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Volume 7 Issue 1
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Article Navigation >  Forest Research  > 1994 >  7(1): 54-60

Citation:
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A Comparison of Quantitative Tables of Site Quality for Shrubs Established by Two Different Methods

  • 1.

    The Research Institute of Forestry CAF Beijing 100091

  • 2.

    Tianjin University

  • 3.

    The Research Institute of Sand Control in Yulin Prefecture, Shanxi Province

  • 4.

    The Research Institute of Forestry, Ningxia Acadamy of Agriculture

  • Received Date: 1992-06-29
  • Two different methods were used to establish the quantitative tables of site quality for 8 common species of shrubs: Caragana intermedia;Caragana korskinskii; Hedysarum scoparium; Hedysarum laere;Salix spammo-phila; Artemisia ordosica; Artemisia sphaerocephala and Hippophae rhammoides. Weight of biomass of the shrubs was used as an index to establish the tables.The model of quantitative theory (Ⅰ) was used to establish the first table. The second table was established by using the combination of model of quantitative theory (Ⅰ) and model of multiple regression. At first,the quantitative tables of the crown width and shrub height were worked out,then the data was used in the model of multiple regression. Finally, the relative errors were calculated through theoretic values and realistic values.The relative errors of the first table was 10%～19%, while those of the second one 46%～359%.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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A Comparison of Quantitative Tables of Site Quality for Shrubs Established by Two Different Methods

  • 1. The Research Institute of Forestry CAF Beijing 100091
  • 2. Tianjin University
  • 3. The Research Institute of Sand Control in Yulin Prefecture, Shanxi Province
  • 4. The Research Institute of Forestry, Ningxia Acadamy of Agriculture
  • Received Date: 1992-06-29
  • Available Online: 2012-12-04

Abstract: Two different methods were used to establish the quantitative tables of site quality for 8 common species of shrubs: Caragana intermedia;Caragana korskinskii; Hedysarum scoparium; Hedysarum laere;Salix spammo-phila; Artemisia ordosica; Artemisia sphaerocephala and Hippophae rhammoides. Weight of biomass of the shrubs was used as an index to establish the tables.The model of quantitative theory (Ⅰ) was used to establish the first table. The second table was established by using the combination of model of quantitative theory (Ⅰ) and model of multiple regression. At first,the quantitative tables of the crown width and shrub height were worked out,then the data was used in the model of multiple regression. Finally, the relative errors were calculated through theoretic values and realistic values.The relative errors of the first table was 10%～19%, while those of the second one 46%～359%.

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