Impact of anthropogenic disturbance on species diversity and vegetation structure of a low

Impact of anthropogenic disturbance on species diversity and vegetation structure of a lowland tropical rainforest of eastern Himalaya, India

Anudip GOGOI;Uttam Kumar SAHOO

【期刊名称】《山地科学学报（英文版）》 【年(卷),期】2018(015)011

【摘要】Impact of anthropogenic disturbance on species diversity and vegetation structure of a lowland tropical rainforest was studied in the foothills of Eastern Himalaya,India.Tree species richness,density,basal area and the diversity indices were found significantly (P＜0.05) decreased with the increasing level of disturbances whereas,shrub density,basal area and herb density significantly increased with increasing disturbance level.In ease of shrubs,Simpson's dominance index significantly (P＜0.007) increased along the disturbance gradient,whereas Pielou's evenness index significantly (P＜0.005) decreased with an increasing level of disturbance.Shannon-Weiner diversity index for herbs significantly (P＜0.016) increased with increasing disturbance whereas,Simpson's dominance index was significantly (P＜0.013) declined along the disturbance gradient.Results revealed that 10-50 cm dbh classes constituted the highest stem density,and highest basal area was recorded in the ＞100 cm dbh class in all three sites.Density of the matured trees decreased with increasing