The Effect of Biochar on Soil Enzyme Activity and Microbial Community Structure in the Soil under Autotoxicity Stress

doi:10.7668/hbnxb.2015.04.037

Abstract

Abstract: The experiment was to provide basis for prevention of suppressive cropping problems of tomato.Taking indoor cultivation,used lime nitrogen,carbonized maize cob and rice husk to study their effects on the quantity of microorganisms and enzyme activities in the soil amended with autotoxicity.The results obtained were listed as follows.Decomposition of tomato leaf contained some kinds of phenolic acids such as phthalic acid,tannic acid and vanillic acid.Compared with the control group,autotoxic chemicals increased the polyphenol oxidase activity and decreased the activity of urase,acid phosphatase and proteinase.Bacterial numbers decreased while fungi increased.Adding lime nitrogen could not relieve the effect of autotoxic chemicals on enzyme activities in the soil.It decreased the quantity of bacterial and fungi.But B/F was increased.When 2.5% carbonized maize cob and rice husk was added into the soil treated with decomposition of tomato leaf,they had promoting effect on enzyme activities and bacterial numbers.The quantity of soil fungi and the ratios of B/F were decreased.They relieved the toxic effect of autotoxic chemicals.Compared with rice husk,the carbonized maize cob had a more obvious effect.

Key words: Biochar, Decomposition, Autotoxic chemicals, Soil enzyme activities, Soil micro-organism

CLC Number:

S154

LI Liang-liang, WU Zheng-chao, CHEN Bin, LIU Wen-e, ZANG Jian. The Effect of Biochar on Soil Enzyme Activity and Microbial Community Structure in the Soil under Autotoxicity Stress[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(4): 219-225. doi: 10.7668/hbnxb.2015.04.037.

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