Effects Of Fragmental Habitat On Biodiversity Of Evergreen Broadleaved Forest In Jinyun Mountain

The plant communities were surveyed, and the microclimates were observed, and the soil fertilities were determined in Jinyun Mountain in a series of fragmental evergreen broadleaved forests with different size and slope aspect, in comp" is n with continuous evergreen broadleaved forest. The following contents were mainly studied: (1) Aspect , structure as well as characteristic of species composition between fragmental evergreen broadleaved forests and continuous evergreen broadleaved forest; (2) Species diversity, species abundance and species evenness between fragmental evergreen broadleaved forests and contin ..us evergreen broadleaved forest; (3) Plant floristic compositions at family and genus levels between fragmental evergreen broadleaved forests and continuous evergreen broadleaved forest; (4) Life form between fragmental evergreen broadleaved forests and continuous evergreen broadleaved forest; (5) Microclimate factor (sun radiation, temperature, wind velocity, humidity) in different level pattern (open, edge and interior) between fragmental evergreen broadleaved forests and continuous evergreen broadleaved forest; (6) The relations between environment and soil factors as well as species diversity of forest community between fragmental evergreen broadleaved forests and continuous evergreen broadleaved forest.The result of experiment showed that:(1) The aspect of fragmental evergreen broadleaved forests is the same as that of continuous evergreen broadleaved forest on the whole. Every fragmental evergreen broadleaved forest is divided three sublayer, however, their structure of layers are not dear, some fragmentations with less areas, are not integral, such as Yuanxiao peak. There are less plants in the first sublayer. The close canopy of fragmental evergreen broadleaved forest community is less than the one of continuous evergreen broadleaved forest, and the plant species of fragmental evergreen broadleaved forest community are also less than those of continuous evergreen broadleaved forest, and there are some conifers in the fragmental evergreen broadleaved forests. Species compositions of evergreen element in the fragmental evergreen broadleaved forests are less rich and conifers are more than those in the continuous evergreen broadleaved forest. The plant species of shrub in the fragmental evergreen broadleaved forests are less rich than those in the continuous evergreen broadleaved forest. Some of these fragmentations have more rich grass quantity at the forest fringe and less rich grass numbers at the forest interior. The grass species are the same as the grass quantities, some species of extensive distribution especially are this case. Some fragmentations with less area have less moss in species kind and quantity, whereas they have more rich lianas not only in species but also in number.(2) In general, in comparison with continuous evergreen broadleaved forest, these fragmentation forest have smaller species diversity index, and different life forms have different represents. Diversity index of tree layer decrease with the increase of mankind disturbance, however, the diversity index ofFuxingshi is less than comparison plot, it is likely that there are some history reasons, or the quantities of potential settlers are less, and it is far from species source plot or there are some interactions between these species in the communities. The index of diversity of grass is larger in Fuxingsi, Juyunfeng and Yuanxiaofeng than that of continuous evergreen broadleaved forest, however, it is smaller in other fragmental evergreen broadleaved forests.(3) There is not clear different in geographic composition of plant floristic family between continuous and fragmental evergreen broadleaved forests. In generic geographic composition, The proportions of Pantropic distribution and Tropic Asia to Tropic Africa distribution are relatively increased, however, Tropic Asia distribution is relatively decreased.(4) The proportion of the Mesophanerophyte decreased, The proportions of the Microp...