城镇排水污泥制成的有机营养土对油松种子萌发的影响

Effects of Organic Nutrient Soil Made from Urban Sewage Sludge on Seed Germination of Pinus tabuliformis

为促进资源的合理利用和可持续发展,本研究使用高级厌氧消化技术处理城镇排水污泥,将其制成有机营养土,通过实验室种子萌发试验,将城镇排水污泥制成的有机营养土与取自北京市大兴区黄垡苗圃的表层沙土进行不同比例的混合后,用蒸馏水浸提制成营养液,作为油松种子萌发的供给水分。结果表明:油松种子发芽率、日均发芽率和发芽指数在污泥占比60%最高,发芽势、发芽值和发芽峰值在污泥占比80%时最高,平均发芽时间在污泥占比40%时最短,平均发芽系数在污泥占比20%时最高。整体来看,所有指标均随着污泥占比减少呈先促进萌发后抑制萌发的趋势,即添加适量的污泥制有机营养土对油松种子萌发有促进作用。因此,采用城镇排水污泥制成的有机营养土作为油松播种育苗的基肥和种肥是可取的,同时在油松林林下施用污泥制有机营养土对油松的实生天然更新具有促进作用,可以考虑其应用推广,但需要合理控制污泥的用量。

In order to promote the rational use of resources and sustainable development,this study used advanced anaerobic digestion technology to treat urban sewage sludge and turn it into organic nutrient soil.Through the laboratory seed germination test,the organic nutrient soil made from urban sewage sludge and the surface sand from the Huangfa nursery in Daxing District,Beijing were mixed in different proportions,and then extracted with distilled water to make a nutrient solution,which was used as water supply for seed germination of Pinus Tabuliformis.The results showed that the germination rate,daily average germination rate and germination index of Pinus tabuliformis were the highest when the proportion of sludge was 60%,the germination potential,germination value and germination peak were the highest when the proportion of sludge was 80%,the average germination time was the shortest when the proportion of sludge was 40%,and the average germination coefficient was the highest when the proportion of sludge was 20%.On the whole,with the decrease in the proportion of sludge,the germination had shown a trend of first promoting and then suppressing.That is,adding an appropriate amount of organic nutrient soil made from sludge can promote the germination of Pinus tabuliformis.Therefore,it is advisable to use organic nutrient soil made from urban sewage sludge as the base fertilizer and seed fertilizer for Pinus tabuliformis sowing and seedling.At the same time,applying sludge to organic nutrient soil under Pinus tabuliformis forest has a significant effect on the natural regeneration of Pinus tabuliformis.The promotion effect can be considered for its application and promotion,but the amount of sludge needs to be controlled reasonably.