钾肥对假俭草草坪种群形成的影响  

The influence of potassium on population formation of Eremochloa ophiuroides lawn

作　　者：刘金平[1] 游明鸿[1] 毛凯[1] 张新全[1] 

机构地区：[1]四川农业大学草业科学系,四川雅安625014

出　　处：《植物资源与环境学报》2004年第4期24-27,共4页Journal of Plant Resources and Environment

基　　金：四川省青年基金资助项目(02ZQ026 057);国家科技部星火计划资助项目(2004EA810010)

摘　　要：　以四川峨眉山野生假俭草(EremochloaophiuroidesL.)为实验材料,施以不同浓度的K肥(1 0～2.5g·m-2K2O),观察草坪种群形成过程。结果表明,1.0和1.5g·m-2K2O处理组假俭草的生长速度与对照差异显著(P<0.05);1.0、1.5和2.0g·m-2K2O处理组的平均分蘖数与对照的差异达极显著水平(P<0.01);1.5g·m-2K2O处理组根系长度与对照差异达显著水平(P<0.05);4个处理组的根冠比分别比对照增加了35.61%、50.61%、21.91%和20.90%。其中1.5g·m-2K2O处理组与对照差异达显著水平(P<0.05)。低浓度处理(1.0和1.5g·m-2K2O)使草坪成坪时间提前3～5d。钾对假俭草草坪种群形成有影响,适宜施用量为1.0～1.5g·m-2K2O。钾肥主要在施用1～3周内起作用,5～10d肥效高,而后逐渐减弱。Through random trial design with four K gradients(1.0, 1.5, 2.0 and 2.5 g·m^(-2) K_(2)O), the effect of potassium on lawn population formation of wild Eremochloa ophiuroides L. from Mt. E-mei in Sichuan Province was investigated. It was found that compared with the control, both 1.0 and 1.5 g·m^(-2) K_(2)O treatments had a significant difference in growth velocity (P < 0.05);for average tiller number,1.0-2.0 g·m^(-2) K_(2)O treatments were all highly significant(P<0.01); as to root system, 1.5 g·m^(-2) K_(2)O treatment was significantly different with CK. The root/shoot ratio of four treatments increased by 35.61%, 50.61%, 21.91% and 20.90% respectively, and 1.5 g·m^(-2) K_(2)O treatment was significant difference with CK. Both 1.0 and 1.5 g·m^(-2) K_(2)O treatments could form lawn ahead of 3-5 d. Therefore, K has a positive effect on lawn population formation and the proper fertilizer quantity is 1.0-1.5 g·m^(-2) K_(2)O. After K applied, it has obvious effect in 1-3 weeks and the high efficiency is after 5-10 d and gradual weakening after that.

关 键 词：钾肥 假俭草 草坪 种群形成 生长速度 

分 类 号：S688.4[农业科学—观赏园艺]