Long-term irrigation reduces soil carbon sequestration by affecting soil microbial communities in agricultural ecosystems of northern China
Qi, Yongqing (Chinese Academy of Sciences. Institute of Genetics and Developmental Biology)
Li, Jian (Chinese Academy of Sciences. South China Botanical Garden)
Deng, Shaojun (Chinese Academy of Sciences. South China Botanical Garden)
Wang, Jun Wang (Chinese Academy of Sciences. South China Botanical Garden)
Zhang, Yanju (Chinese Academy of Sciences. South China Botanical Garden)
Pei, Hongwei (Chinese Academy of Sciences. Institute of Genetics and Developmental Biology)
Shen, Yanjun (Chinese Academy of Sciences. Institute of Genetics and Developmental Biology)
Hui, Dafeng (Tennessee State University. Department of Biological Sciences)
Lambers, Hans (University of Western Australia. School of Biological Sciences)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Liu, Zhanfeng (Chinese Academy of Sciences. South China Botanical Garden)

Data:	2022
Resum:	Irrigation has become one of the main approaches to improve agricultural production in an arid area. The variation of soil moisture after irrigation has the potential to affect soil microbial community composition and soil organic carbon (SOC) storage, and thus, the imbalances in the terrestrial ecosystem carbon cycle. However, the impact of long-term irrigation on the relationships between soil microbial community and SOC sequestration in semiarid agroecosystems is still poorly understood. We took advantage of a 7-year irrigation experiment in a winter wheat-maize rotation system in northern China, whereby the non-irrigation was subject to rain-fed conditions. We aimed to investigate the effects of long-term irrigation on soil microbial communities and their linkages with soil carbon sequestration. Seven years of irrigation significantly increased soil moisture content by 39% but decreased SOC concentration of topsoil (0-20 cm) by 4. 2% on average across all sampling times. The responses of soil microbial communities to irrigation were highly taxa dependent. Irrigation significantly decreased fungal biomass, fungal-to-bacterial ratio and Gram-positive-to-Gram-negative bacterial ratio, and did not affect the bacterial community biomass. The decreased SOC concentration under the long-term irrigation was mainly caused by the changes in the ratio of fungi-to-bacteria. Our findings highlight the important role of soil fungal-to-bacterial ratio in mediating the response of SOC dynamics to a future drier climate in semiarid agricultural ecosystems.
Ajuts:	European Commission 610028
Drets:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Fungi ; Gram-negative bacteria ; Gram-positive bacteria ; Semiarid agricultural systems ; Soil carbon ; Soil microbial community composition ; Soil moisture
Publicat a:	European journal of soil science, Vol. 73, issue 1 (January-February 2022) , art. e13143, ISSN 1365-2389

DOI: 10.1111/ejss.13143

Postprint 31 p, 1.1 MB

El registre apareix a les col·leccions:
Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals) > Imbalance-P
Articles > Articles de recerca
Articles > Articles publicats