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首页> 外文期刊>Applied Soil Ecology >Soil microbial DNA concentration is a powerful indicator for estimating soil microbial biomass C and N across arid and semi-arid regions in northern China
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Soil microbial DNA concentration is a powerful indicator for estimating soil microbial biomass C and N across arid and semi-arid regions in northern China

机译：土壤微生物DNA浓度是一种强大的指标，用于估算中国北方干旱和半干旱地区的土壤微生物生物量C和N.

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摘要

Soil microbes exert critical control over ecosystem functions by regulating organic matter decomposition and nutrient cycling. Diverse methods have been adopted to estimate the soil microbial biomass carbon (C-mic) and nitrogen (N-mic), largely based on fumigation and respiration or biomarkers, such as phospholipids and ATP. Although soil microbial DNA is also an important biomarker, whether this biomarker can be used to estimate C-mic and N-mic at a large scale in arid and semi-arid regions that remains unclear. To explore this, the 124 soil samples collected from 28 different vegetation/microhabitat types in diverse ecosystems (i.e., desert, cropland, typical steppe, meadow steppe and forest) across arid and semi-arid regions in northern China; then, the strong linear relationships were developed among soil microbial DNA concentrations with the C-mic and N-mic contents estimated by the classic chloroform fumigation-extraction (CFE) method. The results showed that the soil microbial DNA concentrations were linearly related to the observed C-mic (r = 0.99) and N-mic (r = 0.97) across the diverse vegetation types, although soil microbial biomass presented an enormous fluctuation. Moreover, based on the above-mentioned coefficients of the linear relationship, it was further inferred that the mean proportions of carbon and nitrogen elements in DNA were 0.99% and 3.70% for C-mic and N-mic, respectively, when assuming the G-C base-pair proportion is 50% in double-stranded DNA. In conclusion, the study proved that soil microbial DNA as a powerful indicator may provide convenient and efficient estimates for C-mic and N-mic in arid and semiarid systems. Although this method still needs to be further improved and examined at a larger scale, it provides a good addition to the already existing methods to determine microbial biomass.
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  • 来源
    《Applied Soil Ecology》 |2021年第1期|共8页
  • 作者

    Gong Haiyang; Du Qiajun; Xie Shubin; Hu Weigang; Akram Muhammad Adnan; Hou Qingqing; Dong Longwei; Sun Ying; Manan Abdul; Deng Yan; Ran Jinzhi; Deng Jianming;

  • 作者单位

    Lanzhou Univ Sch Life Sci State Key Lab Grassland Agroecosyst 222 South Tianshui Rd Lanzhou 730000 Peoples R China;

    Lanzhou Univ Sch Life Sci State Key Lab Grassland Agroecosyst 222 South Tianshui Rd Lanzhou 730000 Peoples R China;

    Lanzhou Univ Sch Life Sci State Key Lab Grassland Agroecosyst 222 South Tianshui Rd Lanzhou 730000 Peoples R China;

    Lanzhou Univ Sch Life Sci State Key Lab Grassland Agroecosyst 222 South Tianshui Rd Lanzhou 730000 Peoples R China;

    Lanzhou Univ Sch Life Sci State Key Lab Grassland Agroecosyst 222 South Tianshui Rd Lanzhou 730000 Peoples R China;

    Lanzhou Univ Sch Life Sci State Key Lab Grassland Agroecosyst 222 South Tianshui Rd Lanzhou 730000 Peoples R China;

    Lanzhou Univ Sch Life Sci State Key Lab Grassland Agroecosyst 222 South Tianshui Rd Lanzhou 730000 Peoples R China;

    Lanzhou Univ Sch Life Sci State Key Lab Grassland Agroecosyst 222 South Tianshui Rd Lanzhou 730000 Peoples R China;

    Lanzhou Univ Sch Life Sci State Key Lab Grassland Agroecosyst 222 South Tianshui Rd Lanzhou 730000 Peoples R China;

    Lanzhou Univ Sch Life Sci State Key Lab Grassland Agroecosyst 222 South Tianshui Rd Lanzhou 730000 Peoples R China;

    Lanzhou Univ Sch Life Sci State Key Lab Grassland Agroecosyst 222 South Tianshui Rd Lanzhou 730000 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 土壤生态学;
  • 关键词

    Microbial biomass; Soil DNA; Vegetation/microhabitat types; Fumigation methods; GC content;

    机译：微生物生物量;土壤DNA;植被/微巢型类型;熏蒸方法;GC含量;

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