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Title:: Effects of Different Exogenous Carbon on Soil Respiration,Microbial Biomass Carbon and Enzyme Activity in Degraded Black Soil

Author(s):: MENG Tingting; ZHANG Yufei; MA Yuxuan; ZHOU Sen; WANG Xiaochun; DAI Jianjun; (College of Resources and Environment,Northeast Agricultural University,Harbin,Heilongjiang 150030)

Keywords:: exogenous carbon; degraded black soil; microbial biomass; soil respiration; soil enzyme activity

Abstract:: In order to screen exogenous carbon species that could improved biofertility of degraded black soil,brown sugar,lignite,sodium humate were used in this experiment.Soil incubation experiments were carried out by setting different exogenous carbon into 5 treatments and used PCA(principal component analysis) to screen the best treatment.The treatments include blank control(CK),sugar (T),lignite (H),sodium humate (F) and brown sugar+lignite (TH).The effects of different exogenous carbon on soil respiration,microbial biomass carbon and related enzyme activities in degraded black soil werestudied.The results showed that soil respiration rate and respiration accumulation added four different exogenous carbon in incubation earlier stage showed T>TH>F>H>CK,but laterH,F and T had no significant difference between CK.Soil microbial biomass carbonincreased as T>TH>H>F>CK by adding four kinds of exogenous carbon.Adding exogenous carbon could promote soil enzyme activities.With time changing,the soil enzyme activities in brown sugar treatment were the strongest.Comprehensive score ranking of principal component analysis showed result for T>TH>F>H>CK.Therefore,the exogenous carbon would improve degraded blacksoil microbial activity and biological fertility.Effect of brown sugar treatment (T) was the most significant in the four kinds of exogenous carbon treatments,followed by brown sugar+lignite(TH) treatment.