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Qi JY, Yao XB, Lu J, He LX, Cao JL, Kan ZR, Wang X, Pan SG, Tang XR. A 40 % paddy surface soil organic carbon increase after 5-year no-tillage is linked with shifts in soil bacterial composition and functions. Sci Total Environ 2023; 859:160206. [PMID: 36400297 DOI: 10.1016/j.scitotenv.2022.160206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 10/26/2022] [Accepted: 11/11/2022] [Indexed: 06/16/2023]
Abstract
Soil organic carbon (SOC) is related to soil fertility, crop yield, and climate change mitigation. Paddy soil is a significant carbon (C) sink, but its C sequestration potential has not been realized as the various driving factors are still not fully understood. We performed a 5-year paddy field experiment in southern China to estimate tillage effects on SOC accumulation and its relation with soil bacteria. The C input from rice residue, SOC content, CO2 flux, soil bacterial community composition, and predicted functions were analyzed. No-tillage (NT) increased (p < 0.05) rice residue C inputs (by 12.6 %-15.9 %), SOC (by 40 % at the surface soil layer compared with conventional tillage, CT), and CO2 fluxes compared with reduced tillage (RT) and CT. Also, NT significantly altered the soil bacterial community. The random forest model showed that the predicted bacterial functions of "Degradation/Utilization/Assimilation Other", "C1 Compound Assimilation", and "Amin and Polyamine Degradation" were the most important functions associated with SOC accumulation. Analysis of metabolic pathway differences indicated that NT significantly decreased the BENZCOA-PWY (anaerobic aromatic compound degradation) and the AST-PWY (L-arginine degradation II). Therefore, the rapid paddy SOC increase is associated with both residue C input (from higher rice yields) and the degradation functions regulated by soil bacteria.
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Affiliation(s)
- Jian-Ying Qi
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, Guangzhou 510642, China; Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
| | - Xiang-Bin Yao
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, Guangzhou 510642, China; Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
| | - Jian Lu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, Guangzhou 510642, China; Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
| | - Long-Xin He
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, Guangzhou 510642, China; Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
| | - Jun-Li Cao
- Shanxi Center for Testing of Functional Agro⁃Products, Shanxi Agricultural University, Taiyuan 030031, China
| | - Zheng-Rong Kan
- College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
| | - Xing Wang
- College of Agronomy, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Sheng-Gang Pan
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, Guangzhou 510642, China; Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
| | - Xiang-Ru Tang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, Guangzhou 510642, China; Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China; Guangzhou Key Laboratory for Science and Technology of Fragrant Rice, Guangzhou 510642, China.
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Grellier S, Janeau JL, Dang Hoai N, Nguyen Thi Kim C, Le Thi Phuong Q, Pham Thi Thu T, Tran-Thi NT, Marchand C. Changes in soil characteristics and C dynamics after mangrove clearing (Vietnam). Sci Total Environ 2017; 593-594:654-663. [PMID: 28364605 DOI: 10.1016/j.scitotenv.2017.03.204] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 03/17/2017] [Accepted: 03/21/2017] [Indexed: 06/07/2023]
Abstract
Of the blue carbon sinks, mangroves have one of the highest organic matter (OM) storage capacities in their soil due to low mineralization processes resulting from waterlogging. However, mangroves are disappearing worldwide because of demographic increases. In addition to the loss of CO2 fixation, mangrove clearing can strongly affect soil characteristics and C storage. The objectives of the present study were to quantify the evolution of soil quality, carbon stocks and carbon fluxes after mangrove clearing. Sediment cores to assess physico-chemical properties were collected and in situ CO2 fluxes were measured at the soil-air interface in a mangrove of Northern Vietnam. We compared a Kandelia candel mangrove forest with a nearby zone that had been cleared two years before the study. Significant decrease of clay content and an increase in bulk density for the upper 35cm in the cleared zone were observed. Soil organic carbon (OC) content in the upper 35cm decreased by >65% two years after clearing. The quantity and the quality of the carbon changed, with lower carbon to nitrogen ratios, indicating a more decomposed OM, a higher content of dissolved organic carbon, and a higher content of inorganic carbon (three times higher). This highlights the efficiency of mineralization processes following clearing. Due to the rapid decrease in the soil carbon content, CO2 fluxes at sediment interface were >50% lower in the cleared zone. Taking into account carbonate precipitation after OC mineralization, the mangrove soil lost ~10MgOCha-1yr-1 mostly as CO2 to the atmosphere and possibly as dissolved forms towards adjacent ecosystems. The impacts on the carbon cycle of mangrove clearing as shown by the switch from a C sink to a C source highlight the importance of maintaining these ecosystems, particularly in a context of climate change.
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Affiliation(s)
- Séraphine Grellier
- Department of Spatial planning and Environment Engineering, CITERES UMR7324 CNRS, University of François Rabelais, Tours, France.
| | - Jean-Louis Janeau
- Institut de Recherche pour le Développement (IRD), iEES-Paris, UMR 242, IRD Bangkok, Thailand
| | - Nhon Dang Hoai
- Institute of Marine Environment and Resources (IMER, VAST), 246 Da Nang Street, Hai Phong City, Viet Nam
| | - Cuc Nguyen Thi Kim
- Department of Natural Resources Management, Thuy Loi University, 175, Tay Son, Dong Da, Ha Noi, Viet Nam; Mangrove Ecosystem Research Division (MERD), Centre for Natural Resources and Environmental Studies (CRES), Vietnam National University (VNU), 19 Le Thanh Tong, Ha Noi, Viet Nam
| | - Quynh Le Thi Phuong
- Institute of Natural Products Chemistry (INPC), Vietnam Academy of Science and Technology, 1H, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam
| | - Thao Pham Thi Thu
- Department of Water, Environment, Oceanography, University of Science and Technology of Hanoi (USTH), 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam
| | - Nhu-Trang Tran-Thi
- Faculty of Chemistry, University of Science - VNUHCM, 225 Nguyen Van Cu, Ho Chi Minh City, Viet Nam
| | - Cyril Marchand
- Faculty of Chemistry, University of Science - VNUHCM, 225 Nguyen Van Cu, Ho Chi Minh City, Viet Nam; Institut de Recherche pour le Développement (IRD), UMR 7590, UR 206, BP A5, 98848 Nouméa, New Caledonia, France
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