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Mechanisms of litter input changes on soil organic carbon dynamics: a microbial carbon use efficiency-based perspective.
Zeng, Jia; Li, Xiangyang; Song, Rui; Xie, Haoxuan; Li, Xiangnan; Liu, Weichao; Liu, Hanyu; Du, Yaoyao; Xu, Miaoping; Ren, Chengjie; Yang, Gaihe; Han, Xinhui.
Afiliación
  • Zeng J; College of Agronomy, Northwest Agriculture & Forestry University, Yangling 712100, Shaanxi, PR China; Shaanxi Engineering Research Center of Circular Agriculture, Yangling 712100, Shaanxi, PR China.
  • Li X; College of Agronomy, Northwest Agriculture & Forestry University, Yangling 712100, Shaanxi, PR China; Shaanxi Engineering Research Center of Circular Agriculture, Yangling 712100, Shaanxi, PR China.
  • Song R; College of Agronomy, Northwest Agriculture & Forestry University, Yangling 712100, Shaanxi, PR China.
  • Xie H; College of Agronomy, Northwest Agriculture & Forestry University, Yangling 712100, Shaanxi, PR China.
  • Li X; College of Agronomy, Northwest Agriculture & Forestry University, Yangling 712100, Shaanxi, PR China.
  • Liu W; College of Agronomy, Northwest Agriculture & Forestry University, Yangling 712100, Shaanxi, PR China; Shaanxi Engineering Research Center of Circular Agriculture, Yangling 712100, Shaanxi, PR China.
  • Liu H; College of Agronomy, Northwest Agriculture & Forestry University, Yangling 712100, Shaanxi, PR China; Shaanxi Engineering Research Center of Circular Agriculture, Yangling 712100, Shaanxi, PR China.
  • Du Y; College of Agronomy, Northwest Agriculture & Forestry University, Yangling 712100, Shaanxi, PR China.
  • Xu M; Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, PR China.
  • Ren C; College of Agronomy, Northwest Agriculture & Forestry University, Yangling 712100, Shaanxi, PR China; Shaanxi Engineering Research Center of Circular Agriculture, Yangling 712100, Shaanxi, PR China.
  • Yang G; College of Agronomy, Northwest Agriculture & Forestry University, Yangling 712100, Shaanxi, PR China; Shaanxi Engineering Research Center of Circular Agriculture, Yangling 712100, Shaanxi, PR China.
  • Han X; College of Agronomy, Northwest Agriculture & Forestry University, Yangling 712100, Shaanxi, PR China. Electronic address: hanxinhui@nwsuaf.edu.cn.
Sci Total Environ ; 949: 175092, 2024 Nov 01.
Article en En | MEDLINE | ID: mdl-39079645
ABSTRACT
Plant litter is an important source of soil organic carbon (SOC) in terrestrial ecosystems, and the pattern of litter inputs is also influenced by global change and human activities. However, the current understanding of the impact of changes in litter inputs on SOC dynamics remains contentious, and the mechanisms by which changes in litter inputs affect SOC have rarely been investigated from the perspective of microbial carbon use efficiency (CUE). We conducted a 1-year experiment with litter treatments (no aboveground litter (NL), natural aboveground litter (CK), and double aboveground litter (DL)) in Robinia pseudoacacia plantation forest on the Loess Plateau. The objective was to assess how changes in litter input affect SOC accumulation in forest soils from the perspective of microbial CUE. Results showed that NL increased soil microbial C limitation by 77.11 % (0-10 cm) compared to CK, while it had a negligible effect on nitrogen and phosphorus limitation. In contrast, DL had no significant effect on soil microbial nutrient limitation. Furthermore, NL was found to significantly increase microbial CUE and decrease microbial metabolic quotient (QCO2), while the opposite was observed with DL. It is noteworthy that NL significantly contributed to an increase in SOC of 30.72 %, while DL had no significant effect on SOC. Correlation analysis showed that CUE was directly proportional to SOC and inversely proportional to QCO2. The partial least squares pathway model indicated that NL indirectly regulated the accumulation of SOC, mainly through two pathways promoting microbial CUE increase and reducing QCO2. Overall, this study elucidates the mechanism and novel insights regarding SOC accumulation under changes in litter input from the perspective of microbial CUE. These findings are critical for further comprehension of soil carbon dynamics and the terrestrial C-cycle.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Suelo / Microbiología del Suelo / Carbono País/Región como asunto: Asia Idioma: En Revista: Sci Total Environ Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Suelo / Microbiología del Suelo / Carbono País/Región como asunto: Asia Idioma: En Revista: Sci Total Environ Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos