【摘要】 通过对不同播种期和不同疏草强度的试验,研究了影响杭州湾地区狗牙根草坪秋季追播黑麦草冬前成坪的关键气候因子和追播技术。结果表明,播种时的气温显著影响黑麦草的出苗时间、出苗率、生长速度和出苗整齐度,10月中上旬日平均气温在18~23℃时追播的黑麦草,出苗前期生长状况最好,而疏草强度对上述指标的影响则不显著(P>0.05)。然而,当苗期积温>500℃时,不同疏草强度下黑麦草密度和成坪后均匀度之间呈现出显著的差异(P<0.05),只有在疏草强度足够大时(≥50%),草坪的密度和均匀度才能够达到理想状态,且随苗期积温的增加,疏草强度也相应增加时才能保证黑麦草成坪后的良好景观。更多还原

【Abstract】 A field experiment was designed to determine key factors affecting the formation of winter of perennial ryegrass turf over-seeded with bermudagrass in autumn in Hangzhou Bay area.The daily average air temperature at over-seeding and germination stages significantly affected the germination time,germination rate,growth rate and seedling evenness.And 18 to 23 ℃ were the most proper temperatures in the first half of October.The intension of vertical cut was not a key factor,however,it significantly affected the turf density and evenness at the late stage(P<0.05) when the accumulated temperature at seedling stage(30 days after over-seeded) was over 500 ℃,and the intension of vertical cut of bermudagrass should be kept higher(≥50%) to get the ideal turf.In conclusion,considering the initial growth,turf density and final turf quality,the best time for perennial ryegrass over-seeding was before mid-October,with the daily average air temperature ranging from 18 to 23 ℃,and the most proper time for turf formation was before mid-November.更多还原