Mupambwa Hupenyu A, Mnkeni Pearson N S
J Environ Qual. 2016 May;45(3):1087-95. doi: 10.2134/jeq2015.07.0357.
Although it is widely agreed that stocking density critically affects the rate of vermicomposting, there is no established stocking density for mixtures of fly ash and other waste materials. This study sought to optimize (Savigny, 1826) stocking density for effective biodegradation and nutrient release in a fly ash-cow dung-waste paper (FCP) mixture. Four stocking densities of 0, 12.5, 25, and 37.5 g worms kg were evaluated. Although the 12.5, 25, and 37.5 g worms kg treatments all resulted in a mature vermicompost, stocking densities of 25 and 37.5 g worms kg resulted in faster maturity, higher humification parameters, and a significantly lower final C/N ratio (range 11.1-10.4). The activity of β-glucosidase and fluorescein diacetate hydrolysis enzymes showed faster stabilization at stocking densities of 25 and 37.5 g worms kg, indicating compost stability and maturity. Similarly, a stocking density of 25 g worms kg resulted in the highest release of Olsen-extractable P and (NO + NO)-N contents. The 0-, 12.5-, 25-, and 37.5-g treatments resulted in net Olsen P increases of 16.3, 38.9, 61.0, and 53.0%, respectively, after 10 wk. Although compost maturity could be attained at stocking densities of 12.5 g worms kg, for faster production of humified and nutrient-rich FCP vermicompost, a stocking density of 25 g worms kg seems most appropriate.
虽然人们普遍认为饲养密度对蚯蚓堆肥速率有至关重要的影响，但对于粉煤灰与其他废料混合物，尚未确立饲养密度标准。本研究旨在优化（萨维尼，1826年）粉煤灰-牛粪-废纸（FCP）混合物中有效生物降解和养分释放的饲养密度。评估了0、12.5、25和37.5克蚯蚓/千克这四种饲养密度。虽然12.5、25和37.5克蚯蚓/千克的处理都产生了成熟的蚯蚓堆肥，但25和37.5克蚯蚓/千克的饲养密度导致成熟速度更快、腐殖化参数更高，最终碳氮比显著更低（范围为11.1 - 10.4）。β-葡萄糖苷酶和荧光素二乙酸酯水解酶的活性在25和37.5克蚯蚓/千克的饲养密度下显示出更快的稳定，表明堆肥的稳定性和成熟度。同样，25克蚯蚓/千克的饲养密度导致可提取的 Olsen 磷和（NO + NO）-N 含量释放最高。0克、12.5克、25克和37.5克的处理在10周后 Olsen 磷的净增加量分别为16.3%、38.9%、61.0%和53.0%。虽然在12.5克蚯蚓/千克的饲养密度下也可以实现堆肥成熟，但为了更快地生产腐殖化且养分丰富的FCP蚯蚓堆肥，25克蚯蚓/千克的饲养密度似乎最为合适。
