Jimma University, College of Agriculture, 307, Jimma, Ethiopia.
Czech University of Life Sciences Prague, Department of Agro-environmental Chemistry and Plant Nutrition, Kamýcká 129, 16500 Prague, Czech Republic.
Waste Manag. 2021 Apr 15;125:220-234. doi: 10.1016/j.wasman.2021.02.043. Epub 2021 Mar 9.
Although microbial inoculants are promoted as a strategy for improving compost quality, there is no consensus in the published literature about their efficacy. A quantitative meta-analysis was performed to estimate the overall effect size of microbial inoculants on nutrient content, humification and lignocellulosic degradation. A meta-regression and moderator analyses were conducted to elucidate abiotic and biotic factors controlling the efficacy of microbial inoculants. These analyses demonstrated the beneficial effects of microbial inoculants on total nitrogen (+30%), total phosphorus (+46%), compost maturity index (C:N ratio (-31%), humification (+60%) and the germination index (+28%). The mean effect size was -46%, -65% and -40% for cellulose, hemicellulose, and lignin respectively. However, the effect size was marginal for bioavailable nutrient concentrations of phosphate, nitrate, and ammonium. The effectiveness of microbial inoculants depends on inoculant form, inoculation time, composting method, and experimental duration. The microbial inoculant effect size was consistent under different feedstock types and experimental scales. These findings imply that microbial inoculants are important for accelerating lignocellulose degradation. Higher mean effect sizes have tended to be published in journals with higher impact factors, thus researchers should be encouraged to publish non-significant findings in order to provide a more reliable estimation of effect size and clarify doubts about the benefits of microbial inoculants for composting.
虽然微生物接种剂被宣传为改善堆肥质量的一种策略，但在已发表的文献中，它们的效果并没有达成共识。进行了定量荟萃分析，以估计微生物接种剂对养分含量、腐殖化和木质纤维素降解的综合效应大小。进行了元回归和调节因子分析，以阐明控制微生物接种剂效果的非生物和生物因素。这些分析表明，微生物接种剂对总氮（增加 30%）、总磷（增加 46%）、堆肥成熟指数（C:N 比（减少 31%）、腐殖化（增加 60%）和发芽指数（增加 28%）有有益的影响。纤维素、半纤维素和木质素的平均效应大小分别为-46%、-65%和-40%。然而，对于磷酸盐、硝酸盐和铵盐的生物有效养分浓度，其效应大小则较为边缘。微生物接种剂的有效性取决于接种剂的形式、接种时间、堆肥方法和实验持续时间。在不同的原料类型和实验规模下，微生物接种剂的效果大小是一致的。这些发现意味着微生物接种剂对于加速木质纤维素的降解很重要。在具有较高影响因子的期刊上，平均效应大小往往更高，因此应该鼓励研究人员发表非显著发现，以便更可靠地估计效应大小，并澄清对微生物接种剂在堆肥中益处的疑虑。
