Study On Forest Fire On Understory Vegetation Diversity And Biomass Of Larix Gmelinii Burned Area

In this study,the spatial sequence was used instead of the time series on the method.The research objects were the Xing'an Larix gmelinii forests affected by wildfire in Yakeshi.The plant diversity measurement method and harvesting method were used to study the fire intensity and recovery period respectively.To study the effects of fire intensity and recovery years on forest species diversity and forest biomass,and the relationship between forest species diversity and stand biomass.we can get the following conclusions:Under the disturbance of different intensity wildfires,for the species diversity of shrubs,mild wildfires will increase the species diversity.While the wildfire intensity is moderate or severe,shrub species diversity will decrease.The intensity of wildfire had a great influence on the Margalef index of the herb,and the Margalef index of the herb reached a peak after moderate wildfire.The biomass of the tree was significantly negatively correlated with the intensity of the forest wildfire,and the moderate and severe wildfire were significantly reduced.After mild wildfires,moderate wildfires,and severe wildfires,the shrub biomass increased that compared with the unfired area.Wildfires increase the biomass of the shrub,.and the increasing biomass of the shrub is most pronounced after moderate fire.After the wildfire on the herb,the biomass of the herb decreased that compared with the unfired area,.The biomass of the herb had increased after severe fire.As the recovery period increases,the Shannon-winner diversity index and Margalef index of the shrub gradually decrease.Herb diversity varies with fire intensity.After mild fire,the species diversity of herb gradually increases with the recovery period.On the moderately and severely burned area,the Shannon-winner index of the herb decreased with the recovery period.The recovery period has little effect on the aboveground biomass of the tree.The aboveground biomass of shrub decreased with the increase of recovery years.As the recovery period increases,the aboveground biomass of herb increased firstly,and then decreased.With the increasing of Margalef index of the tree There is a positive correlation between shrub species diversity and its aboveground biomass.There is no significant correlation between herb species diversity and biomass.