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Odebiri O, Mutanga O, Odindi J, Slotow R, Mafongoya P, Lottering R, Naicker R, Matongera TN, Mngadi M. Mapping Sub-surface Distribution of Soil Organic Carbon Stocks in South Africa's Arid and Semi-Arid Landscapes: Implications for Land Management and Climate Change Mitigation. GEODERMA REGIONAL 2024; 37:e00817. [PMID: 39015345 PMCID: PMC7616233 DOI: 10.1016/j.geodrs.2024.e00817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 07/18/2024]
Abstract
Soil organic carbon (SOC) stocks are critical for land management strategies and climate change mitigation. However, understanding SOC distribution in South Africa's arid and semi-arid regions remains a challenge due to data limitations, and the complex spatial and sub-surface variability in SOC stocks driven by desertification and land degradation. Thus, to support soil and land-use management practices as well as advance climate change mitigation efforts, there is an urgent need to provide more precise SOC stock estimates within South Africa's arid and semi-arid regions. Hence, this study adopted remote-sensing approaches to determine the spatial sub-surface distribution of SOC stocks and the influence of environmental co-variates at four soil depths (i.e., 0-30 cm, 30-60 cm, 60-100 cm, and 100-200 cm). Using two regression-based algorithms, i.e., Extreme Gradient Boosting (XGBoost) and Random Forest (RF), the study found the former (RMSE values ranging from 7.12 t/ha to 29.55 t/ha) to be a superior predictor of SOC in comparison to the latter (RMSE values ranging from 7.36 t/ha to 31.10 t/ha). Nonetheless, both models achieved satisfactory accuracy (R2 ≥ 0.52) for regional-scale SOC predictions at the studied soil depths. Thereafter, using a variable importance analysis, the study demonstrated the influence of climatic variables like rainfall and temperature on SOC stocks at different depths. Furthermore, the study revealed significant spatial variability in SOC stocks, and an increase in SOC stocks with soil depth. Overall, these findings enhance the understanding of SOC dynamics in South Africa's arid and semi-arid landscapes and emphasizes the importance of considering site specific topo-climatic characteristics for sustainable land management and climate change mitigation. Furthermore, the study offers valuable insights into sub-surface SOC distribution, crucial for informing carbon sequestration strategies, guiding land management practices, and informing environmental policies within arid and semi-arid environments.
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Affiliation(s)
- Omosalewa Odebiri
- School of Agricultural, Earth and Environmental Sciences, Discipline of Geography, University of KwaZulu-Natal, Pietermaritzburg, South Africa
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Melbourne, VIC 3125, Australia
| | - Onisimo Mutanga
- School of Agricultural, Earth and Environmental Sciences, Discipline of Geography, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - John Odindi
- School of Agricultural, Earth and Environmental Sciences, Discipline of Geography, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Rob Slotow
- Oppenheimer Fellow in Functional Biodiversity, Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, Pietermaritzburg, South Africa
- Department of Genetics, Evolution and Environment, University College London, London, UK
| | - Paramu Mafongoya
- Agronomy and Rural Development, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Scottsville, Pietermaritzburg, South Africa
| | - Romano Lottering
- School of Agricultural, Earth and Environmental Sciences, Discipline of Geography, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Rowan Naicker
- School of Agricultural, Earth and Environmental Sciences, Discipline of Geography, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Trylee Nyasha Matongera
- School of Agricultural, Earth and Environmental Sciences, Discipline of Geography, University of KwaZulu-Natal, Pietermaritzburg, South Africa
- Centre for Transformative Agriculture and Food Systems, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Mthembeni Mngadi
- School of Agricultural, Earth and Environmental Sciences, Discipline of Geography, University of KwaZulu-Natal, Pietermaritzburg, South Africa
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Lee J, Oh Y, Lee ST, Seo YO, Yun J, Yang Y, Kim J, Zhuang Q, Kang H. Soil organic carbon is a key determinant of CH 4 sink in global forest soils. Nat Commun 2023; 14:3110. [PMID: 37253779 DOI: 10.1038/s41467-023-38905-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Accepted: 05/16/2023] [Indexed: 06/01/2023] Open
Abstract
Soil organic carbon (SOC) is a primary regulator of the forest-climate feedback. However, its indicative capability for the soil CH4 sink is poorly understood due to the incomplete knowledge of the underlying mechanisms. Therefore, SOC is not explicitly included in the current model estimation of the global forest CH4 sink. Here, using in-situ observations, global meta-analysis, and process-based modeling, we provide evidence that SOC constitutes an important variable that governs the forest CH4 sink. We find that a CH4 sink is enhanced with increasing SOC content on regional and global scales. The revised model with SOC function better reproduces the field observation and estimates a 39% larger global forest CH4 sink (24.27 Tg CH4 yr-1) than the model without considering SOC effects (17.46 Tg CH4 yr-1). This study highlights the role of SOC in the forest CH4 sink, which shall be factored into future global CH4 budget quantification.
