6种冷季型草坪草在湿润亚热带生长观测

对6种冷季型草坪革的22份材料进行了盆栽引种试验和修剪状态下的生长观测。结果表明：6种草坪草早期分蘖速度由大到小依次是：匍匐翦股颖＞紫羊茅＞多年生黑麦革＞高单茅＞草地早熟禾，高温潮湿的夏季高羊茅和匍匐翦股颖的分蘖数目仍在缓慢增加，其它4草种均出现分蘖数目减少，以粗茎早熟禾最为明显。播种当年均未进行生殖生长，次年结实，高羊茅、多年生黑麦草结实率分别达到90％和85％。修剪条件下，全年累计生长高度多年生黑麦草为200．1cm，紫羊茅为159．9cm，匍匐翦股颖为156．3cm，高羊茅为138．4cm，草地早熟禾为126．8cm，粗茎早熟禾为108．5cm；6种草均出现播种早期生长最快，夏季减慢，秋季加快，冬季最慢和春季逐渐加快的总趋势，呈现两个生长高峰期。全年生长由最好到差的顺序为高羊茅、匍匐翦股颖、多年生黑麦草、草地早熟禾、粗茎早熟禾。

The Growth Observations of Six Cool-Season Turf grasses in Humid Subtropical Zone

Studies of 6 cool-season turfgrasses cultivated in pot condition on evaluation of introduction and growth under cutting condition were conducted. The introduction experimental results show: tillering rate on early on early growing stage is creeping bentgrass > red fescue >perennial ryegrass > tall fescue > kentucky bluegrass. During warm and humid summer, the number of tillers of tall fescue and creeping bentgrass increases slowly, but the tiller number of four other cool-season grasses decreases, especially of the rough bluegrass. No reproductive growth appeares in the first year. The tall fescues and perennial ryegrasses have 90 % and 85 % seed bearing rate respectively in the second year. The cutting experimental results show: the annual clipping height of the perennial ryegrasses, red fescues, creeping bentgrasses, tall fescues, kentucky bluegrasses and rough bluegrass are 200. 1cm, 159. gcm, 156. 3cm, 138. 4cm, 126. 8cm and 108. 5cm. The height growth pattern under cutting condition of the 6 specieses isfast in spring and fall, medium in summer and slow in winter, and a two-peaks curve appears. In the warm-humid summer, the tall fescues are the best and the rough bluegrass is the worst among the six specieses. The sequence of turf quality from the best to the worst is tall fescue, creeping bentgrass, perennial ryegrass, kentucky bluegrass and rough bluegrass.