Studies on biomass of Spiraea pubescens shrub in the north region of Yanshan mountain

Spiraea pubescens shrub is of a common degraded ecosystem in the north region of Yanshan mountain.A study was conducted on the aboveground biomass of Spiraea pubescens shrub in order to understand the growth situation of Spiraea pubescens shrub.The results showed that the aboveground biomass of Spiraea pubescens shrub decreased along the environmental gradients of downslope-midslope-upslope.The total biomass of Spiraea pubescens shrub of lowslope,midslope,and upslope was 577.31,469.78 and 208.53 g/m2,respectively.The Corylus heterophylla shrub distributed in Spiraea pubescens shrub also had a similar distribution trend,but the biomass of Corylus heterophylla shrub was significantly higher than that of Spiraea pubescens shrub.The biomass of herb in Spiraea pubescens shrub also decreased along the slope,ranging from 118.92 g/m2 to 276.72 g/m2.The biomass of Spiraea pubescens shrub in this region is lower than that of any other type of shrub in the northern region.In conclusion,the biomass of Spiraea pubescens shrub is closely related to the terrain conditions,and the biomass of Spiraea pubescens shrub is in a low level due to long-term disturbance.