Studies On Biodiversity And The Flora Of The Seed Plants From Baishuihe Nature Reserve In Pengzhou

We have collected the specimens and gotten the biodiversity datas of BaiShuihe Nature Reserve in Peng Zhou, analysed the datas, the results as follows:1. Diversity of the plant community along altitudinal gradient1.1αdiversity of the plant communities along altitudinal gradientFrom 1400m to 3900m at Baishuihe Nature Reserve, 52 plots were investigatedwith an interval 100m in altitude:αdiversity andβdiversity of plant communitiesand their variety along altitudinal gradient were studied. The results showed that indifferent successional layers of trees, richness and diversity decreased linearly withthe increase of altitude. But shrub and herb layers don't decrease linearly with theincrease of altitude. Tree species decreased from 15 species at 1400m so only 2species at timberline. Shrub and herb species decreased from 35 and 38 species at2000m to 5 and 20 species at 3800m respectively. Tree species are replacedobviously with the increase of altitude; It shows that altitude includes manyenvironmental facts, which infect the distribution, structure and diversity of plantpopulation.1.2 The variety ofβdiversity along altitudinal gradient.The entironment changed obviously near 2200m according to our research. Forsimilarity(CJ) between neighboring plots above 2200m is larger than with below it.It shows that below 2200m, the neighboring plots has more same species, and thehabitats of neighboring plots has more similarity. Above 2200 is the other wayround. The plant communites have higher species richness and species turnoverlargestly between neighboring plots because of the disturbance from humanity at lowaltitude. Between 2800m and 3200m species turnover not so obviously because ofmore Rhododendron live there.We should think over species and the types of plant communities effect thevariety ofβdiversity along altitude gradient. Use more biodiversity indexs and fromseveral aspects to understand the variety ofβdiversity along altitudinal gradient.2. Origin and characteristic features of Bai Shuihe Nature Reserve990 species of wild seed plants (belonging to 421 generas in 138 families) inthe floristic region of Bai Shuihe Nature Reserve were reported here. The statisticsand comparatively intensive analysis at generic and familiar levelss. Based on thestatistics, the results show that both temperate and tropical distribution types areacounted for considerable proportion of the total, but formal is a little moreimportant than the later. The North Temperate and E.Asia-N.America disjunctedpatterns are more concentrated in this area. These may be considered as thecharacteristic features of Bai Shuihe Nature Reserve flora, while many of them arearchaic and relic elements. According to above data, the floristic region of BaiShuihe Nature Reserve may be considered as a typical region in Chinese flora. Also,the flora of Bai Shuihe Nature Reserve are originated since ancient time as a wellconserved Arctic-Tertiar flora.