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Affiliation(s)
- Jaehyun Lee
- School of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
| | - Youmi Oh
- Global Monitoring Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - Sang Tae Lee
- Forest Technology and Management Research Center, National Institute of Forest Science, Gyeonggi, Korea
| | - Yeon Ok Seo
- Warm Temperate and Subtropical Forest Research Center, National Institute of Forest Science, Jeju, Korea
| | - Jeongeun Yun
- School of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
| | - Yerang Yang
- School of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
| | - Jinhyun Kim
- School of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
- Division of Life Sciences, Korea Polar Research Institute, Incheon, 21990, Korea
| | - Qianlai Zhuang
- Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, USA
| | - Hojeong Kang
- School of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea.
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Tang Q, Li Q, Tong L, Wu R, Xu J. Rhizospheric soil organic carbon accumulated but its molecular groups redistributed via rhizospheric soil microorganisms along multi-root Cerasus humilis plantation chronosequence at the karst rocky desertification control area. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023:10.1007/s11356-023-27588-9. [PMID: 37184792 DOI: 10.1007/s11356-023-27588-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 05/08/2023] [Indexed: 05/16/2023]
Abstract
Though the relationships between the microorganism communities and the edaphic factors in rhizosphere soil along the plantation chronosequence have been widely reported, few researches have appeared on the interrelationship about rhizospheric soil microorganism community and soil organic carbon (SOC) under multi-root Cerasus humilis plantations of different age. In our study, the rhizospheric soil microbial communities, soil physicochemistry, and SOC molecular groups in plantations of 1-, 3-, and 5-year-old Cerasus humilis were investigated in karst rocky desertification control area of southwest China. It was found that karst rhizospheric soil moisture, total nitrogen, available potassium, and 46-60 ppm N-alkyl/methoxyl C decreased; however, SOC and fungal:bacterial ratio decreased along multi-root Cerasus humilis plantation chronosequence. Proteobacteria, Actinobacteriota, Acidobacteriota, and Ascomycota were recognized as the top 4 phyla in the karst rhizospheric soil microbial co-occurrence network. Moreover, Cerasus humilis plantations exerted significantly direct effect on rhizospheric soil microbial communities and soil physicochemical properties exerted significantly direct effects on SOC molecular groups. Our results suggested that the increased Cerasus humilis plantation years will promote C sequestration (e.g., SOC) with the continued input of root litter, root exudates, and plant litter. The inputted and activated C can be preferentially consumed by rhizospheric soil microorganisms and converted into microbial-derived compounds, which are finally incorporated into recalcitrant SOC pools. Hence, Cerasus humilis redistributed SOC molecular groups via rhizospheric soil microorganisms, and increased ratio of fungi:bacteria in rhizosphere was associated with C sequestration which could not be regarded as a widespread rule. Though our study is the first attempt to recognize the interaction between rhizospheric soil microbial community and SOC molecular groups at the karst rocky desertification control area, it provides a baseline for further research that ecological restoration can promote soil C sequestration via soil microorganisms in the early period of eco-restoration at karst area.
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Affiliation(s)
- Qin Tang
- Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, Ministry of Natural Resources, Key Laboratory of Karst Dynamics, Ministry of Natural Resources & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, 541004, Guangxi, China
- School of Environmental Studies, China University of Geosciences, Wuhan, 430078, China
- International Research Center On Karst Under the Auspices of United Nations Educational, Scientific and Cultural Organization, Guilin, 541004, Guangxi, China
| | - Qiang Li
- Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, Ministry of Natural Resources, Key Laboratory of Karst Dynamics, Ministry of Natural Resources & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, 541004, Guangxi, China.
