Soil microbial community diversity under four vegetation types in the Qilian Mountains, China

doi:10.11686/cyxb2014272

Abstract

Abstract: Soil microbes are an important component of soil ecosystem playing a key role in nutrient and energy cycling. The variation of soil microbial community diversity under cushion plants, alpine meadow, swamp meadow and alpine shrub along an elevation gradient in mid the altitude zone of the Qilian Mountains was measured using the BIOLOG-ECO technique.The results showed that the soil microbial activity assessed using well color development (AWCD) varied in the order: swamp meadow>alpine meadow>alpine shrub>cushion plants. Soil microbial communities in swamp meadow had the highest soil microbial activity; the carbon source utilization mode of soil microbial communities was similar under alpine meadow and swamp meadow. Correlation analysis indicated that the Shannon-Wiener index (H) was significantly correlated (P<0.05) with soil organic carbon and total nitrogen. Simpson’s (D) and Mclntosh’s (U) indices were significantly (P<0.05) correlated with soil total nitrogen. Redundancy analysis (RDA) on microbial communities constrained by different soil factors showed that soil organic carbon, soil pH and total soil nitrogen were important factors determining the rate of metabolism of carbon substrates in soils. The results of this study suggested a basis for further investigation of the relationships between vegetation diversity and soil microbial community diversity.

ZHU Ping, CHEN Ren-Sheng, SONG Yao-Xuan, LIU Guang-Xiu, CHEN Tuo, ZHANG Wei. Soil microbial community diversity under four vegetation types in the Qilian Mountains, China[J]. Acta Prataculturae Sinica, 2015, 24(6): 75-84.

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