Soil enzymes and biological activity at different levels of organic matter stability

Soil biological activity has important implications for soil carbon (C) sequestration. However, very little is known about the environmental factors, particularly the effect of soil mineralogy on availability of C for soil microorganisms. In this study, we have investigated the influences of soil ty...

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Autores principales:	Merino,C, Godoy,R, Matus,F
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2016
Materias:	Soil fraction carbon mineralization volcanic soils mineral interaction
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000100002
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spelling	oai:scielo:S0718-951620160001000022016-05-05Soil enzymes and biological activity at different levels of organic matter stabilityMerino,CGodoy,RMatus,F Soil fraction carbon mineralization volcanic soils mineral interaction Soil biological activity has important implications for soil carbon (C) sequestration. However, very little is known about the environmental factors, particularly the effect of soil mineralogy on availability of C for soil microorganisms. In this study, we have investigated the influences of soil type (clay mineralogy)on C mineralization and its effects on biological activity at different levels of soil organic matter stability. Two soils an allophanic, derived from recent volcanic ash and a kaolinitic, resulting from metamorphic parent materials were physically fractioned in to light(LF, coarse sand 250-2000 µm), intermediate (IF, fine sand53-250 µm) and mineral (MF,silt and clay < 53 µm) fractions. Several biological and biochemical analyses at Ah horizons of mineral soil and physical fractions were conducted: soil respiration, enzymatic activities, carbohydratesand microbial biomass, amongst others soil variables. The results indicated that the bulk soiland physical fractions had a significant impact on cumulative C mineralizedafter 30 days of incubation and soil enzyme activities. More than 76% of total C-CO2 variation was explained by stepwise multiple regression analysis including factors such as soil enzymes (ß-glucosidase, dehydrogenase and phosphatase) and inorganic P. Soil ATP extractionwas agood indicator of microbial activity, because of a positive and significant correlation among ATP and i) C-CO2 and ii) metabolic quotient (soil respiration rate divided by microbial biomass). We also found an inverse and significant relationship between Al pyrophosphate (Al bound to SOM) and the C-CO2 in volcanic soil, whereas the same correlation did not occur in kaolinitic soil. Our results confirmed a greater stabilization capacityof MF in allophanicthan in kaolinitic soils due to the amorphous minerals clay materials.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.16 n.1 20162016-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000100002en10.4067/S0718-95162016005000002
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Soil fraction carbon mineralization volcanic soils mineral interaction
spellingShingle	Soil fraction carbon mineralization volcanic soils mineral interaction Merino,C Godoy,R Matus,F Soil enzymes and biological activity at different levels of organic matter stability
description	Soil biological activity has important implications for soil carbon (C) sequestration. However, very little is known about the environmental factors, particularly the effect of soil mineralogy on availability of C for soil microorganisms. In this study, we have investigated the influences of soil type (clay mineralogy)on C mineralization and its effects on biological activity at different levels of soil organic matter stability. Two soils an allophanic, derived from recent volcanic ash and a kaolinitic, resulting from metamorphic parent materials were physically fractioned in to light(LF, coarse sand 250-2000 µm), intermediate (IF, fine sand53-250 µm) and mineral (MF,silt and clay < 53 µm) fractions. Several biological and biochemical analyses at Ah horizons of mineral soil and physical fractions were conducted: soil respiration, enzymatic activities, carbohydratesand microbial biomass, amongst others soil variables. The results indicated that the bulk soiland physical fractions had a significant impact on cumulative C mineralizedafter 30 days of incubation and soil enzyme activities. More than 76% of total C-CO2 variation was explained by stepwise multiple regression analysis including factors such as soil enzymes (ß-glucosidase, dehydrogenase and phosphatase) and inorganic P. Soil ATP extractionwas agood indicator of microbial activity, because of a positive and significant correlation among ATP and i) C-CO2 and ii) metabolic quotient (soil respiration rate divided by microbial biomass). We also found an inverse and significant relationship between Al pyrophosphate (Al bound to SOM) and the C-CO2 in volcanic soil, whereas the same correlation did not occur in kaolinitic soil. Our results confirmed a greater stabilization capacityof MF in allophanicthan in kaolinitic soils due to the amorphous minerals clay materials.
author	Merino,C Godoy,R Matus,F
author_facet	Merino,C Godoy,R Matus,F
author_sort	Merino,C
title	Soil enzymes and biological activity at different levels of organic matter stability
title_short	Soil enzymes and biological activity at different levels of organic matter stability
title_full	Soil enzymes and biological activity at different levels of organic matter stability
title_fullStr	Soil enzymes and biological activity at different levels of organic matter stability
title_full_unstemmed	Soil enzymes and biological activity at different levels of organic matter stability
title_sort	soil enzymes and biological activity at different levels of organic matter stability
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000100002
work_keys_str_mv	AT merinoc soilenzymesandbiologicalactivityatdifferentlevelsoforganicmatterstability AT godoyr soilenzymesandbiologicalactivityatdifferentlevelsoforganicmatterstability AT matusf soilenzymesandbiologicalactivityatdifferentlevelsoforganicmatterstability
_version_	1714206524548579328

Soil enzymes and biological activity at different levels of organic matter stability

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