Organic matter composition and stability in estuarine wetlands depending on soil salinity

被引：3

作者：

Wu, Lele ^{[1
,2
]}

Song, Zhaoliang ^{[1
,2
,3
]}

Wu, Yuntao ^{[4
]}

Xia, Shaopan ^{[5
]}

Kuzyakov, Yakov ^{[6
,7
,8
]}

Hartley, Iain P. ^{[9
]}

Fang, Yunying ^{[10
]}

Yu, Changxun ^{[11
]}

Wang, Yidong ^{[12
]}

Chen, Ji ^{[13
,14
]}

Guo, Laodong ^{[15
]}

Li, Zimin ^{[13
]}

Zhao, Xiangwei ^{[1
,2
]}

Yang, Xiaomin ^{[16
]}

Zhang, Zhenqing ^{[12
]}

Liu, Shuyan ^{[17
]}

Wang, Weiqi ^{[18
]}

Ran, Xiangbin ^{[19
]}

Liu, Cong-Qiang ^{[1
,2
,3
]}

Wang, Hailong ^{[20
,21
]}

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] Haihe Lab Sustainable Chem Transformat, Tianjin, Peoples R China

[4] Lishui Univ, Coll Ecol, Lishui 323000, Zhejiang, Peoples R China

[5] Nanjing Agr Univ, Inst Resource Ecosyst & Environm Agr, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China

[6] Univ Goettingen, Dept Soil Sci Temperate Ecosyst, Dept Agr Soil Sci, D-37077 Gottingen, Germany

[7] RUDN Univ, Peoples Friendship Univ Russia, Moscow 117198, Russia

[8] Univ Exeter, Coll Life & Environm Sci, Geog, Exeter, England

[9] Kazan Fed Univ, Inst Environm Sci, Kazan 420049, Russia

[10] Griffith Univ, Australian Rivers Inst, Sch Environm & Sci, Nathan 4111, Australia

[11] Linnaeus Univ, Dept Biol & Environm Sci, Kalmar, Sweden

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

[13] Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China

[14] Aarhus Univ, Dept Agroecol, DK-8830 Tjele, Denmark

[15] Univ Wisconsin Milwaukee, Sch Freshwater Sci, Milwaukee, WI USA

[16] Guizhou Univ, Coll Resources & Environm Engn, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang 550025, Peoples R China

[17] Natl Nat Reserve Management Ctr Liujiang Basin Geo, Qinhuangdao, Peoples R China

[18] Fujian Normal Univ, Key Lab Humid Subtrop Ecogeog Proc, Minist Educ, Fuzhou, Peoples R China

[19] Minist Nat Resources, Inst Oceanog 1, Qingdao, Peoples R China

[20] Foshan Univ, Sch Environm & Chem Engn, Foshan, Peoples R China

[21] Guangdong Acad Sci, Inst Ecoenvironm & Soil Sci, Guangdong Prov Key Lab Integrated Agroenvironm Pol, Guangzhou 510650, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2024年 / 945卷

基金：

中国国家自然科学基金;

关键词：

Particulate organic matter; Mineral-associated organic matter; Tidal wetlands; Sea-level rise; Blue carbon; Vegetation habitats; Salinity gradient; CARBON FRACTIONS; COASTAL WETLANDS; ROOT EXUDATION; STABILIZATION; TURNOVER; IMPACTS; SEQUESTRATION; ASSOCIATIONS; SATURATION; EXTRACTION;

D O I：

10.1016/j.scitotenv.2024.173861

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Coastal wetlands are key players in mitigating global climate change by sequestering soil organic matter. Soil organic matter consists of less stable particulate organic matter (POM) and more stable mineral -associated organic matter (MAOM). The distribution and drivers of MAOM and POM in coastal wetlands have received little attention, despite the processes and mechanisms differ from that in the upland soils. We explored the distribution of POM and MAOM, their contributions to SOM, and the controlling factors along a salinity gradient in an estuarine wetland. In the estuarine wetland, POM C and N were influenced by soil depth and vegetation type, whereas MAOM C and N were influenced only by vegetation type. In the estuarine wetland, SOM was predominantly in the form of MAOM ( > 70 %) and increased with salinity (70 % -76 %), leading to long-term C sequestration. Both POM and MAOM increased with SOM, and the increase rate of POM was higher than that of MAOM. Aboveground plant biomass decreased with increasing salinity, resulted in a decrease in POM C (46 % - 81 %) and N (52 % -82 %) pools. As the mineral amount and activity, and microbial biomass decreased, the MAOM C (2.5 % -64 %) and N pool (8.6 % -59 %) decreased with salinity. When evaluating POM, the most influential factors were microbial biomass carbon (MBC) and dissolved organic carbon (DOC). Key parameters, including MBC, DOC, soil salinity, soil water content, aboveground plant biomass, mineral content and activity, and bulk density, were identified as influencing factors for both MAOM abundance. Soil water content not only directly controlled MAOM, but together with salinity also indirectly regulated POM and MAOM by controlling microbial biomass and aboveground plant biomass. Our findings have important implications for improving the accumulation and increased stability of soil organic matter in coastal wetlands, considering the global sea level rise and increased frequency of inundation.

引用

页数：12

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