A study on the conservation of biological diversity of the lucidophyllous forest

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1 Species-area relationship in the fragmented lucidophyllous forestsThe relationship between the number of component species of lucidophyllous forest and forest area was analyzed. The results show that the log species-log area model describes the species-area relationship in three regions better than the species-log area model.2 Flora of the lucidophyllous forest in JapanFloristic investigation of the lucidophyllous forest throughout Japan was conducted. The flora of the lucidophyllous forest throughout Japan consists of 1,008 species. About 30 percent of the total numbers of component species are endangered.3 Species richness in the gap phase of lucidophyllous forestIn the gap phase, the species richness of all occurring species per 100 m^2 and that of component species, except for epiphytes, were higher than those in the mature phase. Canopy gaps play an important role in the maintenance of species richness as well as the process of lucidophyllous forest regeneration.4 Species richness of lucidophyllous forest along the environmental conditionsSpecies richness (number of species per 225 m^2) along the micro-scale geomorphic units (foot slope, lower sideslope, upper sideslope, crest slope and rocky site) ranged from 62.6 to 44.0, and foot slope had the highest species richness. On foot slope, high species richness seemed to be due to high values of minimum air capacity.Species richness (number of species per 225 m^2) along the altitudinal gradient ranged from 30 to 68 and decreased abruptly from low to high altitude.