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Fregolente LG, Rodrigues MT, Oliveira NC, Araújo BS, Nascimento ÍV, Souza Filho AG, Paula AJ, Costa MCG, Mota JCA, Ferreira OP. Effects of chemical aging on carbonaceous materials: Stability of water-dispersible colloids and their influence on the aggregation of natural-soil colloid. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 903:166835. [PMID: 37678531 DOI: 10.1016/j.scitotenv.2023.166835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 09/01/2023] [Accepted: 09/02/2023] [Indexed: 09/09/2023]
Abstract
Although hydrochar and biochar have been used as soil conditioners, there is not a clear understanding of how their properties changes due to aging impacts their colloidal particles behavior on the soil system. From this premise, we produced hydrochar and biochar from the same feedstock (cashew bagasse) and aged with different chemical methods: (i) using hydrogen peroxide, (ii) a mixture of nitric and sulfuric acids, and (iii) hot water. It was analyzed the effects of aging on the stability of the carbonaceous materials (CMs) colloids in aqueous medium with different ionic strength (single systems), as well as the stability of the natural-soil colloid when interacting with biochar and hydrochar colloids (binary systems). A chemical composition (C, H, N, and O content) change in CMs due to the chemically induced aging was observed along with minor structural modifications. Chemical aging could increase the amount of oxygen functional groups for both biochar and hydrochar, though in a different level depending on the methodology applied. In this sense, hydrochar was more susceptive to chemical oxidation than biochar. The effectiveness of chemical aging treatments for biochar increased in the order of water < acid < hydrogen peroxide, whereas for hydrochar the order was water < hydrogen peroxide < acid. While the increase in surface oxidation improved the biochar colloidal stability in water medium at different ionic strengths (single systems), the stability and critical coagulation concentration (CCC) slightly changed for hydrochar. Natural-soil clay (NSC) interactions with oxidized carbonaceous material colloids (binary systems) enhanced NSC stability, which is less likely to aggregate. Therefore, the aging of carbonaceous materials modifies the interaction and dynamics of soil small particles, requiring far more attention to the environmental risks due to their application over time.
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Affiliation(s)
- Laís G Fregolente
- Physics Department, Universidade Federal do Ceará, Fortaleza, Ceará State postcode 60455-900, Brazil.
| | - Maria T Rodrigues
- Physics Department, Universidade Federal do Ceará, Fortaleza, Ceará State postcode 60455-900, Brazil
| | - Naiara C Oliveira
- Physics Department, Universidade Federal do Ceará, Fortaleza, Ceará State postcode 60455-900, Brazil
| | - Bruno Sousa Araújo
- Physics Department, Universidade Federal do Ceará, Fortaleza, Ceará State postcode 60455-900, Brazil
| | - Ícaro V Nascimento
- Soil Science Department, Universidade Federal do Ceará, Fortaleza, Ceará State postcode 60455-900, Brazil
| | - Antonio G Souza Filho
- Physics Department, Universidade Federal do Ceará, Fortaleza, Ceará State postcode 60455-900, Brazil
| | - Amauri J Paula
- Physics Department, Universidade Federal do Ceará, Fortaleza, Ceará State postcode 60455-900, Brazil; Ilum School of Science, Centro Nacional de Pesquisa em Energia e Materiais - CNPEM, Campinas, São Paulo State, Brazil
| | - Mirian C G Costa
- Soil Science Department, Universidade Federal do Ceará, Fortaleza, Ceará State postcode 60455-900, Brazil
| | - Jaedson C A Mota
- Soil Science Department, Universidade Federal do Ceará, Fortaleza, Ceará State postcode 60455-900, Brazil
| | - Odair P Ferreira
- Physics Department, Universidade Federal do Ceará, Fortaleza, Ceará State postcode 60455-900, Brazil; Laboratório de Materiais Funcionais Avançados (LaMFA), Chemistry Department, Universidade Estadual de Londrina, Londrina, Paraná State postcode 86057-970, Brazil
