Do soil bacterial communities respond differently to abrupt or gradual additions of copper?
Do soil bacterial communities respond differently to abrupt or gradual additions of copper?
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DOI：
10.1093/femsec/fiy212
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发表时间：
2019-01-01
影响因子：
4.2
通讯作者：
Ramsey PW
中科院分区：
文献类型：
--
作者：
McTee M;Bullington L;Rillig MC;Ramsey PW
许多测量微生物群落对重金属反应的实验都会突然增加土壤中的金属浓度。然而，目前尚不清楚突然添加是否模仿了这些金属在微生物种群可能适应的环境中逐渐且通常长期积累的过程。在一项持续 26 个月的温室实验中，我们测试了突然或逐渐添加铜或根本不添加铜的土壤之间的细菌群落和土壤呼吸是否存在差异。与不接受铜的环境处理相比，突然处理的细菌丰富度和其他多样性指数始终较低。突然添加铜产生的初始细菌群落与逐渐添加不同，但是一旦铜浓度大致相等，这些群落似乎会收敛。突然处理时土壤呼吸最初受到抑制，但四个月后恢复。此后，渐进治疗和突然治疗中的呼吸在低于或等于环境治疗中波动。总的来说，我们的研究表明，逐渐和突然添加铜可以产生相似的细菌群落和呼吸作用，但这些反应可能会发生巨大变化，直到铜浓度相等。
Many experiments that measure the response of microbial communities to heavy metals increase metal concentrations abruptly in the soil. However, it is unclear whether abrupt additions mimic the gradual and often long-term accumulation of these metals in the environment where microbial populations may adapt. In a greenhouse experiment that lasted 26 months, we tested whether bacterial communities and soil respiration differed between soils that received an abrupt or a gradual addition of copper or no copper at all. Bacterial richness and other diversity indices were consistently lower in the abrupt treatment compared to the ambient treatment that received no copper. The abrupt addition of copper yielded different initial bacterial communities than the gradual addition, however these communities appeared to converge once copper concentrations were approximately equal. Soil respiration in the abrupt treatment was initially suppressed but recovered after four months. Afterwards, respiration in both the gradual and abrupt treatments wavered between being below or equal to the ambient treatment. Overall, our study indicates that gradual and abrupt additions of copper can yield similar bacterial communities and respiration, but these responses may drastically vary until copper concentrations are equal.
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影响因子：
6.4
作者：
Gibbons SM;Lekberg Y;Mummey DL;Sangwan N;Ramsey PW;Gilbert JA
通讯作者：
Gilbert JA
影响因子：
48
作者：
Callahan BJ;McMurdie PJ;Rosen MJ;Han AW;Johnson AJ;Holmes SP
通讯作者：
Holmes SP
影响因子：
2.8
作者：
Gadd, Geoffrey Michael
通讯作者：
Gadd, Geoffrey Michael
影响因子：
4.9
作者：
Bullington, Lorinda S.;Lekberg, Ylva;Larkin, Beau
通讯作者：
Larkin, Beau
影响因子：
9.7
作者：
FLIESSBACH, A;MARTENS, R;REBER, HH
通讯作者：
REBER, HH