兰州地区再生水灌溉对冷季型草坪草土壤养分的影响

Effects of reclaimed water on soil nutrient of cool-season turfgrass in Lanzhou

本试验以兰州地区常见冷季型草坪草黑麦草(Lolium perenne)品种首相(Premier)、潘多拉(Panterra),草地早熟禾(Poa pratensis)品种百斯特(Barrister)、百胜(Barvictor),高羊茅(Festuca arundinacea)品种凌志(Barlexas)、易凯(Easy Care),以及白三叶(Trifolium repens)品种努克(Nanouk)和紫花苜蓿(Medicago sativa)品种阿尔冈金(Algonguin)为研究对象,利用兰州大学榆中校区污水处理中心的再生水对其灌溉,以自来水灌溉为对照。通过温室盆栽试验,研究了再生水灌溉处理下冷季型草坪草的土壤特性变化。试验发现,再生水灌溉处理的土壤有机质含量极显著高于对照(P<0.01),土壤速效钾、碱解氮和土壤全氮含量均显著高于对照(P<0.05)。除首相、潘多拉外,其他6种供试植物的土壤全磷含量均显著高于对照(P<0.05)。除紫花苜蓿外,其他7种绿地植物的土壤全钾、全钠含量均高于对照,差异显著(P<0.05)。综上研究表明,再生水中富含的营养元素不仅能显著提高土壤的有机质含量而且还能有效改善土壤速效养分供应状况。因此,在兰州地区合理利用再生水对绿地进行灌溉具有可行性。

Cool-season turf grass in Lanzhou including perennial ryegrass(Lolium perenne cv.Premier and L.perenne cv.Panterra),Kentucky bluegrass(Poa pratensis cv.Barvictor and P.pratensis cv.Barrister),tall fescue(Festuca arundinacea cv.Barlexas and F.arundinacea cv.Easy Care),white clover(Trifolium repens cv.Nanouk)and alfalfa(Medicago salivacv.Algonquin)were irrigated with both tap water and reclaimed water from Lanzhou University Yuzhong Sewage Treatment Center to test the effects of reclaimed water on the soil characteristics.The results showed that reclaimed water could significantly improve(P<0.05)soil available nutrient and total nitrogen and very significantly increase(P<0.01)soil organic matter.There was no significant difference between total phosphorus contents of perennial ryegrass with tap water and reclaimed water treatments.Total potassium and sodium content of soil with reclaimed water treatment was significantly higher(P<0.05)than those of soil with tap water treatment except with those of alfalfa.In conclusion,reclaimed water have rich nutrition elements which can be applied for turfgrass irrigation in Lanzhou.