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Huang Z, Zhang X, Peñuelas J, Sardans J, Jin Q, Wang C, Yang L, Fang Y, Li Z, Wang W. Industrial and agricultural waste amendments interact with microorganism activities to enhance P availability in rice-paddy soils. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 901:166364. [PMID: 37597547 DOI: 10.1016/j.scitotenv.2023.166364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/15/2023] [Accepted: 08/15/2023] [Indexed: 08/21/2023]
Abstract
Adding industrial and agricultural wastes to farmland can increase soil available phosphorus (P) pool and boost crop production, but the process affecting soil P transformation and bioavailability is still poorly understood. We studied the effects of straw (ST), biochar (BC) and Si-modified biochar (Si-BC) amendments on the available-P content and its fraction transformation in rice-paddy soils. Our results showed that these three soil amendments significantly increased the concentrations of both microbial biomass carbon (MBC) and microbial biomass-P (MBP) during the first rice season; by contrast, the effects of ST and BC application were relatively poor on acid-phosphatase (ACP) activity, which was increased by 24 % under ST and 14 % under BC. Soil total P concentrations did not differ significantly, although the concentration and percentage of each P-fraction were altered significantly among treatments. Although all three applications increase soil available-P concentration by promoting the transformation of organic-P (Po) components to inorganic-P (Pi), there are differences in the transformation efficiency of the soil P fraction between these amendments. Redundancy analysis results also showed significant clustering of soil P-fraction transformations after ST and BC treatments. Structural equation model analysis further indicated that all amendments regulated microbial processes by changing soil pH and dissolved organic carbon (DOC), thereby promoting soil P transformation and improving P efficiency. Sodium bicarbonate-extractable Po (NaHCO3-Po) contributed most to soil available-P under the different amendments. Compared to ST and Si-BC, BC application improved more soil microbial status and the transformation of soil unavailable-P into available-P, therefore the application of BC in rice fields is the most beneficial method to promote phosphorus use and production sustainability in rice. These findings helped to understand the effects of using industrial and agricultural waste (e.g. straw, biochar and Si-modified biochar) on soil P-fractions and so provided a reference for sustainable resource use and green production in rice-paddy ecosystems.
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Affiliation(s)
- Zhuang Huang
- Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350117, China; Institute of Geography, Fujian Normal University, Fuzhou 350117, China
| | - Xiaoqing Zhang
- Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350117, China; Institute of Geography, Fujian Normal University, Fuzhou 350117, China
| | - Josep Peñuelas
- CSIC, Global Ecology Unit, CREAF-CSIC-UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain; CREAF, Cerdanyola del Vallès 08193, Catalonia, Spain
| | - Jordi Sardans
- CSIC, Global Ecology Unit, CREAF-CSIC-UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain; CREAF, Cerdanyola del Vallès 08193, Catalonia, Spain
| | - Qiang Jin
- College of Resources and Environmental Science and Engineering, Hubei University of Science and Technology, Xianning 437100, China
| | - Chun Wang
- Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350117, China; Institute of Geography, Fujian Normal University, Fuzhou 350117, China.
| | - Liuming Yang
- Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350117, China; Institute of Geography, Fujian Normal University, Fuzhou 350117, China.
