Soil cadmium (Cd) pollution resulting from anthropogenic activities has become a major concern for microbial and biochemical functions that are critical for soil quality and ecosystem sustainability. Organic amendments can reduce Cd toxicity to the microbial community and enzymatic activity in Cd-polluted soils and thus would increase the ecological dose (ED) values. However, there has been less focus on the effect of organic amendments on microbial and biochemical responses to Cd toxicity in non-calcareous soils using the concept ED. The aim of this study was to assess the impact of compost application on microbial activity, microbial biomass, turnover rates of carbon and nitrogen, and enzymatic activities as the key ecological functions in a non-calcareous soil spiked with different Cd concentrations (0–200 mg kg⁻¹). Results showed that soil amendment with compost decreased Cd availability by 48–76%, depending on the total soil Cd content. The application of compost reduced the negative influence of Cd eco-toxicity on most soil microbial and biochemical functions by 20–122%, depending on the Cd level and the assay itself. The ED values, derived from the sigmoidal dose-response and kinetic models, were 1.10- to 2.24-fold higher in the compost-amended soils than the unamended control soils at all Cd levels. In conclusion, the potential risks associated with high levels of Cd pollution can be alleviated for microbial and biochemical indicators of soil quality/health with application of 2500 kg ha⁻¹ compost as a cost-effective source of organic matter to non-calcareous soils. The findings would have some useful implications for organic matter-limited non-calcareous soils polluted with Cd.

人为活动引起的土壤镉污染已成为微生物和生化功能的主要关注点，而微生物和生化功能对于土壤质量和生态系统的可持续性至关重要。有机改性剂可以减少Cd对微生物群落的毒性和Cd污染土壤中的酶活性，从而增加生态剂量（ED）值。但是，使用ED概念对有机改良剂对非钙质土壤中Cd毒性的微生物和生化反应的影响的关注较少。这项研究的目的是评估堆肥对微生物活性，微生物生物量，碳和氮的周转率以及酶活性的影响，作为在不同镉浓度（0–200）下加钙的非钙质土壤的关键生态功能。毫克公斤^-1）。结果表明，堆肥对土壤的改性作用使Cd的利用率降低了48–76％，具体取决于土壤中Cd的总量。堆肥的施用减少了Cd生态毒性对大多数土壤微生物和生化功能的负面影响，降低幅度为20–122％，具体取决于Cd含量和测定方法本身。从S形剂量响应和动力学模型得出的ED值，在所有镉水平下，堆肥改良土壤的ED值比未改良对照土壤高1.10至2.24倍。总之，通过施用2500 kg ha ^-1的土壤质量/健康的微生物和生化指标，可以减轻与高水平Cd污染相关的潜在风险。堆肥作为非钙质土壤中有机物的经济有效来源。该发现对受镉污染的有机质有限的非钙质土壤具有一定的有益意义。