不同浓度保水剂对早熟禾生长过程中节水效果的影响

Effects of Different Concentrations of Water-retaining Agents on Water-saving during Growth Stage of Bluegrass

早熟禾(Poa annuaL.)有着生长快、耐修整、草姿优美等优点。在陕北地区,水资源缺乏成为了城市绿化进程中草坪建植的一大限制因素。当前,保水剂的使用作为成本低且效率高的节水技术,已经得到了关注。试验以早熟禾为试验草种,在充分和限量供水两种不同水分处理条件下,将保水剂浓度设为:0 g·m^(-2)(对照)、0.72 g·m^(-2)、1.44 g·m^(-2)和2.16 g·m^(-2)。分析在不同水分处理条件下,施用不同浓度的保水剂对早熟禾的密度、根冠比、叶片相对含水量以及叶绿素含量的影响。最终结果表明:早熟禾在两种不同水分处理条件下,2.16 g·m^(-2)浓度的保水剂对早熟禾生长密度的效果最好。在限量供水条件下,早熟禾的根冠比、叶片相对含水量、叶绿素含量均在1.44 g·m^(-2)的保水剂浓度处理下,节水效果最佳。

The advantages of Poa annua L.are fast in growth,graceful in grass posture and can be rimmed many times.In northern Shaanxi,water shortage is the major limiting factor for lawn planting in the process of urban greening.At present,the use of water-retaining agent has been drawn attention because of its low cost and high efficiency in water-saving.In this experiment,bluegrass was used as test grass seed,the concentration of water retaining agent was set as:0 g·m^(-2)(CK),0.72 g·m^(-2),1.44 g·m^(-2),2.16 g·m^(-2).The effects of different concentration of water retaining agent on the density,root-crown ratio,relative water content of leaves and chlorophyll content of bluegrass were analyzed under different water treatment conditions.The results showed that 2.16 g·m^(-2) concentration of water-retaining agent had the best effect on the growth density of bluegrass under full and limited water supply conditions.Under the condition of limited water supply,the root to crown ratio,relative water content of leaves and chlorophyll content of bluegrass had the best effect on water-saving when the concentration of water retaining agent was 1.44 g·m^(-2).