Soil microbial biomass and its stoichiometry under the eco-landscape forests in Suzhou city
The study aims to evaluate the effects of eco-landscape forest type on the microbial biomass and its stoichiometry at the depth of 0-100 cm soil for generating the basic data of carbon sequestration for the construction and management of urban forestry. The contents of total carbon (TC),total nitrogen (TN),total phosphorus (TP),microbial biomass carbon (MBC),microbial biomass nitrogen (MBN) and microbial biomass phosphorus (MBP) at the depths of 0-20 cm,20-40 cm,40-60 cm,60-80 cm and 80-100 cm were determined under five eco-landscape forests (i.e.,Cinnamomum camphora plantation,Camptotheca acuminata plantation,Metasequoia glyptostroboides plantation,Koelreuteria paniculata plantation and Taxodium distichum var. imbricatum plantation) in Suzhou city. The results showed that:(1) The contents of MBC,MBN,MBP in each soil layer were 447.0-957.1,1.4-56.2 and 1.2-3.3 mg·kg-1,respectively,which were significantly difference among the eco-landscape forests. The MBC and MBN contents at the depth of 0-100 cm soil were highest under Koelreuteria paniculata plantation,and the MBP was highest under Cinnamomum camphora plantation compared with the other eco-landscape forests. (2) The stoichiometric ratio (i.e.,MBC∶MBN,MBC∶MBP,MBN∶MBP),microbial entropy (i.e.,qMBC,qMBN,qMBP),and stoichiometric imbalance were significantly affected by forest type. The MBC∶MBN,MBC∶MBP and qMBC were higher in the soil of coniferous forest,but the MBN∶MBP,qMBN,qMBP and stoichiometric im-balance were higher in the soil of broad-leaved forest. (3) The microbial biomass and its stoichiometry were signifi-cantly correlated with bulk density,total carbon,total nitrogen and total phosphorus in the soil of the eco-landscape forests. The soil microbial biomass and its stoichiometry were significantly affected by the eco-landscape forest type. Compared with the coniferous forests,the broad-leaved forests had the higher MBN,MBP and stoichiometric im-balance in the soil,indicating that the soil microbial biomass of the broad-leaved forest was more susceptibly affect-ed by the total nitrogen and total phosphorus in the soil of the eco-landscape forests.
万方数据
维普
