Effects of fungal addition on dune plant litter decomposition in Horqin Sandy Land, northern China
Results/Conclusions The result showed that no strain litter decomposed at about 30% of the rate of all strains, while single strains were intermediate, not significantly different between single strains. Surface showed about half the rate of buried, and there were major rate differences between litters; grass-derived litters showed the highest rates. The results were analyzed in relating to climate using ICBM (Introductory Carbon Balance Model) soil carbon model. Two rate-controlling factors (kY, initial decomposition constant and h, humification quotient) were fitted to the decomposition data. Factors kY an h were adjusted to the different litter species. Treatment effects were described by a common rate multiplier resulting in surface decomposition rates 0.45 of those in buried; no strain was 0.3 and single strains all were 0.8 of those with all strains. Fungal addition could accelerate litter decomposition in degraded sand dune ecosystem. Manipulation of the magnitude and diversity of the decomposer community in sand dune soils can change thus change soil process rates, and rate differences may be described by simple, multiplicative factors.
Key words: Litter decomposition; cellulose decomposing fungi; ICBM model; Inner Mongolia