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Scientia Silvae Sinicae ›› 2017, Vol. 53 ›› Issue (3): 21-32.doi: 10.11707/j.1001-7488.20170303

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Profile of Soil Microbial Community under Different Stand Types in Qinghai Province

Zi Hongbiao1, Xiang Zeyu1, Wang Genxu2, Ade Luji1, Wang Changting1   

  1. 1. College of Life Science and Technology, Southwest University for Nationalities Chengdu 610041;
    2. Institute of Mountain Hazards and Environment, CAS Chengdu 610041
  • Received:2015-10-03 Revised:2017-01-19 Online:2017-03-25 Published:2017-04-25

Abstract: [Objective] Seven natural stand types were investigated to understand the soil microbial community. The main forest species were Picea crassifolia, Betula platyphylla, Larix gmelinii, Populus davidiana. The purpose of this study was to improve management and evaluation strategies of the forest by adjusting the structure and restoring the degraded forest.[Method] The 7 stand types were Datong Picea crassifolia (A), Datong Betula platyphylla (B), Huangzhong Picea crassifolia+Betula platyphylla (C), Ledu Larix gmelinii+Betula platyphylla (D), Minhe Populus davidiana (E), Xunhua Populus davidiana+Betula platyphylla (F),and Jianzha Picea crassifolia (G) in Qinghai Province. The soil physical-chemical properties and soil microbial community composition were investigated by conventional laboratory analysis and phospholipid fatty acids (PLFAs) analysis. Changes of individual PLFA signatures and correlations between soil properties and soil microbial group of PLFA indicators were analyzed by principal components analysis (PCA) and redundancy analysis (RDA), respectively.[Result] A total of 17 different PLFAs with different types of biomarkers were detected in the soil samples among different stand types. The stand types A and B exhibited a larger number PLFAs compared with other stand types. The lowest number of PLFAs was found in stand type G. The PLFAs biomarker was variable in different stand soils. The highest content was 16:0. The highest richness of PLFAs was saturated fatty acid. The highest total content of PLFAs biomarkers was found in stand B, and the lowest in stand G. The contents of bacteria and fungus PLFAs displayed the following order:broad-leaved stand > mixed broadleaf-conifer stand > conifer stand. The Simpson index, Shannon-Wiener index of stands F and G were significantly lower than those of the other stand types. McIntosh index were holistically higher in stand types A, B and D than in the other types. Principal Component Analysis (PCA) showed that generalized bacteria and Gram positive bacteria were the main soil microbial group. Redundancy analysis (RDA) indicated that the effects of pH, soil moisture and fine root biomass on soil microbial community were higher than those of soil organic carbon, bulk density and litter standing crop.[Conclusion] Soil microbial community composition and impact factors were significantly different among different stand types. Therefore, the management and utilization of forest ecosystem should consider the change of soil microbial community characteristics, in order to improve forest management practices.

Key words: phospholipid fatty acids (PLFAs), microbial community, stand type, soil organic carbon, Qinghai Province

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