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Volume 41 Issue 5
Dec.  2022
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Article Navigation >  CARSOLOGICA SINICA  > 2022  >  41(5): 773-783
LAN Jiacheng, WANG Junxian, WANG Shasha, QI Xue, LONG Qixia. Impact of controlling karst rocky desertification on soil particulate organic carbon and aggregate-associated organic carbon[J]. CARSOLOGICA SINICA, 2022, 41(5): 773-783. doi: 10.11932/karst20220509
Citation: LAN Jiacheng, WANG Junxian, WANG Shasha, QI Xue, LONG Qixia. Impact of controlling karst rocky desertification on soil particulate organic carbon and aggregate-associated organic carbon[J]. CARSOLOGICA SINICA, 2022, 41(5): 773-783. doi: 10.11932/karst20220509
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Impact of controlling karst rocky desertification on soil particulate organic carbon and aggregate-associated organic carbon

doi: 10.11932/karst20220509

  • School of Karst Science, Guizhou Normal University/State Engineering Technology for Karst Desertification Control, Guiyang, Guizhou 550001, China

  • Received Date: 2022-01-01
    Abstract
  • The control measures of karst rocky desertification exert important influence on soil organic carbon (SOC) composition, and then affect the accumulation and stability of organic carbon. However, the effects of controlling karst rocky desertification on soil particulate organic carbon (POC), mineral-associated organic carbon (MOC), and their relationship between SOC and aggregate-associated organic carbon are still unclear. Huajiang karst gorge area is one of the most typic demonstration areas of controlling karst rocky desertification in Guizhou Province, Southwest China. Before the 1990s, this area underwent extensive land degradation, which led to the acceleration of SOC emissions. The local people have developed several well-known control measures of rocky desertification, among which we selected two-conversion of cropland to secondary forest and to Zanthoxylum plantation-as study objects. Given cropland as reference, soil was collected in the layers at the depth of 0-20 cm to analyze the impact of the two selected measures on SOC, POC, MOC and aggregate-associated organic carbon as well as their relationship. The results show that compared with cropland, the concentrations of SOC, POC, MOC and aggregate-associated organic carbon at the depth of 0-20 cm increase both in Zanthoxylum plantation and secondary forest. The concentrations of SOC and aggregate-associated organic carbon in secondary forest are significantly higher than those in Zanthoxylumplantation and cropland in the layers at the depth of 0-10 cm (P<0.05), but no significant difference is shown in the layers at the depth of 10-20 cm (P>0.05). The POC concentrations in both segments (0-10 cm and 10-20 cm) significantly increase inZanthoxylum plantation and secondary forest, but the MOC concentrations show no significant changes. POC/SOC ranging from 20.38% to 45.27% is significantly higher in Zanthoxylum plantation and secondary forest than that in cropland ( P<0.05). On the contrary, MOC/SOC in cropland is significantly higher than that inZanthoxylumplantation and secondary forest ( P<0.05). After the conversion of cropland toZanthoxylum plantation and secondary forest, the SOC concentrations have increased mainly due to the increase of POC concentrations. The contribution rate of the particle size bigger than 2 mm to SOC in Zanthoxylum plantation and secondary forest is significantly higher than that in cropland. However, the contribution rate of the particle size between 0.25-2 mm, between 0.053-0.25 mm and smaller than 0.053 mm respectively to SOC is significantly lower than that in cropland. The correlation analysis shows that POC and MOC are positively correlated with SOC and aggregate-associated organic carbon. Their correlations are listed as follows,secondary forest>Zanthoxylum plantation>cropland. After the conversion, the increase of SOC, POC and MOC is significantly correlated with the increase of aggregate-associated organic carbon (P<0.05), with higher correlation in the secondary forest. The control measures of rocky desertification have changed SOC and its physical composition and their relationship, thus promoting the accumulation of organic carbon.

     

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