Plant Community Diversity In Bao Tianman National Reserve, Henan Province

Plant community diversity of Bao Tianman national reserve, Henan Province, was studied comprehensively in terms of flora characteristics, quantitative classification and ordination of plant communities, plant species diversity , the relationships between plant species diversity and plant growth form and altitude, interspecific association and niche, changes of plant species diversity along with the restoration processes of Quercus variabilis forest. The results are as follows:1. Flora is plentiful, complicate and with a long history. There are 150 families, 783 genera, 2147 species(including infraspecific taxon) of seed plants. According to the genera of seed plants belong to 15 types and 18 subtypes were identified. The flora has distinct both warm temperate characteristics and transitional characteristics from deciduous broad-leaved forest to evergreen broad-leaved forest, and temperate genera account for 61.10% in total genera. It has 30 genera endemic to China and 30 national class rare and endangered species. 2. Plant communities were classified into 23 formations by Two-Way INdicators SPecies ANalysis ( TWINSPAN ) , they are Form. Quercus acrodenta, Form. Carpinus cordata. Form. Ostrya japonica+Kalopanax septemlobus, Form. Q. variabilis+ Platycarya strobilacea, Form. Q. variabilis, Form. Q. variabilis+ Castanea seguinii, Form. C. seguinii, Form. Q. aliena var. acuteserrata +P. strobilacea, Form. Q. glandulifera var. brevipetiolata+Q. aliena var. acuteserrata, Form. Poplus davidiana+ Betula platyphylla, Form. Q. aliena var. acuteserrata, Form. P. strobilacea+Toxicodendron verniciflnum+Acer davidii, Form. Q. glauc'a, Form. Rhododendron purdomii, Form. A. robustum+Fraxinus mandshurica, Form. Macrocarpium officinalis, Form. Koelreuteria paniculata, Form. Catalpa ovata+Pterocarya stenoptera , Form. A. oblongum, Form. Pteroceltis tatarinowii. Form. Vitex negundo, Form. Dipteronia sinensis+Tapiscia sinensis and Form. Euptelea pleiospermum. Results of ordination by Detrended Correspondence Analysis (DCA) reflect basically- the relationship between plant communities and environmental factors, axis 1 and axis 2 reflect mainly the thermal and moisture gradients respectively.3. Distribution trends of species richness index, species diversity index and species evenness index along the community gradient are almost the same, they reflect the differences of species composition of different plant communities. Species richness index of herb layer is...