关键词: 雾灵山, 落叶阔叶林, 采伐迹地, 物种多样性, 种群动态, 非点源污染, 胡家山小流域, 输出系数法, 实测数据, 坡度

Abstract: Based on five years consecutive located observations at permanent plots, the species diversity, community evenness and population dynamics of regenerated seedlings,herbs and shrubs before and after clearcutting of the deciduous broad leaved forest at Wuling Mountain were studied by using Shannon Wienner's species diversity index and the evenness index. The species diversity and evenness indexes of tree seedlings on the slash were higher in4 years after cutting than before cutting, Populus davidiana not existed in the uncut forest stands quickly propagated, while Pinus tabulaeformis existed in the uncut forest stands was absent on the slash. The species diversity and evenness indexes of shrubs increased on the slash. Weigela florida and Lespedeza bicolor were the dominant species. Rubus crataegifolius, which was not dominant at the beginning,increased rapidly in the later period, and became dominant on the slash. The species diversity and evenness indexes of herbs peaked in the third year, and began to decrease in the fourth year. The herbaceous plants were classified into 8 types, based on their population dynamics before and after forest cutting. The light demanding species developed well, and the shade enduring species gradually disappeared,which were the obvious characteristics for herbaceous populations.

Key words: Wuling Mountain, Deciduous broad-leaved forest, Cutting slash, Species diversity, Population dynamics, export coefficient method, slope gradient, non-point source pollution, Hujiashan small watershed, measured data