风干污泥组配基质对草坪植物生理生态影响

Influence of Air-dried Sewage Sludge Mixed Medium on Ecophysiology of Turfgrass

将风干污泥和土壤按照不同比例混合作为草坪植物栽培基质,通过盆栽试验,研究了组配基质对两种草坪植物—黑麦草和高羊茅生理生态特性的影响。结果表明,不同比例风干污泥混合基质对草坪植物地上生物量、株高、叶绿素含量均有显著的促进作用,与对照相比,黑麦草和高羊茅的地上生物量分别增加了148.8%～193.0%和148.6%～159.6%,总叶绿素含量分别提高了64.2%～103.0%和44.8%～54.5%。同时,风干污泥的加入显著增加了草坪草过氧化氢酶(CAT)和过氧化物酶(POD)的活性,其中黑麦草以污泥土壤比为3∶13的CAT和POD酶活最高,较对照分别增加了132.7%和33.2%,高羊茅3个处理间无显著性差异。风干污泥组配基质中黑麦草丙二醛(MDA)含量显著升高,膜透性增加;高羊茅S100处理MDA含量与相对电导率较对照无显著差异。综合分析表明,将污泥风干后和土壤组配成草坪基质,可有效促进草坪植物生长,而且缩短了污泥堆肥化时间,降低了其再利用成本。

Turfgrasses were planted in mixed medium with air-dried Sewage sludge and soil, and the ecophysiological characteristics of two turfgrass cultivars Lolium perenne and Festuca arundinacea were investigated. The results showed that the mixed medium with different proportions of air-dried sewage sludge and soil had positive effect on the increments of dry matter yield, plant height and chlorophyll content of turfgrass. As compared with control, the dry matter yield of L. perenne and F. arundinacea increased by 148.8% - 193.0% and 148.6% - 159.6%, respectively. The total chlorophyll contents of two turfgrasses were 64.2% - 103.0% and 44.8% -54.5% higher than that of control, respectively. Meanwhile, the addition of air-dried sewage sludge in turf medium significantly increased catalase （CAT） and peroxidase （POD） activities. The maximums of CAT and POD for L. perenne were observed in the treatment of sludge： soil （3：13）, which were 132.7 % and 33.2% higher than that of control, respectively. However, there was no significant difference in CAT and POD activities among three treatments of F. arundinacea. Malonaldehyde （MDA） content of L. perenne increased in mixed medium of sewage sludge and soil as well as relative electrical conductivity. For F. arundinacea, MDA content and relative electrical conductivity had ho significant difference between the treatment of S100 （700 g soil ＋ 100 g sewage sludge） and control. Based on the above analyses, mixed air-dried sewage sludge and soil as turfgrass medium can not only promote turfgrass growth, but also shorten the time of sewage sludge composting and reduce the cost of sewage sludge reutilization.