植物研究2018，Vol.38Issue(1)：47-55,9.DOI:10.7525/j.issn.1673-5102.2018.01.006
连香树人工林根系分泌物输入季节性变化及其驱动的根际微生物特性研究
Seasonal Changes of the Input of Root Exudates and Its Driving Characteristics of Rhizosphere Microbe in a Cercidiphyllum japonicum Sieb.Plantation
摘要
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 nonrhizosphere 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.关键词
连香树人工林/根系分泌物/根际微生物/土壤酶活性/季节变化Key words
Cercidiphyllum japonicum Sieb.plantation/root exudates/rhizosphere microorganisms/soil enzymes/seasonal changes分类
农业科技引用本文复制引用
王小平,肖肖,唐天文,黎云祥,肖娟..连香树人工林根系分泌物输入季节性变化及其驱动的根际微生物特性研究[J].植物研究,2018,38(1):47-55,9.基金项目
West China Normal University PhD Fund Project(14E009) （14E009）
Youth Fundation Specialization of West China Normal University (14D009)西华师范大学博士启动基金项目(14E009) （14D009）
西华师范大学青年资助专项(14D009) （14D009）
