【作者】 刘连斌；

【导师】 江海东；

【作者基本信息】 南京农业大学 ， 作物栽培学与耕作学， 2007， 硕士

【摘要】 运用高羊茅为复播草种复播狗牙根草坪以研究不同播种量、修剪高度和播期对狗牙根草坪的影响和运用De wit实验设计研究不同混种比例和修剪高度对高羊茅和狗牙根种间竞争力的影响，以阐明高羊茅复播狗牙根草坪的技术及原理，明确了适宜的播种量、播期和修剪高度。试验结果表明：1、运用高羊茅复播狗牙根草坪时，高羊茅播种量为35g／m~2。最为适宜。播种量为15g／m~2。时，冬季低温期间高羊茅总茎蘖数较低，不能起到延长草坪绿期和提高草坪使用效率的效果，播种量为50g／m~2。时翌年狗牙根返青受到影响，室内实验也证明这一点，高羊茅混种数量较多时，狗牙根种间竞争力显著降低，对狗牙根的返青生长不利，严重影响夏季高温期间高羊茅休眠时草坪质量、颜色和绿色盖度。2、复播时播期应选在10月中下旬，适当提早播期不仅能使复播草坪冬前成坪，延长草坪绿期，还能对高羊茅植株起到壮苗作用，在翌年草坪返青期间进一步提高草坪质量、颜色和绿色盖度。播期为11月5日，由于低温影响高羊茅发芽出苗，即使增加播种量也不能在冬前成坪，不能起到延长草坪绿期的作用，而且播种量高时影响狗牙根翌年返青生长，从而影响夏季草坪表观性状。3、复播高羊茅后，应降低修剪高度，本试验中，修剪高度为3cm处理的狗牙根密度和草坪密度显著高于4cm和5cm处理，夏季高羊茅枯死期间3cm处理草坪表观形状显著高于4cm和5cm，竞争试验结果也表明，高羊茅混种比例小的情况下，修剪高度为3cm处理的狗牙根种间竞争力显著高于4cm和5cm处理，降低修剪高度有利于狗牙根的返青生长。更多还原

【Abstract】 Tall fescue was used for overseeding into bermudagrass turf. The effect of the seeding rate, seeding date and cutting height of tall fescue on bermudagrass turf, and the effect of competition between tall fescue and bermudagrass was studied by an experiment using the method of de Wit. The trial studied for the purpose of the technique and mechanism and approprate of overseeding bermudagrass with tall fescue. The main results were as follows:1. The resulteds showed that the 35g/m~2 of seeding rate was the most approprate while overseeding bermudagrass with tall fescue. The seeding rate of 15g/m~2 couldn’t prolong the green period because the total tillers of tall fescue were lower in winter. The 50g/m~2 could restrain the growth of bermudagrass next year. The result was also showed in the trial of competetion. The competetion of Bermudagrass was significancly reduced when the number of tall fescue were more. It is disadvantage for bermudagrass to regrowth next year. As the result,the turf quality and turf colour and green cover were seriously affected in summer.2. Overseeding date should be in the middle or last ten days of Oct. Earlier overseeding date could not only establish overseeding turf before winter and prolong turf green period, but also make tall fescue plant stronger and improve turf quality and turf colour and turf green cover during turfgrass returning next year, overseeding on the fifth of Nov couldn’t establish overseeding turf though high seeding rate,for the reason that tall fescue couldn’t completely germinate and grow. And so on, high seeding rate could reduce turfgrass growth and turf visual character.3. The height of cutting should be low after overseeding with tall fescue. The bermudagrass’s density and turf density of the treatment of cutting height of 3cm were more than that of cutting height of 4cm or 5 cm. The turf visual character of the treatment of cutting height of 3 cm were better than that of cutting height of 4cm or 5cm in summer. It was also showed in trial of competetion. The bermudagrass’s competetion the treatment of cutting height of 3 cm were more than that of cutting height of 4cm or 5cm, in the condition that the number of tall fescue’s planting was lower. So it was propitious for bermudagrass to regrowth.更多还原