Silicon fractionations at the margin of a coastal wetland and its response to sea level rise
文献类型： 外文期刊
作者： Zhao, Xiangwei 1 ; Zhang, Xiaodong 1 ; Li, Zimin 3 ; Van Zwieten, Lukas 4 ; Wang, Yidong 5 ; Hao, Qian 1 ; Wei, Yuqiu 6 ; Ran, Xiangbin 7 ; Yang, Xiaomin 8 ; Song, Zhaoliang 1 ; Wang, Hailong 9 ;
作者机构： 1.Tianjin Univ, Inst Surface Earth Syst Sci, Sch Earth Syst Sci, Tianjin 300072, Peoples R China
2.Tianjin Univ, Tianjin Key Lab Earth Crit Zone Sci & Sustainable, Tianjin, Peoples R China
3.Univ Catholique Louvain UCLouvain, Earth & Life Inst, Soil Sci, Croix Sud 2,L7 05-10, B-1348 Louvain La Neuve, Belgium
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.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Key Lab Sustainable Dev Marine Fisheries, Minist Agr & Rural Affairs, Qingdao, Peoples R China
7.Minist Nat Resources, Inst Oceanog 1, Res Ctr Marine Ecol, Qingdao 266061, Peoples R China
8.Guizhou Univ, Coll Resources & Environm Engn, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang 550025, Peoples R China
9.Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China
10.Zhejiang A&F Univ, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou 311300, Zhejiang, Peoples R China
11.Tianjin Univ, Sch Earth Syst Sci, 92 Weijin Rd, Tianjin 300072, Peoples R China
关键词： Biogeochemical silicon cycling; Margin erosion; Sea level rise; Coastal wetland
期刊名称：GEODERMA （ 影响因子：6.1； 五年影响因子：7.0 ）
ISSN： 0016-7061
年卷期： 2023 年 437 卷
页码：
收录情况： SCI
摘要： Silicon (Si) and its biogeochemical cycling play an important role in maintaining the functions of terrestrial and marine ecosystems. However, the effects of sea level rise on the biogeochemical cycling of Si in coastal wetlands remain poorly understood. To explore this impact on biogeochemical Si cycling, we sampled a gradient from sediment to soil without the impact of tidal inundation in the Beidagang Wetland Nature Reserve, and then assayed non-crystalline Si (labile Si), including mobile Si (CaCl2-Si), adsorbed Si (Acetic-Si), Si bound to soil organic matter (H2O2-Si), Si occluded in pedogenic oxides/hydroxide (Oxalate-Si), and amorphous Si (Na2CO3Si) fractions. Analytical results showed that the content of CaCl2-Si ranged from 13.0 to 53.3 mg kg-1 and the content of Acetic-Si ranged from 32.3 to 80.9 mg kg � 1, both of which were lower in sediments compared to soils. The content of H2O2-Si (84.1-160.1 mg kg � 1) and Oxalate-Si (306.6-655.1 mg kg � 1) in the soil profiles showed non-significant variations along the sampling slope. The Na2CO3-Si fraction accounted for 82%-90% of labile Si in soil and sediment, mainly being contributed from phytoliths or diatoms. Diatoms were only detected in sediment profiles. The storage of labile Si in sediment was significantly (p = 0.0009) lower than the storage in soil, suggesting that the coastal wetland ecosystems are an important source of Si to the estuary. With future sea level rise and increased margin erosion, the inter-transformation processes among different Si fractions would likely be weakened to increase dissolved Si for marine diatoms.
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