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Bulletin of Botanical Research ›› 2018, Vol. 38 ›› Issue (1): 47-55.doi: 10.7525/j.issn.1673-5102.2018.01.006

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Seasonal Changes of the Input of Root Exudates and Its Driving Characteristics of Rhizosphere Microbe in a Cercidiphyllum japonicum Sieb. Plantation

WANG Xiao-Ping, XIAO Xiao, TANG Tian-Wen, LI Yun-Xiang, XIAO Juan   

  1. College of Environmental Science and Engineering, China West Normal University, Nanchong 637000
  • Received:2017-06-09 Online:2018-01-15 Published:2018-01-06
  • Supported by:
    West China Normal University PhD Fund Project(14E009);Youth Fundation Specialization of West China Normal University(14D009)

Abstract: The rhizosphere processes involved in exudate have important ecological effects, but there is very little seasonal changes in situ of plants root exudatuions and their mediated soil biogeochemical cycles, especially endangered rare plant. With 30-year Cercidiphyllum japonicum Sieb.. plantation which is national secondary endangered plants in Dagou in west Sichuan, we used the in situ improved collecting device to study C.japonicum Sieb. root exudates in April, July, September and December 2014, collect rhizosphere and non-rhizosphere soil, and synchronously analyze the changes of rhizosphere microbiological properties. The results showed that:(1)the root secretion of dissolve organic carbon(DOC), total nitrogen(TN) rate appeared remarkable seasonal changes, the highest in summer and lowest in winter. (2)Rhizosphere of microbial biomass carbon(MBC), microbial biomass nitrogen(MBN) was significantly higher non-rhizosphere soil that showed the positive rhizosphere effect. The rhizosphere effect also showed a similar pattern of seasonal dynamics with the input of the root exudates, summer(July) is the highest, while winter(December) is the lowest. (3)By correlation analysis, there was a positive linear correlation between the DOC and TN rates in root exudates, and the rhizosphere effect of MBC, MBN rhizosphere effect and soil enzyme activity implied that the root secretion input was an important factor that could drive the activity of the rhizosphere microorganisms, and reveal the seasonal response of the input of the tree roots to the process and function of the rhizosphere microbial process. Future research should be strengthened in the coupling effect and mechanism about the root secretion input and the process of soil biogeochemical cycle.

Key words: Cercidiphyllum japonicum Sieb. plantation, root exudates, rhizosphere microorganisms, soil enzymes, seasonal changes

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