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Volume 36 Issue 4
Aug.  2017
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Article Navigation >  CARSOLOGICA SINICA  > 2017  >  36(4): 463-469
HE Hongzao, ZHOU Yunchao, ZHANG Chunlai. Root characteristics and carbon accumulation in relation to soils[J]. CARSOLOGICA SINICA, 2017, 36(4): 463-469. doi: 10.11932/karst20170406
Citation: HE Hongzao, ZHOU Yunchao, ZHANG Chunlai. Root characteristics and carbon accumulation in relation to soils[J]. CARSOLOGICA SINICA, 2017, 36(4): 463-469. doi: 10.11932/karst20170406
shu

Root characteristics and carbon accumulation in relation to soils

doi: 10.11932/karst20170406
  • 1.

    Institute for Forest Resources & Environment of Guizhou, Guizhou University/College of Forestry, Guizhou University

  • 2.

    Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics, MLR&GZAR/The International Research Center on Karst under the Auspices of UNESCO

  • Publish Date: 2017-08-25
    Abstract
  • To study the relationship between the input of soil organic carbon and growth of plant root systems in different soils, four kinds of plants, including Broussonetia papyrifera, Myrsine africana, Medicago sativa and Pennisetum sinese, were shifted and cultivated in calcareous and siliceous yellow soils at the cultivation base of Guizhou University in 2011. This place is of subtropical humid monsoon climate, at an altitude of 1,100 m, with an annual average temperature (MAT) of 14.9 ℃ and the annual average precipitation (MAP) of 1,178.3 mm, respectively. The monitoring system (CI-600) was installed in October 2011. For each experimental unit, a plexiglass tube, with a length of 1 meter and diameter of 0.1 meter, was inserted at an angle of 45° down to the ground, with an insert length 65 cm. During the period from January 2014 to December 2014, the root growth characteristics were observed with a plant root scanning system. The resulting data were analyzed with software WINRHIZO TRON 2009a. The dead roots were dug out for the determination of their bulk density, annual dead volume and root carbon density. The results suggest that the root system of Broussonetia papyrifera cultivated in calcareous soil grew better in comparison than that in siliceous yellow soil. It means that the soil organic carbon concentration in the karst mountainous area is larger than that in non-karst area. However, the annual dead roots volume of Medicago sativa cultivated in calcareous soil was larger than that of vegetation species, and its root has the largest contribution to soil carbon sequestration. As an arbor tree species, the root of Broussonetia papyrifera always increased with depth no matter in what soil it was cultivated with. We consider that this should be one of the key reasons why concentrations of soil organic carbon in forest lands are usually higher than those in grass lands at deeper soils. The root system of Broussonetia papyrifera cultivated in calcareous soil developed better in comparison with that of Broussonetia papyrifera cultivated in the sandy clay loam soil. In karst areas, the contributions of plants to soil carbon accumulation follow the order of Medicago sativa> Myrsine africana > Broussonetia papyrifera > Pennisetum sinese. Therefore, it is concluded that the accumulation of soil organic carbon is closely related with growth environments and species of vegetation.

     

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