To deal with the problems of increasing the heavy metal (HM) bioavailability and declining the soil biological properties resulting from a direct application of solid digestate (SD). A low-temperature fruit biochar and pig-SD (BSD-0, BSD-1, BSD-2, BSD-4, BSD-8) co-application experiment was performed to evaluate enzyme activities and HM bioavailability in Cd-polluted greenhouse soil. The advantage of BSD co-applications compared to SD application was maintained the stable of pH and electrical conductivity (EC) in soil and was more effective to improve soil organic matter (OM). BSD-8 treatment significantly promoted the uptake of available nitrogen, available phosphorus, and available potassium by plants. The immobilization effect of BSD co-applications on Cu, Zn, and Cd was better than SD application. BSD-8 treatment has the best immobilization effect on Cd and the contents of bioavailable Cd was 0.167 mg kg−1. The optimal enzyme activities of invertase, urease, and alkaline phosphatase were shown in BSD-8 treatment, which were 0.027 mg glucose g−1 soil h−1, 88.654 mg NH3-N g−1 soil h−1, and 15.766 μmol PNP g−1 soil h−1, respectively. The activities of enzymes also were influenced by soil physicochemical properties and HM bioavailability. BSD-8 treatment was suggested as an appropriate mixing proportion to alleviate soil acidification and salinization, decreasing HM bioavailability and stimulating enzyme activities in Cd-polluted soil.
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We are thankful to the Risk Assessment Lab of the Quality Safety of Biomass Fermentation Products (Chengdu) Ministry of Agriculture and Rural Affairs for technical assistance.
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Microsoft Excel 2010 software was used to analyze the standard deviations and statistical differences of the data and to make the diagrams in the paper. SPSS (Version 22, USA) software was used to determine the correlations.
The research was supported by the Agricultural Special Project of Shaanxi province (No. SNYJC-2018-43), the Scientific Research Project of Biogas Institute of Ministry of Agriculture and Rural Affairs (No. NYBZKS-2019-XND01), and the Agricultural Science and Technology Innovation Program (ASTIP) of Chinese Academy of Agricultural Sciences.
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Xue, S., Chen, F., Wang, Y. et al. Effects of Co-Applications of Biochar and Solid Digestate on Enzyme Activities and Heavy Metals Bioavailability in Cd-Polluted Greenhouse Soil. Water Air Soil Pollut 232, 140 (2021). https://doi.org/10.1007/s11270-021-05089-0
- Available nutrients
- Enzyme activity
- Heavy metals
- Solid digestate