不同利用方式天然草原地上植被特征变化研究

以不同类型天然草原为研究对象，研究禁牧封育、冷季放牧和常年放牧三种利用方式对地上生物量和物种丰富度的影响。结果表明：常年放牧显著降低了高寒草甸和温性草原地上生物量（P＜0.05），且禁牧和冷季放牧之间差异不显著（P＜0.05），冷季放牧显著降低了温性荒漠草原地上生物量（P＜0.05）；禁牧高寒草甸和温性草原物种丰富度显著低于常年放牧（P＜0.05），禁牧和冷季放牧对温性荒漠草原物种丰富度无显著影响（P＜0.05）。

Study on the Variation of Aboveground Vegetation Characteristics of Natural Grassland under Different Utilization Modes

In this study, different types of natural grasslands were used as the research object, and the effects of three utilization modes of grazing prohibition and enclosure, cool season grazing and perennial grazing on aboveground biomass and species richness were studied. The results showed that perennial grazing significantly reduced the aboveground biomass of alpine meadow and temperate steppe (P< 0.05), and there was no significant difference between grazing prohibition and cool season grazing (P< 0.05). Cool season grazing significantly reduced aboveground biomass in temperate desert steppe (P< 0.05). The species richness of alpine meadows and temperate steppes prohibited from grazing was significantly lower than that of perennial grazing (P< 0.05). Grazing prohibition and cool season grazing had no significant effect on the species richness of the temperate desert steppe (P< 0.05).