Response of microbial activity and biomass to soil salinity when supplied with glucose and cellulose

Two incubation experiments were carried out to determine the impact of salinity on microbial activity and biomass when organic carbon is supplied as different proportions of glucose and cellulose or when glucose and cellulose were added every 2 weeks in different order. The first experiment was cond...

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Autores principales:	Elmajdoub,B, Marschner,P
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2015
Materias:	Cellulose glucose microbial biomass respiration salinity
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162015000400001
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spelling	oai:scielo:S0718-951620150004000012016-01-14Response of microbial activity and biomass to soil salinity when supplied with glucose and celluloseElmajdoub,BMarschner,P Cellulose glucose microbial biomass respiration salinity Two incubation experiments were carried out to determine the impact of salinity on microbial activity and biomass when organic carbon is supplied as different proportions of glucose and cellulose or when glucose and cellulose were added every 2 weeks in different order. The first experiment was conducted with a non-saline soil and two saline soils (ECe 11 and 43 dS m-1) amended with 5 g C kg-1 as different percentages of glucose and cellulose: glucose: 100% and 0-20% and cellulose: 0-100%. In the second experiment a non-saline loamy sand soil was used which was salinized to ECe 12.5 and 37.4 dS m-1. The C form was maintained or changed over time by addition of 1.5 g C kg-1 every two weeks as glucose or cellulose. In Experiment 1, mixing glucose with cellulose increased cumulative respiration compared to cellulose alone. Cumulative respiration increased with increasing proportion of glucose in the combined treatments with glucose >2.5%.With 100% glucose, cumulative respiration was significantly lower than in the non-saline soil only in EC43. But with 100% cellulose and all combined treatments, cumulative respiration was significantly lower than in the non-saline soil in EC11 and EC43. Cumulative respiration did not differ between EC11 and EC43 with 100% cellulose but decreased significantly in the mixed treatments except with 10% glucose. In Experiment 2, cumulative respiration in the first period (0-14) was always higher with glucose than with cellulose; it decreased with increasing EC. The impact of salinity was smaller when C was added repeatedly compared to a single addition. Cumulative respiration increased when glucose was added after cellulose addition. In conclusion, mixing small amounts of glucose with cellulose could make microbes more sensitive to salinity compared to 100% cellulose. Further, maintaining high C availability with repeated C addition reduces the negative impact of salinity on soil microbes.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.15 n.4 20152015-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162015000400001en10.4067/S0718-95162015005000056
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Cellulose glucose microbial biomass respiration salinity
spellingShingle	Cellulose glucose microbial biomass respiration salinity Elmajdoub,B Marschner,P Response of microbial activity and biomass to soil salinity when supplied with glucose and cellulose
description	Two incubation experiments were carried out to determine the impact of salinity on microbial activity and biomass when organic carbon is supplied as different proportions of glucose and cellulose or when glucose and cellulose were added every 2 weeks in different order. The first experiment was conducted with a non-saline soil and two saline soils (ECe 11 and 43 dS m-1) amended with 5 g C kg-1 as different percentages of glucose and cellulose: glucose: 100% and 0-20% and cellulose: 0-100%. In the second experiment a non-saline loamy sand soil was used which was salinized to ECe 12.5 and 37.4 dS m-1. The C form was maintained or changed over time by addition of 1.5 g C kg-1 every two weeks as glucose or cellulose. In Experiment 1, mixing glucose with cellulose increased cumulative respiration compared to cellulose alone. Cumulative respiration increased with increasing proportion of glucose in the combined treatments with glucose >2.5%.With 100% glucose, cumulative respiration was significantly lower than in the non-saline soil only in EC43. But with 100% cellulose and all combined treatments, cumulative respiration was significantly lower than in the non-saline soil in EC11 and EC43. Cumulative respiration did not differ between EC11 and EC43 with 100% cellulose but decreased significantly in the mixed treatments except with 10% glucose. In Experiment 2, cumulative respiration in the first period (0-14) was always higher with glucose than with cellulose; it decreased with increasing EC. The impact of salinity was smaller when C was added repeatedly compared to a single addition. Cumulative respiration increased when glucose was added after cellulose addition. In conclusion, mixing small amounts of glucose with cellulose could make microbes more sensitive to salinity compared to 100% cellulose. Further, maintaining high C availability with repeated C addition reduces the negative impact of salinity on soil microbes.
author	Elmajdoub,B Marschner,P
author_facet	Elmajdoub,B Marschner,P
author_sort	Elmajdoub,B
title	Response of microbial activity and biomass to soil salinity when supplied with glucose and cellulose
title_short	Response of microbial activity and biomass to soil salinity when supplied with glucose and cellulose
title_full	Response of microbial activity and biomass to soil salinity when supplied with glucose and cellulose
title_fullStr	Response of microbial activity and biomass to soil salinity when supplied with glucose and cellulose
title_full_unstemmed	Response of microbial activity and biomass to soil salinity when supplied with glucose and cellulose
title_sort	response of microbial activity and biomass to soil salinity when supplied with glucose and cellulose
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2015
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162015000400001
work_keys_str_mv	AT elmajdoubb responseofmicrobialactivityandbiomasstosoilsalinitywhensuppliedwithglucoseandcellulose AT marschnerp responseofmicrobialactivityandbiomasstosoilsalinitywhensuppliedwithglucoseandcellulose
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Response of microbial activity and biomass to soil salinity when supplied with glucose and cellulose

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