Effect of straw pretreatment on soil microbial biomass and respiration activity

Abstract

Abstract: Winter wheat straw particles (0.5～2.0 mm) were soaked with 8.0 g·L^-1 H2O₂ (pH11.0),12.5 g·L^-1 NaOHor H2SO4 solution for 8 h and dried at 80 ℃. Soils amended with the pretreated straw and inorganic Nwere incubated aerobically at 25 ℃ for 60 days. The CO₂ emission rate and soil microbial biomass Cand Nwere measured at different time. The results showed that during the earlier stage of incubation,the pretreatments of straw increased soil microbial biomass Cby 1.0～1.4 folds,but decreased soil microbial respiration activity. During the later stage of incubation,the NaOHand H2SO4 pretreated straw decreased soil microbial biomass carbon by 28% and 42%,respectively,while increased the soil microbial respiration activity. The straw pretreated by H2O₂ 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.

CLC Number:

S15.36

LI Guitong, ZHANG Baogui, LI Baoguo . Effect of straw pretreatment on soil microbial biomass and respiration activity[J]. Chinese Journal of Applied Ecology, 2003, (12): 2225-2228.

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