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Citation:
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Spatial Variations of Soil Organic Carbon and Nitrogen of Forestland in Guandi Mountain

  • 1.

    College of Forestry, Shanxi Agricultural University, Taigu 030801, Shanxi,China

  • Received Date: 2010-08-10
  • Classical statistics and geo-statistics were used to analyze the spatial variations and distribution pattern of soil organic carbon(SOC), total nitrogen(TN) and C/N ratio of forestland in three ecological areas of Pangquangou National Nature Reserve in Guandi Mountain of Shanxi Province,China. The results showed that the SOC and TN increased firstly but fell off afterwards, the C/N decreased continually with the succession level from artificial forest to secondary broad-leaved forest composed of Betula albo-sinensis, Betula platyphylla and Populus davidiana in early phase succession, to secondary Picea, Populus, Betula mixed forest in later stage succession. The coefficient of variation of SOC, TN and C/N varied from 11.74% to 64.71% which showed medium variations. The Range of SOC and TN in artificial forest was larger but still smaller than that in secondary forest, this explained a lower variation degree and more homogeneous spatial distribution of SOC and TN in artificial forest than that in secondary forest. The structural variance ratio of SOC, TN and C/N in artificial forest was in the range of 0－64.8%, which meant a weak or medium spatial autocorrelation, while the structural variance ratio of SOC, TN and C/N in secondary forest was more than 75%, appearing high spatial autocorrelation, and structural variance ratio of the narrated above 3 index showed a increasing trend with progressive succession. Kriged maps showed that SOC, TN and C/N in artificial forest present a high fragmentized distributions but a regular patched distributions. Forest succession, disturbance and toporographic condition have important effects on spatial variation and its characteristics of SOC, TN and C/N of forestland.
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Spatial Variations of Soil Organic Carbon and Nitrogen of Forestland in Guandi Mountain

  • 1. College of Forestry, Shanxi Agricultural University, Taigu 030801, Shanxi,China
  • Received Date: 2010-08-10

Abstract: Classical statistics and geo-statistics were used to analyze the spatial variations and distribution pattern of soil organic carbon(SOC), total nitrogen(TN) and C/N ratio of forestland in three ecological areas of Pangquangou National Nature Reserve in Guandi Mountain of Shanxi Province,China. The results showed that the SOC and TN increased firstly but fell off afterwards, the C/N decreased continually with the succession level from artificial forest to secondary broad-leaved forest composed of Betula albo-sinensis, Betula platyphylla and Populus davidiana in early phase succession, to secondary Picea, Populus, Betula mixed forest in later stage succession. The coefficient of variation of SOC, TN and C/N varied from 11.74% to 64.71% which showed medium variations. The Range of SOC and TN in artificial forest was larger but still smaller than that in secondary forest, this explained a lower variation degree and more homogeneous spatial distribution of SOC and TN in artificial forest than that in secondary forest. The structural variance ratio of SOC, TN and C/N in artificial forest was in the range of 0－64.8%, which meant a weak or medium spatial autocorrelation, while the structural variance ratio of SOC, TN and C/N in secondary forest was more than 75%, appearing high spatial autocorrelation, and structural variance ratio of the narrated above 3 index showed a increasing trend with progressive succession. Kriged maps showed that SOC, TN and C/N in artificial forest present a high fragmentized distributions but a regular patched distributions. Forest succession, disturbance and toporographic condition have important effects on spatial variation and its characteristics of SOC, TN and C/N of forestland.

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