Global pattern and controls of soil microbial metabolic quotient
Xu, Xiaofeng (San Diego State University. Biology Department)
Schimel, Joshua P. (University of California, Santa Barbara. Department of Ecology, Evolutionary, and Marine Biology)
Janssens, Ivan (University of Antwerp (Bèlgica))
Song, Xia (San Diego State University. Biology Department)
Song, Changchun (Zhongguo ke xue yuan. Northeast Institute of Geography and Agroecology)
Yu, Guirui (Zhongguo ke xue yuan.. Institute of Geology and Natural Resources Research)
Sinsabaugh, Robert L. (University of New Mexico. Department of Biology)
Tang, Diandong (Beijing shi fan da xue. Department of Chemistry)
Zhang, Xiaochun (San Diego State University. Biology Department)
Thorn, Peter. E. (Oak Ridge National Laboratory. Climate Change Science Institute and Environmental Sciences Division)

Fecha:	2017
Resumen:	imbalance.
Resumen:	The microbial metabolic quotient (MMQ), microbial respiration per unit of biomass, is a fundamental factor controlling heterotrophic respiration, the largest carbon flux in soils. The magnitude and controls of MMQ at regional scale remain uncertain. We compiled a comprehensive data set of MMQ to investigate the global patterns and controls of MMQ in top 30 cm soils. Published MMQ values, generally measured in laboratory microcosms, were adjusted on ambient soil temperature using long-term (30 yr) average site soil temperature and a Q₁₀ = 2. The area-weighted global average of MMQ_Soil is estimated as 1. 8 (1. 5-2. 2) (95% confidence interval) μmol C·h⁻¹·mmol⁻¹ microbial biomass carbon (MBC) with substantial variations across biomes and between cropland and natural ecosystems. Variation was most closely associated with biological factors, followed by edaphic and meteorological parameters. MMQ_Soil was greatest in sandy clay and sandy clay loam and showed a pH maximum of 6. 7 ± 0. 1 (mean ± se). At large scale, MMQ_Soil varied with latitude and mean annual temperature (MAT), and was negatively correlated with microbial N:P ratio, supporting growth rate theory. These trends led to large differences in MMQ_Soil between natural ecosystems and cropland. When MMQ was adjusted to 11°C (MMQ_Ref), the global MAT in the top 30 cm of soils, the area-weighted global averages of MMQ_Ref was 1. 5 (1. 3-1. 8) μmol C·mmol MBC⁻¹·h⁻¹. The values, trends, and controls of MMQ_Soil add to our understanding of soil microbial influences on soil carbon cycling and could be used to represent microbial activity in global carbon models.
Ayudas:	European Commission 610028
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió acceptada per publicar
Materia:	Basal respiration ; Edaphic factor ; Meteorology ; Microbial metabolic quotient ; PH ; Soil micro-bial biomass
Publicado en:	Ecological monographs, Vol. 87, issue 3 (Aug. 2017) , p. 429-441, ISSN 1557-7015

DOI: 10.1002/ecm.1258

Post-print 39 p, 831.4 KB

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Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals) > Imbalance-P
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