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Distribution of CO 2 in Soil Air Affected by Vegetation in the Shilin National Park
Author(s) -
Linhua SONG,
Fuyuan LIANG
Publication year - 2001
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2001.tb00533.x
Subject(s) - vegetation (pathology) , cypress , national park , atmosphere (unit) , soil water , eucalyptus , environmental science , grassland , hydrology (agriculture) , geology , soil science , agronomy , geography , ecology , medicine , geotechnical engineering , pathology , meteorology , biology , archaeology
This paper studies the CO 2 distribution of soil atmosphere in the Shilin National Park. The measurement sites were chosen according to different topographic features and different vegetations. Seven measurement sites on 3 cross sections were chosen to pass through 3 karstic depressions or on the slopes of depressions. All measurement results show soils with pH values lower than 7.0 (from 5.4 to 6.6). There are 2 cases for the pH values of soil in different topographic features: the pH values of 2 profiles on the ridges or upper slopes of depressions are lower than those in the depressions; and the pH values of 2 soil profiles on the slopes of depressions are higher than those in the depressions. Most samples show relatively low humidity and CO 2 contents on the ridges or slopes of depressions compared with soil profiles in the depressions. High CO 2 contents occur at depths from −40 to −80 cm and high and dense grassland shows high CO 2 contents in the soil atmosphere. Grass roots may grow and are distributed mainly at depths from −20 to −40 cm; while tree roots predominantly as deep as −60 cm even −80 cm. The influences of pine, cypress and eucalyptus on soil CO 2 have been studied. Soil CO 2 influenced by pine and cypress are generally concentrated in an area surrounding the tree with a diameter of 1 m and the strongly influenced distance is 50 cm. Eucalyptus will strongly affect the CO 2 contents in an area with a diameter of 2 m, especially 1 m distant from the tree. The highest concentration of soil CO 2 at a depth of −30 and 100 cm from the tree reaches 92000 ppm.