title: [Effect of straw pretreatment on soil microbial biomass and respiration activity].
abstract: Winter wheat straw particles (0.5 ~ 2.0mm) were soaked with 8.0 g.L-1 H202(pH11.0), 12.5 g.L-1 Na0H or H2S04 solution for  8 h and dried at 80 degreeC.  Soils amended with the pretreated straw and inorganic N were incubated aerobically at 25 degreeC for 60 days.  The C02 emission rate and soil microbial biomass C and N were measured at different time.  The results showed that during the earlier stage of incubation, the pretreatments of straw increased soil microbial biomass C by 1.0 ~ 1.4 folds, but decreased soil microbial respiration activity.  During the  later stage of incubation, the Na0H and H2S04 pretreated straw decreased soil microbial biomass carbon by 28% and 42%, respectively, while increased the soil microbial respiration activity.  The straw pretreated by H202 increased soil microbial biomass nitrogen by 90% after the 15th day of incubation.  The pretreatments of straw increased  the fungi/bacteria ratio at different special time.  It could be concluded that soil microbial biomass and respiration activity could be changed after the pretreated straw was added into the soil.
authors.affiliation: College of Resource and Environment, China Agricultural University, Beijing 100094, China. lgtong@mail.cau.edu.cn
authors.forename: Guitong
authors.initials: G
authors.lastname: Li
authors.forename: Baogui
authors.initials: B
authors.lastname: Zhang
authors.forename: Baoguo
authors.initials: B
authors.lastname: Li
mesh_terms: D018533:Biomass; D002244:Carbon / Q000032:analysis; D005308:Fertilizers; D009584:Nitrogen / Q000032:analysis; D010101:Oxygen Consumption; D012988:Soil Microbiology
chemical_list: D005308:Fertilizers; D002244:Carbon; D009584:Nitrogen