Vertical distribution of bacterial community is associated with the degree of soil organic matter decomposition in the active layer of moist acidic tundra
Vertical distribution of bacterial community is associated with the degree of soil organic matter decomposition in the active layer of moist acidic tundra
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DOI：
10.1007/s12275-016-6294-2
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发表时间：
2016-11-01
影响因子：
3
通讯作者：
Lee, Yoo Kyung
中科院分区：
文献类型：
--
作者：
Kim, Hye Min;Lee, Mm Jin;Lee, Yoo Kyung
北极冻土带温度的升高加深了活土层，这是永久冻土的上层，经历了反复的解冻和冻结。土壤温度的升高和活性层的加深似乎对土壤微生物群落有影响。因此，不同土壤深度的土壤微生物群落信息对于了解其对活土层土壤气候变化的潜在响应至关重要。研究了阿拉斯加州潮湿酸性冻土带活动层土壤细菌群落结构。并在5 cm深度的小尺度上解释了它们与土壤相关理化特征的关系。细菌群落结构沿土壤深度变化。随着土壤深度的增加，酸性菌门、γ变形菌门、植物菌门和候选门WPS-2的相对丰度迅速下降，拟杆菌门、绿杆菌门、双胞菌门和候选门AD3的相对丰度迅速增加。在20 cm左右的土壤细菌群落中也发现了结构变化，其中两个有机层（上油层和下油层）被细分。有机质的质量和分解程度可能会影响细菌群落结构。除有机质质量外，细菌群落的垂直分布也与土壤pH和全磷含量有关。本研究以精细尺度分辨率显示了活性层细菌群落的垂直变化，以及土壤有机质质量对细菌群落结构形成的可能影响。
The increasing temperature in Arctic tundra deepens the active layer, which is the upper layer of permafrost soil that experiences repeated thawing and freezing. The increasing of soil temperature and the deepening of active layer seem to affect soil microbial communities. Therefore, information on soil microbial communities at various soil depths is essential to understand their potential responses to climate change in the active layer soil. We investigated the community structure of soil bacteria in the active layer from moist acidic tundra in Council, Alaska. We also interpreted their relationship with some relevant soil physicochemical characteristics along soil depth with a fine scale (5 cm depth interval). The bacterial community structure was found to change along soil depth. The relative abundances of Acidobacteria, Gammaproteobacteria, Planctomycetes, and candidate phylum WPS-2 rapidly decreased with soil depth, while those of Bacteroidetes, Chloroflexi, Gemmatimonadetes, and candidate AD3 rapidly increased. A structural shift was also found in the soil bacterial communities around 20 cm depth, where two organic (upper Oi and lower Oa) horizons are subdivided. The quality and the decomposition degree of organic matter might have influenced the bacterial community structure. Besides the organic matter quality, the vertical distribution of bacterial communities was also found to be related to soil pH and total phosphorus content. This study showed the vertical change of bacterial community in the active layer with a fine scale resolution and the possible influence of the quality of soil organic matter on shaping bacterial community structure.