摘要
通过对青海湖地区线叶嵩草型中度与重度退化草地群落的比较研究,结果表明,在中度到重度退化进程中,随着退化程度的加重,草地植物群落的盖度、物种数、多样性及均匀度指数均下降,中度与重度退化样地地上植物类群及总植物量季节动态均呈现明显的“单峰”曲线,其峰值同时出现在8月下旬,在植物生长季,主要植物类群地上植物量季节动态具有明显的差异。地上总植物量季节积累动态均可用曲线y=ea+bx(生长曲线)很好拟合。中度退化样地的净初级生产力高于重度退化样地,但由于在牧草返青期放牧使中度退化样地禾草类在草群中所占的比例小于重度退化样地。
Moderate and heavy degraded communities of Kobresia capillifolia grassland in Qinghai Lake area were compared in this paper. The result showed that the coverage, the number of species, the species diversity and evenness index of plant community decreased with the aggravation Of degradation. Seasonal dynamic of aboveground populations and total biomass of two degraded plots take on single apex curve, the value of apex appeared in the last ten days of August. Significant difference was observed in total aboveground biomass between two degraded plots. The accumulation dynamics of aboveground biomass could be simulated by the equation y=e^a＋br. The net production of aboveground biomass of moderate-degraded plot was higher than that of heavy-degraded plot. The percentage of grasses in moderate degraded plol was lower than heavy-degraded plot because of grazing in early spring.
出处
《草业科学》
CAS
CSCD
2006年第10期8-13,共6页
Pratacultural Science
基金
中国农科院兰州畜牧与兽药研究所课题
青藏高原生态畜牧业试验与示范课题
关键词
青海湖地区
线叶嵩草
退化
群落
Qinghai Lake area
Kobresia capillifolia
degradation
community
作者简介
王小利（1977-），男，甘肃镇原人，硕士。
