Effects Of Grassland Management Measures On Poisonous Plants In Alpine Meadow

In order to verify effects of different management measures on species composition, species diversity, functional traits and above-ground biomass of poisonous plants in alpine meadow, the natural grassland were imposed with sward ripping, reseeding, fertilization and grazing. The results showed that:1. A total28poisonous species were recorded in the study area, which belonging to8families. Among which, the largest number of species was in Ranunculaceac, as many as8, followed by Legurninosae and Scrophulariaceae, the least one was in Umbelliferae, only1.2. The species number, dominance and Shannon-Wiener index of poisonous plants was reduced significantly by different management measures. Especially for reseeding treatment, the species number of poisonous plants was lowest (19), and the predominant value was less than10%. In addition, as the species diversity of poisonous plant reduced, the species diversity of community was decreased simultaneously.3. Management measures, had a significantly influence on functional traits of poisonous plants. The plant height of poisonous species was significantly reduced by different treatments. The specific leaf area and leaf dry matter content of poisonous plants was increased by fertilization and grazing respectively, and the stem-leaf ratio was greatly increased by sward ripping. The relative growth rate of poisonous plants, however, was not affected by management measures. and the relative growth rate at a low level in all of sample plots. The relative growth rate of poisonous plant in all treatments was in relative low level.4. The above-ground biomass of poisonous plants was increased differently in the grazing and sward ripping treatments. In reseeding and fertilization treatments, however, the above-ground biomass of poisonous plants decrease significantly. The order of above-ground biomass of poisonous plants in each treatments was reseeding (78.44g.m-2)<fertilization (112.48g·m-2)<control (144.32g·m-2)<sward ripping (158.24g·m-2)<grazing (201.91g·m-2).These results indicated that management measures has significant influence on species composition, species diversity, functional traits and above-ground biomass of poisonous plants in alpine meadow. The Elymus-dominated community formed by reseeding treatment made species number, plant height, species diversity and above-ground biomass of poisonous plants decreased significantly. Thus, reseeding treatment could be regarded as one of the optimal measures for restoration of poisonous plants-dominated degraded grassland.