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《Acta Botanica Boreali-Occidentalia Sinica》 2017-07
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The Soil Fungi Community Metabolic Characteristics and Influence Factors in Rhizosphere Soils of Populuseuphratica

WANG Wenjuan;LI Jingwen;WANG Zhongbin;QU Laiye;The Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing Forestry University;Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
Soil fungi community play a significant role in many key ecosystem processes,such as litter decomposition and nutrient cycling.The biodiversity and activities of soil fungi are also very important for evaluating the ecosystem health.It is significant to study metabolic characteristics of fungi community and underlying environmental correlates in rhizosphere soils of Populuseuphraticafor the protection of arid ecosystem,considering the important status of the species in that harsh environment areas.In our study,we collected 89 soil samples from typical P.euphraticaforest to explore the metabolic characteristics of fungi community and underlying environmental factors.The results showed that(1)Carbon sources used by fungi could be grouped into 3clusters based on OD value.About 53.8% of amino acids could be included into clusterⅠ(OD:0.106 1-0.316 4),83.3% amines and 70% miscellaneous into cluster Ⅱ(OD:0.016 6-0.224 2),47.1% of carboxylic acids into clusterⅢ(OD:0.232 1-1.115 5).(2)Redundancy analysis(RDA)indicated that the total variances explained by soil factors was 30.02%,and RDA1 which was markedly correlated with electric conductivity and available potassium could explain 84.6% of its variances.(3)Samples at RDA2 axis were gradually dispersed with the decrease of salt,which may suggest soil fertility and soil texture may be the secondary important factor in determining the metabolic characteristics of fungi community.In conclusion,the dominant carbon sources used by fungi community in P.euphraticarhizosphere were amino acids,carboxylic acids,and some of carbohydrates,while weaker utilization intensities of amines and miscellaneous.Soil soluble salt,especially for the available potassium,was the most significant soil factor influencing the metabolic characteristics of fungi community.Soil fertility and soil texture were the secondary factors,only significantly correlated with metabolic characteristics of soil fungi community when the soil soluble salt content was low
【Key Words】: Populus euphratica rhizosphere soil fungi community metabolic characteristics soil factors
【Fund】: 国家自然科学基金(31570610)
【CateGory Index】: S714.3
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