Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2025541 | Soil Biology and Biochemistry | 2007 | 10 Pages |
Abstract
Microbial biomass, indices of microbial activity and the activities of the hydrolases negatively correlated with Mg2+/Ca2+ or exchangeable Mg2+ percentage. Biomass C, biomass N, microbial quotient (the percentage of soil organic C present as biomass C), biomass N as a percentage of total N, potentially mineralizable N, FDA hydrolysis rate and arginine ammonification rate decreased exponentially with increasing EC. The biomass C/N tended to be lower in soils with higher salinity and Mg2+ alkalinity, probably reflecting the bacterial dominance in microbial biomass in alkalized magnesic soils. The metabolic quotient (qCO2) positively correlated with salinity and Mg2+ alkalinity, and showed a quadratic relationship with EC, indicating that increasing salinity and Mg2+ alkalinity resulted in a progressively smaller, more stressed microbial communities which was less metabolically efficient. Consequently, our data suggest that salinity and Mg2+ alkalinity are stressful environments for soil microorganisms.
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Authors
Bing-Cheng Yuan, Xue-Gong Xu, Zi-Zhen Li, Tian-Peng Gao, Meng Gao, Xian-Wei Fan, Jian-Ming Deng,