| | - Yunying Fang
- Australian Rivers Institute and School of Environment and Science, Griffith University, Nathan Campus, Queensland 4111, Australia
| | - Zimin Li
- Earth and Life Institute, Soil Science, Université Catholique de Louvain (UCLouvain), Croix du Sud 2, L7.05.10, 1348 Louvain-La-Neuve, Belgium
| | - Weiqi Wang
- Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350117, China; Institute of Geography, Fujian Normal University, Fuzhou 350117, China
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Jin J, Khan S, Mohamed Eltohamy K, He S, Liu C, Li F, Liang X. Biochar-coupled organic fertilizer reduced soil water-dispersible colloidal phosphorus contents in agricultural fields. CHEMOSPHERE 2023; 333:138963. [PMID: 37201601 DOI: 10.1016/j.chemosphere.2023.138963] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 05/04/2023] [Accepted: 05/15/2023] [Indexed: 05/20/2023]
Abstract
Soil water-dispersible colloidal phosphorus (WCP) presents high mobility, however, the regulatory effect of biochar-coupled organic fertilizer is rarely known, especially under different cropping patterns. This study investigated the P adsorption, soil aggregate stability, and WCP in three paddy and three vegetable fields. These soils were amended with different fertilizers (chemical fertilizer, CF; substitution of solid-sheep manure or liquid-biogas slurry organic fertilizer, SOF/LOF; substitution of biochar-coupled organic fertilizers, BSOF/BLOF). Results presented that the LOF averagely increased the WCP contents by 50.2% across the sites, but the SOF and BSOF/BLOF averagely decreased their contents by 38.5% and 50.7% in comparison with the CF. The WCP decline in the BSOF/BLOF-amended soils was mainly attributed to the intensive P adsorption capacity and soil aggregate stability. The BSOF/BLOF increased the amorphous Fe and Al contents in the fields in comparison with the CF, which improved the adsorption capacity of soil particles, further improving the maximum absorbed P (Qmax) and reducing the dissolved organic matter (DOC), leading to the improvement of > 2 mm water-stable aggregate (WSA>2mm) and subsequent WCP decrease. This was proved by the remarkable negative associations between the WCP and Qmax (R2 = 0.78, p < 0.01) and WSA>2mm (R2 = 0.74, p < 0.01). This study manifests that biochar-coupled organic fertilizer could effectively reduce soil WCP content via the improvement of P adsorption and aggregate stability.
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Affiliation(s)
- Junwei Jin
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou, 310058, PR China
| | - Sangar Khan
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou, 310058, PR China; Department of Geography and Spatial Information Techniques, Ningbo University, Ningbo, 315211, PR China
| | - Kamel Mohamed Eltohamy
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou, 310058, PR China; Department of Water Relations & Field Irrigation, National Research Centre, Dokki, Cairo, 12622, Egypt
| | - Shuang He
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou, 310058, PR China
| | - Chunlong Liu
- Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, 130102, PR China
| | - Fayong Li
- College of Water Resources and Architectural Engineering, Tarim University, Xinjiang, 843300, PR China
| | - Xinqiang Liang
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou, 310058, PR China; Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, 130102, PR China.
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Wareppam B, Kuzmann E, Garg VK, Singh LH. Mössbauer spectroscopic investigations on iron oxides and modified nanostructures: A review. JOURNAL OF MATERIALS RESEARCH 2022; 38:937-957. [PMID: 36059887 PMCID: PMC9423703 DOI: 10.1557/s43578-022-00665-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 07/15/2022] [Indexed: 06/15/2023]
Abstract
Pure and doped iron oxide and hydroxide nanoparticles are highly potential materials for biological, environment, energy and other technological applications. On demand of the applications, single phase as well as multiple phase of different polymorphs or composites of iron oxides with compatible materials for example, zeolite, SiO2, or Au are prepared. The properties of the as-synthesized nanoparticles are predominantly dictated by the local structure and the distribution of the cations. Mössbauer spectroscopy is a perfect and efficient characterization technique to investigate the local structure of the Mössbauer-active element such as Fe, Au, and Sn. In the present review, the local structure transformation on the optimization of the magnetite coexisted with iron hydroxides, spin dynamics of the bare, caped, core-shell and the composites of iron oxide nanoparticles (IONPs), dipole-dipole interactions and the diffusion of IONPs were discussed, based on the findings using Mössbauer spectroscopy.
