Pedosphere 7(1): 1--8, 1997
ISSN 1002-0160/CN 32-1315/P
©1997 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Acidity regimes of soils under different vegetations in the Changbai Mountains region
YU Tian-Ren1, GAO Zi-Qin2, SHANG Zhao-Cong2 and DAI Li-Min3
1 Institute of Soil Science, Academic Sinica, Nanjing 210008 (China)
2 Institute of Applied Ecology, Academia Sinica, Shengyang 110015 (China)
3 The Research Station of Changbai Mountain Forest Ecosystems, Academia Sinica (China)
      The acidity regimes of representative soils on the north slope of the Changbai Mountains were examined through determinations of pH and pCa of the soil paste as well as in-situ determinations. For soils under broad-leaf forest or broad-leaf-Korean pine forest, the pH decreased from the litter to lower layers gradually until it did not change or decreased further slightly. For soils under coniferous forest or Ermans birch forest, there was a minimum in pH at a depth of 3~6 cm where the content of humus was high. The pCa increased gradually from the soil surface downward to a constant value. The lime potential (pH-0.5pCa) showed a similar trend as the pH in its distribution. For a given soil, the measured pH value of the thick paste, ranging from 4.5 to 5.5, was lower by about 0.5 units than the value determined by the conventional method with a water to soil ratio of 5:1. The pH determined in situ was even lower. It was found that there was a fairly close relationship between soil acidity and the type of vegetation. The pH showed a trend of decreasing from soils under broad-leaf forest through broad-leaf-conifer mixed forest and coniferous forest to Ermans birch forest, and the pCa showed an opposite trend in variation.
Key Words:  Changbai Mountains, lime potential, pCa, soil acidity, soil pH
Citation: Yu, T. R., Gao, Z. Q., Shang, Z. C. and Dai, L. M. 1997. Acidity regimes of soils under different vegetations in the Changbai Mountains region. Pedosphere. 7(1): 1-8.
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