Characteristics of vegetation and soil microorganisms of molehill grassland in an ecologically vulnerable alpine region

doi:10.11686/cyxb20140525

Abstract

Abstract:

In order to better define the soil dynamics of the black beach soil, in grassland dynamics and provide theory and techniques for grassland restoration informed by microbiology, we researched the soil of molehills in an ecologically vulnerable alpine region of Tianzhu County, Gansu Province. We detected and analyzed the microbial population of 3 main categories of soil microorganisms (fungi, bacteria and actinomycetes) and the bacteria groups involved in nitrogen transformation (ammonifiers, nitrifiers, denitrifying bacteria, aerobic and anaerobic nitrogen fixing bacteria). Taxa were cataloged by soil depth and season of sample collection using plate colony count and MPN methods. In addition, the above-ground plant biomass and total Soil N content were investigated by regular methods. Key results are: the dominant species in molehill grassland was Microula sikkimensis, the vegetation coverage and above-ground plant biomass was low. The seasonal dynamic of microbial population was well defined. The maximum number of taxa of fungi, bacteria, actinomycetes and N-transforming bacteria was observed in the 0-20 cm soil layer in August, and the minimum in the 20-40 cm layer in April, except for the ammonifier and aerobic N-fixing soil bacteria for which the number was observed in October. There was a positive correlation between both soil N and plant biomass and the microbial population of nitrifiers and aerobic N-fixing bacteria. By contrast, there was a negative correlation between soil N and denitrifying bacteria.

CLC Number:

S812.2

LU Hu,LI Xian-gang,YAO Tuo,PU Xiao-peng. Characteristics of vegetation and soil microorganisms of molehill grassland in an ecologically vulnerable alpine region[J]. Acta Prataculturae Sinica, 2014, 23(5): 214-222.

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