Abstract: Subsurface drip irrigation is better in water saving and management for lawn in comparison with the spray irrigation.In order to explore the appropriate emitter burying depth of subsurface drip irrigation,the soil water distribution and turfgrass growth characteristics under subsurface drip irrigation were observed and analyzed by the simulative experiment and filed test.The results show that the wetting front migration distance decreased in the vertical direction and increased in horizontal direction along with the increase in emitter burying depth at a given flow rate and irrigation time.For the same emitter burying depth,the water content distribution was symmetrical on both sides from the emitter.The aboveground biomass under the treatment of 20 cm emitter burying depth was significantly higher than those under other treatments in quick growth stage(P<0.05).No significant effect of emitter burying depth on sward density was detected.Emitter burying depth affected root distribution to some degree,the root density and underground biomass increased obviously nearby the emitter of drip irrigation system.

Key words: Subsurface drip irrigation, Emitter burying depth, Wetting front, Soil water content, Tall fescue

摘要： 草坪地下滴灌与喷灌相比,具有节水、方便管理等优点。为了掌握滴灌中滴头的适宜埋设深度,通过模拟及实地试验,对地下滴灌土壤水分分布及其对草坪生长的影响进行了观测分析。结果表明:在流量和灌水时间一定的情况下,随着埋深的增加,湿润锋在水平方向的运移距离减小,在垂直方向上增大;相同埋深时,滴头两侧的含水率分布对称。在高羊茅((Festuca arundinacea Schreb. cv. Pixie))生长旺季,不同埋深处理对地上生物量影响显著(P<0.05),埋深20cm显著高于其他处理(P<0.05);不同埋深处理植株密度差异不显著;不同埋设深度对高羊茅根系分布有一定的影响,在每个滴头附近的根系密度和重量明显增加。

关键词: 地下滴灌, 埋设深度, 湿润锋, 含水率, 高羊茅