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首页> 外文期刊>Biology and Fertility of Soils >Effect of cadmium contamination with sewage sludge and phosphate fertiliser amendments on soil enzyme activities, microbial structure and available cadmium
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Effect of cadmium contamination with sewage sludge and phosphate fertiliser amendments on soil enzyme activities, microbial structure and available cadmium

机译：污水污泥和磷肥改良剂对镉的污染对土壤酶活性，微生物结构和有效镉的影响

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摘要

The effect of Cd pollution (50 mg kg–1), with and without sewage sludge (Sw) and PO4 3– fertiliser (P) addition, on soil biochemical activity and available Cd was assessed in a 112-day soil incubation experiment. The availability of Cd decreased with incubation time and was reduced by the Sw and P additions resulting in the following order of treatments: Cd>P+Cd>Sw+Cd. With the exception of urease and N-acetylglucosaminidase activities, all enzyme activities were negatively correlated with available Cd. The total culturable bacterial population was significantly higher with the addition of Sw alone than in the control during the incubation period (P<0.05). The number of fluorescent pseudomonads decreased with time, but was significantly increased by the addition of Sw. The total fungal populations decreased with time in all treatments, whilst the addition of Sw and PO4 3– fertilisers relatively increased the fungal population. Addition of Sw in the presence of Cd increased the fungal populations in relation to the addition of Cd alone. The results support the view that Cd contamination has a large detrimental effect on nutrient cycling and microbial activity and that the effects of Cd are reduced by P and Sw additions.
机译：添加和不添加污水污泥（Sw）和PO4 3 – 肥料（P）对Cd污染（50 mg kg-1 ）对土壤生化活性和有效Cd的影响在一个为期112天的土壤培养实验中进行了评估。 Cd的可用性随孵育时间的延长而降低，并且由于Sw和P的添加而降低，导致处理顺序如下：Cd> P + Cd> Sw + Cd。除脲酶和N-乙酰氨基葡萄糖苷酶活性外，所有酶活性均与可利用的镉呈负相关。在培养期间，仅添加Sw的总可培养细菌数量显着高于对照组（P <0.05）。荧光假单胞菌的数量随时间减少，但通过添加Sw显着增加。在所有处理中，真菌总数随时间减少，而添加Sw和PO4 3-肥料相对增加了真菌种群。与仅添加镉相比，在镉存在下添加Sw增加了真菌种群。结果支持了这样的观点，即镉污染对养分循环和微生物活性具有很大的不利影响，并且通过添加P和Sw可以降低Cd的影响。

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