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首页> 外文期刊>Soil Biology & Biochemistry >Spatial analysis reveals differences in soil microbial community interactions between adjacent coniferous forest and clearcut ecosystems
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Spatial analysis reveals differences in soil microbial community interactions between adjacent coniferous forest and clearcut ecosystems

机译：空间分析揭示了邻近针叶林和明确生态系统之间土壤微生物群落相互作用的差异

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摘要

Knowledge of how forest management influences soil microbial community interactions is necessary for complete understanding of forest ecology. In this study, soil microbial communities, vegetation characteristics and soil physical and chemical properties were examined across a rectangular 4.57 x 36.58 m sample grid spanning adjacent coniferous forest and clearcut areas. Based on analysis of soil extracted phospholipid fatty acids, total microbial biomass, fungi and Gram-negative bacteria were found to be significantly reduced in soil of the clearcut area relative to the forest. Concurrent with changes in microbial communities, soil macroaggregate stability was reduced in the clearcut area, while no significant differences in soil pH and organic matter content were found. Variography indicated that the range at which spatial autocorrelation between samples was evident (patch size) was greater for all microbial groups analyzed in the clearcut area. Overall, less spatial structure could be resolved in the forest. Variance decomposition using principal coordinates of neighbor matrices spatial variables indicated that soil aggregate stability and vegetation characteristics accounted for significant microbial community spatial variation in analyses that included the entire plot. When clearcut and forest areas were analyzed separately, different environmental variables (pH in the forest area and soil organic matter in the clearcut) were found to account for variation in soil microbial communities, but little of this variation could be ascribed to spatial interactions. Most microbial variation explained by different components of microbial communities occurred at spatial scales other than those analyzed. Fungi accounted for over 50% of the variation in bacteria of the forest area but less than 11% in the clearcut. Conversely, AMF accounted for significant variation in clearcut area, but not forest, bacteria. These results indicate broadly disparate controls on soil microbial community composition in the two systems. We present multiple lines of evidence pointing toward shifts in fungi functional groups as a salient mechanism responsible for qualitative, quantitative and spatial distribution differences in soil microbial communities.
机译：要全面了解森林生态，必须了解森林管理如何影响土壤微生物群落之间的相互作用。在这项研究中，在横跨相邻针叶林和阔叶林的一个矩形的4.57 x 36.58 m的矩形样本网格上，研究了土壤微生物群落，植被特征以及土壤理化性质。根据对土壤中提取的磷脂脂肪酸的分析，发现相对于森林，该林区的土壤中微生物总生物量，真菌和革兰氏阴性细菌明显减少。与微生物群落的变化同时，在明晰地区土壤宏观团聚体的稳定性降低，而土壤pH和有机质含量没有显着差异。变异函数法表明，对于在明确区域进行分析的所有微生物组，样本之间空间自相关（补丁大小）明显的范围更大。总体而言，森林中较少的空间结构可以解决。使用邻域矩阵空间变量的主坐标进行方差分解表明，在包括整个图块的分析中，土壤团聚体的稳定性和植被特征是微生物群落空间变化的重要原因。当分别对林区和林区进行分析时，发现不同的环境变量（林区中的pH值和林区中的土壤有机质）可解释土壤微生物群落的变化，但这种变化很少归因于空间相互作用。由微生物群落的不同组成部分解释的大多数微生物变异发生在空间尺度上，而不是分析的尺度上。真菌占森林区域细菌变异的50％以上，但在裸露的土壤中占不到11％。相反，AMF造成了明确区域的显着变化，而森林细菌则没有。这些结果表明在两个系统中对土壤微生物群落组成的控制大相径庭。我们提出了多种证据，指出真菌功能组的转变是引起土壤微生物群落定性，定量和空间分布差异的重要机制。

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