Fecha/hora: 15/06/2024 22:00:35

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	18/12/2017	
Fecha de la última actualización: 	18/12/2017	
Autoria: 	LÓPEZ-AIZPÚN, M.; ARANGO-MORA, C.; SANTAMARÍA, C.; LASHERAS, E.; SANTAMARÍA, J.M.; CIGANDA, V.; CÁRDENAS, L.M.; ELUSTONDO, D.	
Afiliación: 	M. LÓPEZ-AIZPÚN, UNAV (Universidad de Navarra); C. ARANGO-MORA, UNAV (Universidad de Navarra); C. SANTAMARÍA, UNAV (Universidad de Navarra); E. LASHERAS, UNAV (Universidad de Navarra); J.M. SANTAMARÍA, UNAV (Universidad de Navarra); VERONICA SOLANGE CIGANDA BRASCA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; L.M. CÁRDENAS, Rothamsted Research, United Kindom; D. ELUSTONDO, UNAV (Universidad de Navarra).	
Título: 	Atmospheric ammonia concentration modulates soil enzyme and microbial activity in an oak forest affecting soil microbial biomass.	
Año de publicación: 	2017	
Fuente/Imprenta: 	Soil Biology and Biochemistry, 2017, v.116, p.378-387.	
DOI: 	10.1016/j.soilbio.2017.10.020	
Idioma: 	Inglés	
Notas: 	Article history: Received 19 June 2017; Received in revised form 20 October 2017; Accepted 21 October 2017; Available online 07 November 2017.
The research leading to these results has received funding from "la Caixa" Banking Foundation . The authors express their gratitude to the analytical staff of the Department of Chemistry and the Department of Environmental Biology of the University of Navarra for its assistance, J.M. Otano, J.J Irigoyen and I. Pascual, in particular. Rothamsted Research is sponsored by the BBSRC .	
Contenido: 	ABSTRACT.
The present work was carried out to assess the effect of atmospheric ammonia (NH3) on soil physicochemical properties, soil enzymatic activities (&#946;-glucosidase -&#946;-GLU-, nitrate reductase ?NR-, urease ?UR-, protease ?PRO-, acid phosphatase ?PHO-, dehydrogenase ?DHA-), soil microbial biomass and soil respiration. The study was conducted along a NH3 gradient in a Q. pubescens Milld. forest in the vicinity of two livestock farms. Because of NHy (NHy: NH3 and NH4+) deposition, N saturation was detected up to 330 m from the farms. This excess of N led to a decrease in soil C:N and an increase in soil nitrification processes, which resulted in an accumulation of the heavy N isotope (15N) in the soil. N saturation was also reflected in the activity of NR enzyme, which was inhibited. On the other hand, while UR enzyme was inhibited close to the farms possibly due to the high amount of N-NH4+ resulting from the hydrolysis of NH3, PRO activity was stimulated by the presence of organic nitrogen compounds and the need of soil organisms to meet the C demand. In addition, the activity of PHO and &#946;-GLU enzymes was regulated by the relative amount of C and P that organisms need. Regarding biological variables, enhanced NH3 reduced soil microbial biomass and biomass respiratory efficiency. Finally, soil enzyme activities and soil microbial biomass have proved to be good biological indicators of soil quality. 

© 2017 Elsevier Ltd	
Palabras-Clave: 	ATMOSPHERIC AMMONIA; METABOLIC QUOTIENT; SOIL EXTRACELLULAR ENZYMES; SOIL MICROBIAL BIOMASS; SOIL RESPIRATION.	
Categoría del tema: 	--	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (101520-1) - PXI - AP - DD - PP/SOIL BIOLOGY & BIOCHEMISTRY/2017 -  -  - DIS