摘要
研究了玛曲高寒沙化草地植物群落特征,探讨补播禾草对物种多样性和植物量的影响。结果表明,补播第2年各处理的重要值均以异针茅为最大,说明补播没有使异针茅的优势地位受到太大影响,异针茅为玛曲当前高寒沙化草地的优势种,乳浆大戟生态位宽度最大,为0.992,生态位重叠最大发生在紫羊茅和异针茅,以及紫羊茅和乳浆大戟之间,为0.997。补播后随着禾草种类数量的增加,能提高高寒草地的质量,是提高退化高寒草地生产力的有效手段。
The characteristics of niche and niche overlap of 20 species and the effects of interseeding grass on productivity in Maqu alpine desertified meadow was studied. The result indicated that the dominant species was Stipa aliena. The largest niche species, with important value 0. 992, was Enphorbia esula. The species with largest overlap value was between Festuca rubra and Stipa aliena or between Festuca rubra and Euphorbia esula, which was 0. 997. Interseeding increased species richness and grass groups density significantly. The density added 39.65 % by mixed interseeding Festuca sinensis and Elymus nutans. Above-ground biomass also significant in- creased compared to control after interseeding. And above-ground biomass of mixed interseeding Elymus nutans, Festuca sinensis keng and Poa pratensis increased 55.74%. Grasses accounted for the total biomass of more than 50%. Therefore,interseeding grasses could improve the meadow quality ; increase the productivity in degradation alpine meadow,which can widely generalize in degraded alpine meadow.
出处
《草原与草坪》
CAS
2009年第4期20-24,27,共6页
Grassland and Turf
基金
甘肃省科技攻关项目"黄河首曲玛曲县退化草地改良模式与综合生产力提高途径研究"项目编号:(2GS052-A41-007-03)资助
关键词
高寒沙化草地
补播禾草
生态位
alpine desertified meadow
niche
interseeding grasses
plant diversity
productivity
