The formation of humic acid and micro-aggregates facilitated long-time soil organic carbon sequestration after Medicago sativa L. introduction on abandoned farmlands
Song, Xin (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Yuan, Zi-Qiang (Lanzhou University)
Fang, Chao (Nanjing University of Information Science and Technology)
Hu, Zhenhong (Northwest A&F University)
Li, Feng-Min (Lanzhou University)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Date:	2024
Abstract:	The substantial carbon sequestration observed in abandoned farmland assumes a pivotal role in mitigating the impacts of global warming. However, it remains unclear how to effectively manage abandoned farmlands to achieve this goal, especially over the long term, and understand the underlying mechanisms. The introduction of legumes can augment vegetation coverage, mitigate soil erosion, and ameliorate soil quality. A long-term study has been conducted in the semiarid region of the Loess Plateau since 2003, with a focus on revegetation strategies involving the introduction of alfalfa (Medicago sativa L. ) and sweet clover (Melilotus officinalis L. ), while natural abandonment (fallow) served as a control. In this study, we utilized a physical-chemical combination approach to investigate the carbon sequestration process within the 0-20 cm soil layer. Our results demonstrated that, in comparison to the fallow, alfalfa introduction significantly increased soil organic carbon (SOC), light fraction organic carbon (LFOC), and heavy fraction organic carbon (HFOC) concentrations, whereas no significant differences were observed when comparing with sweet clover. The amount and proportion of humic acid (HA) within HFOC were notably higher in alfalfa fields compared to fallow fields. While soil wet-sieved macro-aggregates (.
Grants:	Agencia Estatal de Investigación PID2020-115770RB-I00 Agencia Estatal de Investigación TED2021-132627B-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-1333
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Alfalfa ; Heavy fraction organic carbon ; Soil aggregates ; HuminHumic acid ; Fulvic acid
Published in:	Geoderma, Vol. 445 (May 2024) , art. 116889, ISSN 1872-6259

DOI: 10.1016/j.geoderma.2024.116889

9 p, 3.7 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Research articles
Articles > Published articles