文献类型： 外文期刊

作者： Zhao, Xiangwei ¹ ; Song, Zhaoliang ¹ ; Van Zwieten, Lukas ⁴ ; Wang, Yidong ⁵ ; Ran, Xiangbin ⁶ ; Hao, Qian ¹ ; Zhang, Juqin ¹ ; Li, Zimin ⁷ ; Sun, Jun ⁹ ; Wei, Yuqiu ¹⁰ ; Wu, Lele ¹ ; Liu, Shuyan ¹¹ ; Liu, Cong-Qiang ¹ ; Wu, Yuntao ¹² ; Wang, Hailong ³ ;

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.Tianjin Normal Univ, Sch Geog & Environm Sci, Tianjin Key Lab Water Resources & Environm, Tianjin, Peoples R China

6.Minist Nat Resources, Inst Oceanog 1, Res Ctr Marine Ecol, Qingdao 266061, Peoples R China

7.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China

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

9.China Univ Geosci, Inst Adv Marine Res i, Guangzhou 511462, Peoples R China

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

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

12.Lishui Univ, Coll Ecol, Lishui 323000, Zhejiang, Peoples R China

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

14.Guangdong Acad Sci, Inst Ecoenvironm & Soil Sci, Guangdong Prov Key Lab Integrated Agroenvironm Pol, Guangzhou 510650, Peoples R China

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

关键词： Si fraction; Si bioavailability; Biogenic silica; Biogeochemical Si cycle; Bohai Rim region

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2024 年 912 卷

页码：

收录情况： SCI

摘要： Coastal wetland sediment is important reservoir for silicon (Si), and plays an essential role in controlling its biogeochemical cycling. However, little is known about Si fractionations and the associated factors driving their transformations in coastal wetland sediments. In this study, we applied an optimized sequential Si extraction method to separate six sub-fractions of non-crystalline Si (Sinoncry) in sediments from two coastal wetlands, including Si in dissolved silicate (Sidis), Si in the adsorbed silicate (Siad), Si bound to organic matter (Siorg), Si occluded in pedogenic oxides and hydroxides (Siocc), Si in biogenic amorphous silica (Siba), and Si in pedogenic amorphous silica (Sipa). The results showed that the highest proportion of Si in the Sinoncry fraction was Siba (up to 6.6 % of total Si (Sitot)), followed by the Sipa (up to 1.8 % of Sitot). The smallest proportion of Si was found in the Sidis and Siad fractions with the sum of both being <0.1 % of the Sitot. We found a lower Siocc content (188 +/- 96.1 mg kg- 1 ) when compared to terrestrial soils. The Sidis was at the center of the inter-transformation among Si fractions, regulating the biogeochemical Si cycling of coastal wetland sediments. Redundancy analysis (RDA) combined with Pearson's correlations further showed that the basic biogenic elements (total organic carbon and total nitrogen), pH, and sediment salinity collectively controlled the Si fractionations in coastal wetland sediments. Our research optimizes sediment Si fractionation procedure and provides insights into the role of sedimentary Si fractions in controlling Si dynamics and knowledge for unraveling the biogeochemical Si cycling in coastal ecosystems.