城市污泥与园林废弃物堆肥的混合施用对高羊茅萌发与生长的影响

Effects of mixed sewage sludge and garden waste compost on germination and growth of Festuca arundinacea L.

以北京市城市污泥与园林废弃物为研究对象,采用盆栽方法,将污泥产品与园林废弃物堆肥按不同体积配比(1∶0、1∶3、1∶1和0∶1)混合,设置不同混合物施加量(0%、25%、50%、75%和100%混合物),比较其对高羊茅(Festuca arundinacea L.)的发芽以及生长的影响。结果表明:混合物添加对早期发芽率有负面影响,发芽率最高值出现在污泥与堆肥1∶1的25%混合物施加处理中;在整个观测周期内,加入混合物后株高均显著(P<0.05)高于对照,且在后期表现更加明显;单株地上部生物量随着时间的延长各处理均呈现显著增加的趋势,而除了纯污泥处理外,随着施用量的增加,单株地上生物量均呈现降低的趋势;累积地上生物量和地下生物量在各处理下均显著高于对照,最大值出现在污泥与堆肥1∶1的25%混合物施加处理中;污泥与园林废弃物堆肥以不同比例混合后,比对照和仅园林废弃物堆肥对高羊茅的生长影响更明显,但混合物施用量较低时起促进作用,较高时会产生一定的抑制作用,且当两者的配比为1∶1的低施用量条件下高羊茅的生长指标最高。

To assess the effects of sewage sludge and garden waste compost on plant growth, a pot-based experiment was conducted in Beijing, with the two types of compost mixed at four vol- ume ratios （1 ： 0, 1 ： 3, 1 ： 1, and 0 ： 1）, and applied at five levels （0%, 25%, 50%, 75%, and 100% compost mixture）. Germination rate and height growth of Festuca arundinacea were recorded during the experiment. The results showed that germination of F. arundinacea seeds was impacted negatively by the compost addition at the early stage, and the germination rate reached the highest value when sewage sludge and garden waste mixed at volume ratio of 1 ： 1 and applied at 25%. Addition of sewage and garden waste significantly increased the plant height during the experiment period compared to the control （P〈 0.05 ）, especially during the late growing period. Increasing the addition amount of compost mixture greatly decreased the aboveground biomass except for the addition of sewage sludge compost only. Both aboveground and belowground biomasses after compost mixture addition were higher than those of the control, and the highest value appeared in the treatment with sewage sludge and garden waste mixed at 1 ： 1 volume ratio. Generally, the mixture of sewage sludge and garden waste played a more im- portant role in promoting the growth of F. arundinacea than applying garden waste only and the control. Additionally, the effect of mixture addition varied from acceleration to inhibition with in- creasing input amount. It was proved that the mixture of sewage sludge and garden waste compost at 1 ： 1 volume ratio had the greatest effect when added at 25%.