Microbial community composition explains soil respiration responses to changing carbon inputs along an Andes-to-Amazon elevation gradient.
Microbial community composition explains soil respiration responses to changing carbon inputs along an Andes-to-Amazon elevation gradient.
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微生物群落组成解释了土壤呼吸对沿安第斯山脉至亚马逊高度梯度沿线不断变化的碳输入的反应。
DOI：
10.1111/1365-2745.12247
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发表时间：
2014-07
期刊：
影响因子：
--
通讯作者：
Austin A
中科院分区：
文献类型：
--
作者：
Whitaker J;Ostle N;Nottingham AT;Ccahuana A;Salinas N;Bardgett RD;Meir P;McNamara NP;Austin A
1.预计安第斯山脉在本世纪将升温3-5 °C，有可能改变这些热带森林土壤中碳（C）循环的调节过程。预计这种快速变暖将刺激土壤微生物呼吸作用，改变植物物种分布，从而影响土壤中C输入的数量和质量，并影响释放到大气中的土壤来源的CO2的数量。2.我们研究了热带低地，山地和山地森林土壤取自沿着3200米的海拔梯度位于东南部安第斯秘鲁。我们确定了土壤微生物群落和非生物土壤特性如何随海拔而变化。然后，我们研究了微生物组成和土壤非生物特性的这些差异如何影响土壤碳循环过程，通过修改土壤与C基板不同的复杂性和测量土壤异养呼吸（RH）。3.研究结果表明，土壤生物和非生物特性随海拔高度的变化规律是一致的。微生物生物量和真菌相对于细菌的丰度随海拔升高而显著增加，微生物群落组成的这些差异与土壤C含量和C：N（氮）比密切相关。我们还发现，相对湿度增加添加碳基板的质量和数量，并与微生物生物量和真菌丰度呈正相关。4.统计建模显示，RH响应不断变化的C输入最好的预测土壤pH值和微生物群落组成，与丰富的真菌相对于细菌，和丰富的革兰氏阳性菌相对于革兰氏阴性菌解释了大部分的模型方差。5.合成.我们的研究结果表明，微生物功能群的相对丰度是一个重要的决定因素，RH响应改变C输入沿着广泛的热带海拔梯度在安第斯秘鲁。虽然我们不做气候变化对土壤的影响的实验测试，这些结果挑战的假设，不同的土壤微生物群落将是“功能等同”的气候变化的进展，他们强调需要更好的生态指标的土壤微生物群落，以帮助预测C循环的热带生物群落对气候变化的反应。
1. The Andes are predicted to warm by 3–5 °C this century with the potential to alter the processes regulating carbon (C) cycling in these tropical forest soils. This rapid warming is expected to stimulate soil microbial respiration and change plant species distributions, thereby affecting the quantity and quality of C inputs to the soil and influencing the quantity of soil-derived CO2 released to the atmosphere. 2. We studied tropical lowland, premontane and montane forest soils taken from along a 3200-m elevation gradient located in south-east Andean Peru. We determined how soil microbial communities and abiotic soil properties differed with elevation. We then examined how these differences in microbial composition and soil abiotic properties affected soil C-cycling processes, by amending soils with C substrates varying in complexity and measuring soil heterotrophic respiration (RH). 3. Our results show that there were consistent patterns of change in soil biotic and abiotic properties with elevation. Microbial biomass and the abundance of fungi relative to bacteria increased significantly with elevation, and these differences in microbial community composition were strongly correlated with greater soil C content and C:N (nitrogen) ratios. We also found that RH increased with added C substrate quality and quantity and was positively related to microbial biomass and fungal abundance. 4. Statistical modelling revealed that RH responses to changing C inputs were best predicted by soil pH and microbial community composition, with the abundance of fungi relative to bacteria, and abundance of gram-positive relative to gram-negative bacteria explaining much of the model variance. 5. Synthesis. Our results show that the relative abundance of microbial functional groups is an important determinant of RH responses to changing C inputs along an extensive tropical elevation gradient in Andean Peru. Although we do not make an experimental test of the effects of climate change on soil, these results challenge the assumption that different soil microbial communities will be ‘functionally equivalent’ as climate change progresses, and they emphasize the need for better ecological metrics of soil microbial communities to help predict C cycle responses to climate change in tropical biomes.
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影响因子：
4.2
作者：
Bouillon, S;Moens, T;Dehairs, F
通讯作者：
Dehairs, F
影响因子：
4.4
作者：
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作者：
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