • Phytoliths
  • Yellow River Delta wetland (YRDW)

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