外引高羊茅草坪草种主要性状的周年表现与生理特性研究

从39个美国高羊茅草坪草品种中选出具有各类典型特征的品种，观察这些品种的景观品质、密度、颜色与日生长量等4个重要性状的周年表现。结果表明，1类草种是优质的多功能型草坪草；II类草种适宜建植优质运动场草坪；III类草种可用做保土型混播草坪草；IV类草种可做运动型草坪混播草；V类草种可做运动型兼用草坪草。与此同时，探讨了不同时期草坪草的两个重要的生理指标的变化，结果表明，可溶性糖对草坪草的抗逆性具有调节作用；根系活力的周年变化，对各类草种的周年性状表现具有相当大的影响，其周年变化可反映高羊茅在夏季生长量极小，而在其它季节表现良好的现象。

Characters and Physiocharacteristcs Arround the Year of Tall Fescue from America

Thirtynine tall fescue varieties introduced from America devided into five types with the aid of cluster analysis have been reprted formerly.Based on which,one was selected as the best representive in each type to test four most important characters including visual quality?density?color and growth speed around the year.It showed that type varieties could be used as multifunctional turf varieties.Type varieties could be use as excellent sportsturf varieties.Type varieties could be overseeded with the purpose to prevent soil erosion.Type varieties could be used as sports truf.Most of type could be introduced to act as a good bifunctional turf varieties.Meanwhile,changes of physiology in different time were also analysed.The results indicated that solutable carbohydrate in leaves was in some extent responsible for adjusting the stressresistence.Changes of rootability around the year could explaing the reasons that tall fescue showed poor in summer,but better in other seasons.It implyed that changes of rootability around the year had a great effect on the performance of tall fescue around the year.