Research Of The Plant Community Diversity In Periglacial Landform Of Mt. Laotudingzi In Liaoning Eastern Mountains

The species diversity can reflect the stability of composition and structure of the plant community. Research on the species diversity is an important part of ecology research. There are good plant communities on periglacial landform of Mt. Laotudingzi in Liaoning Eastern Mountains, and the rich plant species, distribution of the plant community is hlepfull to stabilize of the very fragile environment and playing an important role on conformity. Thinking about these reasons, this study takes the plant community of periglacial landform of Mt. Laotudingzi as the study area. based on 48 sample area's(including 39 arbor quadrats, 192 bush quadrats and 240 herbal quadrats) community survey datum, classify community types scientifically, and determine patterns of plant on periglacial landform of Mt. Laotudingzi.Select species richness index and ? diversity index quantitative investigating species diversity and differential characteristics of it of the plantcommunity in rock stream, rock block field and rock glacier slope of Mt. Laotudingzi in Liaoning Eastern Mountains, furthermore analysis the affecting factors of species diversity. The analysis results shows:(1) 48 associations of Periglacial Landform of Mt. Laotudingzi can be divided into 16 forest formations, 6 bushy formations, merging as broadleaved deciduous forest, theropencedrymion, dark coniferous forest, elfin forest, bushwood, meadow thicket, 6 vegetation types.(2) On landform of rock stream the mainly fosters are theropencedrymion(50%) and broadleaved deciduous forest(42%); On rock block field the mainly fosters are bushwood(43%) and meadow thicket(29%); On landform of rock glacier side the mainly fosters are theropencedrymion(47%), broadleaved deciduous forest(23.5%) and bushwood(23.5%).(3) On landform of rock stream species richness index of plant community, tree layer, shrub layer and herb layers are respectively 22~58, 3~17, 9~20, 5~26; On rock block field species richness index of plant community, tree layer, shrub layer and herb layers are respectively 27~52, 0~6, 6~14, 12~38; On landform of rock glacier side species richness index of plant community, tree layer, shrub layer and herb layers are respectively 23~52, 0~11, 6~13, 8~28. And species richness index has no significant differences among 3 types of periglacial landform.(4) On landform of rock stream Shannon-wiener index and Simpson index of plant community, tree layer, shrub layer and herb layer are respectively 0.87~2.06, 0.73~2.60, 0.93~1.89, 0.13~1.89; 0.48~0.83, 0.40~0.91, 0.54~0.82, 0.09~0.83; On rock block field Shannon-wiener index and Simpson index of plant community, tree layer, shrub layer and herb layer are respectively 0.77~1.45, 0~1.38, 0.82~1.78, 1.62~2.58; 0.34~0.72, 0~0.68, 0.45~0.78, 0.73~0.90; On landform of rock glacier side Shannon-wiener index and Simpson index of plant community, tree layer, shrub layer and herb layers are respectively 0.85~1.99, 0~2.10, 0.82~1.62, 0.55~2.57; 0.35~0.83, 0~0.85, 0.48~0.78, 0.33~0.91. And ? diversity index also has no significant differences among 3 types of periglacial landform.(5) The correlation analysis result shows that vegetation type, plant community, slope, slope-aspect and altitude has affect plant species diversity index to varying degree. And the elevation plays the most important role for changing of diversity index. The value of diversity index of shrub layer is least sensitive to the elevation.