College of Forestry, Beijing Forestry University, Beijing 100083, PR China; Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada T6G 2E3.
College of Forestry, Beijing Forestry University, Beijing 100083, PR China.
Ecotoxicol Environ Saf. 2018 Jul 30;156:197-204. doi: 10.1016/j.ecoenv.2018.03.023. Epub 2018 Mar 20.
Vermicomposting is a promising method for reusing urban green waste. However, high lignin content in the green waste could hinder the development of earthworm and microorganisms and the vermicomposting process, resulting in a low-quality vermicompost product. The objective of this study was to evaluate the effect of bamboo biochar addition (at 0%, 3%, and 6% on a dry w/w basis) on the activity of Eisenia fetida and the obtained vermicompost. Biochar addition increased (P < 0.05) earthworm biomass, juvenile and cocoon numbers of Eisenia fetida, as well as the activities of dehydrogenase, cellulase, urease and alkaline phosphatase. Compared to the control, lignin degradation rate was enhanced up to 13.89% by biochar addition. Biochar addition also improved the vermicompost quality in terms of cation exchange capacity (CEC), dissolved organic carbon (DOC) degradation, humification, nitrogen transformation, toxicity to germinating seeds (Brassica rapa L., Chinensis group) and heavy metals concentrations. The 6% bamboo biochar addition rate achieved maturity after 60 days of vermicomposting and resulted in the highest quality vermicompost based on parameters such as CEC, DOC, NH-N/NO-N ratio, germination index and heavy metal concentration. We conclude that 6% biochar addition promoted earthworm growth and the vermicomposting of green waste.
蚯蚓堆肥是一种很有前途的城市绿色废物再利用方法。然而，绿色废物中高含量的木质素可能会阻碍蚯蚓和微生物的生长和蚯蚓堆肥过程，导致低质量的蚯蚓堆肥产品。本研究旨在评估添加竹生物炭（分别为 0%、3%和 6%，按干物质重量计）对赤子爱胜蚓活性和获得的蚯蚓堆肥的影响。生物炭的添加增加了（P<0.05）赤子爱胜蚓的生物量、幼虫和茧的数量，以及脱氢酶、纤维素酶、脲酶和碱性磷酸酶的活性。与对照相比，生物炭的添加使木质素降解率提高了 13.89%。生物炭的添加还提高了阳离子交换能力（CEC）、溶解有机碳（DOC）降解、腐殖化、氮转化、对发芽种子（白菜，白菜组）的毒性和重金属浓度等方面的蚯蚓堆肥质量。在蚯蚓堆肥 60 天后，添加 6%的竹生物炭达到成熟，并根据 CEC、DOC、NH-N/NO-N 比、发芽指数和重金属浓度等参数获得了最高质量的蚯蚓堆肥。我们得出结论，添加 6%的生物炭促进了蚯蚓的生长和绿色废物的蚯蚓堆肥过程。
