丝茅草坪冬季交播小苜蓿的生长规律及草坪质量评价

针对丝茅草坪冬季枯黄及地上茎叶凋零影响坪用价值的问题,通过交播小苜蓿后,从11月到翌年5月,连续测定草坪群落组成、高度、盖度、密度及草坪品质变化,分析补播小苜蓿对丝茅返青、生长及景观价值的影响,探讨补播改良丝茅草坪的可行性。结果表明:丝茅与小苜蓿物候期互补适合交播,小苜蓿自播能力极强,一次播种可多年利用;交播对草坪群落组成、高度、密度和质地均有极显著影响(P0.01);丝茅1~3月几近死亡,小苜蓿发挥建群种作用;4月丝茅返青,小苜蓿开花结果后逐渐死亡;虽密度、颜色、质地、均一性最大值出现的月份不同,交播后草坪在整个冬季维持了较高的品质,实现了草坪四季常绿的景观效果。

Growth rule and turf quality evaluation of Imperata koenigii lawn after overseeding Medicago minima in the winter

Aiming at the problem of Imperata koenigii lawn becoming yellow and stem and leave withering in winter,I .koenigii lawn was overseeded with Medicago minima after trimming 5 cm stubble height in mid-October.From November to May next year,the indexes,including community composition,height,coverage, density and quality,were measured.The objective was to analyze the effect of overseeding Medicago minima on reviving,growth and appearance value of I .koenigii lawn and to explore the feasibility of improving I .koenigii lawn by overseeding.The results showed that the phenophase of I .koenigii and Medicago minima was comple-mentary,thus Medicago minima was suitable for overseeding in I .koenigii lawn.Medicago minima can be used many years once planted because of its strong self-reproduction ability.Overseeding had a significant effect on community composition,height,density and texture (P <0.01 ).When I .koenigii almost dies from January to March,Medicago minima plays a role of dominant species.When I .koenigii revives in April,Medicago minima gradually flowers and then dies.Although the maximum of density,color,texture and homogeneity appeared in different month,I .koenigii lawn after overseeding Medicago minima maintains a high quality in winter,which achieves evergreen in four seasons.