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秸秆预处理对土壤微生物量及呼吸活性的影响
引用本文:李贵桐,张宝贵,李保国.秸秆预处理对土壤微生物量及呼吸活性的影响[J].应用生态学报,2003,14(12):2225-2228.
作者姓名:李贵桐  张宝贵  李保国
作者单位:中国农业大学资源与环境学院,北京,100094
基金项目:国家重点基础研究发展规划资助项目 (G19990 1170 9)
摘    要:冬小麦秸秆经8.0g·L^-1H2O2(pH11.0)溶液、12.5g·L^-1 NaOH溶液或H2SO4溶液浸泡8h并80℃烘干后,与无机N一起加入土壤,进行室内25℃恒温培养试验,在不同时间测定土壤微生物量C、N和CO2释放速率。结果表明,培养前期,秸秆预处理使土壤微生物量C数量增加了1.0~1.4倍,但降低了土壤微生物的呼吸活性;培养后期,NaOH和H2SO4处理使土壤微生物量C分别下降了28%和42%,但增加了土壤微生物的呼吸活性;H2O2处理则使土壤微生物量N增加90%;土壤微生物区系中的真菌比例在不同时刻有所增加,表明将秸秆预处理后施入土壤,将对土壤中微生物数量和呼吸活性产生一定影响。

关 键 词:秸秆预处理  土壤微生物量  土壤微生物呼吸商
文章编号:1001-9332(2003)12-2225-04
修稿时间:2001年3月29日

Effect of straw pretreatment on soil microbial biomass and respiration activity
LI Guitong,ZHANG Baogui,LI Baoguo.Effect of straw pretreatment on soil microbial biomass and respiration activity[J].Chinese Journal of Applied Ecology,2003,14(12):2225-2228.
Authors:LI Guitong  ZHANG Baogui  LI Baoguo
Institution:College of Resource and Environment, China Agricultural University, Beijing 100094, China. lgtong@mail.cau.edu.cn
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.
Keywords:Straw pretreatment  Soil microbial biomass  Soil microbial respiration activity  
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