Biological Resources

Spatial Patterns of Soil Microbial Biomass Carbon and Factors Influencing the Distribution in a Typical Desert Ecosystem

  • GUAN Hai-ying ,
  • ZHAO Xin ,
  • JIN Jia ,
  • ZHANG Si-nan ,
  • XU Lu
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  • 1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2014-05-07

  Revised date: 2014-07-08

  Online published: 2014-11-25

Abstract

Soil microbes, as main decomposers in desert ecosystems, play an important role in the carbon (C) cycle in arid lands. Using the geostatistical spatial autocorrelation method, this study explored the spatial distribution patterns of the surface soil microbial biomass carbon in a selected Tamarix chinensis desert ecosystem, a typical desert ecosystem and further analyzed the environmental factors affected the distribution. The results showed that the microbial biomass C varied from 14.1-1 178.6 μg·g-1 in the selected ecosystem, which was far more less than in the other ecosystem. The distribution presented as the higher the vegetation density, the larger the soil microbial biomass C. The soil microbial biomass exhibited a positive global spatial autocorrelation with its environmental factors and the local spatial autocorrelation Moran’s I indexes varied from -0.2 to 0.5. The soil microbial biomass had a positive and significant relationship (P<0.05) with soil moisture and soil temperature, with spatial correlation coefficients of 0.56 and 0.64, respectively. The results suggested that soil microbes in the desert ecosystem scale shows strong spatial heterogeneity and its distribution at 10 m level was heavily affected by vegetation density, soil moisture and soil temperature. This study would be in help to improve the understanding of the spatial distribution of soil carbon in arid lands and to define a finer spatial autocorrelation pixel scale accordingly.

Cite this article

GUAN Hai-ying , ZHAO Xin , JIN Jia , ZHANG Si-nan , XU Lu . Spatial Patterns of Soil Microbial Biomass Carbon and Factors Influencing the Distribution in a Typical Desert Ecosystem[J]. Arid Zone Research, 2014 , 31(6) : 1125 -1131 . DOI: 10.13866/j.azr.2014.06.22

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