Abstract:
To analyze the characteristic of soil nutrients and microbial biomass carbon and nitrogen in different soil layers after thinning and removing for one year,
Picea asperata forest of giant panda corridor was chosen. Compared with the non-thinning forest, the total nutrients of the thinning forest decreased, but the effective nutrients increased, and the soil microbial carbon and nitrogen also increased, after thinning, TOC, TN and TP in topsoil decreased by 20.65%, 20.73% and 75.72%, while NN, AN, AK and AP increased by 40.70%, 13.26%, 37.20% and 43.30%, MBC, MBN, qMBC and qMBN increased by 27.23%, 25.24%, 42.42% and 28.93% respectively, the results are similar to the subsurface soil; The C/P and N/P of the topsoil layer increased significantly, while the C/N and MBC/MBN of the sub-topsoil layer decreased significantly; MBC and MBN are positively correlated with available nutrients, MBC is not correlated with TN, TOC, and MBC/MBN is correlated with TN, TOC, AN, AK, C/N showed a significant negative correlation. Thinning improved the soil available nutrients and microbial biomass, however, it may lead to insufficient soil organic matter of the
P.
asperata forest. It is necessary to strengthen the compensation effect of
P.
asperata forest, especially the under-story, by applying organic matters in the following measures.