Study of microorganism abundance and communities in response to soil factors in Binggou Valley, the upper reaches of Heihe

doi:10.11686/cyxb2018106

Abstract

Abstract: In order to study changes in bacteria abundance and communities in response to soil factors in Binggou Valley, the upper reaches of Heihe, we collected 10 surface soil samples at different altitudes and analyzed the culturable microorganisms’ abundance and the soils’ physico-chemical properties. The results showed that soil nutrients vary markedly by altitude. High concentrations of soil organic carbon (SOC), total N and P, nitrate N, ammonium N and available P were found at high altitudes, while the concentrations of total K and available K were high at low altitudes. The abundance and diversity of culturable microorganisms vary markedly according to vegetation types and degree of cover. The abundance of phosphorus bacteria and fungi are significantly positively related to total N and P (P<0.05). Bacillus is significantly positively related to pH (P<0.05). The comprehensive evaluation of soil composition at different altitudes showed that the most fertile soil is located at 3479 m altitude, the second most fertile at 3204 m, followed by 2911 and 3172 m. Analysis of surface soil composition showed that phosphorus bacteria, potassium bacteria and silicate bacterium are the dominant strains. Analysis of the main components of microorganisms showed the most significant diversity in samples taken at 3205 m altitude. These results indicate that soil nutrients and microorganism abundance in the Binggou valley are mainly influenced by altitude, vegetation types and degree of cover.

Key words: ice valley, altitude gradient, soil microorganism, soil nutrient

GAO Hai-ning, LI Cai-xia, SUN Xiao-mei, CHEN Nian-lai, ZHANG Yong. Study of microorganism abundance and communities in response to soil factors in Binggou Valley, the upper reaches of Heihe[J]. Acta Prataculturae Sinica, 2018, 27(6): 23-33.

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