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Microbial use of N-15-labelled maize residues affected by winter temperature scenarios

机译：受冬季温度影响的N-15标记玉米残留的微生物利用

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A 56-day incubation experiment was carried out to investigate decomposition and microbial use of N-15-labelled maize (Zea mays L.) residues incubated under four winter temperature scenarios. The residues were mixed to mesocosms equivalent to 1.2 mg C and 42.5 mu g N g(-1) dry soil, after which the samples were incubated at a constant temperature of +4 degrees C, a constant -3 degrees C, and under multiple and single freeze thaw conditions. A constant +4 degrees C was most favourable for microbial substrate use, with 4- and 6-fold higher total and maize-C mineralization, respectively, in comparison with constant frost. The cumulative maize mineralization was not determined by the frequency of freeze thaw events, but regulated by the overall time of frost and thaw conditions. The decomposition of maize straw significantly increased soil organic C mineralization (in all scenarios) and incorporation into microbial biomass (in the freeze thaw scenarios only). The positive priming effects observed were equivalent to an additional loss of total soil organic C of between about 0.2 (continuous frost) and 0.8% (single freeze thaw). Microbial biomass was significantly increased after maize straw amendment, with constant frost and freeze thaw scenarios not having any negative effect on microbial biomass C compared with constant +4 degrees C. Highest fungal biomass was found after constant frost without fresh substrates and also after extended frost followed by a warm period when fresh plant residues were present. On average, 50% of the added maize N were recovered in the soil total N after 56 days of constant 4 degrees C and in the freeze thaw scenarios, with the strongest effect after single freezing and thawing.
机译：进行了56天的温育实验，以研究在四种冬季温度情况下温育的N-15标记玉米（Zea mays L.）残留物的分解和微生物利用。将残留物混合至相当于1.2 mg C和42.5μg N g（-1）干燥土壤的中膜，然后将样品在+4摄氏度，-3摄氏度的恒定温度和多个和单冻融条件。恒定+4摄氏度最适合微生物基质的使用，与恒定霜冻相比，总和玉米C的矿化分别高4到6倍。玉米的累积矿化不是由冻融事件的频率决定的，而是由霜冻和融化条件的总时间决定的。玉米秸秆的分解显着增加了土壤有机碳的矿化作用（在所有情况下）并掺入了微生物生物量（仅在冻融情况下）。观察到的良好的引发作用相当于使土壤有机碳总量损失了约0.2（连续霜冻）至0.8％（单次冻融）。玉米秸秆改良后微生物量显着增加，与恒定+4摄氏度相比，恒定的霜冻和冻融情景对微生物量C没有任何负面影响。恒定的霜冻后没有新鲜的底物以及霜冻延长后，真菌生物量最高随后是温暖的时期，此时存在新鲜的植物残渣。平均而言，在恒定的4摄氏度下56天后和在冻融情况下，总氮中50％的玉米N被回收到土壤中，在单次冻融后效果最强。

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