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Abiotic factors determine functional outcomes of microbial inoculation of soils from a metal contaminated brownfield

机译：非生物因素决定了微生物污染金属污染土壤中微生物接种的功能结果

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Whole community microbial inoculation can improve soil function in contaminated environments. Here we conducted a case study to investigate whether biotic factors (inoculum) or abiotic factors (soil base) have more impact on the extracellular enzymatic activities in a whole community microbial inoculation. To this end, we cross-inoculated microbial communities between two heavy metal-contaminated soils, with high and low extracellular enzyme activities, respectively. We measured extracellular phosphatase activity, a proxy for soil function, after self- and cross-inoculation of microbial communities into sterilized soils, and all activities were normalized to non-inoculated controls. We found that inoculation increased phosphatase activity in the soils. For soils treated with different inocula, we found significant differences in the microbial community compositions but no significant differences in the extracellular phosphatase activities normalized to their respective sterilized, non-inoculated controls (4.7 +/- 1.8 and 3.3 +/- 0.5 for soils inoculated with microbial communities from 146 to 43, respectively). On the other hand, normalized phosphatase activities between the two soil bases were significantly different (4.1 +/- 0.12 and 1.9 +/- 0.12 for soil bases 146 and 43, respectively) regardless of the source of the inoculum that did not vary between soil bases. The results indicate that the abiotic properties of the soils were a significant predictor for phosphatase activity but not for the end-point composition of the microbial community. The findings suggest that targeted microbial inocula from metal contaminated soils can increase phosphatase activity, and likely soil functioning in general, but the degree to which this happens depends on the abiotic environment, in this case, metal contamination.
机译：在污染环境中，整个社区接种微生物可以改善土壤功能。在这里，我们进行了一个案例研究，以调查生物因子（接种物）或非生物因子（土壤基质）在整个社区微生物接种中对细胞外酶活性的影响更大。为此，我们交叉接种了两种重金属污染土壤之间的微生物群落，分别具有高和低的细胞外酶活性。在将微生物群落自我和交叉接种到无菌土壤中后，我们测量了胞外磷酸酶活性（土壤功能的替代物），并将所有活性标准化为未接种对照。我们发现接种增加了土壤中的磷酸酶活性。对于用不同接种物处理过的土壤，我们发现微生物群落组成存在显着差异，但对分别灭菌，未接种对照进行标准化的细胞外磷酸酶活性没有显着差异（接种土壤为4.7 +/- 1.8和3.3 +/- 0.5微生物群落分别为146至43）。另一方面，无论土壤之间没有变化的接种源，两种土壤基质之间的标准化磷酸酶活性均存在显着差异（分别为146和43，分别为4.1 +/- 0.12和1.9 +/- 0.12）。基地。结果表明，土壤的非生物特性是磷酸酶活性的重要预测因子，而不是微生物群落的终点组成。研究结果表明，来自金属污染土壤的目标微生物接种物可以提高磷酸酶活性，并可能在总体上提高土壤功能，但其发生的程度取决于非生物环境，在这种情况下，取决于金属污染。

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