文献类型： 外文期刊

作者： Zhao, Xiangwei ¹ ; Zhang, Xiaodong ¹ ; Song, Zhaoliang ¹ ; Van Zwieten, Lukas ⁴ ; Ran, Xiangbin ⁵ ; Pu, Yulin ⁶ ; Sun, Jun ⁷ ; Li, Qiang ¹ ; Wu, Lele ¹ ; Yang, Xiaomin ⁹ ; Wei, Yuqiu ¹⁰ ; Li, Zimin ¹¹ ; Liu, Shuyan ¹³ ; Song, Alin ¹⁴ ; Sun, Xiaole ¹⁵ ; Liu, Cong-Qiang ¹ ; Wang, Hailong ¹⁶ ;

作者机构： 1.Tianjin Univ, Inst Surface Earth Syst Sci, Sch Earth Syst Sci, Tianjin, Peoples R China

2.Tianjin Univ, Tianjin Key Lab Earth Crit Zone Sci & Sustainable, Tianjin, Peoples R China

3.Haihe Lab Sustainable Chem Transformat, Tianjin, Peoples R China

4.Wollongbar Primary Ind Inst, NSW Dept Primary Ind, Wollongbar, Australia

5.Minist Nat Resources, Inst Oceanog 1, Res Ctr Marine Ecol, Qingdao, Peoples R China

6.Sichuan Agr Univ, Coll Resource Sci, Chengdu, Peoples R China

7.China Univ Geosci, Inst Adv Marine Res, Guangzhou, Peoples R China

8.China Univ Geosci Wuhan, Coll Marine Sci & Technol, Wuhan, Peoples R China

9.Guizhou Univ, Coll Resources & Environm Engn, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang, Peoples R China

10.Chinese Acad Sci, Yellow Sea Fisheries Res Inst, Minist Agr & Rural Affairs, Key Lab Sustainable Dev Marine Fisheries, Qingdao 266071, Peoples R China

11.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Peoples R China

12.Univ Catholique Louvain UCLouvain, Earth & Life Inst, Soil Sci, Croix Sud 2,L7-05-10, B-1348 Louvain La Neuve, Belgium

13.Natl Nat Reserve Management Ctr Liujiang Basin Geo, Qinhuangdao, Peoples R China

14.Chinese Acad Agr Sci, Key Lab Plant Nutr & Fertilizer, Minist Agr, Inst Agr Resources & Reg Planning, Beijing, Peoples R China

15.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao, Peoples R China

16.Foshan Univ, Sch Environm & Chem Engn, Foshan, Peoples R China

17.Tianjin Univ, Sch Earth Syst Sci, 92 Weijin Rd, Tianjin 300072, Peoples R China

关键词： Blue carbon; Biogenic silica; Carbon sequestration; Biogeochemical silicon cycle; Sea-level rise; Coastal salt marsh

期刊名称：CATENA （ 影响因子：6.2； 五年影响因子：6.4 ）

ISSN： 0341-8162

年卷期： 2024 年 235 卷

页码：

收录情况： SCI

摘要： The fate of soil biogenic silica (BSi) in coastal salt marshes is of global importance because of its role in providing both available silicon (Si) for the growth of plants and diatoms and in sequestering carbon (C) (blue C) in soils and sediments. However, the accumulation of BSi and BSi-occluded C (BSiOC) under different vegetation habitats in coastal ecosystems, particularly in response to relative sea-level rise (RSLR), remains poorly understood. Here we established a paired waterlogging-control system and collected the soil samples under both waterlogged and non-waterlogged conditions from three vegetation habitats (single Phragmites australis, a mixture of P. australis and Suaeda salsa, and single S. salsa) corresponding to a gradient of distance from the coastline in three independent salt marshes. Our findings indicated that RSLR decreased average BSi content, especially in the 0-20 cm soil layer of the single P. australis and the mixed P. australis and S. salsa community. Although RSLR increased soil organic C (SOC) content, it generally decreased soil BSiOC content and its contribution to SOC. Consequently, RSLR resulted in lower soil BSi and BSiOC densities, particularly in the salt marsh dominated by the Si accumulator P. australis. Here, BSi and BSiOC densities at depths of 0-80 cm decreased by an average of 19% and 18% following waterlogging, respectively. The BSi pool was dominated by phytoliths in nonwaterlogged soils, while both diatoms and phytoliths were present in soils subjected to RSLR. Soil physicochemical properties including SOC, electrical conductivity and dissolved Si were influenced by RSLR. These factors, along with erosion were suggested as key influencers for BSi and its C sequestration in coastal salt marshes. Our results provide a scientific basis for elucidating biogeochemical Si cycles and predicting changes in BSiOC sequestration to optimize its storage.