北过渡带结缕草交播多年生黑麦草的竞争研究

选择北过渡带地区有代表性的城市西安，通过观测2008年3-11月期间中华结缕草Zoysia sinica与多年生黑麦草Lolium perenne的盖度和密度的动态变化，研究交播复合群落在共生时间序列上的种群间的竞争。试验期间交播复合群落的群落格局发生2次变化，3-6月结缕草逐渐取代多年生黑麦草成为群落优势种，进入9月多年生黑麦草盖度与密度逐渐增加，再次成为主要草种。试验表明，多年生黑麦草品种匹克与百舸均为合适交播品种；3.5 g/m2的交播量达到了交播草坪要求；交播复合群落的竞争主要受草坪草遗传特性与外部环境的影响，其中温度因子起关键作用；高频率的低修剪改变了草坪群落的光照和遮蔽条件，对草坪草的竞争力产生了强烈的影响。

Study on competition between zoysia and over-seeded perennial ryegrass in north transitional climatic zone

The competition between zoysia and over-seeded perennial ryegrass was studied in Xi'an,a representative city in north transitional climatic zone,from April to May in 2008 through observing the dynamic change of coverage and density of zoysia and perennial ryegrass.The results indicated that the community pattern of overseeding compound community changed in 2 periods.From April to June,zoysia replaced perennial ryegrass and became the dominant species gradually.After September,the coverage and density of per...