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Affiliation(s)
- Boris Wareppam
- Department of Physics, National Institute of Technology Manipur, Langol, 795004 India
| | - Ernő Kuzmann
- Department of Analytical Chemistry, Institute of Chemistry, Eötvös Loránd University, Pázmány Péter Sétány 1/A, Budapest, 1117 Hungary
| | - Vijayendra K. Garg
- Institute of Physics, University of Brasília, Brasília, DF 70919-970 Brazil
| | - L. Herojit Singh
- Department of Physics, National Institute of Technology Manipur, Langol, 795004 India
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Lin S, Wang W, Sardans J, Lan X, Fang Y, Singh BP, Xu X, Wiesmeier M, Tariq A, Zeng F, Alrefaei AF, Peñuelas J. Effects of slag and biochar amendments on microorganisms and fractions of soil organic carbon during flooding in a paddy field after two years in southeastern China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 824:153783. [PMID: 35176355 DOI: 10.1016/j.scitotenv.2022.153783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 01/27/2022] [Accepted: 02/06/2022] [Indexed: 06/14/2023]
Abstract
Incorporating amendments of industrial waste such as biochar and steel slag in cropland has been used to enhance the storage of soil organic carbon (SOC) while sustaining crop production. Short-term laboratory and field studies have identified important influences of biochar on active SOC fractions associated with soil microbial activity in paddy soils, but the long-term effects remain poorly understood. To address these knowledge gaps, we examined the effects of slag, biochar, and slag+biochar treatments on total SOC concentration, active SOC fractions and soil microbial communities in a paddy field two years after incorporation. Across both two seasons, the addition of slag, biochar, slag+biochar increased soil salinity by 26-80%, 1.3-37% and 42-79%, and also increased soil pH by 0.8-5.7%, 2.1-2.4% and 4.0-6.3%, respectively, relative to the control. SOC concentration was higher in the slag, biochar, and slag+biochar treatments across both rice seasons by 4.3-5%, 0.5-17% and 4.3-7%, respectively. Soil C-pool activity and C-pool management indices in the late paddy season were significantly lower in the slag+biochar treatment than the control by 26.3 and 21.3%, respectively, indicating that the amendments contributed to the stability of SOC. The C concentrations of the biochar and slag amendments affected bacterial abundance more than fungal abundance and affected C cycling. Our study suggests that combined slag and biochar amendments may increase bacterial abundance that may maintain SOC storage and reduce the abundances of potential SOC decomposers in key functional genera, indicating strong coupling relationships with changes of soil properties such as salinity, pH, and SOC concentration. These outcomes due to the amendments (e.g. slag+biochar) may increase microbial C-use efficiency and support the stability of active SOC fractions, with opportunities for long-term C sequestration.
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Affiliation(s)
- Shaoying Lin
- Key Laboratory of Humid Subtropical Eco-Geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350007, China; Institute of Geography, Fujian Normal University, Fuzhou 350007, China
| | - Weiqi Wang
- Key Laboratory of Humid Subtropical Eco-Geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350007, China; Institute of Geography, Fujian Normal University, Fuzhou 350007, China.
| | - Jordi Sardans
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, 08913 Bellaterra, Catalonia, Spain; CREAF, 08913 Cerdanyola del Vallès, Catalonia, Spain.
