Dynamics of 14C-labeled glucose and ammonium in saline arable soils

Revista Brasileira de Ciência do Solo

Alma Vuelvas-solórzano²  Rosalina Hernández-matehuala²  Eloy Conde-barajas¹  Marco L. Luna-guido¹  Luc Dendooven¹  Marcela Cárdenas-manríquez¹ 

[1] ,Instituto Tecnológico de Celaya Departamento de Ing. Bioquímica Celaya Gto. México

关键词: dynamics of inorganic N;    emission of 14CO2 and 12CO2;    saline soils;    dinâmica de nitrogênio inorgânico;    emissão de 12CO2 e 14CO2;    solos salinos;   

DOI  :  10.1590/S0100-06832009000400010

来源: SciELO

【 摘 要 】

Organic matter dynamics and nutrient availability in saline agricultural soils of the State of Guanajuato might provide information for remediation strategies. 14C labeled glucose with or without 200 mg kg-1 of NH4+-N soil was added to two clayey agricultural soils with different electrolytic conductivity (EC), i.e. 0.94 dS m-1 (low EC; LEC) and 6.72 dS m-1 (high EC; HEC), to investigate the effect of N availability and salt content on organic material decomposition. Inorganic N dynamics and production of CO2 and 14CO2 were monitored. Approximately 60 % of the glucose-14C added to LEC soil evolved as 14CO2, but only 20 % in HEC soil after the incubation period of 21 days. After one day, < 200 mg 14C was extractable from LEC soil, but > 500 mg 14C from HEC soil. No N mineralization occurred in the LEC and HEC soils and glucose addition reduced the concentrations of inorganic N in unamended soil and soil amended with NH4+-N. The NO2- and NO3- concentrations were on average higher in LEC than in HEC soil, with exception of NO2- in HEC amended with NH4+-N. It was concluded that increases in soil EC reduced mineralization of the easily decomposable C substrate and resulted in N-depleted soil.

【 授权许可】

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