Effect of Management Patterns on Community Structure and Species Diversity of Subalpine Meadow of the Southern Margin of Tibetan Plateau
In order to explore the suitable management patterns of subalpine meadow of the southern margin of Tibetan Plateau, the free grazing plot, 4 years of seasonal fencing plot, 4 years of totally fencing plot and 20 years of seasonal fencing and mowing plot of subalpine meadow were selected, and the community structure and species diversity were measured in this study.The results showed that the community productivity, density and coverage of subalpine meadow had no significant changes;the dominant position of harmful species decreased, and the dominant position of excellent forages increased in contrary;the species richness index decreased, and the diversity index and evenness index had no significant changes after 4 years of seasonal fencing.After 4 years of totally fencing, the community productivity, density, coverage,and the dominance of excellent forages increased significantly;the ecological dominance index increased,and the richness index, diversity index and evenness index decreased significantly because the community was just dominated by one species (Poa pratensis) after 4 years of totally fencing.After 20 years of fencing and mowing, the community productivity, density, coverage and the dominance of excellent forages increased significantly, the ecological dominance index and richness index increased sharply, and the diversity index and evenness index decreased in contrary because the community was just dominated by two species (Poa pratensis and Kobresia macrantha) after 20 years of fencing and mowing.Therefore, compared with free grazing, three fencing measurement increased the dominant position of excellent forages, and improved the plant restoration of subalpine meadow.But because the dominant position of one or few species increased significantly and the concomitant species disappeared, the species richness and diversity decreased subsequently.
NETL
NSTL
万方数据
维普
