武陵山区小流域植被恢复群落组成与地理成分

对武陵山区女儿寨侵蚀小流域植被恢复群落科属组成及属的地理成分进行了分析.结果表明:维管植物种类较为丰富,隶属于89科178属221种,群落优势科趋于明显,含5种以上的科虽只占总科数的16.85%(15科),却占总属、种数的44.57%、52.04%,属内种数的变化范围为1~4,以单种属最多(148属,82.29%);蕨类植物具有明显的热带成分(15属,占65.22%),种子植物区系地理成分复杂,具有丰富的热带性质(65属,42.75%)和明显的温带成分(73属,48.04%),在区系分区上处于从亚热带至温带之间的过渡地带.研究结果可为小流域及区域性植被恢复与重建提供参考.

Vegetation Restoration Communities in the Soil Erosion Watershed of Wuling Mountain Region:Their Family and Genera Composition and Geographic Element Analysis

An analytical study was made of the family and genera composition and the geographic elements of the different vegetation restoration communities in the soil erosion watershed named Nuerzhai in Wuling Mountain Region.Field survey indicates that the communities are rich in species diversity,with 89 families of vascular plants including 178 genera and 221 species;that althrough the percentage of families which have over 5 species is only 16.85(15 families),its percentages of genera and species are 44.57 and 52.04 respectively,which shows an obvious advantage of dominant families in the communities;that as for the species number in genera,it varies from 1 to 4 and single-species genera is of the largest number;that in pteridophyte flora,the tropic areal type has the majority of genera(15 genera,65.22%);and that the complex geographic elements of seed plant flora bear a rich tropic areal type(65 genera,42.75%) and some obvious temperate characteristics(73 genera,48.04%),which shows that a transition of seed plant flora from sub-tropic zone to temperate zone.These results offer some references to the vegetation restoration in Nuerzhai watershed and in some other similar vulnerable eco-districts in Wuling Mountain Region.