三种园林植物幼苗生长节律对城市污泥的响应

Growth rhythm of three landscape plant species planting on municipal sewage sludge

探究澳洲火焰木、复羽叶栾树和幌伞枫幼苗株高/地径生长节律和生物量对城市污水污泥的响应,为污泥在园林绿化中的资源化利用提供参考依据。通过为期1年的盆栽试验,定期测定赤红壤(CK)、污泥-赤红壤基质(质量比各50%,S50)和100%污泥(S100)中种植的上述3种植物幼苗株高和地径,利用Logistic方程构建植物生长模型,对比分析3种植物在不同基质中的生长节律和生物量变化。结果表明:(1)与CK相比,S50和S100显著促进澳洲火焰木株高、幌伞枫株高/地径和复羽叶栾树地径的生长,显著增加幌伞枫株高和地径的最大月生长量和总生长量;各处理复羽叶栾树株高、地径的最大月生长量均小于澳洲火焰木和幌伞枫。(2)3种植物株高和地径的Logistic生长模型拟合效果达到极显著水平(P<0.01);试验期内3种植物株高和地径的生长阶段可划分为生长初期、速生期、生长后期。(3)在S50和S100处理中幌伞枫的根生物量、茎生物量、叶生物量和质量指数均高于CK;S50处理3种植物中幌伞枫质量指数最高(14.20),S100处理中幌伞枫和澳洲火焰木的质量指数显著大于复羽叶栾树。从试验期内的生长表现看,幌伞枫的污泥适应性最好,澳洲火焰木次之,复羽叶栾树适应性较弱。Logistic生长模型能较好预测和分析植物苗期生长规律,并反映了不同植物对污泥的生长响应。

We explored the variations of seedling height and ground diameter growth rhythm and biomass of Brachychiton acerifolius,Koelreuteria bipinnata and Heteropanax fragrans on municipal sewage sludge,aiming to provide reference for the resource utilization of sewage sludge in landscape greening.In a 1-year pot experiment,we measured height and ground diameter of seedlings of the three species planting on red soil(CK),sludge-red soil substrate(mass ratio 50%,S50),and 100%sludge(S100).Logistic equation was used to establish the model of plant growth.Growth rhythm and biomass of three species on different substrates were comparatively analyzed.The results showed that:(1)Compared with CK,S50 and S100 significantly increased height of B.acerifolius,height and ground diameter of K.bipinnata,and ground diameter of H.fragrans.S50 and S100 also increased maximum monthly growth and total increment of height and ground diameter of H.fragrans.The maximum monthly growth of height and ground diameter of K.bipinnata was lower than that of B.acerifolius and H.fragrans.(2)The Logistic growth model fitting effect of height and ground diameter reached extremely significant level(P<0.01).The growth phases of plant height and ground diameter were divided into early growth phase,rapid growth phase,and late growth phase.(3)Root biomass,stem biomass,leaf biomass and quality index of H.fragrans were higher in S50 and S100 than in CK.H.fragrans had the highest quality index(14.20)in S50 among the three species,and the quality index of H.fragrans and B.acerifolius in S100 treatment was significantly higher than that of K.bipinnata.According to the growth performance,H.fragrans had the best sludge adaptability,followed by B.acerifolius and K.bipinnata.The Logistic growth model could better predict and analyze the growth pattern at seedling stage,which reflected the growth response of different plant species to sewage sludge.