摘要 : Establishment of a forest watershed using bioengineering conservation measures resulted in gradual decrease in soil loss from 37 Mg ha^-1 yr^-1 to just 1.0 Mg ha^-1 yr^-1 during the period 1... 展开 Establishment of a forest watershed using bioengineering conservation measures resulted in gradual decrease in soil loss from 37 Mg ha^-1 yr^-1 to just 1.0 Mg ha^-1 yr^-1 during the period 1964 to 1985. This reducing trend however reversed after the invasion and proliferation of <i>Lantana camara</i> causing a change in vegetation during the period 1990-2000. <i>Lantana camara</i> and <i>Murraya koenigii</i> became the most dominant plants with highest Importance Value Index (IVI), while many native shrubs like <i>Nyctanthes abortristis</i>, <i>Adhatoda vasica</i>, <i>Carissa opaca</i> and <i>Rubus biflorus</i> drastically declined during this period. <i>L. camara</i> attained the highest biomass, causing drastic reduction in the grass biomass. The IVI of <i>Acacia catechu</i> and <i>Caesalpinia sepiaria</i> increased, while that of <i>Dalbergia sissoo</i>, <i>Acacia nilotica</i>, and <i>Acacia modesta</i> decreased. There was a reduction in evenness index and Shannon index of diversity, while the Simpson index of dominance has increased during this period. The native vegetation like <i>Randia dumatorum</i>, <i>Grewia optiva</i>, and <i>Acacia ieucophloea</i> showed a negative inter-specific interaction with <i>L. camara</i>. 收起