Soil carbon, nitrogen and microbial biomass dynamics of subalpine Abies fabri forest in Gongga Mountain, Southwest China

Feipeng Xiao
2012 African Journal of Microbiology Research  
Soil organic carbon (SOC), soil microbial biomass C, soil total nitrogen (N), NH 4 + -N and NO 3 --N dynamics were measured in subalpine Abies fabri forest at different growth phases which include the mature forest (MF, 3100 m a.s.l.), the middle age forest (MAF, 2998 m a.s.l.) and the succession forest of mixed Abies fabri and Populus purdomii Rehd (SF, 2947 m a.s.l.) of Gongga Mountain, Southwest China. SOC concentrations decreased significantly with increasing depth and at a given depth
more » ... a given depth (0-10 cm, 10-20 cm, 20-40 cm, 40-60 cm and 60-100 cm), SOC was greater in MF than that in MAF and SF. The average SOC concentration in MF (50.99 g kg -1 ) was almost six times than that in MAF (7.97 g kg -1 ) and SF (6.25 g kg -1 ). Soil microbial biomass C fluctuated in time and was higher in August than that in June and October under all A. fabri forests. Soil NH 4 + -N, NO 3 --N and soil available N (NH 4 + -N + NO 3 --N) were higher in MF than those in MAF and in SF. The average soil available N concentrations were 21.61, 12.57 and 10.91 mg kg -1 under MF, MAF and SF, respectively.
doi:10.5897/ajmr12.688 fatcat:gp7mmjqvmbfsrcrgqa3tydc5vu