Abstract: 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 volume 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 important 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 increasing 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%.

Key words: urban green infrastructure (UGI), landscape connectivity, Nanjing City., morphological spatial pattern analysis (MSPA)