施氮和修剪对混播草坪稳定性的影响

在冬季寒冷、夏季高温的北京地区气候条件下，研究了施氮和修剪对草地早熟禾与结缕草混播草坪的影响。试验处理包括：修剪高度２、３、４ｃｍ；年施氮量０、１５０、４００ｋｇ／ｈｍ２，在春、秋季各施一次。测定了草坪密度、修剪量、质量及病害程度。结果表明：修剪高度和施氮水平影响混播草坪的分蘖比例，且前者的影响程度大于后者。降低修剪高度，混播草坪中结缕草的比例增加，相反则草地早熟禾占优势。随着施氮量增加，草地早熟禾的比例增加，在修剪高度３ｃｍ、施氮量为１５０ｋｇ／ｈｍ２时，草地早熟禾与结缕草的生长趋于平衡，质量稳定，夏季病害少，可保持草坪的稳定性。

Effects of Nitrogen Levels and Cutting Height on the Components and Quality of Turf Mixture of Kentucky Bluegrass ( Poa pratensis L. )and Zoysiagrass ( Zoysia japonica Steud. )

Influence of cutting height (with 2cm, 3cm and 4cm) and N-level (with 0kg/ hm 2, 150kg/ hm 2 and 400kg/ hm 2, each level was given in spring and fall respectively) on the growth of turfgrass mixture of kentucky bluegrass and zoysiagrass was evaluated under climate in Beijing region. Turf density, clippng weight, turf quality and summer disease were investigated. The results showed that the cutting height and N-level exerted an influence upon the proportion of the mixture components. The effect of the cutting hight greater than that of the N-level. Zoysiagrass of the turf mixture grew more rapid when cutting height was reduced to the contrary kentucky bluegrass grew prevailing while increasing N-level kentucky bluegrass grew more rapid. By the treatment of cutting height of 3cm and N-level of 150kg/ hm 2, two mixture components grew equally well, with best turf quality and reduced disease in summer, which maintained stability of the turf mixture.