| | - Xingfu Lan
- College of Life Science, Fujian Normal University, Fuzhou 350108, China
| | - Yunying Fang
- NSW Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Menangle, NSW 2568, Australia
| | - Bhupinder Pal Singh
- NSW Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Menangle, NSW 2568, Australia
| | - Xuping Xu
- College of Life Science, Fujian Normal University, Fuzhou 350108, China
| | - Martin Wiesmeier
- Chair of Soil Science, TUM School of Life Sciences Weihenstephan, Technical University of Munich, 85354 Freising, Germany
| | - Akash Tariq
- State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; Cele National Station of Observation and Research for Desert-Grassland Ecosystems, Cele 848300, China
| | - Fanjiang Zeng
- State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; Cele National Station of Observation and Research for Desert-Grassland Ecosystems, Cele 848300, China
| | - Abdulwahed Fahad Alrefaei
- Department of Zoology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Josep Peñuelas
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, 08913 Bellaterra, Catalonia, Spain; CREAF, 08913 Cerdanyola del Vallès, Catalonia, Spain
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Rombolà AG, Torri C, Vassura I, Venturini E, Reggiani R, Fabbri D. Effect of biochar amendment on organic matter and dissolved organic matter composition of agricultural soils from a two-year field experiment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 812:151422. [PMID: 34742976 DOI: 10.1016/j.scitotenv.2021.151422] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 10/08/2021] [Accepted: 10/31/2021] [Indexed: 05/16/2023]
Abstract
Dissolved organic matter (DOM) is an important organic matter fraction that plays a key role in many biological and chemical processes in soil. The effect of biochar addition on the content and composition of soil organic matter (SOM) and DOM in an agricultural soil in Italy was investigated within a two-year period. UV-Vis spectroscopy and analytical pyrolysis have been applied to study complex components in DOM soil samples. Additionally, analytical pyrolysis was used to provide qualitative information of SOM at molecular level and the properties of biochar before and one year after amendment. A method was developed to quantify biochar levels by thermogravimetric analysis that enabled to identify deviations from the amendment rate. The water-soluble organic carbon (WSOC) concentrations in the amended soils were significantly lower than those in the control soils, indicating that biochar decreased the leaching of DOM. DOM in treated soils was characterized by a higher aromatic character according to analytical pyrolysis and UV-Vis spectroscopy. Moreover, a relatively high abundance of compounds with N was observed in pyrolysates of treated soils, suggesting that biochar increased the proportion of microbial DOM. The results from thermal and spectroscopy techniques are consistent in highlighting significant changes in DOM levels and composition due to biochar application with important effects on soil carbon storage and cycling.
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Affiliation(s)
- Alessandro G Rombolà
- Department of Chemistry "Giacomo Ciamician" and C.I.R.I. MAM Tecnopolo di Rimini, University of Bologna, Via Dario Campana 71, 47192 Rimini, Italy.
| | - Cristian Torri
- Department of Chemistry "Giacomo Ciamician", University of Bologna, Campus di Ravenna, via Sant'Alberto 163, 48123 Ravenna, Italy
| | - Ivano Vassura
- Department of Industrial Chemistry "Toso-Montanari" and C.I.R.I. FRAME, University of Bologna, Campus di Rimini, via Dario Campana 71, 47922 Rimini, Italy
| | - Elisa Venturini
- Department of Industrial Chemistry "Toso-Montanari" and C.I.R.I. FRAME, University of Bologna, Campus di Rimini, via Dario Campana 71, 47922 Rimini, Italy
| | - Roberto Reggiani
- Experimental Farm Stuard SCRL, Strada Madonna dell'Aiuto 7/a, 43126 San Pancrazio, Parma, Italy
| | - Daniele Fabbri
- Department of Chemistry "Giacomo Ciamician" and C.I.R.I. MAM Tecnopolo di Rimini, University of Bologna, Via Dario Campana 71, 47192 Rimini, Italy
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Rasul M, Cho J, Shin HS, Hur J. Biochar-induced priming effects in soil via modifying the status of soil organic matter and microflora: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 805:150304. [PMID: 34536873 DOI: 10.1016/j.scitotenv.2021.150304] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 07/23/2021] [Accepted: 09/08/2021] [Indexed: 06/13/2023]
Abstract
Biochar (BC) application has the potential to be integrated into a carbon-trading framework owing to its multiple environmental and economic benefits. Despite the increasing research attention over the past ten years, the mechanisms of BC-induced priming effects on soil organic carbon mineralization and their influencing factors have not been systematically considered. This review aims to document the recent progress in BC research by focusing on (1) how BC-induced priming effects change the soil environment, (2) the factors governing the mechanisms underlying BC amendment effects on soils, and (3) how BC amendments alter soil microbial communities and nutrient dynamics. Here, we carried out a detailed examination of the origins of different biochar, its pyrolysis conditions, and potential interactions with various factors that affect BC characteristics and mechanisms of C mineralization in primed soil. These findings clearly addressed the strong linkage between BC properties and abiotic factors that leads to change the soil microclimate, priming effects, and carbon stabilization. This review offers an overview of a fragmented body of evidence and the current state of understanding to support the application of BC in different soil environments with the aim of sustaining or improving the agricultural crop production.