- International Research Center On Karst Under the Auspices of United Nations Educational, Scientific and Cultural Organization, Guilin, 541004, Guangxi, China.
| | - Lingchen Tong
- Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, Ministry of Natural Resources, Key Laboratory of Karst Dynamics, Ministry of Natural Resources & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, 541004, Guangxi, China
- International Research Center On Karst Under the Auspices of United Nations Educational, Scientific and Cultural Organization, Guilin, 541004, Guangxi, China
| | - Rui Wu
- Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, Ministry of Natural Resources, Key Laboratory of Karst Dynamics, Ministry of Natural Resources & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, 541004, Guangxi, China
- International Research Center On Karst Under the Auspices of United Nations Educational, Scientific and Cultural Organization, Guilin, 541004, Guangxi, China
| | - Jiao Xu
- Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, Ministry of Natural Resources, Key Laboratory of Karst Dynamics, Ministry of Natural Resources & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, 541004, Guangxi, China
- International Research Center On Karst Under the Auspices of United Nations Educational, Scientific and Cultural Organization, Guilin, 541004, Guangxi, China
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Impact of crop residue burning and tillage practices on soil biological parameters of rice–wheat agro-ecosystems. Trop Ecol 2023. [DOI: 10.1007/s42965-022-00287-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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Derrien D, Barré P, Basile-Doelsch I, Cécillon L, Chabbi A, Crème A, Fontaine S, Henneron L, Janot N, Lashermes G, Quénéa K, Rees F, Dignac MF. Current controversies on mechanisms controlling soil carbon storage: implications for interactions with practitioners and policy-makers. A review. AGRONOMY FOR SUSTAINABLE DEVELOPMENT 2023; 43:21. [PMID: 36777236 PMCID: PMC9901420 DOI: 10.1007/s13593-023-00876-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 01/16/2023] [Indexed: 06/17/2023]
Abstract
There is currently an intense debate about the potential for additional organic carbon storage in soil, the strategies by which it may be accomplished and what the actual benefits might be for agriculture and the climate. Controversy forms an essential part of the scientific process, but on the topic of soil carbon storage, it may confuse the agricultural community and the general public and may delay actions to fight climate change. In an attempt to shed light on this topic, the originality of this article lies in its intention to provide a balanced description of contradictory scientific opinions on soil carbon storage and to examine how the scientific community can support decision-making despite the controversy. In the first part, we review and attempt to reconcile conflicting views on the mechanisms controlling organic carbon dynamics in soil. We discuss the divergent opinions about chemical recalcitrance, the microbial or plant origin of persistent soil organic matter, the contribution of particulate organic matter to additional organic carbon storage in soil, and the spatial and energetic inaccessibility of soil organic matter to decomposers. In the second part, we examine the advantages and limitations of big data management and modeling, which are essential tools to link the latest scientific theories with the actions taken by stakeholders. Finally, we show how the analysis and discussion of controversies can guide scientists in supporting stakeholders for the design of (i) appropriate trade-offs for biomass use in agriculture and forestry and (ii) climate-smart management practices, keeping in mind their still unresolved effects on soil carbon storage.
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Affiliation(s)
| | - Pierre Barré
- Laboratoire de Géologie, École Normale Supérieure, CNRS, PSL University, IPSL, Paris, France
| | | | - Lauric Cécillon
- Laboratoire de Géologie, École Normale Supérieure, CNRS, PSL University, IPSL, Paris, France
| | - Abad Chabbi
- UMR EcoSys, INRAE, AgroParisTech, Université Paris-Saclay, 78850 Thiverval-Grignon, France
| | - Alexandra Crème
- UMR EcoSys, INRAE, AgroParisTech, Université Paris-Saclay, 78850 Thiverval-Grignon, France
| | - Sébastien Fontaine
- Université Clermont Auvergne, INRAE, VetAgro Sup, UMR Ecosystème Prairial, 63000 Clermont-Ferrand, France
| | - Ludovic Henneron
- USC ECODIV-Rouen 7603, Normandie Université, UNIROUEN, INRAE, 76000 Rouen, France
| | - Noémie Janot
- ISPA, Bordeaux Sciences Agro, INRAE, F-33140 Villenave d’Ornon, France
| | - Gwenaëlle Lashermes
- Université de Reims Champagne Ardenne, INRAE, FARE, UMR A 614, 51097 Reims, France
| | - Katell Quénéa
- Sorbonne Université, CNRS, EPHE, PSL, UMR METIS, F-75005 Paris, France
| | - Frédéric Rees
- UMR EcoSys, INRAE, AgroParisTech, Université Paris-Saclay, 78850 Thiverval-Grignon, France
| | - Marie-France Dignac
- INRAE, CNRS, Sorbonne Université, UMR iEES-Paris, 4 place Jussieu, 75005 Paris, France
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