高寒牧区初建多年生禾草人工草地杂草群落特性的研究

Characteristics of Weed Community of Preliminary Established Artificial Grassland of Perennial Grass in Alpine Region

对高寒牧区人工多年生禾草草地建植第一年杂草群落特性进行的研究结果表明 ,该区禾草人工草地杂草种类组成较为简单 (13种均为阔叶杂草 ) ,但危害很大 ,其中灰绿藜、萼果香薷、微孔草等不但生长旺盛 ,与禾草共生同期生长 ,且密度和盖度大 ,频度高 ,为该草地群落的优势杂草种。通过计算SDR4 值 ,该人工草地群落为 :灰绿藜 -萼果香薷 -禾草 ,即杂草为主的群落 ,故必须进行杂草的防除 ,否则人工草地建植失败。此外 。

Studies on the characteristics of weed community on the preliminarily established artificial grassland of perennial grass were carried out in alpine region. The results show that the serious damage can be occured to the target artificial grassland although the composition of weed community is simple. Chenopodium glaucum, Elshotzia calycocarpa, Microula sikkimensis are major species, which grow thriftily, posses high density, coverage and frequency and have long co existing period with target grass. The community can be defined as Chenopodium glaucum Elshotzia calycocarpa grass community by calculating its SDR 4 (Summed dominance ratio), the weeds are dominate species in the community. It is urged that the action of weed control must be taken to successfully establish the artificial grassland of perennial grass in this region. Moreover, the suggestions on weed control are forwarded in this paper.