Dynamic Change of Soil Microbe and Soil Enzyme Activities During Barley Main Growth Stages Under Different Long-term Fertilizer Treatments

doi:10.11924/j.issn.1000-6850.casb16060047

Abstract

Abstract: Soil microbe and soil enzyme activities are closely relative with the fertilizer inputs. Our objective was to explore the dynamic change of soil microbe and soil enzyme activities in paddy soil during barley (Hordaum vulgare L.) main growth stages with different long?term fertilizer managements in the double cropping rice system. we analyzed the soil microbe and soil enzyme activities with mineral fertilizer alone (MF), rice residues plus mineral fertilizer (RF), 30% organic matter and 70% mineral fertilizer (OM1), 60% organic matter and 40% mineral fertilizer (OM2), and without fertilizer (CK) basis on long?term fertilizer experiment. The results showed that different fertilization managements on paddy soil significantly affected some physiological function soil microbial quantityl. The amount of methanogens and methanotrophs in soil with OM2 and OM1 was highest, and was significantly higher than that of MF, RF, CK at the main growth stages of barley. And the amount of nitrifying and denitrification bacteria in soil for different fertilizer managements was OM2>OM1>RF>MF>CK and OM2>OM1>CK>RF>MF at the main growth stages of barley, respectively. Meanwhile, the amount of azotobacteria and ammonifiers in soil for different fertilizer managements was OM1>OM2>RF>MF>CK at the main growth stages of barley, and the amount of cellulose?decomposing bacteria in soil for different fertilizer managements was OM1>MF>OM2>RF>CK at the main growth stages of barley. Meanwhile, the soil enzyme activities were increased by application with fertilizer at the main growth stages of barley. The soil urease activity for different fertilizer managements was RF>OM2>OM1>MF>CK at the main growth stages of barley. The value of soil catalase activity with OM2 was highest, and was significantly higher than that of RF, MF, CK at the main growth stages of barley. The value of soil invertase and soil dehydrogenase activities with OM2 was highest, and was significantly higher than that of CK at the main growth stages of barley. And the value of soil cellobiohyrolase activity with RF was highest, and was significantly higher than that of MF, CK at the main growth stages of barley. As a result, the soil microbe and soil enzyme activities were increased by applied with fertilizer managements, the effect of inorganic fertilizer combined with organic manure is better than that of only inorganic fertilizer.

Xu Yilan,Tang Haiming,Li Yifeng,Xiao Xiaoping,Li Weiyan,Sun Geng and Cheng Kaikai. Dynamic Change of Soil Microbe and Soil Enzyme Activities During Barley Main Growth Stages Under Different Long-term Fertilizer Treatments[J]. Chinese Agricultural Science Bulletin, 2017, 33(13): 12-20.

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