Pre-exposure to drought increases the resistance of tropical forest soil bacterial communities to extended drought
Pre-exposure to drought increases the resistance of tropical forest soil bacterial communities to extended drought
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DOI：
10.1038/ismej.2012.113
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发表时间：
2013-02-01
期刊：
影响因子：
11
通讯作者：
Brodie, Eoin L.
中科院分区：
文献类型：
--
作者：
Bouskill, Nicholas J.;Lim, Hsiao Chien;Brodie, Eoin L.
全球气候模型预测热带地区的降水量会减少。降雨模式的变化对热带土壤的含水量和氧化还原状态有重要影响，但人们对这些变化如何影响微生物群落结构知之甚少。具体来说，暴露于先前的压力赋予增加抵抗随后的扰动？在这里，我们减少了降水穿透量的热带森林土壤中的卢基略山脉，波多黎各。处理包括新建立的穿透雨排除图（从头排除），第二次减少的图（预先排除）和环境控制图。10个月的穿透雨排除导致一个小的，但统计上显着的下降，土壤水势和细菌种群明显适应增加渗透胁迫。虽然水势下降很小，微生物生物量没有变化，系统发育多样性在新排除的地块相比，控制地块减少了约40%，但预排除的地块没有显着变化。另一方面，与对照地块相比，在新排除和预排除地块中细菌类群的相对丰度随着穿透雨排除而显著变化。细菌群落结构的变化可以解释土壤孔隙水化学的变化，并建议在土壤氧化还原的变化。可溶性铁下降的治疗地块，并与可溶性磷浓度降低，这可能有显着的影响，在这些P-有限的系统中的微生物生产力。The ISME Journal（2013）7，384-394; doi：10.1038/ismej.2012.113; 2012年11月15日在线发表
Global climate models project a decrease in the magnitude of precipitation in tropical regions. Changes in rainfall patterns have important implications for the moisture content and redox status of tropical soils, yet little is known about how these changes may affect microbial community structure. Specifically, does exposure to prior stress confer increased resistance to subsequent perturbation? Here we reduced the quantity of precipitation throughfall to tropical forest soils in the Luquillo Mountains, Puerto Rico. Treatments included newly established throughfall exclusion plots (de novo excluded), plots undergoing reduction for a second time (pre-excluded) and ambient control plots. Ten months of throughfall exclusion led to a small but statistically significant decline in soil water potential and bacterial populations clearly adapted to increased osmotic stress. Although the water potential decline was small and microbial biomass did not change, phylogenetic diversity in the de novo-excluded plots decreased by similar to 40% compared with the control plots, yet pre-excluded plots showed no significant change. On the other hand, the relative abundances of bacterial taxa in both the de novo-excluded and pre-excluded plots changed significantly with throughfall exclusion compared with control plots. Changes in bacterial community structure could be explained by changes in soil pore water chemistry and suggested changes in soil redox. Soluble iron declined in treatment plots and was correlated with decreased soluble phosphorus concentrations, which may have significant implications for microbial productivity in these P-limited systems. The ISME Journal (2013) 7, 384-394; doi:10.1038/ismej.2012.113; published online 15 November 2012