绿化植物废弃物堆肥对城市绿地土壤的改良效果

针对城市中普遍存在的绿地土壤退化和有机废弃物处理处置难的现状,选择典型城市土壤进行绿化植物废弃物堆肥不同用量的绿地现场土壤改良实验.结果表明:绿化植物废弃物堆肥能提高土壤持水能力;降低土壤的酸碱度;增加土壤有机质、总N、总P、有效P、生物量C、N和微生物总量;堆肥对土壤全K的含量总体影响不大,但速效K的含量却成倍增加;说明绿化植物废弃物能改善土壤理化性质,提高土壤肥力,且随着堆肥用量的增加,对土壤的改良作用也越显著;鉴于绿化植物废弃物高C/N,其用量宜控制在13240 kg/hm~2以内.绿化植物废弃物堆肥就地利用即能改良城市退化土壤,又减少城市废弃物量,有利于提高城市生态环境质量.

Effects of green plant waste compost on soil remediation in urban greenbelts

For the fact of the degradation of urban greenbelt soils and the difficulty in disposal of organic waste in the city, we have remedied the quality of some typical urban soils by using different amounts of green plant waste compost, a typical product of urban greening waste. The results showed that the compost could improve soil quality by enhancing water conservation, reducing soil pH value, increasing the contents of organic matter, total nitrogen, total and soluble phosphorus, microbial biomass C and N and the population of total microorganism. Although the compost had little effect on the total potassium content of soils, it significantly increased the content of rapidly available potassium by two fold. It proved that the compost could remediate soil physiochemical characteristics and improve the soil quality, and the efficiency of soil remediation increased with the increase of the compost amount used. In general, utilization of green plant waste compost has obvious impact in restoring urban degraded soils and in reducing the amount of urban waste, and it is useful for improving the urban ecological quality.