Abstract: Leaf area index of turfgrass is an essential parameter for the study of photosynthesis,evapotranspiration,water utilization efficiency,and greenness index of turfgrass,etc.In order to provide the information on the relationship between leaf area index and evapotranspiration,the effect of plant density on the individual plant leaf area and leaf area index of Zoysia japonica Steud.was studied under three different trimming height levels.The results show that the leaf area of individual plant reduced gradually along with the increasing of plant density under the different trimming heights,and the reducing rate of low-density was notably higher than that of high-density.Along with the increase of plant density,the leaf area index of Z.japonica increased and showed very significant difference among the treatments(P<0.05) with a peak at 140 no.?100 cm^-2 and decline at 145 no.?100 cm^-2.The trimming height had significantly effect on the leaf area of individual plant and leaf area index of Z.japonica(P<0.01).The leaf area of individual plant and leaf area index of Z.japonica under high-trimming height was higher than that under low-trimming height,especially in the high plant density range of 115 to 145 no.?100 cm^-2.

Key words: Zoysia japonica Steud., Density, Leaf area of individual plant, Leaf area index

摘要： 以日本结缕草(Zoysia japonica)为试验材料,探讨3个修剪高度条件下密度对单株叶面积和叶面积指数的影响,为进一步研究草坪草蒸散量与叶面积指数的关系提供参考.结果表明:各修剪高度条件下,结缕草单株叶面积随密度增加逐渐减小,低密度的减小速率明显大于高密度;随着密度的增加,结缕草叶面积指数增加,处理间差异显著(P<0.05),密度为140株/100 cm²时最大,密度高于140株/100 cm²开始下降.结缕草单株叶面积和叶面积指数受修剪高度影响显著(P<0.01),高修剪处理的单株叶面积和叶面积指数均明显高于低修剪处理,尤其在高密度区(115~145株/100 cm²).

关键词: 结缕草, 密度, 单株叶面积, 叶面积指数