2017
DOI: 10.5194/bg-14-4815-2017
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Contrasting effects of ammonium and nitrate additions on the biomass of soil microbial communities and enzyme activities in subtropical China

Abstract: Abstract. The nitrate to ammonium ratios in nitrogen (N) compounds in wet atmospheric deposits have increased over the recent past, which is a cause for some concern as the individual effects of nitrate and ammonium deposition on the biomass of different soil microbial communities and enzyme activities are still poorly defined. We established a field experiment and applied ammonium (NH 4 Cl) and nitrate (NaNO 3 ) at monthly intervals over a period of 4 years. We collected soil samples from the ammonium and nit… Show more

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Cited by 38 publications
(30 citation statements)
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“…Furthermore, accelerated nitrification is the decisive cause of soil acidification under N enrichment, because the oxidation of NH 4 + or NH 3 to NO 3 − produces much H + (Lu, Mao, Gilliam, Luo, & Mo, ). Similar results of NO 3 − accumulation and acidification in the subtropical forest soils were reported by other researchers (Zhang et al., ; Zhao, Zhang, Müller, & Cai, ). Another alternative explanation is the increase in base cation (e.g., Ca 2+ , Mg 2+ ) leaching due to NO 3 − loss, which reduces soil acid neutralizing capacity (Lu et al., ).…”
Section: Discussionsupporting
confidence: 90%
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“…Furthermore, accelerated nitrification is the decisive cause of soil acidification under N enrichment, because the oxidation of NH 4 + or NH 3 to NO 3 − produces much H + (Lu, Mao, Gilliam, Luo, & Mo, ). Similar results of NO 3 − accumulation and acidification in the subtropical forest soils were reported by other researchers (Zhang et al., ; Zhao, Zhang, Müller, & Cai, ). Another alternative explanation is the increase in base cation (e.g., Ca 2+ , Mg 2+ ) leaching due to NO 3 − loss, which reduces soil acid neutralizing capacity (Lu et al., ).…”
Section: Discussionsupporting
confidence: 90%
“…At the same site, Zhang et al. () reported that low levels of NH 4 Cl and NaNO 3 fertilization (40 kg N ha −1 yr −1 ) accelerated soil NO 3 − accumulation and soil acidification, which, in turn, inhibited the enzyme activity of C hydrolysis (e.g., α‐1–4‐glucosidase and β‐1–4‐glucosidase). This suggests a slower decomposition of carbohydrates (DeForest, Zak, Pregitzer, & Burton, ).…”
Section: Discussionmentioning
confidence: 99%
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“…On the one hand, previous studies demonstrated the selective stabilization of O-alkyl C such as carbohydrates could defend against microbial attack through interactions with pedogenic oxides under mineral N application [78]. On the other hand, the glycanolytic activity (e.g., α-1-4-glucosidase and β-1-4-glucosidase) associated with degradation of polysaccharide was inhibited under N enrichment in our study site [79], thus leading to an accumulation of carbohydrates. Naafs et al [80] also pointed out that the polysaccharides was accumulated due to reduced bacterial activity.…”
Section: Effects Of N Addition On Chemical Compositions In Three Partmentioning
confidence: 62%
“…The mechanism for this phenomenon is not clear, but one probable explanation is that some other nutrient elements (i.e., C and P) from litter become limited factors when N was satisfied [51]. Furthermore, Zhang, et al [52] reported that carbon hydrolysis and polyphenol oxidase activities were positively correlated with (NH 4 -N), which was only influenced by litter treatments. Thus, litter may play an important role in this experiment.…”
Section: Soil Respiration In Response To Incremental N Gradientsmentioning
confidence: 99%