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Autotrophic and Heterotrophic Nitri?cation in a Highly Acidic Subtropical Pine Forest Soil

Pedosphere 2016年第6期26卷 904-910页

作者： faeflen j.sarwee LI Shiwei XIN Xiaoping Alan L.WRIGHT jIANG Xianjun College of Resources and Environment Southwest UniversityChongqing 400715(China) Everglades Research&Education Center University of FloridaBelle Glade FL 33430(USA)

The occurrence of nitri?cation in some acidic forest soils is still a subject of ***?cation of main nitri?cation pathways in acidic forest soils is still largely *** yellow soil(Oxisol) samples were selected to test whether nitri?cation can occur or not in acidic subtropical pine forest *** contributions of autotrophs and heterotrophs to nitri?cation were studied by adding selective nitri?cation inhibitor *** NH^+_4-N concentrations decreased,but NO^-_3-N concentrations increased signi?cantly for the no-nitrapyrin control during the ?rst week of incubation,indicating that nitri?cation did occur in the acidic subtropical *** calculated net nitri?cation rate was 0.49 mg N kg^(-1)d^(-1)for the no-nitrapyrin control during the ?rst week of *** amendment resulted in a signi?cant reduction of NO^-_3-N *** nitri?cation rate averaged0.28 mg N kg^(-1)d^(-1)and the heterotrophic nitri?cation rate was 0.21 mg N kg^(-1)d^(-1)in the ?rst ***-oxidizing bacteria(AOB) abundance increased slightly during incubation,but nitrapyrin amendment signi?cantly decreased AOB amo A gene copy numbers by about 80%.However,the ammonia-oxidizing archaea(AOA) abundance showed signi?cant increases only in the last 2weeks of incubation and it was also decreased by nitrapyrin *** results indicated that nitri?cation did occur in the present acidic subtropical pine forest soil,and autotrophic nitri?cation was the main nitri?cation *** AOA and AOB were the active biotic agents responsible for autotrophic nitri?cation in the acidic subtropical pine forest soil.

关键词： acidic yellow soil ammonia-oxidizing archaea ammonia-oxidizing bacteria net nitrification rate nitrapyrin nitrification inhibitor

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Redox-driven shifts in soil microbial community structure in the drawdown zone after construction of the Three Gorges Dam

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Soil Ecology Letters 2019年第3期1卷 114-125页

作者： Shuling Wang sarwee j.faeflen Alan L.Wright Xia Zhu-Barker Xianjun jiang College of Resources and Environment Southwest UniversityChongqing 400715China Indian River Research&Education Center University of FloridaFort PierceFL 34945USA Department of Land Air and Water ResourcesUniversity of California DavisCA 95616USA

Soil redox is a critical environmental factor shaping the microbial community structure and ultimately alters the nutrient ***,the response of soil microbial community structure to prolonged or repeated redox fluctuations is not yet *** study the dynamic effects of prolonged redox disturbances to the soil microbial community structure,soil samples experiencing 8,5 and 0 alternating oxic-anoxic cycles within approximately 6 months each year were collected and the microbial community structure were evaluated using phospholipid fatty acid analysis(PLFA)*** redox disturbances had significant effects on soil physiochemical properties and soil microbial community *** relative abundance of straight chain saturated PLFAs,cyclopropyl,and terminal-and mid-branched chain saturated PLFAs increased due to prolonged redox disturbances,but there was a consistent decrease in linear monounsaturated PLFAs and polyunsaturated PLFAs in the fluctuating *** redox disturbances had a negative impact on the total PLFA content(a proxy for biomass).Both the fluctuating zone(8-cycle and 5-cycle plots)and the never flooded zone(0-cycle plots)were dominated by Gram-positive bacteria and a low content of fungi,actinomycetes and *** fungi and protozoa abundance decreased significantly with an increase in the occurrence of alternating flooding-dry events,suggesting that the prolonged redox disturbance leads to high stress on the fungi and protozoa ***,total organic matter(TOC)and C:N ratio,environmental factors that can be influenced by recurring redox fluctuations,also influenced the microbial community structure.

关键词： Water fluctuation zone Redox disturbance Microbial community structure Phospholipid fatty acids(PLFA) Three Gorges Reservoir

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