Dynamics of population and biomass at early natural recovery stage of vegetation on abandoned quarry of Tiantong National Forest Park

The study shows that the species composition of the community on the abandoned quarry was very simple, with only two species, Schima superba and Pinus massoniana. The trends of density dynamics of the two populations were up first and then down, with the highest densities at three and four years old, respectively. The aboveground growth of P. massoniana was faster than S. superba, and its total biomass was 12 times more. The proportion of biomass in leaves and roots of S. superba was higher, while in stems was lower than P. massoniana. It is suggested that by fast growing, P. massoniana was dominant in competition at early succession stage on the abandoned quarry. The characters of communities at the early succession stage were also compared between the quarry site and the clear-cutting site, and the effective recovery of vegetation was discussed in this paper.