摘要
针对黄土丘陵区草地植被退化严重，草食牧业发展低而不稳，优良牧草愈来愈少等现状，进行了草地施肥与封育试验，研究草地植被群落的结构与演替过程。结果表明：施肥与封育后草地群落种类组成数量差异显著，建群种个体数量变化较大，生物产量高，群落演替速度快。不同施肥量随着时间变化的延续，长芒草群落种类组成和建群种的变化从低施肥区到高施肥区，成较快上升趋势，百里香群落成缓慢上升趋势。生物量的变化中施肥区高于高施肥区和低施肥区。通过施肥封育后干草原类型区群落演替阶段为：定居→恢复→竞争→稳定群落。各群落的演替在干草原类型中，最终形成为以长芒草为主的群落类型。
Dealed with the degeneration of vegetation of grassland and the undevelopment of grass feeded stock raising,and along with the fine sorts of grass was less and less in loess hilly area,the author conducted a fertilizering and seeling experiment aimed at studying the structure and succession of vegetation community. The results showed that the fertilizered and seeled grass land have appeared greatly differience in composition of numbers and sorts of the community.The establishment sorts of Stipa bungeana community have more change than Thymus mong olicus community by fertilizered and seeled along with time stretch in the sorts of numbers and biomass high,and succession speed.The retional amount of fertilizer and were between the high and the low level of input.Though experiment the steps of succession by fertilizered and seeled in dry grass land area as follows:seted in-rehabilitation w competition-steady community.The finality is acommunity maily contributed by S.bungeana.
出处
《水土保持研究》
CSCD
1996年第4期124-128,共5页
Research of Soil and Water Conservation
基金
中国科学院院长基金
关键词
施肥
草地群落
结构和演替
fertilization grass land community structure and succession
