Effects of different management types on soil nutrients and microbial biomass of Moso bamboo forest

摘要

The spatial variability of soils nutrients and microbial biomass of Moso bamboo forest under different management types was investigated in Jiangxi Province, China in this study and results showed soil nutrients decreased gradually from intensive management (EM to general management (GM) and to extensive management (EM) types. Besides some fluctuations in the concentrations of available K(AK) and total N(TN), soil nutrients in Fengxin country (FXC) turned out to be relatively high while they were relatively low in Tonggu country (TGC). There were extremely significant difference for available N (AN) in 0-1 OEM, 10-30EM in TGC and Yongfeng country (YFC), 30-50EM in TGC, 0-10EM and 30-50EM soil layer of available K(AK) in Jing'an country (JAC). Therewas no spatial effect on TN of 0-10EM in TGC. Interactions were significant among different management types and experimental sites on soil organic matter (SOM) in 0-10 EM, AN and AK in 10-30 EM soil layer. However, there were very significant interactions for SOM in 0-10EM and 10-30EM, AN and AK in 10-30EM. The available P (AP) and TN concentrations were not sensitive to interactions. Bacteria constituted the largest part of soil microbes, followed by actinomycetes and fungi. The amount of bacteria listed from highest to lowest as FXC, TGC, JAC, YFC in the IM and EM, while the sequence was FXC, JAC, YFC and TGC in the GM. The amount of fungi was listed from highest to lowest as in FXC, JAC, TGC and YFC. The amount of actinomycetes of JAC was largest,and was least in FXC. Very significant difference appeared in the amount of actinomycetes with different management types. The correlation was extremely significant of SOC, AN to amount of bacteria and fungi, as well as AP to bacteria, AK to fungi. Therewas little difference among five kinds of soil nutrients to actinomyces.