Microbial growth responses upon rewetting soil dried for four days or one year
Microbial growth responses upon rewetting soil dried for four days or one year
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DOI：
10.1016/j.soilbio.2013.07.014
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发表时间：
2013-11-01
影响因子：
9.7
通讯作者：
Rousk, Johannes
中科院分区：
文献类型：
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作者：
Meisner, Annelein;Baath, Erland;Rousk, Johannes
呼吸脉冲是由干燥的土壤重新湿润引起的。在这里，我们研究的微生物的反应，这种呼吸脉冲时，再湿土壤干燥4天或1年。在4天的干燥土壤，呼吸增加到最大速率后立即复湿后，它呈指数下降。在1年干燥的土壤中，呼吸也立即增加，但随后保持在16 h的高水平，之后呼吸进一步增加，呈指数增长，20 h后达到峰值。细菌生长的水平最初是较低的再湿润比在不断潮湿的土壤，但开始线性增加后立即再湿润4天干燥的土壤。在1年的干燥土壤中，细菌生长开始后，只有16小时的零增长滞后期，然后以指数方式增加到30小时后的峰值，取代那些在持续潮湿的土壤中的速率。真菌生长开始增加后立即再润湿，并达到对照土壤的速率后2天的4天干燥的土壤，一个星期后的1年干燥的土壤。因此，长期干燥改变了细菌和真菌的生长模式后，再润湿。我们的研究结果表明，真菌和细菌的生长是解耦的初始呼吸脉冲和生长反应和微生物的C-利用效率可以受到长期干燥。(C)2013爱思唯尔有限公司保留所有权利。
A pulse of respiration is induced by rewetting dry soil. Here we study the microbial responses underlying this pulse of respiration when rewetting soil dried for 4-days or 1-year. In the 4-days dried soil, respiration increased to a maximum rate immediately upon rewetting after which it decreased exponentially. In the 1-year dried soil, respiration also increased immediately, but then remained high for 16 h, after which it increased further, exponentially, with a peak rate after 20 h. The level of bacterial growth was initially lower in rewetted than in constantly moist soil, but started to increase linearly immediately upon rewetting 4-days dried soil. In 1-year dried soil, bacterial growth started only after a 16 h lag period of zero growth, and then increased exponentially to a peak after 30 h, at rates superseding those in continually moist soil. Fungal growth started to increase immediately upon rewetting, and reached the rate of the control soil after 2 days for the 4-days dried soil, and after a week for the 1-year dried soil. Thus, prolonged drying altered the pattern of bacterial and fungal growth after rewetting. Our results suggest that both fungal and bacterial growth are uncoupled from the initial respiration pulse and that growth responses and microbial C-use efficiency can be affected by prolonged drying. (C) 2013 Elsevier Ltd. All rights reserved.