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Affiliation(s)
- Maria Rasul
- Department of Environment and Energy, Sejong University, Seoul 05006, South Korea
| | - Jinwoo Cho
- Department of Environment and Energy, Sejong University, Seoul 05006, South Korea
| | - Hyun-Sang Shin
- Department of Environment Energy Engineering, Seoul National University of Science & Technology, Seoul 01811, South Korea
| | - Jin Hur
- Department of Environment and Energy, Sejong University, Seoul 05006, South Korea.
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Chen X, Hu Y, Xia Y, Zheng S, Ma C, Rui Y, He H, Huang D, Zhang Z, Ge T, Wu J, Guggenberger G, Kuzyakov Y, Su Y. Contrasting pathways of carbon sequestration in paddy and upland soils. GLOBAL CHANGE BIOLOGY 2021; 27:2478-2490. [PMID: 33713528 PMCID: PMC8251767 DOI: 10.1111/gcb.15595] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Revised: 02/05/2021] [Accepted: 03/01/2021] [Indexed: 05/28/2023]
Abstract
Paddy soils make up the largest anthropogenic wetlands on earth, and are characterized by a prominent potential for organic carbon (C) sequestration. By quantifying the plant- and microbial-derived C in soils across four climate zones, we identified that organic C accrual is achieved via contrasting pathways in paddy and upland soils. Paddies are 39%-127% more efficient in soil organic C (SOC) sequestration than their adjacent upland counterparts, with greater differences in warmer than cooler climates. Upland soils are more replenished by microbial-derived C, whereas paddy soils are enriched with a greater proportion of plant-derived C, because of the retarded microbial decomposition under anaerobic conditions induced by the flooding of paddies. Under both land-use types, the maximal contribution of plant residues to SOC is at intermediate mean annual temperature (15-20°C), neutral soil (pH~7.3), and low clay/sand ratio. By contrast, high temperature (~24°C), low soil pH (~5), and large clay/sand ratio are favorable for strengthening the contribution of microbial necromass. The greater contribution of microbial necromass to SOC in waterlogged paddies in warmer climates is likely due to the fast anabolism from bacteria, whereas fungi are unlikely to be involved as they are aerobic. In the scenario of land-use conversion from paddy to upland, a total of 504 Tg C may be lost as CO2 from paddy soils (0-15 cm) solely in eastern China, with 90% released from the less protected plant-derived C. Hence, preserving paddy systems and other anthropogenic wetlands and increasing their C storage through sustainable management are critical for maintaining global soil C stock and mitigating climate change.
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Affiliation(s)
- Xiangbi Chen
- Key Laboratory of Agro‐ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaPR China
- College of Resources and Environmental SciencesHunan Agricultural UniversityChangshaPR China
| | - Yajun Hu
- Key Laboratory of Agro‐ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaPR China
| | - Yinhang Xia
- Key Laboratory of Agro‐ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaPR China
- College of Resources and Environmental SciencesHunan Agricultural UniversityChangshaPR China
| | - Shengmeng Zheng
- Key Laboratory of Agro‐ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaPR China
| | - Chong Ma
- Key Laboratory of Agro‐ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaPR China
| | | | - Hongbo He
- Institute of Applied EcologyChinese Academy of SciencesShenyangPR China
| | - Daoyou Huang
- Key Laboratory of Agro‐ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaPR China
| | - Zhenhua Zhang
- College of Resources and Environmental SciencesHunan Agricultural UniversityChangshaPR China
| | - Tida Ge
- Key Laboratory of Agro‐ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaPR China
| | - Jinshui Wu
- Key Laboratory of Agro‐ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaPR China
| | | | - Yakov Kuzyakov
- Department of Soil Science of Temperate EcosystemsDepartment of Agricultural Soil ScienceUniversity of GöttingenGöttingenGermany
- Agro‐Technological InstituteRUDN UniversityMoscowRussia
| | - Yirong Su
- Key Laboratory of Agro‐ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaPR China
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