Study on fine root biomass and its distribution characteristics in different subtropical forests,China
Fine roots are important organs for plants to absorb water and nutrients,and are great significance for the maintenance and development of forest ecosystems.However,there are few studies focusing on the biomass and distribution characteristics of fine roots of forests communities in different succession stages,especially for the natural forests and forests types formed by different restoration measures after clear cutting.Based on soil drilling method,fine root biomass and its distribution characteristics of 0-30 cm soil layer in typical subtropical theropencedrymion forests(artificial forests),subtropical evergreen broad-leaved forest(secondary forests)and subtropical evergreen broad-leaved forest(natural forests)were studied.The results are as follows.(1)Fine root biomass of natural forests(176.98 g·m-2)was significantly higher than that of the secondary forests(99.88 g·m-2)and artificial forests(94.35 g·m-2)(p<0.05).(2)0-15 cm soil layer was the main distribution area of fine root in all forests types,and accounted for more than 70%of the total fine root biomass of 0-30 cm soil layer.In the same forest types,fine root biomass in 0-15 cm soil layer was significantly higher than that in 15-30 cm soil layer.In the same soil layer,fine root biomass of natural forests was significantly higher than that of secondary forest and artificial forests.(3)Compared with artificial forest and secondary forest,fine root in natural forest tended to develop into deep soil layers.(4)Forest types and soil layers showed significant influence on the biomass of living fine root.Our results provide the theoretical basis for the conservation and restoration of subtropical forests in this area.
subtropical forestfine root biomassvertical distribution
万方数据
维普
